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181	Material Physics	ABS-171
Overview of Transparent Conducting Electrodes for Hybrid Perovskite Solar Cells Tanti Dewinggih(a*), Reza Farel Ramdhani(a) a) Department of physics, UIN Sunan Gunung Djati, Jalan AH Nasution No.105, Bandung 40614, Indonesia *dewinggih.tanti[at]uinsgd.ac.id Abstract Transparent conducting electrodes (TCEs) are incomparable class of materials that have outstanding optical transmission of electromagnetic wave in the visible light spectrum combined with very high conductivity at room temperature. They are required components in optoelectronic devices, such as solar cells, touch screen and displays. TCEs are essential for light transmission, collection and transport of charge carriers in photovoltaics. TCM act crucial role in hybrid Perovskite Solar Cells (PSCs), influencing their stability, efficiency and cost-effectiveness. The most popular used TCEs are transparent conducting oxides (TCOs), such as indium tin oxide (ITO) and fluorine-doped tin oxide (FTO), but alternatives are being explored to address issues related to cost, flexibility, and material scarcity. Graphene and carbon nanotubes (CNTs) are material alternatives as Carbon-based TCEs. In this article will explore the fundamental optical and electrical properties of TCEs, highlight the challenges, innovations and potential future research directions. Keywords: Keywords: transparent conductive materials, transparent conducting electrodes, hybrid perovskite solar cells, photovoltaics, transparent conductive oxide, graphene, carbon nanotubes, silver nanowires, TCO-free. Share Link | Plain Format | Corresponding Author (Tanti Dewinggih)

182	Material Physics	ABS-173
Effect Milling Time on the Phase Formation and Magnetic Properties of Co0.75Ni0.25Ti0.975Y0.025O3 Sintered at 1000 C Sample Abstract Tesalonika Siregar (a,b), Yunasfi (b), Mashadi (b), Wisnu Ari Adi (b), Budhy Kurniawan (a*), Jan Setiawan (b*) a) Departement of Physics, Universitas Indonesia, Depok 16424, Indonesia b)Research Center for Advanced Material-National Research and Innovation Agency (BRIN), Complex Puspiptek Building 440-442, Tangerang South, Banten 15314, Indonesia * budhy.kurniawan[at]sci.ui.ac.id, *jans002[at]brin.go.id Abstract This study investigates the effect of milling time on the phase formation and magnetic properties of Co0.75Ni0.25Ti0.975Y0.025O3 (CNTYO) synthesized via a solid-state reaction method and sintered at 1000 C. Stoichiometric amounts of Co3O4, NiO, TiO2, and Y2O3 powders were mixed and milled using High Energy Milling at 1000 rpm for 1, 3, 5, and 7 hours. X-ray diffraction (XRD) analysis revealed that a single-phase trigonal structure was fully formed after 5 hours of milling, while Y2O3 residues were still detected at 3 hours. Lattice parameter analysis confirmed structural stability with slight variations in unit cell volume and microstrain. Crystallite size calculated using the Williamson-Hall method decreased from 1021 nm (1 hour) to 862 nm (7 hours), accompanied by a reduction in microstrain from 9.5 x 10^-4 to 8.1 x 10^-4. Scanning Electron Microscopy (SEM) observations supported these findings, showing decreased grain size and improved homogeneity with prolonged milling time. The correlation between XRD, WH plot, and SEM results indicates that extended milling enhances densification and structural refinement. Magnetic measurements using a Vibrating Sample Magnetometer (VSM) demonstrated a decrease in saturation magnetization (Ms) from 0.569 emu/g to 0.541 emu/g and a reduction in coercivity (Hc) from 0.0103 Oe to 0.0020 Oe with increasing milling time. These reductions are attributed to weakened magnetic domain interactions caused by crystallite refinement and increased grain boundary area, which hinder domain wall movement. Overall, a milling time of 5 hours provides an optimal balance between phase formation, crystal structure stability, microstructural refinement, and controlled magnetic behavior. Keywords: High energy milling- Phase Formation- Williamson-Hall method- Microstructure- Magnetic properties Share Link | Plain Format | Corresponding Author (Tesalonika Siregar)

183	Material Physics	ABS-176
Fabrication of Electrospun Nanofibers Polyvinyl Alcohol Incorporated by Clove Leaves Extract Maulika Nur Hasanah (a), Abdullah Hanif Al Azzam (a), Hendri Widiyandari (b), Fitri Yola Amandita (c), Akmal Zulfi (c), Yulianto Agung Rezeki (a*) a) Department of Physics Education, Faculty of Teacher Training and Education, Universitas Sebelas Maret, Surakarta 57126, Indonesia b) Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Sebelas Maret, Surakarta 57126, Indonesia c) Research Center for Environmental and Clean Technology, National Research and Innovation Agency (BRIN), Bandung 40135, Indonesia *yarezeki[at]staff.uns.ac.id Abstract Clove (Syzygium aromaticum L.) leaves are rich in bioactive compounds, especially eugenol, which exhibit strong antioxidant, anti-inflammatory, and antibacterial properties. Despite their valuable bioactive properties, clove leaves have received less attention, with most utilization of the plant focused on its flower buds. This study aims to fabricate polyvinyl alcohol (PVA) nanofibers incorporated with clove leaves extract (CLE) using electrospinning technique and evaluate its potential as an antioxidant agent. Various ratio between PVA and CLE solution were conducted to investigate their effects on fibers morphology, functional groups, crystallinity, and antioxidant activity of PVA/CLE nanofibers. SEM images analysis confirmed that lower ratio of PVA solution led to an increase in the average fibers diameter. FTIR analysis showed that the PVA/CLE nanofibers exhibited similar characteristic functional groups to those of pure CLE, indicating the successful incorporation of the CLE into the nanofiber matrices. In addition, XRD analysis showed that decreasing PVA solution ratio resulted in a decrease in nanofiber crystallinity. The antioxidant activity, evaluated using DPPH test, showed very strong antioxidant activity with an IC50 values of 0.8 to 47.5 ppm. Based on these findings, PVA/CLE nanofibers are considered promising for biomedical applications, particularly as a drug delivery system due to their bioavailability, biocompatibility, drug loading capacity, and free radical scavenging ability. Keywords: Antioxidant- Clove leaves extract- Electrospinning- Nanofibers- Polyvinyl alcohol Share Link | Plain Format | Corresponding Author (Maulika Nur Hasanah)

184	Material Physics	ABS-179
Mechanical and Oxidation Properties of Ni-TiN Composite Coatings Esmar Budi, Afrizal, Md. Nizam Abd Rahman Pendidikan Fisika FMIPA Universitas Negeri Jakarta Abstract The influence of pulse current density on the mechanical and oxidation properties of Ni-TiN composite coating was studied. The composite coatings were deposited by using electrodeposition technique with varying pulse current density of 0,4 mA/mm2, 0,6 mA/mm2, dan 0,8 mA/mm2. Microwave-induced heating process was used as a novel approach to investigate the oxidation behaviour of the composite coatings. The surface morphology and composition of the coatings were characterized by using Scanning Electron Microscopy (SEM) and Energy Dispersive Spectroscopy, respectively while the coating hardness was tested by using Vickers microhardness test. The effect of microwave-induced heating on the mechanical and oxidation behaviour of composite coating is discussed. Keywords: Composite, coating, microwave, heating, oxidation Share Link | Plain Format | Corresponding Author (Esmar Budi)

185	Material Physics	ABS-181
Influence of Cr3C2-NiCr Coating Thickness on Corrosion Behavior of Carbon Steel in Alkali Chloride Atmospheres Safitry Ramandhany (a,b*), Djoko Triyono (a*), Eni Sugiarti (b*), Hubby Izzuddin (b), Agus Sukarto Wismogroho (b), Ahmad Afandi (b), Jayadi (b), Wahyu Bambang Widayatno (b), Nurul Latifah (b), Kurotun Aini (b) a) Department of Physics, Faculty of Mathematics and Natural Science, Universitas Indonesia, Depok 16424, Indonesia *safitry.ramandhany41[at]ui.ac.id, djoko.triyono[at]sci.ui.ac.id b) Research Center for Advanced Materials, National Research and Innovation Agency (BRIN), Serpong 15314, Indonesia *enis006[at]brin.go.id Abstract The development of protective coatings against alkali-induced high-temperature corrosion is critical for extending the service life of components in aggressive environments such as boiler co-firing biomass. This study investigated the influence of Cr3C2-NiCr coating thickness on the corrosion performance of A516 carbon steel substrates exposed to alkali chloride vapor (NaCl + 55wt% KCl) at 600C for 100 hours. Coatings with approximate thicknesses of 150um and 20um were deposited via High Velocity Oxy Fuel (HVOF) spraying, using Cr3C2-NiCr as the coating material. Their degradation behaviors were evaluated through mass change measurements, corrosion rate analysis, and detailed microstructural characterization using field emission-scanning electron microscopy (FE-SEM) equipped with electron dispersive spectroscopy (EDS), X-Ray Diffraction (XRD), and surface hardness testing. The thicker coating exhibited a significantly lower corrosion rate (0.1495mm/y during the first 20 hours) than the thinner coating, which experienced rapid degradation and visible spallation after 40 hours. XRD analysis revealed that the surface of the thicker coating was dominated by Cr2O3 and NiCr2O4. In contrast, the thinner coating formed a more complex oxide mixture consisting of Cr2O3, Fe3O4, Fe2O3, and NiCr2O4, indicating a severe corrosion attack to the thinner coating and substrate. The underlying mechanisms of alkali salt vapor corrosion for both coating thicknesses are explained in this paper, offering understanding into microstructural of Cr3C2-NiCr coating on A516 carbon steel in corrosive high-temperature environments. Keywords: alkali, Cr3C2-NiCr, corrosion, mechanisms, thickness Share Link | Plain Format | Corresponding Author (Safitry Ramandhany)

186	Material Physics	ABS-182
The influence of Mg Substitution at A and B-Sites on the Structural and Optical Properties of LaFeO3 Perovskites Nova Nur Elisa Dewi(a*), Rahma Maulidia(a), Djoko Triyono(b**), Rifqi Almusawi(b), Iwan Sugihartono(a***) (a) Program Studi Fisika, FMIPA, Universitas Negeri Jakarta, Jl. Rawamangun Muka, Rawamangun 13220, Indonesia *nova.elisad[at]gmail.com- **iwan-sugihartono[at]unj.ac.id (b) Department of Physics, FMIPA, Universitas Indonesia, Kampus Baru UI, Depok 16424, Indonesia **djoko.triyono[at]sci.ui.ac.id Abstract Abstract. LaFeO&#8323- with 0.1 Mg substitution at the A-site (La0.9Mg0.1FeO3) and B-site (LaFe0.9Mg0.1O3) has been successfully synthesized via the sol-gel method. The crystal structure, morphology, and optical properties of La0.9Mg0.1FeO3 and LaFe0.9Mg0.1O3 powders were characterized by X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), and Ultraviolet-Visible (UV-Vis) Spectroscopy, respectively. Based on the Inorganic Crystal Structure Database (ICSD) No. 98-002-8255, the XRD patterns of both samples possess an orthorhombic structure with Pnma space group. Optically, substituting Mg at both A and B-sites influences the absorbance and reflectance in the wavelength range of 350-800 nm. Moreover, by the Tauc Plot, we have determined the optical band gap of La0.9Mg0.1FeO3 and LaFe0.9Mg0.1O3, which are 1.88 eV and 1.61 eV, respectively. Keywords: LaFeO&#8323-, Mg substitution, A-site and B-site substitution, optical band gap, sol-gel method, perovskite structure Share Link | Plain Format | Corresponding Author (Nova Nur Elisa Dewi)

187	Material Physics	ABS-183
The influence of Mg Substitution at A and B-Sites on the Structural and Optical Properties of LaFeO3 Perovskites Nova Nur Elisa Dewi(a*), Rahma Maulidia(a), Djoko Triyono(b**), Rifqi Almusawi(b), Iwan Sugihartono(a***) (a) Program Studi Fisika, FMIPA, Universitas Negeri Jakarta, Jl. Rawamangun Muka, Rawamangun 13220, Indonesia *nova.elisad[at]gmail.com- ***iwan-sugihartono[at]unj.ac.id (b) Department of Physics, FMIPA, Universitas Indonesia, Kampus Baru UI, Depok 16424, Indonesia **djoko.triyono[at]sci.ui.ac.id Abstract LaFeO3 with 0.1 Mg substitution at the A-site (La0.9Mg0.1FeO3) and B-site (LaFe0.9Mg0.1O3) has been successfully synthesized via the sol-gel method. The crystal structure, morphology, and optical properties of La0.9Mg0.1FeO3 and LaFe0.9Mg0.1O3 powders were characterized by X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM), and Ultraviolet-Visible (UV-Vis) Spectroscopy, respectively. Based on the Inorganic Crystal Structure Database (ICSD) No. 98-002-8255, the XRD patterns of both samples possess an orthorhombic structure with Pnma space group. Optically, substituting Mg at both A and B-sites influences the absorbance and reflectance in the wavelength range of 350-800 nm. Moreover, by the Tauc Plot, we have determined the optical band gap of La0.9Mg0.1FeO3 and LaFe0.9Mg0.1O3, which are 1.88 eV and 1.61 eV, respectively. Keywords: LaFeO3, Mg substitution, A-site and B-site substitution, optical band gap, sol-gel method, perovskite structure Share Link | Plain Format | Corresponding Author (Iwan Sugihartono)

188	Material Physics	ABS-184
Nanopartikel Emas (Au): Sintesis dan Uji Sifat Absorbansi pada Temperatur Ruang Laelatul Dalilah(a*), Nadia Istiqomah(a), Nur Indah Puspita(a), Affi Nur Hidayah(b**), Iwan Sugihartono(a***) (a) Program Studi Fisika, FMIPA, Universitas Negeri Jakarta, Jl. Rawamangun Muka, Rawamangun, Jakarta Timur 13220, Indonesia *laelatuldalilah05[at]gmail.com- ***iwan-sugihartono[at]unj.ac.id (b) Pusat Riset Fotonika, BRIN, Kawasan Sains dan Teknologi B.J. Habibie, Tangerang Selatan, Banten 15314, Indonesia **affi001[at]brin.go.id Abstract Penelitian ini bertujuan untuk mensintesis nanopartikel emas (Au) menggunakan metode one-step synthesis dengan memanfaatkan sinar UV untuk mereduksi ion HAuCl4 dalam larutan HEPES yang berperan sebagai agen reduksi. Proses sintesis nanopartikel emas dilakukan menggunakan cawan petri dengan dua variasi konsentrasi HAuCl4, masing-masing 0.0026 M dan 0.0001 M, sedangkan konsentrasi HEPES 0.1 M. Setelah itu, sampel disinari dengan sinar UV di dalam rak 1, 2, dan 3 UV chamber selama 10 menit. Karakterisasi dilakukan menggunakan spektrofotometer UV-Vis untuk mendapatkan spektrum absorbansi serta panjang gelombang (wavelength). Hasil sintesis HAuCl4 dengan konsentrasi 0.0026 M menunjukkan warna ungu kemerahan, menandakan pembentukan nanopartikel emas (AuNP). Sementara pada konsentrasi 0.0001 M, larutan tetap bening transparan tanpa rona kemerahan, menandakan hampir tidak ada pembentukan partikel emas. Hasil spektrum UV-Vis mengkonfirmasi bahwa pada sampel 0.0026 M menunjukkan puncak SPR pada rentang 530-540 nm. Sedangkan pada sampel dengan konsentrasi 0.0001 M tidak menunjukkan adanya puncak SPR. Keywords: HAuCl4, Emas, Nanopartikel, UV-Vis, HEPES Share Link | Plain Format | Corresponding Author (Laelatul Dalilah)

189	Material Physics	ABS-185
Microstructure, Hardness, and Corrosion Resistance Analysis of Cu-40Zn-xSn Prepared by Gravity Die Casting Process Imam Basori, Fachrul Rozy, Agung Premono Department of Mechanical Engineering, Faculty of Enginnering, Universitas Negeri Jakarta Abstract Brass is an alloy consisting of a mixture of copper and zinc. In this study, the type of brass used is naval brass with a Cu content of 60% and Zn of 40%. Naval brass has good strength and good corrosion resistance. Naval brass applications are usually used in the manufacture of marine equipment such as ship propellers. However, naval brass is included in copper alloys that easily react, dissolve, and corrode in seawater conditions. Corrosion that occurs in brass alloys is called dezincification. Dezincification can be avoided by adding elements, one of which can be used is tin (Sn). This study was conducted to determine the effect of adding tin (Sn) on the microstructure, hardness, and corrosion resistance of Cu-40Zn brass alloys. For sample preparation, the gravity die casting process was carried out with variations in the addition of Sn elements, starting from 0 wt.% Sn, 0.5 wt.% Sn, 1 wt.% Sn, and 1.5 wt.% Sn. After that, the casting results will be homogenized at a temperature of 800&#8451- for 2 hours. After being homogenized, the samples were cut for several tests, namely composition testing, microstructure observation, hardness testing, and corrosion testing. From the results of the research conducted, the addition of Sn elements can affect the microstructure, because the addition of Sn elements encourages the formation of the &#946- phase. The results of the hardness test showed an increase in the hardness value along with the addition of Sn elements, namely 134.22 VHN, 151.64 VHN, and 162.1 VHN. Further, it can be concluded that the addition of Sn elements can increase the hardness value of brass alloys. In the corrosion test, the corrosion rate values were obtained at 0.3354 mmpy, 0.1956 mmpy, and 0.2362 mmpy along with the addition of Sn elements. Finally, it can be concluded that the addition of Sn elements affects the corrosion resistance of brass alloys. Keywords: Brass, Dezincification, Microstructure, Hardness, Corrosion Resistance Share Link | Plain Format | Corresponding Author (IMAM BASORI)

190	Material Physics	ABS-189
Impact of post heat treatment on the Crystallinity of hydroxyapatite Synthesized from Limestone and the adhesion of various Gram Positive and Gram Negative Bacteria Evi Ulina Margareta Situmorang1,2, Heri Sutanto3, Parsaoran Siahaan4, Nyoman Jujur5, Giri Wahyu Alam5, Daniel edbert6, Ferry Budhi Susetyo7, Nendar Herdianto5, Widodo Widjaja Basuki8, Yustinus Dimas Gianni Prabowo8 1 Doctoral Degree Mathematics and Science, Mathematics and Science Faculty, Universitas Diponegoro, 50275, Indonesia 2Department of Physiology School of Medicine and Health Sciences, Atma Jaya Catholic University of Indonesia, 14440, Indonesia 3Department of Physics, Universitas Diponegoro, 50275, Indonesia 4Department of Chemistry, Universitas Diponegoro, 50275, Indonesia 5Research Center for Advanced Materials-National Research and Innovation Agency, 15314, Indonesia 6Department of Microbiology, Atma Jaya Catholic University of Indonesia, 14440, Indonesia 7Department of Mechanical Engineering, Universitas Negeri Jakarta, 13220, Indonesia 8Department of Mechanical Engineering, Atma Jaya Catholic University of Indonesia, 14440, Indonesia Abstract The study investigates the impact of post-heat treatment on the structural properties of hydroxyapatite (HA) and its effect on bacterial adhesion, specifically against Escherichia coli and Staphylococcus aureus. Hydroxyapatite was synthesized via a hydrothermal method using natural limestone as the calcium source. The samples were calcined at 700C, 900C, and 1100C for 1 hour. Comprehensive characterization was conducted using X-ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FTIR), and Scanning Electron Microscopy (SEM). The results showed that near-stoichiometric and highly crystalline HA was obtained at 900&#61616-C. Higher calcination temperatures resulted in increased grain size and significant surface morphological changes. These surface modifications altered the interfacial characteristics of HA, which significantly reduce affects the adhesion of both E. coli and S. aureus. The study demonstrates that post-heat treatment not only improves the crystallinity of HA but also performance of hydroxyapatite for biomedical applications. Keywords: Hydroxyapetite, heat treatment, bacteria adhesion, material characteritationPlease Just Try to Submit This Sample Abstract Share Link | Plain Format | Corresponding Author (Evi Ulina Margareta Situmorang)

191	Material Physics	ABS-195
Intrinsic and Extrinsic Spin Hall Conductivity of BaPb_{0.75}Bi_{0.25}O_{3} Ansell Alvarez Anderson [a*], Anugrah Azhar [b,c], Adam Badra Cahaya [a], Muhammad Aziz Majidi [a] [a] Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Indonesia, Depok 16424, Indonesia *ansell.alvarez[at]sci.ui.ac.id [b] Department of Physics and Astronomy, The University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom [c] Physics Study Program, Faculty of Science and Technology, Syarif Hidayatullah State Islamic University Jakarta, Tangerang Selatan 15412, Indonesia Abstract Charge-to-spin conversion is an important physical property in the spintronics field. One of the physical phenomena that provides charge-to-spin is the spin Hall effect. A quantity that determines the spin Hall effect is the spin Hall conductivity which can be obtained from the material^s intrinsic Berry curvature and impurity scatterings. In this work, we aim to obtain the spin Hall conductivity of \(BaPbO_{3}\) (BPO) and one of its Bi-doped version of crystal \(BaPb_{0.75}Bi_{0.25}O_{3}\) (BPBO) by using density functional theory with the relativistic effect considered and Wannier function calculations. We find the sum of BPBO intrinsic spin Hall conductivity from our computational calculation and extrinsic spin Hall conductivity from contributions of impurity skew scattering and side jump to be \(5.74 \cdot 10^{3} \frac{\hbar}{2e} \frac{S}{m}\) where the extrinsic contribution dominates the intrinsic contribution. Keywords: Density functional theory- Spin Hall conductivity- Berry curvature Share Link | Plain Format | Corresponding Author (Ansell Alvarez Anderson)

192	Material Physics	ABS-198
Morphological, Crystal Characterization, and Magneto-Thermal of Superparamagnetic Iron Oxide Nanoparticles (SPION) from Natural Sand based Coprecipitation Sono-Chemical Kormil Saputra 1,4, Wida Puteri Agista 2,3, Indrawan Eka Badri 1, Teguh Ardianto 1, Dian W. Kurniawidi 1, Masruroh Masruroh 4,*, Didik Rahadi Santoso 4 Ahmad Taufiq 2 1 Physics Study Program, Universitas Mataram, Jl. Majapahit No.62, Gomong, Kec. Selaparang, Mataram, Nusa Tenggara Barat. 83115, Indonesia 2 Physics Department, Universitas Negeri Malang, Jl. Cakrawala No.5, Sumbersari, Lowokwaru District, Malang City, East Java, Indonesia 3 Tinta Emas Institute, Jl. Sultan Salahuddin No.23, Sekarbela District, Mataram, Nusa Tenggara Barat, 83115, Indonesia 4 Physics Department, Brawijaya University, Jl. Veteran No.10-11, Ketawanggede, Lowokwaru District, Malang City, East Java, 65145, Indonesia Abstract Superparamagnetic Iron Oxide Nanoparticles (SPION) have been widely studied for biomedical applications, especially in the field of imaging and cancer therapy. However, studies on the magneto-thermal characteristics of SPION synthesized from natural sources such as iron sand are still limited, especially related to the heating efficiency in an alternating magnetic field. This study has successfully synthesized magnetite-based SPION from natural sand using a sonochemical coprecipitation method, combined with polyaniline and activated carbon to improve magneto-thermal performance. The characterization results using SEM showed nanoparticle morphology with a size between 103.32-121.23 nm. FTIR analysis confirmed the presence of Fe-O functional groups in tetrahedral and octahedral positions, as well as the presence of hydroxyl groups. XRD showed a crystalline structure of magnetite with a crystallite size of 22.6 nm based on the Scherrer method and Rietveld analysis. The UV-Vis spectrum shows two characteristic absorption peaks and a direct band gap value of 2.10 eV and an indirect band gap of 3.24 eV. Magneto-thermal testing shows a temperature increase of up to 13oC under the influence of an alternating magnetic field, indicating the great potential of this material in cancer hyperthermia therapy applications. Keywords: SPION- Iron Sand- Sono-Chemical Coprecipitation- Magneto-Thermal Share Link | Plain Format | Corresponding Author (Kormil Saputra)

193	Material Physics	ABS-199
Comparative Study of Electrochemical CO2 Reduction Using Electrodes made of Metal Nanoparticles deposited on a Metal Substrate Vita Efelina1*, Kirana Qulsum3, Aulia Defitri Wulandari2, Muhammad Asharuddin2, Alvin Fariz1, Herman2, Fitrilawati3, and Rahmat Hidayat2* 1 Doctoral Program in Physics, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jl. Ganesha 10, Bandung 40132, West Java, Indonesia 2 Physics of Magnetism and Photonics Research Division, Faculty of Mathematics and Natural Sciences, Bandung Institute of Technology, Jl. Ganesha 10, Bandung 40132, West Java, Indonesia 3 Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Jalan Raya Bandung-Sumedang, Km 21 Jatinangor, Sumedang, West Java 45363, Indonesia Abstract Electrochemical reduction of carbon dioxide (CO2RR) is one of the straightforward methods to convert CO2 into valuable products or fuels while simultaneously reducing greenhouse gas emissions. Integration with solar or other renewable energy electricity may offer a promising pathway to a sustainable fuel economy. However, CO2RR occurs simultaneously with other reduction reactions, particularly the hydrogen evolution reaction (HER), which decreases the efficiency of CO2RR. In this presentation, we will report the investigation results on several electrodes made of metal nanoparticles deposited on a metal substrate for CO2RR. The Sn, Ni, and Cu nanoparticles were electrodeposited onto five different types of metal substrates, namely Cu, Sn, Ni, Zn, and stainless steel. CO2RR was carried out in 0.25 M KHCO3 electrolyte solution. The electrochemical performance of the electrodes was evaluated using cyclic voltammetry (CV) in a CO2-free and CO2-saturated electrolyte solution. The measurement results showed different electrocatalytic properties and CO2RR depending on the electrode, which is related to the suppression of the dominant HER reaction. The electrodes made of the combination of Cu and Sn showed a remarkable CO2RR current density in the CO2 saturated electrolyte solution, suggesting increased CO2RR activity. On the contrary, electrodes composed of Ni tended to promote more HER. These findings emphasise the crucial importance of selecting an appropriate electrode made of metal nanoparticles deposited on a metal substrate to improve the efficiency of CO2RR. Keywords: CO2 electroreduction, CO2RR, cyclic voltammetry, hydrogen evolution reaction, metal nanoparticles. Share Link | Plain Format | Corresponding Author (Vita Efelina)

194	Material Physics	ABS-200
Structural and Electronic Properties of Manganese-Doped Superparamagnetic Iron Oxide Nanoparticles Derived from Natural Iron Sand Kormil Saputra 1,4, Wida Puteri Agista 2,3, Sofiana Aprilia 1, Teguh Ardianto 1, Dian W. Kurniawidi 1, Masruroh Masruroh *4, Didik Rahadi Santoso 4 Ahmad Taufiq 2 1 Physics Study Program, Universitas Mataram, Jl. Majapahit No.62, Gomong, Kec. Selaparang, Mataram, Nusa Tenggara Barat. 83115, Indonesia 2 Physics Department, Universitas Negeri Malang, Jl. Cakrawala No.5, Sumbersari, Lowokwaru District, Malang City, East Java, Indonesia 3 Tinta Emas Institute, Jl. Sultan Salahuddin No.23, Sekarbela District, Mataram, Nusa Tenggara Barat, 83115, Indonesia 4 Physics Department, Brawijaya University, Jl. Veteran No.10-11, Ketawanggede, Lowokwaru District, Malang City, East Java, 65145, Indonesia Abstract The development of functional materials based on metal oxides is increasing along with the need for advanced materials for technological, environmental, and medical applications. Indonesia, especially West Nusa Tenggara, has great potential in utilizing iron sand as a natural source of magnetic minerals such as superparamagnetic Iron Oxide Nanoparticles (SPION). This study has successfully synthesized SPION (MF1) and manganese-doped Fe3O4 (Mn0.25Fe2.75O4/MF2) materials from local iron sand using a modified coprecipitation method. The synthesis process involves magnetic separation, dissolution with HCl, precipitation using NH4OH, and doping with MnCl3. Characterization using XRD, FTIR, and UV-Vis shows that both materials have a cubic spinel structure with significant changes in lattice parameters and crystallite size after Mn doping. FTIR spectrum confirmed the presence of O-H, C-O, Fe-O, and Mn-O functional groups, while UV-Vis results showed a decrease in the gap energy from 3.11 eV to 3.07 eV and a decrease in the Urbach energy from 0.131 eV to 0.074 eV. These findings indicate that Mn substitution successfully improves the crystallinity quality and modifies the electronic properties of Fe3O4, thus potentially being applied in the fields of photocatalysis and optoelectronics. Keywords: SPION- Manganese Doping- Iron Sand- Energy Gap- Crystal Structure Share Link | Plain Format | Corresponding Author (Kormil Saputra)

195	Material Physics	ABS-203
Analisis Pengaruh Variasi Konsentrasi Dopan ZnO, FeO, MnO, dan MgO Terhadap Sifat Optik Sistem Kaca P2O5-CaO serta Perbandingan dengan Sistem Kaca P2O5-Cangkang Telur Haifany (a*), Eka Laela Nun Karina (a), Zahra Sajidah Hariyawan (a), Haryanto (a), Selsa Sururiyah Sya^baniyah (a), Agus Setyo Budi (a**), Anggara Budi Susila (a***), Hadi Nasbey (a****) (a) Program Studi Fisika, FMIPA, Universitas Negeri Jakarta, Jl. Rawamangun Muka, Rawamangun 13220, Indonesia *haifahaidar65[at]gmail.com Abstract Fosfat Pentaoksida (P2O5) merupakan bahan pembentuk kaca yang banyak diteliti selama satu dekade terakhir karena memiliki sifat fisik unggul, seperti suhu transisi rendah, koefisien pemuaian termal tinggi, dan konduktivitas listrik baik. Penambahan dopan logam oksida seperti ZnO, FeO, MnO, dan MgO dapat memodifikasi struktur jaringan kaca serta meningkatkan sifat optiknya. CaO sebagai komponen modifier berperan penting dalam menurunkan titik lebur dan memperkuat jaringan kaca. Sumber CaO konvensional dapat digantikan oleh limbah cangkang telur yang mengandung kalsium karbonat, sehingga menjadi alternatif bahan baku yang lebih ekonomis dan ramah lingkungan. Penelitian ini bertujuan untuk menganalisis pengaruh variasi konsentrasi dopan ZnO, FeO, MnO, dan MgO terhadap sifat optik sistem kaca P2O5-CaO serta membandingkannya dengan sistem kaca P2O5-cangkang telur. Sintesis kaca dilakukan dengan metode melt-quenching. Karakterisasi sifat optik menggunakan spektrofotometri UV-Vis, sedangkan analisis morfologi dan komposisi unsur menggunakan SEM-EDX. Hasil SEM-EDX menunjukkan keberadaan unsur O dan P sebagai komponen utama, serta Ca dari CaO murni maupun cangkang telur. Dopan yang digunakan juga terdeteksi, menunjukkan pencampuran bahan yang merata melalui proses milling. Keywords: Kaca Fosfat, Logam Oksida, Kalsium Oksida, Cangkang Telur, Sifat Optik Share Link | Plain Format | Corresponding Author (Haifany Haifany)

196	Material Physics	ABS-212
Effect of Holding Time on the Phase Formation and Microstructure of Mullite Synthesized at 1200C Destia Nurika (a*), Budhy Kurniawan (a*), Muhamad Ikhlasul Amal (b*), Agus Sukarto Wismogroho (b) a) Department of Physics, University of Indonesia, Depok Indonesia *destia.nurika[at]ui.ac.id *budhy.kurniawan[at]sci.ui.ac.id b) Research Center for Advanced Materials National Research and Innovation Agency (BRIN), South Tangerang Indonesia *muha089[at]brin.go.id agus109[at]brin.go.id Abstract Mullite is a crucial ceramic material known for its excellent thermal and mechanical stability making it a promising candidate for high temperature applications. This study aims to evaluate the effect of holding time variation on the phase formation and microstructural evolution of mullite synthesized at 1200C. The precursor powders were sintered for 2 4 and 6 hours and the samples were characterized using X ray Diffraction XRD and Scanning Electron Microscopy SEM. XRD analysis revealed that the holding time variation had no significant effect on the diffraction patterns indicating that mullite phase formation occurred consistently from the earliest holding time of 2 hours. However SEM observations of the 2 hour sample showed coarse and inhomogeneous particle morphology suggesting incomplete crystal growth. These results indicate that while the mullite phase forms early during sintering the refinement and development of the microstructure are still influenced by the duration of heat treatment. Keywords: Mullite- Holding time- Microstructure morphology Share Link | Plain Format | Corresponding Author (Destia Nurika)

197	Material Physics	ABS-215
ZIF-8 modified with N-doped Carbon Dots using the direct mixing method at room temperature Aniza Salviana Prayugo(a), Marpongahtun(b*), Saharman Gea(b), and Heri Sutanto(c) a)Postgraduate Program of Chemistry, Faculty of Mathematics and Natural Science, Universitas Sumatera Utara, Medan, 20155, Indonesia b)Department of Chemistry, Faculty of Mathematics and Natural Science, Universitas Sumatera Utara, Medan, 20155, Indonesia *marpongahtun[at]usu.ac.id c)Department of Physics, Faculty of Science and Mathematics, Universitas Diponegoro, Jawa Tengah, 50275, Indonesia Abstract Modification of ZIF-8 with N-CDs through the direct mixing method at room temperature was successfully carried out. XRD confirmed the formation of the N-CDs crystal structure with ZIF-8, characterized by an amorphous peak at 24.83. SEM showed heterogeneous particles with an average diameter of 14 &#956-m. EDX confirmed the composition of C (34.82%), N (37.25%), O (12.60%), and Zn (14.90%), confirming that the samples contained the precursor components utilized. These findings prove N-CDs can be used as a modifier of ZIF-8 without damaging its basic structure, although their abundance affects the material^s morphology. Keywords: ZIF-8, N-CDs, Direct mixing method, Metal-organic frameworks (MOFs), Morphological modification Share Link | Plain Format | Corresponding Author (Aniza Salviana Prayugo)

198	Material Physics	ABS-216
Abstract to Test as Participant from Committee Riser Fahdiran Fisika UNJ Abstract Abstract to Test as Participant from Committee. Abstract to Test as Participant from Committee. Abstract to Test as Participant from Committee. Abstract to Test as Participant from Committee. Abstract to Test as Participant from Committee. Abstract to Test as Participant from Committee. Abstract to Test as Participant from Committee. Abstract to Test as Participant from Committee. Abstract to Test as Participant from Committee. Abstract to Test as Participant from Committee. Abstract to Test as Participant from Committee. Abstract to Test as Participant from Committee. Abstract to Test as Participant from Committee. Keywords: Committee- Commiitte- IPS- 2025- UNJ Share Link | Plain Format | Corresponding Author (Riser Fahdiran)

199	Material Physics	ABS-217
Analysis Pore Volume and Compressive Strength of Fly Ash and Perlite Concrete Geopolymer at 900 Degree Celcius F M Farida T Bambang A K V T Fauziastuti and M F Fikri Universitas Negeri Jakarta Abstract Burned material experiences a decrease in yield strength and elasticity modulus In this study five compositions of fly ash and perlite-based concrete geopolymer have been burned for 900 degree celcius for 2 hours The volume of pore decreases for both unburned and burned concrete geopolymer One of the strength of concrete geopolymer indicator is compressive strength Both of the results of compressive strength and the pore size are conducted through experimental study Bet method has been used to measure pore volume of it UTM machine has been used to calculate compressive strength It is found that there is a decline trend of pore volume and is the same trend with compressive strength of five compositions of fly ash and perlite-based concrete geopolymer Keywords: geopolymer compressive strength pore volume passive fire protection Share Link | Plain Format | Corresponding Author (Fransisca Maria Farida)

200	Material Physics	ABS-222
Structure-Property Relationship in Ce-Doped ZnO for Photocatalytic Applications under UV Light Mediniah Putri Simatupang(a), Ari Sulistyo Rini(a*), Erwin(a), Lazuardi Umar(a), Tengku Emrinaldi(a), and Erman Taer(a) a) Department of Physics, Faculty of Mathematics and Environmental Science, University of Riau, Pekanbaru, 28192, Riau, Indonesia *ari.sulistyo[at]lecturer.unri.ac.id Abstract Zinc oxide (ZnO)-based photocatalysts are promising materials for environmental remediation. However, their efficiency can be further enhanced through structural modification. In this study, nanostructured ZnO was engineered via cerium (Ce) doping at concentrations of 0%, 1%, and 2% using a green, microwave-assisted biosynthesis method with Pandanus amaryllifolius leaf extract. Characterization results confirmed that Ce doping successfully narrowed the band gap, reduced crystallite size, and produced uniform nanoflower-like morphologies. Among the samples, 1% Ce-doped ZnO exhibited the highest photocatalytic activity, achieving a degradation efficiency of 98.46% for methyl orange under UV light irradiation. This improvement is attributed to the electron-trapping ability of Ce ions, which suppresses electron-hole recombination and enhances the generation of reactive oxygen species. These findings suggest that Ce-doped ZnO synthesized through a sustainable route offers a highly efficient photocatalyst for UV-driven wastewater treatment. Keywords: ZnO- cerium doping- photocatalyst- methyl orange- Pandanus amaryllifolius Share Link | Plain Format | Corresponding Author (Ari Sulistyo Rini)

201	Material Physics	ABS-228
Optimizing Lightweight Lattice Structures via Unit Cell Size and Subdivision for Efficient Additive Manufacturing of Complex Surface Parts Ahmad Mohamad Fahmi, Gandjar Kiswanto, Ahmad Kholil Department of Mechanical Engineering, Faculty of Engineering, Universitas Indonesia, Depok, Indonesia Abstract In additive manufacturing, designing lightweight lattice structures with low density is critical for reducing material usage and print time. This study investigates the effects of initial unit cell size and subdivision levels on lattice density and computational efficiency during lattice embedding in parts with complex, contoured surfaces. Using a single lattice topology, multiple combinations of base sizes and subdivision depths were evaluated to identify configurations that minimize density while ensuring rapid computation and manufacturability. Results demonstrate that larger base unit cells combined with limited subdivision achieve significantly reduced lattice density and faster processing times compared to smaller unit cells without subdivision, even in challenging surface geometries. These findings provide practical guidelines for designing lightweight lattice parts optimized for 3D printing in complex surface applications. Future work will explore mechanical performance validation. Keywords: Additive Manufacturing, Lattice Structure, Adaptive Voxel Modeling Share Link | Plain Format | Corresponding Author (Ahmad Mohammad Fahmi)

202	Material Physics	ABS-233
ANALISIS CELAH ENERGI OPTIK NANOROD ZnO YANG DITUMBUHKAN PADA Zn FOIL MENGGUNAKAN TEKNIK HIDROTERMAL Anindita Prameswari Safitri(a*), Adinda Salsabila Khansa(a), Nurfina Yudasari(b**), Iwan Sugihartono(a***) a) Program Studi Fisika, FMIPA, Universitas Negeri Jakarta, Jl. Rawamangun Muka, Rawamangun, Jakarta Timur 13220, Indonesia *safitrianindita03[at]gmail.com- ***iwan-sugihartono[at]unj.ac.id b) Pusat Riset Fotonika, BRIN, Kawasan Sains dan Teknologi B.J. Habibie, Tangerang Selatan, Banten 15314, Indonesia Abstract Sintesis nanorod ZnO telah berhasil dilakukan menggunakan teknik hidrotermal pada substrat Zn foil. Proses sintesis dilakukan pada suhu 95\( ^\circ \)C dengan variasi waktu pertumbuhan selama 4, 8, 12, 16, 20, dan 24 jam. Sampel hasil sintesis dikarakterisasi menggunakan spektrofotometer UV-Vis untuk memperoleh data reflektansi difusi. Berdasarkan perhitungan menggunakan metode Kubelka-Munk dan plot Tauc, nilai celah energi nanorod ZnO berada pada rentang 3.16-3.19 eV. Celah energi terbesar dimiliki sampel 4 dan 20 jam (3.19 eV), sedangkan sampel lainnya menunjukkan nilai konstan sebesar 3.16 eV. Hal ini mengindikasikan bahwa struktur optik ZnO relatif stabil pada durasi pertumbuhan 8-24 jam. Sehingga, variasi waktu hidrotermal mempengaruhi ketebalan, morfologi permukaan, dan distribusi defek alamiah yang berimplikasi pada sifat optik nanorod ZnO. Keywords: ZnO, Nanorod, Hidrotermal, Kubelka-Munk, Band Gap , Sifat optiky to Submit This Sample Abstract Share Link | Plain Format | Corresponding Author (Anindita Safitri)

203	Material Physics	ABS-236
Analisis Perbandingan Kekuatan Tarik Pada Material HRPO, CRCA dan Galvanis Menggunakan Alat UTM (Universal Testing Machine) Aulia Rahmah(a*), Esmar Budi(b), Famie Qifatiana(b) Program Studi Fisika, Fakultas Matematika dan ILmu Pengetahuan Alam, Universitas Negeri Jakarta. Jl. Rawamangun Muka Raya No.11, Jakarta Timur, Daerah Khusus Ibukota Jakarta 13220. *aaarahmah25[at]gmail.com Abstract Metode pengujian yang digunakan dalam penelitian ini adalah uji tarik menggunakan Universal Testing Machine (UTM). Pengujian ini dilakukan untuk mengetahui parameter kekuatan tarik seperti tegangan maksimum, regangan, dan modulus elastisitas dari masing-masing material. Data yang diperoleh kemudian dianalisis dan dibandingkan untuk menentukan material yang memiliki karakteristik terbaik dalam aplikasi tertentu. Hasil pengujian menunjukkan bahwa setiap material memiliki sifat mekanik yang berbeda berdasarkan proses produksinya. HRPO (Hot Rolled Pickled and Oiled) cenderung memiliki kekuatan tarik lebih rendah dibandingkan CRCA (Cold Rolled Close Annealed) dan Galvanis. CRCA menunjukkan kekuatan tarik yang lebih tinggi dibandingkan HRPO karena memiliki ukuran butir yang kecil, sehingga semakin kecil ukuran butir suatu material, maka semakin tinggi kuat tariknya. Sementara itu, material Galvanis memiliki keunggulan dalam ketahanan terhadap korosi, meskipun kekuatan tariknya bisa bervariasi tergantung pada ketebalan lapisan pelindungnya. Hasil pengujian menunjukkan bahwa CRCA memiliki kekuatan tarik tertinggi, diikuti oleh Galvanis dan HRPO. Namun, HRPO memiliki regangan atau daktilitas yang lebih baik. Galvanis, meskipun tidak setinggi CRCA dalam kekuatan tarik, memiliki keunggulan dalam ketahanan terhadap korosi, menjadikannya pilihan ideal untuk aplikasi luar ruangan. Kesimpulannya, pemilihan material sangat tergantung pada kebutuhan aplikasi, apakah lebih menekankan kekuatan, daktilitas, atau ketahanan terhadap lingkungan. Dengan adanya penelitian ini, diharapkan dapat memberikan wawasan lebih mendalam mengenai sifat mekanik material HRPO, CRCA, dan Galvanis serta membantu dalam menentukan pemilihan material yang tepat untuk berbagai aplikasi industri. Keywords: Uji Tarik, Universal Testing Machine (UTM), HRPO (Hot Rolled Pickled and Oiled), CRCA (Cold Rolled Close Annealed), Galvanis Share Link | Plain Format | Corresponding Author (Aulia Rahmah)

204	Material Physics	ABS-243
Tinjauan Spesifikasi Material dan Desain Struktural pada Proyek Perbaikan Jembatan Pipa Gas 8 Inci Ruas Mundu-Sunyaragi di PT Pertamina Gas Operation West Java Area Ezalicha Fatya Jasmine (a*), Syafrima Wahyu (b), Valdi Sina Ilman (b) a) Universitas Negeri Jakarta Jl. Rawamangun Muka, RT.11/RW14, Rawamangun, Pulo Gadung, Jakarta Timur, Daerah Khusus Jakarta, 13320 *ezalichafajas[at]gmail.com b) PT Pertamina Gas Grha Pertamina, Pertamax Tower, Lantai 20 - 23 Jl. Medan Merdeka Timur No. 11-13 Jakarta Pusat 10110 Abstract The 8-inch gas pipeline bridge rehabilitation project in the Mundu-Sunyaragi segment is part of PT Pertamina Gas^s strategic efforts to ensure the reliability and safety of natural gas distribution in densely populated areas. This internship aimed to examine the material specifications and structural designs used in the project, particularly at three bridge locations: Signarela, Karangsambung, and Kedaton. The assessment was carried out through a technical literature review, analysis of the Work Plan and Requirements (RKS) documents, and observation of the procurement process within the Supply Chain Management (SCM) Division. The evaluation showed that the selection of structural steel materials, such as IWF and UNP profiles, was appropriately aligned with technical requirements and field conditions, including mechanical loads and environmental risks. Furthermore, the implemented structural designs considered functional lifespan, cost efficiency, and long-term safety. This internship also provided practical experience in understanding the integration between technical and managerial aspects in national energy infrastructure projects. Keywords: Gas Pipeline Bridge, Material Specification, Structural Design, Supply Chain Management, Work Plan and Requirements Share Link | Plain Format | Corresponding Author (Ezalicha Fatya Jasmine)

205	Material Physics	ABS-253
Pengujian Ketahanan Tekan Tepi (Edge Crush Test) pada Karton Gelombang Siti Waryuni (a*), Anggara Budi Susila (b), Asry Rahmawati (b) a) Program Studi Fisika, FMIPA, Universitas Negeri Jakarta, Jl. Rawamangun Muka, Jakarta Timur, 13220, Indonesia *sitiwaryuni10[at]gmail.com b) Balai Besar Standardisasi dan Pelayanan Jasa Industri, Kimia, Farmasi dan Kemasan, Jl. Balai Kimia No. 1, Pekayon, Kec. Ps Rebo, Kota Jakarta Timur, 13710, Indonesia Abstract Karton gelombang merupakan salah satu bahan kemasan yang banyak digunakan dalam industri karena ringan, kuat, dan mampu memberikan perlindungan yang baik terhadap produk selama proses penyimpanan maupun distribusi. Untuk mengetahui seberapa besar kekuatan sisi karton dalam menahan beban tumpukan dari arah atas, dilakukan pengujian menggunakan metode Edge Crush Test (ECT). Pengujian ini bertujuan untuk memahami prinsip dan prosedur ECT berdasarkan standar ISO 3037, serta menganalisis performa mekanik dari beberapa jenis karton gelombang yang digunakan sebagai bahan kemasan. Tiga sampel karton diuji, masing-masing dengan tujuh spesimen. Parameter utama yang diamati adalah gaya maksimum tekan (fmax) dan koefisien variasi (v%) dari tiap sampel. Hasil pengujian menunjukkan bahwa Sampel B memiliki nilai fmax tertinggi sebesar 6,473 kN/m dan variasi data paling rendah, yang mengindikasikan mutu bahan dan konsistensi produksi yang baik dibandingkan dua sampel lainnya. Melalui kegiatan ini, diperoleh pemahaman mengenai hubungan antara struktur karton dan daya tahannya terhadap tekanan saat kemasan ditumpuk dalam proses penyimpanan maupun pengangkutan. Keywords: Edge Crush Test, Karton Gelombang, Kekuatan Tekan, ISO 3037, Kemasan Industri Share Link | Plain Format | Corresponding Author (Siti Waryuni)

206	Material Physics	ABS-254
Analisis Kinerja Coating Barium Heksaferit Polianilin Sebagai Penyerap Gelombang Radar Pada Material Komposit Pesawat Tempur Dan Kapal Militer Di Lingkungan Tropis Maria Crysen Sagala a) Program Studi Fisika, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Negeri Jakarta, Jl. Rawamangun Muka No.1, Jakarta Timur b) Balitbang Kementerian Pertahanan, Jl. Jati Raya Tim. No.1, RT.6/RW.6, Pd. Labu, Kec. Cilandak, Kota Jakarta Selatan, Daerah Khusus Ibukota Jakarta Abstract Penggunaan material penyerap gelombang radar (Radar Absorbing Material/RAM) menjadi krusial dalam meningkatkan kemampuan stealth pada sistem pertahanan militer. Penelitian ini bertujuan untuk mengkaji performa komposit Barium Heksaferit (BaFe12O19) dan Polianilin (PANI) sebagai RAM, khususnya untuk aplikasi coating pada pesawat tempur dan kapal militer di lingkungan tropis. Melalui metode studi literatur terhadap berbagai jurnal ilmiah dan standar teknis, analisis dilakukan terhadap mekanisme penyerapan gelombang, pengaruh morfologi, doping, serta ketahanan terhadap kondisi ekstrem seperti kelembapan tinggi, suhu fluktuatif, paparan UV, dan udara laut. Hasil kajian menunjukkan bahwa komposit BaFe12O19-PANI mampu mencapai nilai reflection loss hingga -49.028 dB pada frekuensi 8.2 GHz dalam konfigurasi multilayer, menandakan efisiensi serapan lebih dari 99 persen. Material ini menunjukkan stabilitas magnetik dan konduktivitas yang baik pada suhu hingga 300 derajat Celsius dan kelembapan 85 persen RH, serta ketahanan terhadap korosi hingga 1500 jam dalam simulasi lingkungan laut. Dengan efisiensi tinggi, ketahanan lingkungan, dan metode aplikasi yang sederhana, BaFe12O19-PANI merupakan komposit yang kuat untuk pengembangan RAM dalam sistem pertahanan nasional, terutama di wilayah tropis. Keywords: Barium Heksaferit, polianilin, radar absorbing material (RAM), komposit elektromagnetik, reflection loss. Share Link | Plain Format | Corresponding Author (Maria Crysen Sagala)

207	Material Physics	ABS-255
Durability Analysis of API 5L Grade X65M PSL 2 Carbon Steel Pipe Material in the Cikampek-Plumpang Fuel Pipeline Project of PT Pertamina Gas Arini (a*), Bambang Heru Iswanto (b), Valdi Sina Ilman (b) a) Physics Study Program, Faculty of Mathematics and Natural Sciences, Jakarta State University b) PT Pertamina Gas Abstract During the internship at the Supply Chain Management (SCM) Division of PT Pertamina Gas, the author was involved in supporting a national strategic project involving the procurement of API 5L Grade X65M carbon steel pipes for the Cikampek-Plumpang gas transmission line. Activities included data entry into the SCMboard system, monitoring procurement methods such as limited tenders, open tenders, direct selection, and direct appointment, as well as analyzing technical documents. One important aspect studied was compliance with acceptance criteria, including outer dimension tolerances, wall thickness, pipe length, and mechanical property testing. API 5L X65M pipes were selected due to their combination of high tensile strength, competitive pricing, and compatibility with external protective systems such as Fusion Bonded Epoxy coating. Literature reviews and market data from S&P Global Commodity Insights indicate that the Asia-Pacific region has high demand for pipes, while also serving as a source of vendors offering prices and quality in line with international standards. The reliability of the pipes is further validated through Manufacturing Procedure Specification (MPS) and Inspection and Test Plans (ITP) documents, which include comprehensive testing such as hydrostatic pressure testing, tensile testing, impact testing, and full ultrasonic testing. The Cikampek-Plumpang pipeline project crosses densely populated areas and is susceptible to corrosion, making material selection and inspection systems critical factors in ensuring the safety and efficiency of gas distribution. Through this internship, the author gained an understanding of procurement processes at the headquarters and the technical contributions to the success of national projects. This experience demonstrates that limitations in academic background are not a barrier as long as there is a willingness to learn, adapt, and actively contribute. Keywords: API 5L X65M- Carbon Steel- Manufacturing Procedure Specification Share Link | Plain Format | Corresponding Author (Arini Arini)

208	Medical Physics and Biophysics	ABS-22
Evaluating Renal Time-Integrated Activity Coefficient in [177Lu]Lu-DOTA-TATE Therapy: Simultaneous vs. Separate Kidney Modeling Using Non-linear Mixed-effects Modeling Indra Budiansah1, a), Assyifa R. Hakim1, Fira Dwi Ananda1, Supriyanto Ardjo Pawiro 1,b), Deni Hardiansyah1, c) 1Faculty of Mathematics and Natural Sciences, Medical Physics and Biophysics Division, Physics Department, Universitas Indonesia, Depok, Indonesia a)indra.budiansah[at]ui.ac.id- b)supriyanto.p[at]sci.ui.ac.id- c)denihardiansyah[at]ui.ac.id Abstract This study aimed to compare renal time-integrated activity coefficients (TIACs) in [177Lu]Lu-DOTA-TATE therapy using non-linear mixed-effects modeling (NLMEM), by evaluating the effect of the fitting setting method of left and right kidney biokinetic data to TIAC calculation. Renal biokinetic data of [177Lu]Lu-DOTA-TATE were collected from ten patients with neuroendocrine tumors from literature (PMID:33443063). SPECT/CT imaging was performed between days 1 and 7 after-injection. The bi-exponential function parameters were fitted to biokinetic data using NLMEM performed using NONMEM software, with two fitting approaches: simultaneous fitting of both kidneys and separate fitting of the left and right kidneys. TIACs from the simultaneous fitting were defined as simultaneous TIACs (siTIACs), and those from separate fitting as separated TIACs (seTIACs). The differences between siTIACs and seTIACs were assessed using relative deviations (RDs), with seTIACs considered equivalent to siTIACs if RD was below 5%. The bi-exponential function successfully describes the renal biokinetic data. seTIACs showed good agreement with the siTIACs, with median[min, max] RD of -1.6[-4.5, 0.8]%. Simultaneous fitting of left and right kidneys biokinetic data using the NLMEM approaches produced similar TIACs to those obtained from separate fittings. Therefore, TIACs from simultaneous and separate fittings of renal biokinetic data are comparable and clinically applicable. Keywords: TIAC, NLMEM, NONMEM, [177Lu]Lu-DOTA-TATE Share Link | Plain Format | Corresponding Author (Indra Budiansah)

209	Medical Physics and Biophysics	ABS-308
Innovation of PVA-Silica Xerogel Composite Film as a Packaging Material with Thermal Insulation Capability Yusmaniar, Intan Fadia Andani, Futi Kusuma Hati1, Afrizal Department of Chemistry, Universitas Negeri Jakarta Jln. Rawamangun Muka, Jakarta 13320, Indonesia Abstract Uncontrolled temperature fluctuations are a major factor contributing to the deterioration of food products, leading to quality degradation, microbial growth, and an increased risk of foodborne illnesses. Therefore, the development of effective thermal insulation materials for packaging is crucial to maintaining food temperature and ensuring safety. This research focuses on developing a packaging film based on polyvinyl alcohol (PVA), combined with silica xerogel synthesized from rice husk ash. The film was fabricated using the casting method, incorporating varying concentrations of silica xerogel-specifically 0%, 1%, 3%, 5%, and 7%. The results showed that the film containing 3% silica xerogel exhibited the optimal tensile strength, reaching 25.27 MPa. Additionally, higher concentrations of silica xerogel in the PVA/xerogel composite film were associated with longer environmental degradation times. Overall, the incorporation of silica xerogel into PVA films has proven effective in maintaining food shape and integrity, supporting its potential as a thermal insulation packaging material. Keywords: Please Just Try to Submit This Sample Abstract Share Link | Plain Format | Corresponding Author (Yusmaniar Yusmaniar)

210	Medical Physics and Biophysics	ABS-58
Discriminating Benign and Malignant Breast Lesions Using Shape Descriptors in Ultrasound Syahril Siregar1, Zahra Azizah2, Djarwani Soeharso Soejoko1 1. Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Indonesia, Depok 16424, Indonesia 2. Department of Computer and Informatics Engineering, Politeknik Negeri Jakarta, Jl. Prof. Dr. G.A. Siwabessy, Kampus Universitas Indonesia Depok, 16425, Indonesia Abstract Accurate differentiation between benign and malignant breast lesions in ultrasound imaging is essential for timely and appropriate clinical decision-making. While convolutional neural networks (CNNs) have demonstrated high classification performance, their lack of interpretability poses challenges in understanding the morphological basis of their predictions. To address this, the present study emphasizes the use of interpretable, shape-based descriptors rather than texture-based features. Six Shape Factor Analysis metrics-minimum-to-maximum axis ratio, circularity, solidity, extent, elongation, and eccentricity-were extracted from a publicly available dataset containing labeled ultrasound images of breast lesions. Partial Least Squares Discriminant Analysis (PLS-DA) applied to these metrics revealed a clear separation between benign and malignant categories using three latent variables, achieving a cross-validated accuracy of 0.924 and an F1-score of 0.857. All shape features contributed significantly to class distinction, with solidity, extent, and elongation identified as the most influential. Benign lesions exhibited higher values in circularity, solidity, extent, elongation, and eccentricity, reflecting their typically regular and well-defined morphology. Conversely, malignant lesions showed lower values, consistent with their irregular and infiltrative structure. These results underscore the potential of shape-based analysis as an interpretable and physiologically meaningful approach to improving breast lesion classification in ultrasound imaging. Keywords: Breast Cancer Detection, Ultrasound Imaging, Shape Factor Analysis, PLS-DA, Benign and Malignant Lesions Share Link | Plain Format | Corresponding Author (Syahril Siregar)

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