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121	Instrumentation and Computational Physics	ABS-250
PENGARUH POSISI PEMASANGAN TERHADAP AKURASI PENGUJIAN TERA METER AIR RUMAH TANGGA PADA VARIASI FLOW RATE Regita Nababan(1), Esmar Budi(2) , Romadhon Nuzuly(3) Program Studi Fisika, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Negeri Jakarta Unit Pengelola Metrologi Provinsi DKI Jakarta email: regitanababan354[at]gmail.com Abstract Penelitian ini bertujuan untuk menganalisis pengaruh posisi pemasangan terhadap akurasi pengujian tera meter air rumah tangga pada variasi flow rate. Penelitian dilakukan di UP Metrologi Jakarta selama program Praktik Kerja Lapangan (PKL) menggunakan metode eksperimental. Satu alat meter air diuji dalam empat posisi berbeda (berdasarkan jarak dari sumber air) dan tiga variasi flowrate (1600 lph, 128 lph, dan 32 lph). Volume yang terbaca oleh meter air dibandingkan dengan volume aktual yang diukur menggunakan bejana ukur standar. Hasil menunjukkan bahwa variasi posisi dan flow rate memengaruhi akurasi pembacaan. Pada posisi tertentu dan flow rate rendah, kesalahan pengukuran cenderung lebih besar dan fluktuatif. Posisi 1 (0,50 m) menghasilkan kesalahan yang lebih besar terutama pada flow rate rendah, sedangkan posisi 3 (1,75 m) menunjukkan konsistensi lebih baik. Penelitian ini menegaskan pentingnya prosedur standar pemasangan meter air untuk meminimalkan kesalahan pengukuran dalam praktik metrologi legal. Temuan ini bermanfaat untuk peningkatan akurasi pengujian meter air di lapangan. Keywords: Metrologi, Flow rate, Meter Air, Tera, Akurasi, Posisi Pemasangan Share Link | Plain Format | Corresponding Author (Regita nababan)

122	Instrumentation and Computational Physics	ABS-252
ANALISIS PERBANDINGAN ERROR DAN EFEKTIVITAS PENGERJAAN PENGUJIAN METER GAS TURBIN G65 MENGGUNAKAN METODE SCANNING HEAD, LOW FREQUENCY, PUSH BUTTON, DAN CYBLE SENSOR DENGAN TEST BENCH GM-G2500 Arini Retno Nur Aisyah Erwin (a*), Hadi Nasbey (a), Widya Rachmasari (b) a) Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Negeri Jakarta *ariniretno86[at]gmail.com b) Unit Pengelola Metrologi DKI Jakarta Abstract Penelitian ini bertujuan untuk menganalisis perbandingan error dan efektivitas pengerjaan pengujian meter gas turbin G65 dengan menggunakan empat metode pengambilan data: Scanning Head, Low Frequency, Push Button, dan Cyble Sensor. Pengujian dilakukan menggunakan alat test bench GM-G2500 di Unit Pengelola Metrologi Provinsi DKI Jakarta pada tiga titik alir, yaitu Qmin, Qt, dan Qmaks. Data error dihitung dengan membandingkan volume standar dengan volume terbaca berdasarkan impuls yang diperoleh dari masing-masing metode. Hasil menunjukkan bahwa metode Low Frequency memberikan nilai error paling kecil dan proses pengerjaan yang paling efektif secara keseluruhan, meskipun Scanning Head menunjukkan performa baik di titik tertentu. Selain itu, metode Cyble Sensor juga memiliki potensi sebagai metode otomatis dengan tingkat presisi cukup baik, sementara Push Button cenderung kurang stabil. Perbandingan ini menunjukkan bahwa pemilihan metode yang tepat sangat berpengaruh terhadap akurasi dan efisiensi dalam pengujian meter gas turbin. Keywords: Meter Gas Turbin G65, Pengujian, Error, Impuls, GM-G2500, Low Frequency, Scanning Head, Cyble Sensor, Push Button. Share Link | Plain Format | Corresponding Author (Arini Retno Nur Aisyah Erwin)

123	Material Physics	ABS-256
Analisis Perpindahan Volume Korek Api Gas SPK 4208 Refillable Menggunakan cairan Aquabides Revieana Dzil Izzati(a*), Agus Setyo Budi (a), Iyud Wahyudin (b) Universitas Negeri Jakarta Abstract Laporan ini membahas hasil kegiatan Praktik Kerja Lapangan (PKL) di Balai Pengujian Mutu Barang, Direktorat Standardisasi dan Pengendalian Mutu, Kementerian Perdagangan Republik Indonesia. Fokus utama kegiatan adalah pengujian perpindahan volume korek api gas tipe SPK 4208 refillable dengan mengganti gas butana menggunakan cairan aquabides. Pengujian dilakukan menggunakan metode gravimetri dengan mengukur massa sebelum dan sesudah pengisian, lalu menghitung volume berdasarkan densitas cairan. Dari 20 sampel yang diuji, diperoleh rata-rata volume gas butana sebesar 2,5513 ml dan volume cairan aquabides sebesar 3,8410 ml. Hasil menunjukkan bahwa volume cairan yang masuk lebih besar dibandingkan volume gas awal, disebabkan perbedaan densitas dan sifat fisik antara kedua fluida. Evaluasi dilakukan berdasarkan standar, dan hasilnya menunjukkan bahwa variasi volume antar sampel tergolong kecil dan seragam, menandakan produk memenuhi syarat mutu. Kegiatan PKL ini memberikan pengalaman langsung dalam prosedur uji mutu, pengolahan data, serta memperkuat pemahaman tentang pentingnya akurasi dan konsistensi dalam pengujian produk kemasan. Keywords: Korek api gas, SPK 4208, Aquabides, Volume cairan, Metode gravimetri, SNI Share Link | Plain Format | Corresponding Author (Revieana Dzil Izzati)

124	Material Physics	ABS-257
PENGUJIAN KERETAKAN KOTAK KARTON GELOMBANG (BURSTING STRENGTH) BERDASARKAN ISO 2758:2014 Dwi Nurhaliza(a*), Mangasi Alion Marpaung(a), Agung Adiseno Arief Permono(b) (a) Program Studi Fisika, FMIPA, Universitas Negeri Jakarta, Jl. Rawamangun Muka, Rawamangun, Jakarta Timur 13220, Indonesia (b) Balai Besar Standardisasi dan Pelayanan Jasa Industri Kimia, Farmasi, dan Kemasan *Email: dwinurhaliza88[at]gmail.com Abstract Kotak karton gelombang (KKG) merupakan salah satu bahan kemasan yang paling umum digunakan karena sifatnya yang ringan, kokoh, dan ekonomis. Untuk mengetahui seberapa besar kemampuan karton dalam menahan tekanan dari arah tegak lurus, dilakukan pengujian menggunakan metode Bursting Strength sesuai standar ISO 2758:2014. Praktik kerja ini dilaksanakan di Laboratorium Kemasan Produk dan Bahan BBSPJIKFK dengan tujuan memahami prosedur pengujian dan karakteristik ketahanan retak karton terhadap tekanan hidrolik. Pengujian dilakukan pada tiga sampel KKG dengan masing-masing delapan spesimen. Parameter utama yang dianalisis adalah nilai gaya maksimum (dalam kPa) yang dikonversi menjadi bursting strength (kgf/cm^2), serta perhitungan standar deviasi dan ketidakpastian gabungan. Hasil pengujian menunjukkan bahwa Sampel A memiliki ketahanan retak tertinggi dan tingkat variasi hasil yang paling rendah, sehingga dianggap sebagai sampel dengan kualitas paling baik. Kegiatan ini memberikan pemahaman kepada mahasiswa mengenai pentingnya karakteristik fisis bahan kemasan dan keterkaitannya dengan mutu serta keandalan produk dalam distribusi industri. Keywords: Bursting Strength, Karton Gelombang, ISO 2758, Kemasan Industri, Ketahanan Retak Share Link | Plain Format | Corresponding Author (Dwi Nurhaliza)

125	Material Physics	ABS-2
Analysis of Characteristics Comparison between New Brake Lining and 100-hour Flight Cessna 208B Indreswari Suroso1, Triyono2, Eko Surojo3, and Heru Sukanto4 Mechanical Engineering Department, 57126, Universitas Sebelas Maret, Jl. Ir. Sutami 36 Kentingan, Surakarta, Jawa Tengah, Indonesia Abstract Brake lining is part of the brake system that creates the friction needed in the braking process. The purpose of this study was to compare the characteristics of the new brake lining with the brake lining with 100 flight hours. The method used was experimental with chemical composition, hardness, and wear testing. The test results showed that the results of the chemical composition test of the new brake lining material, Cleveland brand type 66-033 metallic, consisted of 77.489% Cu- 15.81% Fe- 6.047% Si- 0.305% Mn- 0.34% Ni. Meanwhile, after being used for 100 flight hours, it changed to 95.9% Fe, 0.33% C, 0.8% Cu, 0.235% Si, 0.468% Mn, 0.235% Al, 0.151% Mo, and 0.774% Cr. The brake lining used for 100 flight hours has been contaminated with Al, Si, Mo, Cr, and C. The hardness of the brake lining after 100 flight hours is 207 HB compared to the hardness of the new brake lining 79.65 HB. This increase in hardness is caused by overheating, contamination of lubricant elements, and rapid cooling process after braking. The difference in average wear between the brake lining used for 100 flight hours and the new brake lining is small, namely 0.000038 mm3/kg.m. Routine maintenance plays an important role in maintaining the performance of the brake lining and the brake system so that they function efficiently and prevent excessive wear. Keywords: brake lining- brake system- chemical composition- hardness- wear Share Link | Plain Format | Corresponding Author (Indreswari Suroso)

126	Material Physics	ABS-258
Pengujian Kekuatan Tekan Kotak Karton Gelombang (Box Compression Test) Menggunakan Mesin Uji Tekan Gaynes Berdasarkan ISO 12048:1994 Aida Hafizah Nabila (a*), Anggara Budi Susila (a), Yusuf Gilar Sumarsono (b) a) Program Studi Fisika, FMIPA, Universitas Negeri Jakarta, Jl. Rawamangun Muka, Rawamangun, Jakarta Timur 13220, Indonesia b) Balai Besar Standardisasi dan Pelayanan Jasa Industri Kimia, Farmasi, dan Kemasan *Email: nabilaai2894[at]gmail.com Abstract Pengemasan memiliki peran strategis sebagai pelindung produk selama proses penyimpanan, transportasi, hingga sampai ke tangan konsumen. Untuk memastikan kekuatan dan ketahan kemasan, dilakukan pengujian kekuatan tekan pada kotak karton gelombang (KKG) menggunakan mesin uji tekan gaynes berdasarkan standar ISO 12048:1994. Tujuan utama pengujian adalah untuk mengetahui gaya tekan vertikal maksimum yang dapat ditahan oleh kemasan dalam kondisi standar. Tiga jenis sampel (A, B, dan C) diuji masing-masing sebanyak lima kali. Hasil pengujian menunjukkan bahwa Sampel A memiliki kekuatan tekan rata-rata tertinggi sebesar 299,80 kgf, diikuti oleh Sampel B (298,20 kgf) dan Sampel C (288,40 kgf). Variasi hasil antar sampel mengindikasikan adanya perbedaan struktur fluting, kualitas perekat, atau ketepatan penempatan sampel selama pengujian. Keywords: Kotak Karton Gelombang, Box Compression Test, ISO 12048:1994 Share Link | Plain Format | Corresponding Author (Aida Hafizah Nabila)

127	Material Physics	ABS-259
Analisis Efektivitas Material Magnetik Sebagai Penyerap Gelombang Elektromagnetik Untuk Radar ABbsorbent Material (RAM) Menggunakan Alat Uji Vector Network Analyzer (VNA) Windi Putri Lisna Dewi(1*), Eko Misrianto(1), Erfan Handoko(2) 1. Program Studi Fisika Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Negeri Jakarta 2. Badan Penelitian dan Pengembangan Kementerian Pertahanan Abstract Radar Absorbing Material (RAM) berperan penting dalam teknologi siluman untuk mereduksi pantulan gelombang radar. Studi ini bertujuan untuk menganalisis karakteristik penyerapan gelombang elektromagnetik dari empat material magnetik Fe3O4, NiFe2O4-, BaMnFe, dan Co3O4 berdasarkan nilai Reflection loss (RL) dalam rentang frekuensi 8-12 GHz. Hasil menunjukkan bahwa Co3O4 memiliki efisiensi penyerapan tertinggi (RL minimum -31,64 dB), diikuti oleh BaMnFe (-30,5 dB), NiFe2O4 (-23,35 dB), dan Fe3O4 (-3,96 dB). Frekuensi kerja optimal masing-masing material bervariasi, dengan Co3O4 menempati posisi paling unggul dalam lebar pita penyerapan dan kestabilan RL. Perbedaan efisiensi ini dipengaruhi oleh kombinasi sifat magnetik, dielektrik, dan kemampuan impedance matching masing-masing material. Studi ini menunjukkan pentingnya pemilihan material magnetik yang tepat untuk pengembangan RAM pada aplikasi radar X-band. Keywords: Reflection loss, material magnetik, RAM, gelombang elektromagnetik, teknologi stealth Share Link | Plain Format | Corresponding Author (Windi Putri Lisna Dewi)

128	Material Physics	ABS-4
Research Trends in the Application of Bi2O3/ZnO Photocatalysts for the Degradation of Dyes in Wastewater: A Bibliometric Analysis (2015-2025) Mohammad Arifin (a,d,e), Heri Sutanto (b,e*), Hadiyanto (a,c), Ilham Alkian (a,e) a) Doctoral Program of Environmental Science, School of Postgraduate, Diponegoro University, Semarang-Indonesia 50275 b) Department of Physics, Faculty of Science and Mathematics, Diponegoro University, Semarang-Indonesia 50275 c) Department of Chemical Engineering, Faculty of Engineering, Diponegoro University, Semarang-Indonesia 50275 d) Sinar Cendekia Institute of Teacher Training and Education, Tangerang Selatan-Indonesia 15310 e) Smart Materials Research Center (SMARC), Diponegoro University, Semarang-Indonesia 50275 Abstract Water pollution caused by various industries, including textiles, leather, paper, cosmetics, and food processing, poses significant environmental threats. One of the most concerning pollutants in industrial wastewater is dye, which often contains hazardous levels of chromium and other toxic substances, making it harmful to both human health and aquatic ecosystems due to its non-biodegradable nature. To address this, researchers have explored dye degradation techniques using advanced oxidation processes (AOPs), with bismuth/zinc oxide (Bi2O3/ZnO) photocatalysts showing promise. This study provides a bibliometric analysis of research trends on Bi2O3/ZnO photocatalysts for dye degradation from 2015 to 2025, based on data from the Scopus database. A total of 40 publications were analyzed, highlighting key research trends, leading countries and institutions, and future directions for advancing photocatalytic dye degradation. Keywords: bibliometric analysis, Bi2O3/ZnO, dye degradation, water pollution Share Link | Plain Format | Corresponding Author (Mohammad Arifin)

129	Material Physics	ABS-261
Analisis Kinerja Piezoelektrik pada Sensor Hydrophone untuk Aplikasi Deteksi Bawah Air Olivia Fauziah (a*), Erfan Handoko (b), Eko Misrianto (b) Program Studi Fisika, Fakultas Matematika dan Ilmu Pengetahuan Alam, Universitas Negeri Jakarta, Jl. Rawamangun Muka Raya No.11, Rawamangun, Jakarta Timur, 13220, Indonesia *oliviafauziah01[at]gmail.com Abstract Penelitian ini bertujuan untuk menganalisis kinerja bahan piezoelektrik yang digunakan pada sensor hydrophone untuk aplikasi deteksi bawah air. Sensor hydrophone berperan penting dalam sistem akustik bawah laut karena kemampuannya mendeteksi gelombang suara di dalam air dan mengubahnya menjadi sinyal listrik melalui efek piezoelektrik. Kajian ini dilakukan secara kualitatif melalui studi literatur terhadap berbagai jenis bahan piezoelektrik seperti PZT (Lead Zirconate Titanate), PVDF (Polyvinylidene Fluoride), dan komposit piezoelektrik. Analisis difokuskan pada parameter performa utama seperti sensitivitas, respons frekuensi, stabilitas termal, serta ketahanan lingkungan. Hasil penelitian menunjukkan bahwa material PZT memiliki sensitivitas tinggi dan efisiensi konversi energi yang baik, namun kurang fleksibel dan rentan terhadap lingkungan korosif. Sebaliknya, PVDF menawarkan fleksibilitas mekanik dan ketahanan lingkungan yang lebih baik, tetapi memiliki sensitivitas lebih rendah. Strategi kombinasi material atau struktur komposit diidentifikasi sebagai solusi potensial untuk meningkatkan performa sensor hydrophone secara menyeluruh. Dengan demikian, pemilihan dan rekayasa material piezoelektrik yang tepat menjadi kunci dalam pengembangan sensor hydrophone yang lebih optimal untuk kebutuhan deteksi bawah air. Penelitian ini diharapkan dapat menjadi landasan dalam perancangan teknologi sensor akustik bawah laut yang lebih efisien dan adaptif terhadap kondisi lingkungan ekstrem. Keywords: Piezoelektrik, Hydrophone, Deteksi Bawah Air, PZT, PVDF, Sensor Akustik, Material Komposit Share Link | Plain Format | Corresponding Author (Olivia Fauziah)

130	Material Physics	ABS-8
Energy Gap Analysis of Ba0.25Sr0.75TiO3 Thin Film on Glass Indium Tin Oxide (ITO) Substrate Rony Febryarto (a,b), Novia Fransiska Simbolon(a), Dea Widiawati(a), Naila Nur Alifa(a), Irzaman(a) a) Department of Physics, Faculty of Mathematics and Natural Sciences, IPB University, Bogor, Indonesia, 16680 b) Electronics Research Center, National Research and Innovation Agency, Bandung, Indonesia, 40135 Abstract Ba0.25Sr0.75TiO3 thin film on Indium Tin Oxide (ITO) glass substrate has been successfully made by Chemical Solution Deposition (CSD) method with 0.5 M solubility assisted by 3000 rpm spin coating, and annealing at 550 &#8451- with temperature speed of 100 &#8451-/hour held for 8 hours and decreased temperature. Indium Tin Oxide (ITO) glass substrate with glass thickness of 1.1mm and resistivity of ~20 ohms/sq. This thin film was tested for optical properties using UV-Vis Spectrophotometer with a range of 230-850 nm and resulted in an energy gap of 2.29 eV. Energy gap analysis of Ba0.25Sr0.75TiO3 thin film on glass Indium Tin Oxide (ITO) substrate is very important because this film is the forerunner of light sensor. Keywords: Ba0.25Sr0.75TiO3, Energy Gap, light sensor, Share Link | Plain Format | Corresponding Author (Rony Febryarto)

131	Material Physics	ABS-13
Physicochemical Characterization of CaO Derived from Pearl Oyster Shells (Pinctada maxima) via Thermal Processing for Potential Biomedical Applications Maz Isa Ansyori(a), Susi Rahayu(b,c*), M. Mukaddam Alaydrus(a), Nadia Rara Rukyana(b), Dyah Purnaning (a), Nonik Septiani(b), Dian W. Kurniawidi(b), Masruroh(c) a) Medical Department, Faculty of Medicine and Health Sciences, University of Mataram, Indonesia b) Physics Department, Faculty of Mathematics and Natural Science, University of Mataram, Indonesia c)Physics Department, Faculty Mathematics and Natural Science, Universitas Brawijaya, Indonesia *susirahayu[at]unram.ac.id Abstract The thermal transformation of calcium carbonate (CaCO3) into calcium oxide (CaO) from marine biogenic materials such as Pinctada maxima shells presents strong potential for biomedical material development. This study investigates the physicochemical properties of shell powder calcined at temperatures ranging from 700C to 1100C for 6 hours. Characterization was conducted using organoleptic tests, EDX, FTIR, SEM, and XRD. Organoleptic evaluation confirmed the powder to be odorless, white, and fine in texture. EDX analysis showed a marked increase in CaO content, peaking at 99.68% at 1100C, indicating successful thermal decomposition of CaCO3. FTIR results showed the disappearance of carbonate (CO32-) and C-H bands and the emergence of O-H and Ca-O bands, confirming the formation of CaO. XRD analysis revealed a phase transition from aragonite and calcite (orthorhombic) to CaO (cubic), along with a decrease in crystallinity from 56.95% to 48.32%. SEM analysis indicated irregular particle morphology with the largest average size (2638.77 nm) at 1100C. These transformations in structure and composition demonstrate the relevance of biophysical material, particularly its potential in bone regeneration applications. This study provides fundamental insights into the conversion of marine shell waste into bioactive material for future biomedical use. Keywords: Biomaterials, Calcination, Calcium Oxide, Pinctada maxima, Physicochemical Properties, Share Link | Plain Format | Corresponding Author (Susi Rahayu)

132	Material Physics	ABS-15
UTILIZATION OF TiO2-DOPED ACTIVATED CARBON FROM TEAK WOOD SAWDUST FOR PURIFICATION OF USED COOKING OIL Noni Novianti, Irfan Khadam, Mulda Muldarisnur* Department of Physics, Andalas University, West Sumatra, Indonesia Abstract The intensive application of cooking oil poses environmental issues and health concerns. Research has been conducted to reduce of free fatty acids, water content, density, pH, viscosity, and refractive index of used cooking oil using TiO2-doped activated carbon produced from teak wood sawdust. Carbon was activated using a 10% ZnCl&#8322- solution before water and ash content measurements. Doping was carried out via solid-state synthesis with TiO&#8322-:activated carbon mass ratios of 9:100, 14:100, 18:100, and 22:100. The doped activated carbon underwent XRD characterization. Used oil was tested for water content, free fatty acids, pH, density, refractive index, viscosity, and clarity using UV-vis spectroscopy and FTIR. Activated carbon showed 3.60% water and 0.69% ash content. XRD results indicated a reduction in crystal size from 38.89 nm to 26.8 nm after TiO&#8322- doping. In treated oil, water content decreased from 0.38% to 0.15%, viscosity from 38 cP to 32 cP, refractive index from 1.69 to 1.5, density from 0.6613 to 0.588, and free fatty acids from 1.39% to 0.15%. UV-vis absorbance dropped from 3.06 to 2.88. The 14:100 mass ratio showed the best performance, indicating that TiO&#8322--doped activated carbon is an effective adsorbent to restore the quality of used cooking oil. Keywords: Used cooking oil, activated carbon, TiO2, Purification, adsorbent Share Link | Plain Format | Corresponding Author (Noni Novianti)

133	Material Physics	ABS-16
Bioplastic Reinforced by Microcrystalline Cellulose via Sonication-Assisted Solvent Blending: Mechanical and Morphological Properties Catur Pramono (a), Dody Ariawan (a*), Wijang Wisnu Raharjo (a), Mujtahid Kaavessina (b) a) Department of Mechanical Enginering, Universitas Sebelas Maret, Surakarta, Indonesia *dodyariawan[at]staff.uns.ac.id b) Department of Chemical Enginering, Universitas Sebelas Maret, Surakarta, Indonesia Abstract The properties of polylactic acid (PLA) are encouraging as a bioplastic that could substitute conventional petroleum-based plastics. The objective of this research is to enhance the mechanical properties of PLA for a broader range of applications by incorporating Microcrystalline Cellulose (MCC) as a filler. Solvent blending is employed in conjunction with sonication to incorporate MCC into the PLA matrix. The MCC composition varies in 0 and 10wt%, and the sonication time was varied by 0, 5, 10, and 15 min. The results of mechanical testing on composite PLA sheets, which included the tensile test (ASTM D638) and puncture test (ASTM 2582), indicated that the presence of MCC can enhance tensile strength and puncture resistance. The efficacy of the sonication was demonstrated for five minutes. This is due to the effective dispersion of MCC in PLA, which leads to an increase in the tensile strength and puncture resistance of PLA. The morphological image shows that the MCC dispersion after five minutes of sonication is more homogeneous than at other durations. Keywords: bioplastic, polylactic acid, microcrystalline cellulose Share Link | Plain Format | Corresponding Author (Dody Ariawan)

134	Material Physics	ABS-17
Influence of Electroless Coating on Bottom Ash Reinforcement in Aluminum Matrix Composites: A Study of Microstructure and Mechanical Properties Sefrian Rizki Bintoro (a), Eko Surojo (a), Nurul Muhayat (a), Triyono (a*) a) Department of Mechanical Engineering, Universitas Sebelas Maret Jl. Ir. Sutami No.36, Jebres, Kec. Jebres, Kota Surakarta, Jawa Tengah 57126, Indonesia *triyono74[at]staff.uns.ac.id Abstract Aluminum Matrix Composites (AMC) are widely applied in aerospace, transportation, and mining industries. Bottom Ash (BA), a coal industry by product, can serve as a reinforcement material in AMC. However, poor wettability during fabrication can weaken interfacial bonding and reduce mechanical performance. This issue can be mitigated by applying surface coatings to the reinforcement particles with the Electroless Coating (EC) method. This research investigates the utilization of Bottom Ash (BA) as reinforcement in Aluminum Matrix Composites (AMC) based on the Al-6061 alloy, with and without EC treatment. The process of making AMC was carried out using the stir casting method with variations of BA addition of 2%wt and 4%wt. Material characterization includes hardness testing, tensile strength testing, and metallographic observation. The results show that EC increases wettability, reduces porosity, and strengthens the interfacial bond. AMC with 2%wt bottom ash with electroless coating achieved a tensile strength of 122.6 MPa and a hardness of 45.7 BHN, significantly increased compared to without addition. At 4%wt bottom ash with electroless coating, the highest tensile strength of 128.2 MPa and hardness of 48.5 BHN were achieved, although without EC, the 4%wt fraction reduced strength due to agglomeration and the brittle intermetallic phase Al5FeSi. The EC treatment on bottom ash particles enhances their wettability and bonding with the Al-6061 matrix, leading to reduced porosity and minimized particle agglomeration. Keywords: Aluminum Matrix Composites- Bottom Ash- Electroless Coating- Wettability- Intermetallic Phase Share Link | Plain Format | Corresponding Author (Triyono Triyono)

135	Material Physics	ABS-19
Experimental Study on the Influence of Variation in Thickness and Solution Temperature on the T6 Heat Treatment Process on the Dimensional Stability of Al-6061 Harjo Seputro (a), Eko Surojo (a), Dody Ariawan (a), Triyono (a*) a) Department of Mechanical Engineering, Universitas Sebelas Maret Jl. Ir. Sutami No.36, Jebres, Kec. Jebres, Kota Surakarta, Jawa Tengah 57126, Indonesia *triyono74[at]staff.uns.ac.id Abstract Aluminum spare parts are widely used in various fields of manufacturing and industry such as automotive, medical, and aerospace. The final production stage involves heat treatment, controlled heating or cooling in the solid state to modify the materials microstructure and mechanical properties. However, heat treatment can generate residual stresses that lead to shape deformation and dimensional instability. If dimensional instability occurs, the finished manufactured material will be rejected. The manufacturing method regarding the dimensional stability of AA-6061. Specimen formation with thickness variations of 2, 4, and 6 mm, followed by T6 heat treatment with solution treatment temperature variations of 540 C, 550 C, and 560 C. Dimensional stability testing using the CMM (Coordinate Measuring Machine) method. From the above explanation, it is known that research on the effect of T6 heat treatment with variations in specimen thickness and solvent temperature on the dimensional stability of AA-6061 has not been widely conducted. This study aims to obtain the right parameters to produce optimal mechanical properties without experiencing damage to the material. At thickness variations of 2 mm, 4 mm, and 6 mm, In the thickness variations of 2 mm, 4 mm, and 6 mm, the thicker the specimen, the larger the area value. Specimens with a thickness of 6mm at a temperature of 560 C have a larger area value compared to specimens with a thickness of 2 mm and 4 mm. Therefore, the 6 mm thick specimen at 560 C has the highest dimensional instability. At a dissolution temperature of 560 C with a thickness of 6 mm, the dimensional instability is higher compared to specimens with dissolution temperatures of 540 C and 550 C. Uncontrolled parameters, especially variations in heating and cooling rates, generate residual stresses that cause dimensional instability. Keywords: Al-6061- CMM (Coordinate Measuring Machine)- Dimensional Stability- Heat Treatment T6 Share Link | Plain Format | Corresponding Author (Triyono Triyono)

136	Material Physics	ABS-275
PENGARUH PENGGUNAAN MATERIAL KOMPOSIT NICKEL-GRAPHITE CARBON TERHADAP NILAI PENGUKURAN SAR PADA TEKNOLOGI GSM 900 MHZ Melisa Oceane Universitas Negeri Jakarta Abstract Tujuan dari pelaksanaan magang ini adalah untuk menganalisis efektivitas material komposit nikel-grafit karbon dalam resin epoxy dalam mereduksi nilai Specific Absorption Rate (SAR) pada perangkat telekomunikasi GSM 900 MHz. Dalam proyek ini, dikembangkan material komposit yang terdiri dari campuran serbuk nikel, grafit karbon, dan resin epoxy. Material tersebut difungsikan sebagai lapisan pelindung untuk mengurangi paparan gelombang elektromagnetik yang dipancarkan oleh perangkat telekomunikasi, sehingga dapat meningkatkan aspek keselamatan pengguna. Hasil pengujian menunjukkan bahwa penggunaan material komposit mampu menurunkan nilai SAR rata-rata sebesar 14,57% dibandingkan kondisi tanpa material. Penurunan ini menunjukkan bahwa material yang dibuat memberikan efek reduksi paparan energi RF yang diserap oleh jaringan simulasi tubuh. Temuan ini menunjukkan adanya potensi pengembangan material komposit tersebut sebagai alternatif pelapis casing perangkat komunikasi untuk mereduksi nilai SAR, namun tetap diperlukan penelitian lanjutan untuk mengoptimalkan komposisi, ketebalan, serta uji kinerja pada frekuensi yang lebih luas. Keywords: Specific Absorption Rate (SAR), material komposit, nikel, grafit karbon, resin epoxy, DASY8, GSM 900 MHz, radiasi elektromagnetik, pengurangan SAR, pelapis perangkat telekomunikasi. Share Link | Plain Format | Corresponding Author (Melisa Oceane)

137	Material Physics	ABS-278
Solid Polymer Electrolyte for Lithium Batteries and Thermoelectric Materials Based on PVA-Pyrrole and PVA-Pyrrole-CNT (Carbon Nanotube) Auliya Rahmawati, Prof. Dr. Iwan Sugihartono M.Si. , Prof.Yudianti Department of Physics Education, Universitas Negeri Jakarta Research Center for Nanotechnology, National Research and Innovation Agency (BRIN) Abstract This study was conducted as part of an internship program at the National Research and Innovation Agency BRIN from February to May 2025. The project focused on the synthesis and characterization of energy-related materials, specifically solid polymer electrolytes SPE for lithium batteries and thermoelectric materials based on PVA Pyrrole and PVA Pyrrole CNT. The SPE was synthesized using polyethylene oxide PEO with lithium bis trifluoromethanesulfonyl imide LiTFSI, nanosilica, and nanocellulose. Electrochemical characterization was carried out using cyclic voltammetry CV, electrochemical impedance spectroscopy EIS, and galvanostatic charge discharge GCD to assess ionic conductivity and electrochemical stability. The sample with acid-treated nanosilica showed the highest ionic conductivity of 4 point 42 times 10 to the minus 5 S per cm. Thermoelectric materials were prepared via in situ polymerization of PVA and pyrrole, with and without CNTs, and some were treated with hydrochloric acid HCl 0 point 08 M. The Seebeck coefficient was used to evaluate thermoelectric performance. The highest value of 6 point 82 millivolt per kelvin and power factor of 66 point 04 microwatt per meter kelvin squared were obtained from the CNT sample treated with HCl. This internship provided practical experience in the development of environmentally friendly polymer-based materials for energy storage and conversion applications. Keywords: Solid Polymer Electrolyte, Lithium Battery, PEO, LiTFSI, PVA-Pyrrole, Carbon Nanotube, Thermoelectric, Seebeck Coefficient, EIS Share Link | Plain Format | Corresponding Author (Auliya Rahmawati)

138	Material Physics	ABS-23
Preparation of micro-sized cellulose from rice husk using ball mill and acid hydrolysis method Yessi Gusnia and Widayani Sutrisno Institut Teknologi Bandung Abstract Cellulose is an environmentally friendly natural polymer material that is most abundant in nature. Cellulose material processing is increasingly being carried out in various applications because of its attractive properties. Using cellulose in very small sizes (micro/nano) can potentially increase its performance, especially in developing micro/nano cellulose-based biocomposites. This study focuses on the preparation of micro-sized cellulose from rice husk by using ball-mill and acid hydrolysis methods. Ball mill strongly grinds the cellulose mechanically at very high rpm. Acid hydrolysis mainly removes the amorphous part of the cellulose. Examination using Scanning Electron Microscope (SEM) SU3500 shows that the obtained products have microcrystalline structure (microcrystalline cellulose/ MCC). Micro-sized cellulose obtained using Ball mill looks rougher, more uniform, and smaller in size compared to that obtained using acid hydrolysis. This may indicate that ball mill produces micro-sized cellulose-containing impurities. These impurities can come from bleaching agents and cellulose residues. Keywords: cellulose- acid hydrolysis- ball mill- micro-sized cellulose- rice husk Share Link | Plain Format | Corresponding Author (Yessi Gusnia)

139	Material Physics	ABS-279
Penerapan Standar SNI dalam Pengujian Korek Api Gas untuk Menjamin Keamanan Konsumen Muhamad Syeha Nursidiq Universitas Negeri Jakarta Abstract Praktik Kerja Lapangan (PKL) ini dilaksanakan di Balai Pengujian Mutu Barang (BPMB) Kementerian Perdagangan Republik Indonesia, dengan fokus pada pengujian kualitas korek api gas berdasarkan standar SNI 19-7120-2005. Tujuan utama kegiatan ini adalah untuk memahami proses pengujian teknis korek api gas serta menganalisis data hasil uji volume gas dari dua produk berbeda, yaitu SPK 4551 dan SPK 4206. Hasil pengujian menunjukkan bahwa kedua produk memenuhi persyaratan standar dengan rasio volume gas terhadap kapasitas tangki (V1/V0) di bawah batas maksimal 85%. Produk SPK 4551 memiliki rasio V1/V0 berkisar antara 77% hingga 83%, menunjukkan karakteristik performa tinggi namun dengan variasi produksi yang cukup besar. Sebaliknya, SPK 4206 menunjukkan rasio lebih rendah yaitu 60% hingga 75%, mencerminkan pendekatan desain yang lebih konservatif dan margin keamanan yang tinggi. Dari segi kontrol kualitas, SPK 4206 menunjukkan konsistensi lebih baik dibanding SPK 4551. PKL ini memberikan pemahaman langsung kepada mahasiswa mengenai penerapan prinsip fisika dalam kontrol mutu serta urgensi penerapan standar nasional dalam menjamin keselamatan produk konsumen. Keywords: Korek api gas- SNI 19-7120-2005- Volume gas- Mutu produk Share Link | Plain Format | Corresponding Author (Muhamad Syeha Nursidiq)

140	Material Physics	ABS-26
EFFECT OF HYDROTHERMAL REACTION TIME ON THE EFFECTIVENESS OF ZINC OXIDE PHOTOCATALYST IN DEGRADING METHYL ORANGE Irfan Khadam (a*), Noni Novianti (b*), Mulda Muldarisnur (c*) a) Faculty of Mathematics and Natural Sciences, Andalas University, Jalan Limau Manis, Padang 25175, Indonesia, humas[at]unand.ac.id b) Department of Physics, Jalan Limau Manis, Padang 25175, Indonesia Abstract Textile waste pollution containing synthetic dyes such as methyl orange (MO) is a serious problem because it is difficult to degrade naturally, so it requires an effective waste treatment method. This study aims to analyze the effect of reaction time on the size of zinc oxide (ZnO) nanoparticles and their efficiency in the photocatalysis process of textile waste. Samples were synthesized using hydrothermal method with time variations of 4, 8, and 12 hours. Characterization was conducted using XRD to determine the crystal structure, lattice parameters, and crystallite size- FTIR to identify functional groups- SEM to observe surface morphology and diameter distribution- and UV-Vis spectrophotometer to evaluate the degradation efficiency. XRD results showed a hexagonal wurtzite crystal structure with the largest crystallite size of 51.30 nm at 8 hours and the smallest of 43.99 nm at 4 hours. FTIR spectra indicated the formation of Zn-O groups at wave numbers 700-450 cm^-1, with the highest absorbance at 12 hours (532.36 cm^-1). SEM showed elongated rod morphology with more uniform size distribution at 12 h (standard deviation 44.92). The highest MO degradation efficiency was achieved in the 12 h sample at 90.78%. Keywords: Hydrothermal- Methyl Orange- Zinc Oxide Share Link | Plain Format | Corresponding Author (Irfan Khadam)

141	Material Physics	ABS-29
Impact of Adhesive Composition on the Quality of Charcoal Briquettes from Corn Cob Biomass Waste as Renewable Energy Alfina Taurida Alaydrus(a), Kholik Hidayatullah(b), Susi Rahayu(a,c,*), Ricky Indrayadi Saputra(a), Hurnah(a), Siti Rubiah(a), Weny Yulianingsih(a), I Wayan Sudiarta(a) (a)Physics Department, Faculty of Mathematics and Natural Sciences, University of Mataram, Lombok, Indonesia. (b)Physics Department, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Bandung, Indonesia (c)Physics Department, Faculty of Mathematics and Natural Sciences, University of Brawijaya, Malang, Indonesia *) Corresponding author: susirahayu[at]unram.ac.id Abstract The global energy crisis urges the environmentally friendly development of sustainable alternative energy. In recent decades, research has focused on using biomass waste as a renewable energy source. Corn cobs are abundant biomass waste and can be modified into charcoal briquettes. This study aimed to analyze the effect of tapioca flour adhesive composition on the density, compressive strength, elastic modulus, and energy value of charcoal briquettes. Manufacturing charcoal briquettes from corn cob waste use the carbonization method at 300C. The briquette-making process begins with manufacturing corn cob powder, charring, mixing, molding, and analysis of briquette characteristics. Briquettes were analyzed by measuring density, compressive test, elastic modulus, and calorific value analysis. Density measurement using analytical scales and calipers, compressive test and elastic modulus analysis with tensilon, and heat analysis with a bomb calorimeter. The analysis results stated that the amount of adhesive composition is directly proportional to the density, compressive strength, and elastic modulus of charcoal briquettes (the coefficient of determination R2 value is close to one). At the same time, it is inversely proportional to its calorific value. The highest density, compressive strength, and elastic modulus are in the 45% adhesive composition, namely 0.818 g/cm3, 3.6188 MPa, and 95.281 MPa, while the highest calorific value of the briquettes is in the 5% adhesive composition, namely 6.693 kcal/g. Therefore, the adhesive composition affects the quality of charcoal briquettes in terms of density, compressive strength, elastic modulus, and calorific value. However, the balance of the briquette composition must be considered to obtain ideal briquettes with optimal performance in practical applications. Keywords: density, compressive strength, elastic modulus, calorific value, biomass energy Share Link | Plain Format | Corresponding Author (Susi Rahayu)

142	Material Physics	ABS-30
Impact of Ultrasonication Time on the Electrical Properties of Polyvinyl Alcohol/Zinc Oxide/MXene/Cellulose Nanocrystal Composites for Electronic Applications Rudy Fernandez, Hairul Abral, Ikhwana Elfitri, Hanalde Andre, Muhammad Zikra, Nando Rahmatul Akbar Universitas Andalas Abstract This study investigates the impact of ultrasonication time on the electrical properties of Polyvinyl Alcohol, Zinc Oxyde, MXene, and Cellulose Nanocrystral (CNC) composites for use in electronic devices. The goal was enhance the electrochemical performance of biodegradable materials for sustainanble electronics. Composites were prepared by incorporating MXene and CNC into PVA ZnO matrix, with varying ultrasonication durations. Electrical properties, including current density and specific capacitance, were evaluated using cyclic voltammetry, while structural analysis was performed via Xray diffraction and scanning electron microscopy. The results showed a significant increase in both current density and specific capacitance as ultrasonication time increased, with value reaching 0.2727 A/cm for current density and 0.646 F/g for specific capacitance after 60 minutes of ultrasonication. These improvements were attributed to better nanoparticle dispersion and enhanced charge transport pathways. The findings demonstrate that ultrasonication is an effective method for optimizing the performance of biodegradable composites in energy storage application. Keywords: Cellulose Nanocrystal, Electrical Properties, Energy Storage, MXene, Polyvinyl Alcohol, Ultrasonication, Zinc Oxide Share Link | Plain Format | Corresponding Author (Rudy Fernandez)

143	Material Physics	ABS-286
Synthesis of Copper Cobalt Ferrite CuCoFe_2O_4 as Active Material for Conductive Cotton-Based Supercapacitors Aprilia Pramu Dhita (a*), Rike Yudianti (b), Iwan Sugihartono (a) Abstract A CuCoFe_2O_4-/polypyrrole (CCF/PPy) nanocomposite was synthesized via in-situ polymerization and evaluated as a pseudocapacitive electrode. CCF/PPy delivered a specific capacitance of 158 F/g at 0.1 A/g, a 41% increase over pristine CCF (112 F/g). Cyclic voltammetry revealed enhanced redox activity, and electrochemical impedance spectroscopy showed reduced internal resistance (2.1&#937- Vs 6.4&#937-) . Separately, conductive cotton substrates were fabricated using CNT-based inks (with nanocellulose or SDS) via immersion and drop-casting. Conductivity varied across eight samples (A1-A8), ranging from 0.03 to 0.47 S/cm. Sample A4, prepared with CNT/nanocellulose via drop-casting, achieved the highest conductivity (0.47 S/cm). The results highlight the synergistic contribution of polymer-ferrite nanocomposites and optimized textile substrates for high-performance flexible supercapacitors. Keywords: CuCoFe_2O_4- Polypyrrole- Flexible supercapacitor- Conductive cotton- CNT- Nanocellulose Share Link | Plain Format | Corresponding Author (APRILIA PRAMU DHITA)

144	Material Physics	ABS-293
Pelapisan Baja HSS Menggunakan Ni-Al&#8322-O&#8323- Berbasis Arus Pulsa: Studi Awal di Laboratorium Fisika Material UNJ 1). Cahya Syfaaunnaasi 2). Dr. Umiatin M.Si 3). Prof. Dr. Esmar Budi M.T Universitas Negeri Jakarta Abstract This preliminary study investigates the coating of High Speed Steel (HSS) using a composite material of nickel (Ni) and aluminum oxide (Al&#8322-O&#8323-) through the pulse current electrodeposition method. This technique was chosen due to its ability to produce more uniform coatings and improve the adhesion between the substrate and the coating material. The objective of this project is to evaluate the characteristics of the resulting coating, including surface morphology, thickness, and adhesion strength. The deposition process was carried out at the Materials Physics Laboratory of UNJ using specific pulse current parameters and varied deposition times. Initial results indicate that the pulse current method is effective in forming a Ni-Al&#8322-O&#8323- layer on the HSS surface and has the potential to enhance the wear and corrosion resistance of the material. This study serves as a foundation for the development of high-performance coating materials for machining and tooling applications. Keywords: #bajahigh-speedsteel #aruspulsa #Ni-Al2O3 #pelapisanbaja Share Link | Plain Format | Corresponding Author (Cahya Syfaaunnaasi)

145	Material Physics	ABS-39
Plasma Electrolytic Oxidation of Pure Zirconium in Chromium Containing Electrolyte Juan Carlos Sihotang (a,b), Maman Kartaman Ajiriyanto (b), Anawati (a*) a) Department of Physics, Faculty of Mathematics and Natural Science, Universitas Indonesia, Depok, 16424, Indonesia *anawati[at]sci.ui.ac.id b) Research Center for Nuclear Material and Radioactive Waste Technology, National Research and Innovation Agency, Serpong, 15314, Indonesia Abstract Plasma Electrolytic Oxidation (PEO)&#8239-is an effective surface modification technique for producing oxide coatings on metal substrates. Various types of particle additives are commonly added to the electrolyte to enhance the properties of the resulting coatings. In this study, chromium (Cr) was incorporated into the PEO coating on pure zirconium (Zr) by introducing a dissolved Cr-containing additive into the electrolyte. The PEO treatment was conducted in an electrolyte composed of 30 g/L NaAlO2, 30 g/L KOH, 10 g/L ethanol, and 10 g/L K2CrO4, at a current density of 50 mA/cm2 for durations of 3, 5, and 10 min. The electrolyte temperature was maintained at 10C. The surface morphology and elemental composition of the coatings were analyzed using scanning electron microscopy (SEM). The phase composition was determined through X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). Electrochemical performance was evaluated using potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS). The coating thicknesses for the samples treated for 3, 5, and 10 min were 3.10, 5.91, and 6.55 micrometer, respectively. XRD analysis revealed that the dominant phase was tetragonal ZrO2. Energy-dispersive X-ray spectroscopy (EDS) confirmed the presence of Cr in the oxide layer, with Cr content increasing with treatment duration, reaching 2.73 atomic percent after 10 min. The presence of Cr was further verified by XPS, which indicated that Cr was likely present in the form of its oxides. Interestingly, the PDP results showed that the coating formed after 5 minutes of treatment exhibited the best corrosion resistance, with a corrosion current density of 2.437 x 10-10 A/cm2. Further detailed results and discussions are presented in the full paper. Keywords: Plasma Electrolytic Oxidation, zirconium, corrosion resistance Share Link | Plain Format | Corresponding Author (Juan Carlos Sihotang)

146	Material Physics	ABS-296
Reduksi Nilai SAR pada Frekuensi 900 MHz 4G Menggunakan Komposit Karbon-Nikel-Resin dengan Sistem DASY8 Muhamad Ridwan Arifin, Marisa Ulfa, M.Si, Nanang Kurniawan 1) Universitas Negeri Jakarta 2) Balai Besar Pengujian Perangkat Telekomunikasi (BBPPT) Abstract Kegiatan Praktik Kerja Lapangan (PKL) ini dilaksanakan di Laboratorium Specific Absorption Rate (SAR), Balai Besar Pengujian Perangkat Telekomunikasi (BBPPT), dengan fokus pada upaya reduksi nilai SAR pada frekuensi 900 MHz yang digunakan dalam jaringan 4G LTE. Penelitian dilakukan dengan mengembangkan material komposit berbasis karbon, nikel, dan resin epoksi, yang berfungsi sebagai pelindung terhadap radiasi elektromagnetik. Uji eksperimen dilakukan menggunakan sistem DASY8, dengan dua skenario pengujian yaitu tanpa dan dengan penggunaan material komposit. Hasil pengujian menunjukkan bahwa material komposit mampu menurunkan nilai SAR rata-rata dari 0,4094 W/kg menjadi 0,3588 W/kg, atau terjadi penurunan sebesar 12,36%. Perbandingan ini menjadi signifikan karena pada jaringan 4G, perangkat lebih sering terpapar radiasi akibat penggunaan data yang tinggi seperti streaming, navigasi, dan konektivitas konstan, jika dibandingkan dengan jaringan 2G yang umumnya hanya digunakan untuk panggilan dan SMS. Oleh karena itu, material ini dikembangkan untuk mereduksi paparan radiasi pada teknologi seluler modern. Selain itu, material komposit ini juga memiliki potensi untuk diaplikasikan sebagai lapisan pelindung pada casing handphone, guna meningkatkan perlindungan pengguna dari paparan radiasi secara langsung. Diharapkan penelitian ini dapat memberikan kontribusi dalam desain perangkat telekomunikasi yang lebih aman dan sesuai dengan batas ambang SAR yang ditetapkan secara internasional. Keywords: pecific Absorption Rate (SAR), 4G LTE, Material Komposit, Radiasi Elektromagnetik, DASY8 System, Casing Handphone Share Link | Plain Format | Corresponding Author (Muhamad Ridwan Arifin)

147	Material Physics	ABS-48
Methods for Improving Mechanical Properties of Composite Solid Propellants Aprilia Fitri Yastuti (a*, b), Ariadne L. Juwono (a), Heru Supriyatno (b), Dwi Setyaningsih (b), Yulia Azatil Ismah (b), Arbela Dani Budisusilo (b) a) Departement of Physics, Faculty of Mathematics and Natural Sciences, Universitas Indonesia, Depok, 16424, Indonesia *aprilia.fitri[at]ui.ac.id- apri012[at]brin.go.id b) Research Center for Rocket Technology, National Research and Innovation Agency, Bogor, 16350, Indonesia Abstract Research and development of solid rockets have been actively conducted in Indonesia since the 1960s, both for civilian and defence purposes. One of the main focuses in enhancing solid rocket performance is the improvement of composite solid propellants used as fuel. A key factor influencing the performance of these propellants is the mechanical properties of the propellant grains. This paper presents a review of various studies that have investigated methods to enhance the mechanical characteristics of composite solid propellants, including modifications to binder systems, oxidizer formulations, and the use of specific additives. The reviewed literature highlights a range of strategies aimed at improving performance and reducing the risk of mechanical failure. Despite notable progress, several challenges remain in translating these findings into practical applications. The review also identifies knowledge gaps and suggests potential directions for future research to develop more robust and mission-specific propellant formulations. Keywords: Composite solid propellant, Mechanical properties, Propellant grain, Rocket performance, Binder optimization, Additives, Solid rocket development Share Link | Plain Format | Corresponding Author (Aprilia Yastuti)

148	Material Physics	ABS-304
PELAPISAN SUBSTRAT BAJA HSS MENGGUNAKAN LARUTAN Ni-Al2O3 DENGAN TEKNIK ARUS PULSA Dinna Indraswari, Dr. Umiatin, M.Si., dan Prof. Dr. Esmar Budi, S.Si., M.T. Universitas Negeri Jakarta Abstract Pelapisan permukaan logam merupakan salah satu metode penting dalam meningkatkan ketahanan aus dan korosi material. Penelitian ini bertujuan untuk mempelajari proses pelapisan baja HSS (High-Speed Steel), menggunakan larutan komposit Ni-Al2O3 dengan teknik elektrodeposisi arus pulsa. Metode ini dipilih karena mampu menghasilkan lapisan yang lebih seragam dan padat dibandingkan metode arus searah. Proses dimulai dengan persiapan substrat melalui pengamplasan dan pembersihan ultrasonik. Kemudian sampel dicelupkan ke dalam larutan pelapis dan dialiri arus pulsa sebesar 0,3 mA/mm^2 selama 30 menit. Hasil pengamatan menunjukkan peningkatan massa sebesar 0,0005 gram setelah pelapisan yang mengindikasikan terbentuknya lapisan pada permukaan baja HSS (High-Speed Steel). Gelombang arus pulsa yang stabil, diamati melalui osiloskop, turut berperan dalam keberhasilan proses deposisi. Hasil ini menunjukkan bahwa teknik arus pulsa efektif dalam pelapisan komposit Ni-Al2O3 pada substrat HSS, dengan potensi aplikasi yang lebih luas dalam peningkatan performa material teknik. Penelitian lanjutan diperlukan untuk mengkaji struktur mikro dan sifat mekanik lapisan secara lebih mendalam. Keywords: Baja HSS, Elektrodeposisi, Arus Pulsa, Ni-Al2O3, Pelapisan Logam Share Link | Plain Format | Corresponding Author (Dinna Indraswari)

149	Material Physics	ABS-51
Analysis of Capacitance Resistance Membran Polymethylmetacrylate-Mesogen Reactive Diacrylate Afrizala*, Yusmaniara, Setia Budia, Asep Riswokob, Teguh Budi Prayitnoc, Karin Khairunnisa Gumilara a Department Chemistry, Faculty of Mathematics and Sciences, Universitas Negeri Jakarta, Jakarta, Indonesia b Sentra Teknologi Polimer, Badan Riset dan Inovasi Nasional Republik Indonesia, South Tangerang, Banten, Indonesia c Department Physics, Faculty of Mathematics and Sciences, Universitas Negeri Jakarta, Jakarta, Indonesia Abstract Membrane composite polymer liquid crystal of Polymethyl Methacrylate with Mesogen Reactive Diacrylate (PMMA-RMDiacrylate) has been successfully synthesized. This research report of the synthesized and characterizations of PMMA-RMDiacrylate and analysis of capacitance and resistance. The puspose this research is study of capacitance and resistance of membrane composite polymer PMMA-RMDiacrylate for membrane electrolyte in fuel cell system. Synthesized membrane composite polymer of PMMA-RMDiacrylate using methods of UV exposure to polymer solutions and addition of a Benzoyl Peroxide (BPO) initiator. Membrane composites polymer PMMA-RMDiacrylate were made with RM257 weight percent variations of 20%, 30%, and 40%. Membrane composite polymer PMMA-RMDiacrylate was characterized by FTIR that absorption peaks appear at wave numbers 2927 cm-1 indicating the-CH3 functional group, 1722 cm-1 indicating the C=O functional group, 1602 cm-1 indicating the presence of aromatic groups, 1248 cm-1 indicating the C-O-C group, 1060-1144 cm-1 indicating the C-O functional group. Texture and morphology analysis of membrane composite polymer of PMMA-RMDiacrylate showed effect of variations concentrations of RMDiacrylate. Analysis crystallinity by XRD results showed that the composite membrane polymer PMMA-RMDiacrylate is semicrystalline and sharp peaks appear as an indicator of phase crystallinity in the PMMA-RMDiacrylate membrane. Electrical properties of composite membrane of PMMA-RMDiacrylate using an LCR meter shows an increase in capacitance, resistance in sensors with 30% and 40% RMDiacrylate variations showed a decrease. It can be seen that the increasing concentration of RMDiacrylate in membrane composite polymer of PMMA-RMDiacrylate has good electrical properties. Keywords: methyl methacrylate- reactive mesogen RMDiacrylate- membrane composite polymer- capacitance- resistance Share Link | Plain Format | Corresponding Author (Afrizal Afrizal)

150	Material Physics	ABS-54
Analisis Energi Gap Film Tipis Ba0,875Sr0,125TiO3 di atas Substrat Kaca Indium Tin Oxide (ITO) dan Substrat Si (100) Tipe P Ahmad Fakhrudin (1*), Sarmilah (1), Novia Fransiska Simbolon (1), Dea Widiawati (1), Renny Apriani Dwika Saputri (1), Habibah Assa^addah (1), dan Irzaman (1) 1) Departemen Fisika, FMIPA, IPB University, Bogor, Indonesia, 16680 * fakhrudinahmad[at]apps.ipb.ac.id Abstract Abstrak. Lapisan tipis Ba0,875Sr 0,125TiO3 di atas substrat kaca Indium Tin Oxide (ITO) dan Substrat Si (100) Tipe P telah berhasil dibuat dengan metode Chemical Solution Deposition (CSD) dengan kelarutan 0,5 M yang dibantu dengan spin coating 3000 rpm, dan annealing pada temperatur 550&#8451- dengan kelajuan suhu 100 &#8451-/jam yang ditahan selama 16 jam dan suhu pendinginan hingga suhu kamar. Substrat kaca Indium Tin Oxide (ITO) dengan ketebalan kaca 1,1 mm, resistivitas ~20 ohm/sq dan resistivitas Si Tipe P ~10 ohm/sq. Lapisan tipis ini diuji sifat optiknya menggunakan Spektrofotometer UV-Vis dengan rentang 230-850 nm dan menghasilkan celah energi sebesar 2,06 eV di atas substrat ITO dan celah energi sebesar 2,4 eV di atas substrat Si (100) Tipe P. Analisis celah energi film tipis Ba0,875Sr 0,125TiO3 di atas substrat kaca Indium Tin Oxide (ITO) dan di atas substrat Si (100) tipe P sangat penting dilakukan karena film ini merupakan cikal bakal sensor suhu . Keywords: Analisis energi gap- Film tipis- Ba0,875Sr0,125TiO3- Substrat ITO- Substrat Si (100) Share Link | Plain Format | Corresponding Author (Ahmad Fakhrudin)

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