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All Journal Jurnal Sains dan Seni ITS Jurnal Penelitian Fisika dan Aplikasinya (JPFA) JFA (Jurnal Fisika dan Aplikasinya) Jurnal Pengabdian Kepada Masyarakat (Indonesian Journal of Community Engagement) Journal of Physics: Theories and Applications Jurnal Pengabdian Ilung (Inovasi Lahan Basah Unggul) Sewagati

Zainuri (DOI: 10.12962/j24604682.v12i2.1331), Mochamad

Departemen Fisika, Fakultas Matematika Dan Ilmu Pengetahuan Alam, Institut Teknologi Sepuluh Nopember

Author-ID : 2780594

Agriculture, Biological Sciences & Forestry Arts Humanities Astronomy Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Decision Sciences, Operations Research & Management Dentistry Earth & Planetary Sciences Economics, Econometrics & Finance Education Energy Engineering Environmental Science Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Medicine & Pharmacology Nursing Physics Public Health Social Sciences Other

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Studi Sifat Mekanik Komposit Isotropik Al/SiO2 Hasil Fabrikasi dengan Metalurgi Serbuk Hanafi, Hanafi; Munasir, M; Zainuri (DOI: 10.12962/j24604682.v12i2.1331), Mochamad
Jurnal Fisika dan Aplikasinya Vol 12, No 2 (2016)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Telah dilakukan pembuatan komposit Al/SiO2 melalui metode metalurgi serbuk dengan menggunakan aluminium sebagai matrik yang digabungkan dengan nano silika (SiO2) yang diperoleh dari hasil sintesis pasir Bancar Tuban melalui metode kopresipitasi. Fabrikasi komposit dilakukan dengan metode metalurgi serbuk pencampuran basah, dengan medium pencampur berupa larutan butanol, dan disintering pada temperatur 500C selama 2 jam dalam furnace vakum. Hasil fabrikasi dilakukan beberapa analisis dan uji untuk mengetahui sifatsifatnya,seperti densitas dan porositas, serta uji menggunakan XRD, SEM-EDX dan uji tekan (Brinnel). Hasil penelitian menunjukkan bahwa dari analisis XRD diperoleh komposit Al/SiO2 pada x = 0% hingga 30% dengan fase kristal berupa Al dan sedikit Al2O3 dan SiO2 yang ditunjukkan oleh puncak difraksi yang rendah. Peningkatan fraksi volume SiO2 pada komposit cenderung menurunkan densitas dan meningkatkan porositas. Demikian pula dari hasil uji mekanik, kuat luluh (Yield Strength (YS), kuat tekan (CS), kuat tekan maksimum (UCS) dan modulus elastis (ME) serta kekerasan bahan (BHN) cenderung mengalami penurunan dengan bertambahnya fraksi volume SiO2 diatas 5% pada komposit Al/SiO2. Nilai YS, CS, ME dan kekerasan bahan memiliki nilai tertinggi ketika fraksi volume SiO2 dalam komposit adalah 5%.AbstractComposites of Al/SiO2 have been fabricated through powder metallurgy method using aluminium as matrix and combined with nano silica (SiO2). SiO2 was obtained from the synthesis of sand of Bancar Tuban throughcopresipitation method. Fabrication of composites was performed byÂ powder metallurgy method by the wet mixing method, by using butanol as solution. The sample was sintered at a temperature of 500C for 2 hours ina vacuum furnace. The samples were analyzed and tested to determine its properties, as density, porosity, and tested by XRD, SEM-EDX and pressure test. The results showed that based on the XRD analysis was obtainedcomposite Al/SiO2 at x= 0% to 30% with a crystalline phase of Al and Al2O3 and SiO2 slightly indicated by a low peak. Increased of the volume fraction of SiO2 on composite was tended to decrease of density and increase porosity. The results of mechanical tests was show that yield strength (YS), compressive strength (CS), elastic modulus (EM), hardness tends to decrease with increasing volume fraction of the composite of SiO2. Value YS, CS, EM and hardness of materials has the highest value when the volume fraction of SiO2 in the composite is 5%.

Crystal Structure and Magnetic Properties of Zn doped Barium M-Hexaferrite Nuraini, Umi; Amalia, Lita; Rosyidah, Kurniawati C.; Zainuri, Mochamad
Jurnal Fisika dan Aplikasinya Vol 10, No 3 (2014)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Synthesis of Zn doped Barium M-Hexaferrite (BaFe12âˆ’xZnxO19) has been performed by coprecipitation method. The purified iron sand from Tulungagung is used as a precursor of Fe3O4. Synthesis of Zn doped Barium M-Hexaferrite with variations of x = 0.3, 0.5, and 0.7 has been calcined at temperatures of 1000Cfor 5 hours. Ion Zn2+ (with 0 x 0.7 wt %) does not change the crystal structure of Barium M-Hexaferrite (BaM), but give a slight displacement of the peak position of the diffraction pattern. SEMfigures showed that Zn doped Barium M-Hexaferrite have a hexagonal structure, similar to BaM structure. Doping of Zn has changed the magnetic properties of Barium M-Hexaferrit (BaM), from hard magnetic become soft magnetic. Barium M-Hexaferrit (BaM) has a value of Coercivity Field (Hc) and Remanence Magnetization (Mr) is 0.03734 T and 8.334 emu/g. At variation x = 0.3, the Remanence Magnetization (Mr) reaches the highest value. At this point, a value of Coercivity Field (Hc) and Remanence Magnetization (Mr) is 0.0506 T and 14.782 emu/gram respectively.

Efek Staebler-Wronski dan Pengaruh Waktu Anil pada Lapisan Instrinsik Silikon Amorf Terhidrogenasi (a-Si:H) Yoyok Cahyono; Fuad D. Muttaqin; Umi Maslakah; Malik A. Baqiya; Mochamad Zainuri; Eddy Yahya; Suminar Pratapa; Darminto Darminto
Jurnal Fisika dan Aplikasinya Vol 13, No 2 (2017)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Silikon amorf terhidrogenasi (a-Si:H) adalah salah satu material sel surya yang sangat menjanjikan, karena jika dibandingkan dengan kristal silikon (c-Si) material ini mempunyai absorpsivitas yang lebih besar dengan kebutuhan material yang lebih sedikit (tipis). Sehingga diharapkan dapat mereduksi biaya produksi dan hargasel surya. Tetapi sampai saat ini masih banyak persoalan yang belum terselesaikan, terutama yang berkaitan dengan efisiensi yang masih rendah, dan efek Staebler-Wronski. Penelitian ini bertujuan untuk mempelajari efek Staebler-Wronski, yaitu pengaruh lama waktu paparan panas pada lapisan material sel surya dengan menggunakan cara perlakuan anil. Hasil penelitian menunjukkan bahwa semakin lama waktu anil, ada kecenderungan untuk menurunkan transmitansi, yang diperkirakan disebabkan oleh perubahan kristalinitas, celah pita energi, energi Urbach dan ukuran partikel. Kenaikan waktu anil dapat mengakibatkan terlepasnya ikatan hidrogen yangmenyebabkan terjadinya peningkatan keadaan terlokalisasi, karena aktivasi ikatan lepas, dan ikatan lepas inilah penyebab utama terjadinya efek Staebler-Wronski.ABSTRACTHydrogenated amorphous silicon (a-Si:H) is one of the most promising solar cell materials, as compared to the crystalline silicon (c-Si). This material has a greater absorption with less material requirement (thin). So it is expected to reduce the cost of production and price of solar cells. But until now there are still many unresolvedissues, especially with regard to low efficiency, and the Staebler-Wronski effect. This study aims to describe the effect of Staebler-Wronski, which is the effect of long-time exposure to heat on the layer of solar cell material by means of annealing treatment. The results show that the longer annealing time, there is a tendency to decreasetransmittance, which is thought to be caused by changes in crystallinity, energy band gap, Urbach energy and particle size. The increasing annealing time can lead to the release of hydrogen bonds that cause an increase in localized state, due to the activation of the dangling bond which is the main cause of the Staebler-Wronskieffect.

Variasi tekanan dalam proses metalurgi serbuk dan pengaruhnya pada modulus elastisitas bahan komposit Al-SiC Mochamad Zainuri; Yoni Moniada; Darminto Darminto
Jurnal Fisika dan Aplikasinya Vol 1, No 1 (2005)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Preparasi bahan komposit bermatriks logam Al dengan penguat SiC telah dilakukan dengan menerapkan gaya kompaksi sebesar 15, 20 dan 25 kN dalam proses metalurgi serbuk. Kompaksi dengan tekanan yang lebih besar daripada kekuatan luluh Al menyebabkan penurunan kualitas ikatan permukaan, sebagai akibat terjebaknya gas dan bahan pelumas yang digunakan dalam proses fabrikasi. Kualitas terbaik dari ikatan antar permukaan antara bahan matriks dan penguat dicapai oleh sampel yang disiapkan dengan gaya kompresi sebesar 15 kN, dengan nilai modulus Young yang terletak di antara batas upper dan lower bound. Analisis selanjutnya dengan modelpartikel penguat menggunakan geometri tabung dan kubus untuk komposit isotropik dapat memprediksi nilai modulus elastisitasnya yang sesuai dengan hasil eksperimen.

Analisis Silika (SiO2) Hasil Kopresipitasi Berbasis Bahan Alam menggunakan Uji XRF dan XRD Linda Silvia; Mochamad Zainuri
Jurnal Fisika dan Aplikasinya Vol 16, No 1 (2020)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v16i1.5322

Synthesis process of silica (SiO2) from Bancar sand has been carried out by coprecipitation method using NaOH. This study tried to obtain high purity silica from the natural resources by analyzing it using the Rietveld method. Experiments are conducted with different training. Study of X-ray Fluorescence (XRF) analysis showed that Bancar sand was used containing a silica composition weight of 81.7%. X-ray Diffraction (XRD) pattern proves that the synthesized SiO2 formed is amorphous silica, but is still a crystal structure, so that amorphous silica has not yet been formed as a whole. SiO2 content obtained showed high purity using the Rietveld method proved by GoF < 4%. By using MAUD software was obtained silica from coprecipitation methods have particle size were 98.4 ± 57.7 nm.

Effects of The Addition of Carbon on Abaca Fiber and PVA Composite Materials Based on Mechanical and Acoustic Properties Susilo Indrawati; Syabania R A; Linda Silvia; Lila Yuwana; Mochamad Zainuri
Jurnal Fisika dan Aplikasinya Vol 19, No 1 (2023)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v19i1.14534

Abaca is a kind of banana that grows in Indonesia. Abaca banana product utilized in this research is a fiber that obtained from the midrib of the stem. Henceforth, abaca fiber is processed to be the form of membranes. The purpose of the study are to determine the physical, mechanical and acoustic properties of abaca fiber composite materials as fillers and polyvinyl acetate (PVA) as a matrix. The ratio of composite materials of abaca fibers and PVA is 1:10. The variations used in producing membranes are the addition of carbon powders by 0%, 2%, 4%, 6% and 8%. The characteristics carried out include testing of density, morphology, tensile strength and sound absorption coefficient. The results reveal that the highest density is obtained from the sample of 0% carbon, i.e., 1.026 gr/cm3. Furthermore, the mechanical properties testing shows the highest yield stress value in samples with 4% carbon of 476.8 MPa and the highest Young modulus in samples with 8% carbon is 7905.1 MPa. Therefore, the addition of carbon could improve the mechanical properties of composites materials. Based on the measurement of sound absorption coefficient using an impedance tube with 1 microphone, the highest value can be attained from the sample of 4% carbon, namely 0.211 which shows the sample is more reflective. The material is reflective because the amount of abaca fiber used is less than PVA. The diameter of pores formed between the fiber and PVA are very small which could cause the absorption coefficient value to be lower. Therefore, further research will focus on the addition of abaca fiber content in composite materials. The positive point in this study is that the addition of carbon with 4% and 8% provides optimal mechanical ability.

Synthesis of Silica from Rice Husk Waste for Hydrophobic Material as an Anti-Water Coating for Eyeglasses Phahul Zhemas Zul Nehan; Ahmad Ali Akbar; Muhammad Ilham Nur Karim; Raychan Abyqa Fahriza; Mochamad Zainuri
Jurnal Fisika dan Aplikasinya Vol 19, No 2 (2023)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12962/j24604682.v19i2.15721

Hydrophobic materials made of silica as a coating for glasses are very attractive. The synthesis of silica (SiO2) from rice husk ash was successfully carried out using the sol-gel method. The hydrophobic silica composition is made with four variations of silica, consisting of 0.5, 1.0, 1.5, 2.0 g and polydimethylsiloxane (PDMS) keep constant in 20 g. The raw material was first characterized by X-ray Fluorescence (XRF) to investigate element composition. Then, silica powder obtained from rice husk ash was characterized by Fourier Transform Infrared Spectroscopy (FTIR), Particle Size Analyzer (PSA) and Water Contac Angel (WCA) were employed to investigate functional groups material, size of particles and hydrophobicity of the prepared samples for coating glass. The result of contact angel from coating glass exhibited more than 90◦ and the maximum hydrophobicity properties of polydimethylsiloxane/silica (PDMS/SiO2) was about 111.40◦ for the silica composition of 2 g.

Co-Authors Adhita Ferbi Irawati Agus Purwanto Agus Purwanto Agus Purwanto Agus Purwanto Agus Purwanto Ahmad Ali Akbar Amalia, Lita Ariza Noly Kosasih Arum Puspita Sari Astuti, Fahmi Badri G.S Bayu Prasetya Bintoro Anang Subagyo Cahyono, Yoyok Darminto Darminto Darminto Darminto Darminto Darminto Darminto Darminto Darminto Darminto Darminto Darminto Darminto Deril Ristiani Dessy Putri Efhana Devi Eka Septiyani Arifin Dita Viantyas Dwi Ratna Setya Pambudi Eddy Yahya Endarko Endarko Fahmi Astuti Findah Rahmawatus Sholihah Fuad D. Muttaqin Halley Henriono Hanafi, Hanafi Heny Faisal Inayati Nur Saidah Intifadhah, Sahara Hamas Kharisma Permatasari Khoirotul Yusro Lian Nunisa Usvanda Lila Yuwana Linda Silvia Linda Silvia, Linda Malik Anjelh Baqiya Masyitatus Daris S Mauliana, Metatia Intan mochamad zainul Asrori Muhammad Ilham Nur Karim Muhammad Rizki Alfirdaus Munasir, M Nurul Amalia T Nurul Amalia Triyuliana Pelangi Az-zahra Phahul Zhemas Zul Nehan Raychan Abyqa Fahriza Roihatur Rohmah Rosyidah, Kurniawati C. Santi Puspitasari Sriyani Purwaningsih Suasmoro Suasmoro Sukamto, Heru Suminar Pratapa Susilo Indrawati Susmita Rachmawati Syabania R A Triwikantoro Triwikantoro Umi Maslakah Umi Nuraini, Umi Vera Laviara Maghfirohtuzzoimah Wantana Klysubun Yanurita Dwihapsari, Yanurita Yoni Moniada Zainal Arifin

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