Article Per Year (5 Year)
p-Index From 2020 - 2025
2.064
P-Index
This Author published in this journals
All Journal Jurnal Zarah JPSE (Journal of Physical Science and Engineering) Jurnal Gema Ngabdi Bima Abdi: Jurnal Pengabdian Masyarakat Jurnal Warta Desa (JWD) Jurnal Pijar MIPA Hexagon
Yanuar, Emsal
Universitas Teknologi Sumbawa
Agriculture, Biological Sciences & Forestry Humanities Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Education Electrical & Electronics Engineering Environmental Science Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Mathematics Physics Social Sciences Other

Published : 14 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 14 Documents
Search

 1   2 
Fabrication of Fe3O4/PEG 4000/Oleic Acid Ferrofluids on Crystal Structure and Magnetic Properties Using Rhee Sumbawa Iron Sand Bahtiar, Syamsul; Islam, Izzul; Jayatri, Adella Ulyandana; Widyawati, Fauzi; Yanuar, Emsal
Jurnal Pijar Mipa Vol. 20 No. 1 (2025)
Publisher : Department of Mathematics and Science Education, Faculty of Teacher Training and Education, University of Mataram. Jurnal Pijar MIPA colaborates with Perkumpulan Pendidik IPA Indonesia Wilayah Nusa Tenggara Barat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jpm.v20i1.8108

Abstract

The fabrication of ferrofluid using Fe3O4 nanoparticles synthesized from Rhee Sumbawa iron sand has been successfully carried out. This fabrication was conducted to study the crystal structure characteristics and magnetic properties of the ferrofluid from Rhee iron sand. The fabrication used the co-precipitation method at room temperature to synthesise Fe3O4 nanoparticles. In contrast, the ferrofluid fabrication employed a magnetic stirrer with the addition of PEG 4000/Oleic Acid as a surfactant. The structure and magnetic characteristics of the Fe3O4/PEG 4000/AO ferrofluid will be investigated in this work. The results of the XRF characterization show an Fe content of 91.73%, indicating that the purity of Fe has been successfully increased using a permanent magnet separation method. The XRD characterization results show the formation of a cubic crystal system with lattice parameters a=b=c = 9.3797 Å, α=β=γ = 90°, and the crystal size obtained from the refinement is 8.42 nm. The TEM characterization results indicate that the morphology of the nanoparticles is spherical with a particle size of 7.34 nm. The VSM characterization results obtained the ferrofluid magnetization value in the 0.08–0.34 emu/g range.
PENGARUH PERSEN PADATAN DAN PENGGUNAAN OKSIDATOR H2O2 PADA PEROLEHAN KEMBALI EMAS DARI TAILING AMALGAMASI MENGGUNAKAN METODE KLORINASI BASAH Khairy, Kholida Tul; Sahrind, Muhammad; Bahtiar, Syamsul; Widyawati, Fauzi; Yanuar, Emsal; Suhaimi, Lalu
Hexagon Vol 6 No 1 (2025): HEXAGON - Edisi 11
Publisher : Fakultas Teknologi Lingkungan dan Mineral - Universitas Teknologi Sumbawa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36761/hexagon.v6i1.5357

Abstract

The leaching of gold from amalgamated tailings using the wet chlorination method has been successfully carried out. In this study, the gold leaching process was undertaken with percent solids varying at 10%, 15%, 20%, and 25% by using 30% H2O2 as an oxidizer. Subsequent leaching with 25% of solids without using 30% H2O2 oxidizer. For other operating conditions, it was kept constant with an operating temperature of 60°C, sample weight of 100 grams, and particle size of 200 mesh. The results showed that the highest gold recovery was 58.68% at 25% of solid. Meanwhile, the lowest gold recovery was 10.94% at 10% of solid. The use of H2O2 has a significant effect on the value of gold recovery, i.e using H2O2 the gold recovery is 58.68% compared to without using H2O2 of 1.15%.
Synthesis of Cellulose from Decorticated Sisal Plants (Agave sisalana) using the Acid Hydrolysis Method Widyawati, Fauzi; Hidayat, Syamsul; Wiradana, Aditya; Setyaningtyas, Ayunda Kinasih; Bahtiar, Syamsul; Yanuar, Emsal
Jurnal Pijar Mipa Vol. 20 No. 3 (2025)
Publisher : Department of Mathematics and Science Education, Faculty of Teacher Training and Education, University of Mataram. Jurnal Pijar MIPA colaborates with Perkumpulan Pendidik IPA Indonesia Wilayah Nusa Tenggara Barat

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jpm.v20i3.8099

Abstract

Sisal Plant Production Process (Agave sisalana) produces waste of around 95%, which is wasted and can be an environmental problem because it is not processed properly. Sisal decortication waste contains active biochemical compounds, one of which is cellulose, which has the potential to be used in various fields. Cellulose is one of the most widely distributed and abundant biopolymers on Earth, as the main source of renewable materials obtained from plant fibers. Initial Treatment of Fiber Alkalization using 5% NaOH solution (1:20) for 2 hours at a temperature of 80 °C at a speed of 200 rpm. Then the bleaching process(bleaching). Samples of the results of alkalization treatment using hydrogen peroxide solution (H2THE23%) at a temperature of 80 °C for 3 hours, repeated once. In the Acid Hydrolysis process, the resulting sample is bleached with acid using sulfuric acid (H2SO465%) at a temperature of 80 °C for 1 hour (1:20). Sample Characterization Fiber characterization using the NDF test to determine cellulose content. The results of the cellulose content test in sisal fiber decortication waste were 1.545 mg/L Based on the results of the study, nanocellulose with a high % crystallinity was successfully extracted from sisal fiber decortication waste using a chemical treatment method. The FTIR spectrum shows a broad band at 3358-3410 cm-1which is the vibration of the OH group of cellulose. The removal of lignin levels was successfully carried out, showing that the peak of the spectrum band produced was only 1279.26 cm-1. The average size of nanocellulose particles is around 10-30 nm and consists of 30-100 cellulose molecules.
BIOSINTESIS LAPISAN TIPIS ZnO MENGGUNAKAN EKSTRAK TEMU KUNCI (BOESENBERGIA PANDURATA) DENGAN METODE SPIN COATING: VARIASI WAKTU PERTUMBUHAN Amalia, Nuri; Yanuar, Emsal; Suhaimi, Lalu
Hexagon Vol 4 No 2 (2023): HEXAGON - Edisi 8
Publisher : Fakultas Teknologi Lingkungan dan Mineral - Universitas Teknologi Sumbawa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36761/hexagon.v4i2.3025

Abstract

ZnO merupakan salah satu material yang banyak dikembangkan oleh peneliti karena sifatnya yang unik seperti fotokatalitik, elektrik, optik, dan antibakteri. Artikel ini memuat penelitian dalam melakukan biosintesis ZnO nanopartikel menggunakan ekstrak temu kunci dengan metode spin coating pada variasi waktu pertumbuhan. Proses diawali dengan pembuatan larutan bibit dengan konsentrasi 0,5M pada temperatur 60? dengan kecepatan 1000rpm selama 60 menit. Selanjutnya, pembuatan lapisan bibit dengan teknik spin coating. Lapisan tipis ZnO nanostruktur ditumbuhkan dengan variasi waktu 3 jam dan 4 jam. Hasil analisis SEM menunjukkan bentuk morfologi ZnO di atas substrat kaca berbentuk spherical dan terjadi aglomerasi pada masing-masing variasi. Ukuran rata-rata butir ZnO pada perlakuan waktu tumbuh 3 jam adalah 88.61 nm dan 4 jam adalah 58.23 nm. Hasil analisis pola XRD menunjukkan bahwa dari masing- masing sampel ZnO memiliki kristalinitas tinggi berbentuk heksagonal, dengan. ukuran kristal pada waktu tumbuh dari 3 jam yaitu 25.8 nm dan 4 jam sebesar 34.4 nm. Nilai Energy gap pada waktu pertumbuhan 3 jam adalah 3.40eV dan 4 jam adalah 3.85 eV. Nilai absorbansi relatif tinggi pada perlakuan 3 jam dengan panjang gelombang 215 dan pada perlakuan 4 jam dengan panjang gelombang 245nm.
Co-Authors Amalia, Nuri Bahtiar, Syamsul Eka Ardiansyah, Eka Eka Putra Ramdhani Fadhli Dzil Ikram Fauzi Widyawati I Putu Widiantara izzul islam Jayatri, Adella Ulyandana Junaidin Junaidin Khairy, Kholida Tul Kiki Firanita Lukmanul Hakim Nova Adhitya Ananda Rahmat Bukahri, La Ode Rita Desiasni Sahrind, Muhammad Sarwana, Wirya sayid zen, sayid muh aidil alkaf Setyaningtyas, Ayunda Kinasih Sudirman Syafitri, Anggun Syamsul Bahtiar Syamsul Hidayat SYAMSUL HIDAYAT Wiradana, Aditya Zulkifli, Zulikifli