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Salomo Sinuraya
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Earth & Planetary Sciences Electrical & Electronics Engineering Energy Materials Science & Nanotechnology Physics

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ANALISA PERUBAHAN SUSEPTIBILITAS MAGNETIK DAN KOMPOSISI PARTIKEL PASIR ALAM SUNGAI ROKAN SEBAGAI FUNGSI KECEPATAN PUTAR TABUNG BALL MILLING Salomo Sinuraya; Erwin Amiruddin; Diah Nurrohmah; Tri Wulandari
Komunikasi Fisika Indonesia Vol 18, No 3 (2021)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.18.3.225-229

Abstract

Telah dilakukan penelitian tentang suseptibilitas magnetik dan komposisi partikel magnetik pasir alam Sungai Rokan, Provinsi Riau sebagai fungsi kecepatan putar tabung ball milling. Sampel dikeringkan terlebih dahulu dibawah sinar matahari sebelum dilakukan pemisahan antara partikel magnetik dengan partikel non magnetik menggunakan Iron Sand Separator, hasil ini disebut dengan produk ISS. Produk ISS di milling dengan kecepatan putaran tabung milling yang berbeda yaitu 100, 150, and 200 rpm dengan bola besi berdiameter 2,0 cm. Produk yang diperoleh dari ball milling kemudian dipisahkan partikel magnetik dan non magnetik  menggunakan magnet Neodimium Iron Boron (NdFeb), hasil ini disebut dengan produk ball milling(produk BM). Hasil penelitian ini menunjukkan bahwa suseptibilitas magnetik produk ISS memiliki nilai 1.930,771 × 10-5, sedangkan nilai suseptibilitas magnetic produk ball milling meningkat seiring dengan kenaikan kecepatan putar tabung, yaitu 28.188,141 × 10-5, 31.136,137 × 10-,5 and 33.123,550 × 10-5 untuk kecepatan putar 100, 150, and 200 rpm. Hasil identifikasi XRF menunjukkan unsur magnetik  Fe meningkat dari 13,777% menjadi 27,064%, sedangkan unsur non magnetik Si mengalami penurunan dari 58,401% menjadi 42,920%.
PENGARUH DOPING CHROMIUM TERHADAP SIFAT KRISTALINITAS DARI NANOPARTIKEL α-Fe2O3 (HEMATITE) Novia Magdalena Purba; Erwin Amiruddin; Salomo Sinuraya; Krisman Sabar
Komunikasi Fisika Indonesia Vol 20, No 2 (2023)
Publisher : Universitas Riau

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31258/jkfi.20.2.141-146

Abstract

This study aims to determine the crystal structure and particle composition as well as the effect of iron oxide nanoparticles (α-Fe2O3) doped chromium for methylene blue degradation. Iron oxide nanoparticles were obtained by 3 stages of ball milling with the total time milling of 120 hours. Each stage of ball milling, the product was process by strong NdFeB magnet uin order to separate between iron oxide and non iron oxide phases. The last product of ball milling process is called BM 3. The BM 3 product was divided into 4 parts with the same amount of weight namely BM 3A, BM 3B, BM 3C, and BM 3D with variations in the concentration of 0 wt.% chromium; 5 wt.%; 10 wt.%; and 20 wt.% These samples were characterized using X-ray diffraction (XRD) method and X-ray fluorescence (XRF). The XRD measurements show that the BM 3 product has a Hematite (α-Fe2O3) phase with a Rhombohedral structure. The crystal size of the samples decreases with increasing chromium concentration. The amount of Fe decreases from 57.316% to 54.204% as  chromium increases from 0 wt.% to 5 wt.% respectively. Meanwhile, the percentage of Cr increases before being doped with 0.08% chromium and then increases after being doped with 5 wt.% chromium to 7.758%.
Co-Authors Diah Nurrohmah Erwin Amiruddin Erwin Amiruddin Krisman Sabar Novia Magdalena Purba Tri Wulandari