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All Journal Jurnal Fisika Unand JRST (Jurnal Riset Sains dan Teknologi)
Nurul Imani Istiqomah
Universitas Gadjah Mada
Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Earth & Planetary Sciences Electrical & Electronics Engineering Energy Engineering Materials Science & Nanotechnology Physics

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Struktur Kristal dan Sifat Kemagnetan Nanopartikel Mn-Ferrite yang Disintesis dari Bahan Alam Pasir Besi Heri Kiswanto; Abdul Hakim Prima Yuniarto; Nurul Imani Istiqomah; Edi Suharyadi
Jurnal Fisika Unand Vol 10 No 4 (2021)
Publisher : Universitas Andalas

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1152.909 KB) | DOI: 10.25077/jfu.10.4.413-420.2021

Abstract

Nanopartikel Mn-Ferrite berbasis bahan alam pasir besi telah berhasil disintesis dengan metode kopresipitasi. Penelitian ini bertujuan untuk memperoleh nanopartikel Mn-Ferrite dari pasir besi dan menganalisis struktur kristal serta sifat kemagnetannya. Sampel disintesis dengan memvariasikan konsentrasi NaOH yaitu 3 M, 6 M, dan 9 M. Karakterisasi sampel dilakukan dengan X-ray diffractometer (XRD), tunneling electron microscopy (TEM), dan vibration sample magnetometer (VSM). Pola XRD menunjukkan bahwa nanopartikel Mn-ferrite telah berhasil disintesis yang ditandai dengan munculnya puncak difraksi khas spinel ferit. Pola XRD juga mendeteksi beberapa puncak difraksi lain yang diidentifikasi sebagai α-Fe2O3 (hematite). Parameter kisi ditemukan meningkat dari 8,32 hingga 8,38 Å seiring dengan meningkatnya konsentrasi NaOH. Ukuran kristalit diestimasi dengan persamaan Scherrer yang ditemukan antara 20 hingga 26 nm. Hasil TEM menunjukkan sampel mengalami aglomerasi akibat interaksi magnetik serta tingginya tegangan permukaan antar-butir nanopartikel. Kurva histeresis magnetik menunjukan bahwa sampel bersifat soft-magnetic. Magnetisasi saturasi terukur antara 11,2 emu/gram hingga 12,5 emu/gram, sedangkan koersivitas antara 98 Oe hingga 106 Oe. Hal ini dipengaruhi oleh keberadaan fase impuritas yang bersifat anti-ferromagnetik dengan persentase berbeda-beda untuk masing-masing sampel.
The Role of Green-Synthesized Fe3O4/Ag Magnetic Nanoparticle Masses on the Specific Absorption Rate toward Magnetic Hyperthermia Applications Dhel Prisca Daro Kowe; Mahardika Yoga Darmawan; Nurul Imani Istiqomah; Edi Suharyadi; Nur Aji Wibowo
JRST (Jurnal Riset Sains dan Teknologi) Volume 9 No. 2 September 2025: JRST
Publisher : Universitas Muhammadiyah Purwokerto

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30595/jrst.v9i2.22884

Abstract

With chemotherapy and radiation therapy being the most common cancer treatments today, there are questions about their effectiveness and risks.Therefore, an alternative method that does not have significant side effects is needed, such as magnetic hyperthermia therapy (HM).The mass of magnetic nanoparticles (MNP) and the coating of MNP as anti-cancer agents play a very important role in optimizing the HM method, characterized by the Specific Absorption Rate (SAR) value.This study examines the effect of the mass of iron oxide magnetic nanoparticles with a silver coating (Fe3O4/Ag) on the Specific Absorption Rate (SAR) value. MNP Fe3O4/Ag was synthesized using the green synthesis (GS) method with Moringa oleifera (MO) plant extract.The results of this study show that GS-NPM Fe3O4/Ag has a crystal size between 42.69 - 43.58 nm with a bandgap energy of 2.50 eV, and contains functional groups O-H, C-H, N-Ag, Fe-O, and Fe-O-Si.There was a temperature change in the NPM Fe3O4/Ag for all mass variations, ranging from 0°C to 14.2°C over a period of 600 seconds, using a frequency of 15 kHz and an alternating magnetic field amplitude of 150 Oe.This temperature change indicates that the greater the mass of the NPM sample, the higher the NPM temperature. The lowest and highest SAR values obtained, consecutively, were 0.43 W/g at a mass of Fe3O4/Ag 0.125 grams and 1.11 W/g at a mass of 0.025 grams.
Co-Authors Abdul Hakim Prima Yuniarto Dhel Prisca Daro Kowe Edi Suharyadi Heri Kiswanto Mahardika Yoga Darmawan Nur Aji Wibowo