Sifat Magneto-Elastisitas Ferogel dengan Filler Magnetik Fe3O4 yang Disintesis dari Batuan Besi

Nadya Mayestika, Astuti Astuti

Abstract


Sintesis Fe3O4 sebagai filler material magnetoelastik ferogel dari batuan besi menggunakan metode kopresipitasi telah dilakukan. Ferogel disiapkan dari campuran PVA, air, dan gliserin sebagai matriks. Variasi massa filler yang diberikan yaitu 20%, 25%, dan 30%. Ferogel disintesis menggunakan metode freezing-thawing (beku-cair). Karakterisasi fasa dan ukuran kristal Fe3O4 menggunakan XRD (X-Ray Diffractometer). Karakterisasi morfologi dan ukuran partikel Fe3O4 menggunakan SEM (Scanning Electron Microscopy). Karakterisasi sifat magneto-elastisitas ferogel dilakukan dengan menguji pemuluran dan simpangannya ketika dipengaruhi medan magnet. Nilai suseptibilitas magnetik ferogel diukur menggunakan Bartington MS2 Magnetic Susceptibility Meter. Hasil analisis XRD menunjukkan pola difraksi serbuk batuan besi yang sesuai dengan pola difraksi Fe3O4 sebesar 83% dari volume total dengan ukuran kristal sekitar 26,68 nm–78,08 nm. Hasil SEM menunjukkan distribusi partikel yang tidak merata dengan ukuran partikel Fe3O4 sekitar 33,47 nm–59,09 nm. Pemuluran dan simpangan meningkat seiring bertambahnya konsentrasi filler. Simpangan dan pemuluran terbesar berturut-turut yaitu 4,5 cm dan 1,8 cm oleh ferogel dengan filler 30%. Nilai suseptibilitas ketiga sampel berturut-turut yaitu (815,2; 434,1; 970,2) ×10-8m3kg-1. Berdasarkan hasil karakterisasi, ferogel yang dihasilkan mempunyai tingkat sensitifitas yang tinggi terhadap medan magnet. 

 

Synthesis of Fe3O4 as filler of ferrogel magnetoelastic materials from iron rocks has been conducted by using coprecipitation method. Ferrogel was prepared by mixing PVA, water, and glycerin as its matrix. Variations of filler mass were 20%, 25%, and 30%. Ferrogel was synthesized by using freezing-thawing method. Phase and crystal size of Fe3O4 were characterized by using XRD (X-Ray Diffractometer). Morphology and particle size of Fe3O4 were characterized by using SEM (Scanning Electron Microscopy). Magneto-elasticity properties of ferrogel were characterized by testing its elongation and distortion under the effect of the magnetic field. The values of magnetic susceptibility were measured by Bartington MS2 Magnetic Susceptibility Meter. The results of XRD show that diffraction patterns of iron rocks powders were matched to Fe3O4 patterns that was 83% of total volume and having a crystal size about 26.68 nm–78.08 nm. The results of SEM indicated that particles distribution is not uniform with Fe3O4 particle size is about 33.47 nm–59.09 nm. The elongation and distortion are equal with increasing concentration of filler. The highest elongation and distortion respectively are 4.5 cm and 1.8 cm by ferrogel with 30% filler. The results of magnetic susceptibility respectively are (815.2; 434.1; 970.2) ×10-8m3kg-1.


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DOI: https://doi.org/10.25077/jfu.9.1.53-59.2020

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