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All Journal Jurnal Sains dan Seni ITS JFA (Jurnal Fisika dan Aplikasinya) Jurnal Penelitian dan Pengkajian Ilmu Pendidikan: e-Saintika
Darminto Darminto
Institut Teknologi Sepuluh Nopember (ITS)
Arts Humanities Education Mathematics Physics Other

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Kontribusi Filler Magnetik Fe3O4 pada Efek Histerisis Magneto-Elastisitas Komposit Ferogel Sunaryono Sunaryono; Ahmad Taufiq; Nurdin Nurdin; Darminto Darminto
Jurnal Fisika dan Aplikasinya Vol 9, No 1 (2013)
Publisher : Lembaga Penelitian dan Pengabdian Kepada Masyarakat, LPPM-ITS

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (432.724 KB) | DOI: 10.12962/j24604682.v9i1.837

Abstract

Ferogel berbasis partikel Fe3O4 yang diperoleh dari bahan dasar pasir besi Tulungagung telah berhasil difabrikasi. Ferogel merupakan komposit hidrogel (campuran polivinil alkohol dan air) dengan filler partikel magnetit Fe3O4 dalam ukuran mikron dan nano. Hasil analisis difraksi sinar-X menunjukkan bahwa partikel magnetik Fe3O4 ukuran mikron dan nano berturut-turut sesuai dengan pola difraksi Fe3O4 yang memiliki no PDF 11-0626 dan no PDF 03-0863. Sedangkan dari hasil karakterisasi SEM dan TEM ukuran mikron partikel Fe3O4 sekitar 1-10 μm dan ukuran nano partikel Fe3O4 sekitar 11-15 nm. Kontribusi filler magnetik Fe3O4 pada komposit ferogel dapat terlihat pada karakterisasi magneto-elastisitasnya. Ketika ferogel dipengaruhi oleh medan magnetik luar yang berubah terhadap fungsi arus listrik, respon gerak ferogel cenderung membentuk pola histerisis dan menyempit seiring berkurangnya konsentrasi. Ferogel dengan filler partikel mikron Fe3O4 lebih sensitif terhadap pengaruh perubahan medan magnet dibandingkan filler partikel nano Fe3O4. Hal ini disebabkan karena magnet remanen partikel mikron Fe3O4 (8,233 emu/gr) lebih besar dibandingkan partikel nano Fe3O4 (7,995 emu/gr). Respon ferogel dalam kajian penelitian ini dapat dikembangkan untuk mensintesa otot buatan dengan pendekatan eksperimen mulai dari yang mirip penggerak pada robot sampai pada penggerak lunak yang lebih canggih.
Synthesis and Characterization of ZnO Thin Layers using Sol-Gel Spin Coating Method Sukainil Ahzan; Darminto Darminto; Ferry Anggoro Ardy Nugroho; Saiful Prayogi
Jurnal Penelitian dan Pengkajian Ilmu Pendidikan: e-Saintika Vol. 5 No. 2: July 2021
Publisher : Lembaga Penelitian dan Pemberdayaan Masyarakat (LITPAM)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.36312/esaintika.v5i2.506

Abstract

The potential of thin layer in many applications has led to research on the development of many new materials and their fabrication methods. This study aimed to synthesize a thin layer of ZnO using the facile and low-cost sol-gel spin coating method. The ZnO thin layer is deposited on a glass substrate and analyzed to observe the influence of the deposition variables such as heating and rotation speed, and its aging. The characterization methods include the identification of the formed phase using X-Ray Diffractometer (XRD), and the microstructure and elemental composition using Scanning Electron Microscopy (SEM) coupled with EDS (Energy Dispersive Spectrometer). The study shows that a thin layer of ZnO is successfully deposited on a glass substrate by heat treatment at temperatures of 300 oC and 500 oC. Furthermore, XRD reveals that higher heating temperatures result in higher diffraction peak intensity. At a heating temperature of 300 °C crystals are formed but are not yet perfectly oriented, while they are at 500 °C. On the other hand, higher spin coating rotation speed gives rise to lower intensity of diffraction peak. The ZnO crystallization is easier to form in the coating process with a lower rotation (1500 rpm). Interestingly, the thin layer is stable over time where there is no significant change in each sample, both in terms of intensity and width of the ZnO crystal peak. The results indicate that gel precursor aged less than two days can form ZnO crystals. Finally, SEM results show that the surface morphology of the ZnO layer heated at 500 oC has an average grain size of 300 nm. Based on the cross-sectional results of SEM shows that the higher the coating rotation speed has resulted the thinner of the ZnO layer, where the thickness of the resulting layer is on order >5 mm.
Co-Authors Ahmad Taufiq Dita Puspita Sari Dwi Yuli Retnowati Fandi Annga Prasetya Ferry Anggoro Ardy Nugroho Gatut Yudoyono Hadi Santoso Hariyanto Hariyanto Malik Anjelh Baqiya Mariya Arifani Mastuki Mastuki Mohammad Ghufron Nur Ichzan Aminuddin Siantang Nurdin Nurdin Nurul Fitria Apriliani Nurul Fitriyah Prayogi, Saiful Qudsiyyatul Lailiyah Risqa Daniyati Sukainil Ahzan Sunaryono Tahta Amrillah Vicran Zharvan