Sulissetiawati, - (2024) SINTESIS DAN KAJIAN STABILITAS FERROFLUIDA Fe3O4 SERTA POTENSI APLIKASINYA PADA ELECTROMAGNETIC VIBRATION ENERGY HARVESTER. S1 thesis, Universitas Pendidikan Indonesia.
Abstract
Ferrofluida merupakan material magnetik yang tersusun atas nanopartikel magnetik yang distabilisasi surfaktan dan terdispersi pada pelarut organik atau air. Salah satu aplikasi ferrofluida yaitu sebagai pelumas magnet induksi pada Electromagnetic Vibration Energi Harvester (EVEH) untuk stabilisasi gerak dan mengurangi abrasi material. Dalam penelitian ini, nanopartikel Fe3O4 disintesis melalui metode kopresipitasi, dihasilkan dari reaksi ion Fe3+ dan Fe2+ dalam media basa yang dicapai melalui penambahan ammonia hingga pH 9. Ferrofluida dibuat dari nanopartikel Fe3O4 distabilisasi asam oleat terdispersi dalam kerosin melalui metode dua langkah. Kestabilan ferrofluida dikaji melalui pengaruh rasio Fe3O4-asam oleat sebesar 1:1, 1,25:1, 1,5:1, dan 1,75:1. Nanopartikel Fe3O4 telah disintesis dengan metode kopresipitasi memiliki kemurnian 75,6% dengan struktur kristal cubic inverse spinel, ukuran kristalit sebesar 10,05 nm, ukuran diameter hidrodinamik melalui PSA diperoleh sebesar 17,24 nm, dan magnetisasi saturasi melalui VSM sebesar 22,93 emu/g. Aglomerasi dan keberadaan pengotor pada sampel menyebabkan sifat magnet nanopartikel Fe3O4 tidak ideal. Analisis kestabilan ferrofluida nanopartikel Fe3O4 distabilisasi asam oleat dianalisis secara kualitatif maupun kuantitatif. Secara kualitatif stabilitas ferrofluida dikaji melalui pengamatan visual, diketahui terjadi sedimentasi di hari ke-8 dan cenderung tidak berubah setelahnya hingga hari ke-29. Berdasarkan hasil pengamatan visual, ferrofluida dengan rasio 1,75:1 menunjukkan pembentukan sedimentasi paling sedikit. Sedangkan secara kuantitatif ferrofluida dianalisis melalui absorbansi UV-Vis, menunjukkan bahwa adanya sedimentasi melalui peningkatan absorbansi di hari ke-29 dibandingkan hari ke-0 pengedapan dengan perubahan absorbansi semua sampel cenderung sama. Aplikasi ferrofluida pada EVEH menunjukkan peran sebagai komponen pendukung untuk stabilisasi gerak magnet induksi dalam EVEH, dengan daya keluaran EVEH sebesar 3,555 mW. Ferrofluid is a magnetic materials composed of magnetic nanoparticles stabilized by surfactants and dispersed in an organic solvent or water. One application of ferrofluid is as lubricant in Electromagnetic Vibration Energy Harvesters (EVEH) to stabilize movement and reduce material abrasion. In this study, Fe₃O₄ nanoparticles were synthesized via the coprecipitation method, resulting from the reaction of Fe³⁺ and Fe²⁺ ions in a alkaline medium achieved by the addition of ammonia until pH 9. The ferrofluid was made from Fe₃O₄ nanoparticles stabilized by oleic acid and dispersed in kerosene using a two-step method. The stability of the ferrofluid was examined based on the influence of Fe3O4-oleic acid ratios of 1:1, 1,25:1, 1,5:1, and 1,75:1. The Fe₃O₄ nanoparticles synthesized by the coprecipitation method have a purity of 75,6%, with a cubic inverse spinel crystal structure, a crystallite size of 10.05 nm, a hydrodynamic diameter of 17,24 nm obtained through PSA, and a saturation magnetization of 22,93 emu/g measured by VSM. The presence of agglomeration and impurities in the sample resulted in the Fe3O4 nanoparticles having non-ideal magnetic properties. The stability of the Fe3O4 nanoparticle ferrofluid stabilized with oleic acid was analyzed both qualitatively and quantitatively. Qualitatively, the stability of the ferrofluid was examined through visual observation, revealing sedimentation on day 8, which remained unchanged until day 29. Based on visual observations, the ferrofluid with a ratio of 1,75:1 showed the least sedimentation formation. Quantitatively, the ferrofluid was analyzed using UV-Vis absorbance, indicating sedimentation through increased absorbance on day 29 compared to day 0, with the change in absorbance being consistent across all sample. The application of ferrofluid in EVEH demonstrated its role as a supporting component for stabilizing the movement of the induction magnet in EVEH, with the EVEH output power being 3.555 mW.
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| Item Type: | Thesis (S1) |
|---|---|
| Additional Information: | https://scholar.google.com/citations?hl=en&view_op=list_works&gmla=AC6lMd9EUbL6yKZ3_IY75ZjCGfiFg8s_r2eJvycFGA8xfxECm8qd_Egq-7cC07z29L_3on2rmYaJF_mi-ky67w&user=PQyzenQAAAAJ ID SINTA Dosen Pembimbing: Andhy Setiawan : 6040311 Novrita Idayanti : 6816696 |
| Uncontrolled Keywords: | Ferrofluida, Nanopartikel Magnetik Fe3O4, Asam Oleat, Kestabilan, Electromagnetic Vibration Energy Harvester. Ferrofluid, Magnetic Fe3O4 Nanoparticles, Oleic Acid, Stability, Electromagnetic Vibration Energy Harvester . |
| Subjects: | Q Science > QC Physics |
| Divisions: | Fakultas Pendidikan Matematika dan Ilmu Pengetahuan Alam > Program Studi Fisika - S1 > Program Studi Fisika (non kependidikan) |
| Depositing User: | Sulissetiawati |
| Date Deposited: | 28 Aug 2024 08:47 |
| Last Modified: | 28 Aug 2024 08:47 |
| URI: | http://repository.upi.edu/id/eprint/121222 |
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