PELAPISAN MAGNETIT DENGAN SILIKA TERMODIFIKASI MERKAPTO
| Main Authors: | , NUR MUTIA ROSIATI, , Prof. Dr. Nuryono, MS |
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| Format: | Thesis NonPeerReviewed |
| Terbitan: |
[Yogyakarta] : Universitas Gadjah Mada
, 2013
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| Subjects: | |
| Online Access: |
https://repository.ugm.ac.id/122054/ http://etd.ugm.ac.id/index.php?mod=penelitian_detail&sub=PenelitianDetail&act=view&typ=html&buku_id=62153 |
Daftar Isi:
- In this research magnetite has been coated with mercapto modificated silica using sodium silicate solution extracted from rice husk ash as silica source and 3- mercaptopropiltrimethoxysilane (MPTMS) as mercapto source. Magnetite obtained through Fe 2+ /Fe 3+ salts mixture co-precipitation using NH4OH as precipitating solution. Effectiveness of mechanical and ultrasonic stirring techniques were compared. Coating was done through the sol-gel process by mixing magnetite, sodium silicate and MPTMS at various mole ratio of silica and MTPMS (100:0, 75:25, 50:50, 25:75 and 0:100). The mixture was adjusted to pH 7 using HCl or NH4OH solution. Coated magnetite was characterized by Fourier Transform Infrared Spectrophotometer (FTIR), X-ray Diffraction (XRD), Transmission Electron Micrograph (TEM), Gas Sorption Analyzer (GSA) by BET method, Vibrating Sample Magnetometer (VSM) and stability test to acidic condition. The results showed that the crystallinity of synthesized magnetite by ultrasonic stirring was higher than that of mechanical stirring. Magnetite coating could increase the particle size and stability to acid but reduce the magnetic properties.