PELAPISAN BAHAN MAGNETIK PASIR BESI DENGAN SILIKA TERMODIFIKASI ETILENDIAMINA; COATING OF MAGNETIC MATERIAL OF IRON SAND WITH ETHYLENDIAMINE MODIFIED SILICA

Rozana, Kharistya, Nuryono

2015 | Skripsi | FMIPA

Study on coating magnetic material of iron sand with ethylendiamine modified-silica using sodium silicate (26.5% SiO2) as the silica source and 3- ethylenediamiprophyl trimethoxysilane (EDPTMS) as the ethylenediamine source through sol-gel process has been carried out. Studies covered the effect of Na2SiO3 solution volume at a constant volume of EDPTMS and vice versa on weight, the presence of functional groups, crystallinity, and magnetism of PB/SiO2/EN. The coating was carried out by mixing 0.5 g of magnetic material, obtained from separation of iron sand, with 1 mL of Na2SiO3 solution and volume variation of EDPTMS (1, 2, 3, 4 and 5 mL), and followed with addition of HCl solution to reach pH of 7 to obtain aqua-gel. The analog work was carried out by varying Na2SiO3 volume. Characterizations of PB/SiO2/EN were performed by Fourier Transform Infrared (FTIR) spectroscopy, X-ray Diffractometer (XRD), Elemental Analyzer (EA), Transmission Electron Microscope (TEM), and Vibrating Sample Magnetometer (VSM). The results showed that the magnetic material of iron sand has been successfully coated with ethylenediamine-modified silica. The increase in volume of Na2SiO3 solution inclines weight of obtained PB/SiO2/EN and reached constant at addition of the volume 2 mL. Meanwhile, at variation in volume of EDPTMS the constant weight was achieved at addition of 3 mL. In the above condition, the crystallinity and magnetic property of PB/SiO2/EN tend to be lower than those of the magnetic material before coating.

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