PENGARUH WAKTU HIGH ENERGY MILLING TERHADAP KARAKTERISTIK NANOKAOLIN CAPKALA ASAL KALIMANTAN BARAT

Abstract

Synthesis of nanokaolin from Capkalas natural clay from Bengkayang, West Borneo has been studied. Modification of kaolin particles into nano size was done by high energy milling methods using HCl 2M activator solutions. The variables that investigated is the effect of milling time on the particle size produced. Morphology and structure of nanokaolin were characterized using scanning electron microscope (SEM), x-ray diffraction (XRD) and fourier transform infrared spectrometer (FTIR). The result showed that the longer milling time produced smaller and uniform particles size of kaolin. The SEM result showed that kaolin has particle size about 64-158 nm. The result of XRD showed that kaolin before and after milling has no different 2 angle, but increased the peak intensity of mineral quartz. The result of IR spectra showed Al-O vibration on wavenumber 996,05 cm^-1 and 600,72 cm^-1and bending Si-O-Si vibration on wavenumber 666,77 cm^-1 .