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http://dx.doi.org/10.9727/jmsk.2018.31.1.47

Particle Size Analysis of Nano-sized Talc Prepared by Mechanical Milling Using High-energy Ball Mill  

Kim, Jin Woo (Department of Geoenvironmental Sciences, Kongju National University)
Lee, Bum Han (Korea Institute of Geoscience and Mineral Resources)
Kim, Jin Cheul (Korea Institute of Geoscience and Mineral Resources)
Kim, Hyun Na (Department of Geoenvironmental Sciences, Kongju National University)
Publication Information
Journal of the Mineralogical Society of Korea / v.31, no.1, 2018 , pp. 47-55 More about this Journal
Abstract
Talc, hydrous magnesium phyllosilicate, is one of the most popular industrial minerals due to their chemical stability and adsorptivity. While micro-sized talc has long been used as a filler and coating, nano-sized talc recently is attracting attention as additives for improving the stability of nanocomposites. In this study, we produced the nano-sized talc powder by mechanical method using high energy ball mill and investigated the changes in particle size and crystallinity with increasing milling time up to 720 minutes. X-ray diffraction results show that the peak width of talc gradually as the milling proceeded, and after 720 minutes of pulverization, the talc showed an amorphous-like X-ray diffraction pattern. Lase diffraction particle size analysis presents that particle size of talc which was ${\sim}12{\mu}m$ decreased to ${\sim}0.45{\mu}m$ as the milling progressed, but no significant reduction of particle size was observed even after grinding for 120 minutes or more. BET specific surface area, however, steadily increases up to the milling time of 720 minutes, indicating that the particle size and morphology change steadily as the milling progressed. Scanning electron microscope and transmission electron microscope images shows that layered particles of about 100 to 300 nm was aggregated as micro-sized particles after pulverization for 720 minutes. As the grinding time increases, the particle size and morphology of talc continuously change, but the nano-sized talc particles form micro sized agglomerates. These results suggest that there is a critical size along the a, b axes in which the size of plates is reduced even though the grinding proceeds, and the reduction of plate thickness along the c axis leads the increase in specific surface area with further grinding. This study could enhance the understanding of the mechanism of the formation of nano-sized talc by mechanical grinding.
Keywords
talc; high-energy ball mill; nanoparticles; particle size analyzer; agglomerates;
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