鑽石表面微波修飾及其與分散劑的交互作用之探討

鑽石材料本身具有極高硬度、良好物理及化學穩定性，且可經由簡單的表面處理在表面形成各種官能基，而官能基可以改變親水、親油性，或者讓表面帶電量增加，因此被廣泛的應用。本研究將2-4 μm鑽石粉末加入去離子水中製備成鑽石懸浮液，並進行聚焦微波處理。結果顯示利用去離子水當微波反應溶劑，反應三分鐘後即可將Zeta Potential從絕對值10 mV提升至-40 mV左右。經由簡單的微波製程即可大幅提升表面帶電量。30 mV的表面帶電量可以有效的分散顆粒小於1 μm的鑽石懸浮液，但在研磨上所使用的鑽石顆粒大部分都大於1 μm。因此選用黏度較高的乙二醇作為為溶劑並且添加各種分散劑，製備成鑽石研磨液，由結果可以觀察出帶有胺基的鹼性分散劑具有較為良好之分散性。添加高分子聚合物(PVP)做為第二種分散劑，可以藉由PVP與鑽石表面官能基鍵結形成立體障壁，大幅增強懸浮性。比較添加了各種分散劑的鑽石研磨液後，可以發現添加油胺和PVP的樣品具有較佳的懸浮及分散性。

關鍵字

鑽石研磨液；微波；分散

並列摘要

Diamond material possesses high hardness, good physical and chemical stability, and has a variety of functional groups formed on the surface with a simple treatment. surface functional groups can change the hydrophilic or lipophilic, and the surface charges with the increased zeta potential. Therefore, it is extensively used in a variety of applications. In this study, diamond suspensions were prepared by dispersing the 2-4 μm diamond powders in deionized water, and treated with a focused microwave. The treatment can enhance zeta potential from the absolute value of 10 mV to about 40 mV. Diamond with zeta potential of 30 mV can be effectively dispersed when the partical size is less than 1 μm. When the diamond particles are larger than 1 μm, we used ethylene glycol with higher viscosity as a solvent and added dispersants to prepare diamond slurry. The results showed that the amine groups of the alkaline dispersant has a better dispersibility. With the addition of poly(vinylpyrrolidone) (PVP) as a second dispersant, the suspension can be enhanced, which derived from the steric hindrance due to formation of the bonding between the groups on diamond surface and PVP. The diamond slurry whith adding of oleylamine and PVP sample has better suspension and dispersibility than the samples with other dispersants.

並列關鍵字

Diamond slurry ； microwave ； dispersion

參考文獻

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鑽石表面微波修飾及其與分散劑的交互作用之探討

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