Measurement of Surface Properties on Fine Ground Product by Laser-Raman Spectrum

研究了石英粉在十六醇正己烷溶液中经球磨机和行星磨粉碎后的表面性质。原来的石英粉显示其本身是亲水性的，因为它分散在水中。用行星磨以730 rpm粉碎5 min或540 rpm粉碎40 min后，石英粉漂浮在水面上，表面性质发生变化，呈现疏水性。从它们的拉曼光谱中可以看出，由二氧化硅分子的反对称伸缩振动引起的三个峰（467 cm <@D1 - 1> D 1，212 cm <@D1 - 1 @> D 1，130 cm <@D1-1@> D 1）随着粉碎而减弱，在疏水粉末上除467 cm <@D1-1@> D 1处的一个很弱的峰外，没有其它峰。红外光谱表明，疏水性粉末上有两个由颗粒表面甲基伸缩振动引起的峰（2940 cm <@D1 - 1@>D1，2850 cm <@D1-1@>D1）。结果表明，石英颗粒表面覆盖着由十六醇衍生的疏水基团。与此相反，亲水性粉末在蒸馏水中粉碎后光谱几乎没有变化，因此，发现石英粉末由于粉碎的机械化学反应而被有效地表面处理。激光拉曼光谱和红外光谱可以测量粉体表面性质的变化。

The surface nature of quartz powder pulverized in a hexane solution of cetyl alcohol by a ball mill or a planetary mill was studied. The original quartz powder showed itself to be hydrophilic since it dispersed in water. But the surface nature of quartz after pulverization for 5 minutes at 730rpm or 40 minutes at 540rpm by a planetary mill changed to be hydrophobic since the powder floats on water.The surface nature of fine ground products was investigated by laser-Raman spectrum and infrared spectrum. From their Raman spectra, three peaks (467cm<@1-1>D1, 212cm<@D1-1@>D1 130cm<@D1-1@>D1) caused by inverse symmetrical stretching vibration of silica molecules are decreasing with pulverization, and there are no peaks except a very weak peak at 467cm<@D1-1@>D1 on hydrophobic powder. From their infrared spectra, two peaks (2940cm<@D1-1@>D1, 2850cm<@D1-1@>D1) caused by stretching vibration of methyl group on the particle surface can be measured on hydrophobic powder. These results shows that the surface of quartz particle is covered with hydrophobic group which comes from cetyl alcohol. In contrast, there are almost no spectra change for the hydrophilic powder by pulverized in a distilled water.Accordingly, the quartz powder was found to be surfaced treated effectively due to mechano-chemical reaction by pulverization. The change of surface nature of powder can be measured by laser-Raman spectrum and infrared spectrum.