改性纳米高岭土的制备及特性研究

用钛酸酯和硅烷偶联剂对纳米高岭土进行表面改性,并采用红外光谱、沉降实验、容重对粉体的改性效果进行了分析。结果表明:偶联剂与纳米高岭土之间发生了相互作用,且复配改性的效果最好;改性高岭土在液体石蜡中具有较好的沉降性能,沉降速度下降;颗粒之间的团聚减少,容重为原矿的一半左右,且改性后样品的白度提高了近5%。     

重庆之雾

引言 雾为稳定性气团中所产生之一种水气象(Hydrometeore)无数纤毫之水珠其质点之大小非肉眼所能辨察,雾珠之直径平均约十二炒(Micron=1/1000mm)。雾珠浮游空际,形若帐慢,阻础视程,当有雾之际,在一公里之人物,已不能辨别。是以浓雾笼罩地面有础飞行,浓雾飘浮海面危及航行。在北欧瑞典鄰海中春季二三月间因雾失事居船只失事总次数之百分比,可高达百分之五十至六十。(1)雾里     

Applications of Natural Radiation-Induced Paramagnetic Defects in Quartz to Exploration in Sedimentary Basins

INTRODUCTION Point defects in quartz have attracted intensiveand continuing research since the 1950s ( Weil ,2000 ,1984 ; Marfunin, 1979 ; Weeks , 1956 ; McClellandand Donoghue ,1953) because they are key factors inenhancing ( or reducing) device performance andquality of this i mportant piezoelectric and optical ma-terial (Beall ,1994) .Point defects in quartz are usu-ally dilute in concentration and,therefore ,are ame-nable to study by only a fewstructural techniques ,ofwhich electron…