The pH value of fumed silica and its carbon content in fumed silica increase and silanol groups on its surfaces decrease with the increasing modification time, temperature and HMDS partial pressure.

• 随着处理时间的延长 ,温度的升高以及 HMDS分压的升高 ,经表面处理后的白炭黑的 p H值和含碳量增加 ,表面羟基数明显减少。