Electrostatic Charging of Hydrophilic Particles Due to Water Adsorption

被引:124
作者
Gouveia, Rubia F. [1 ]
Galembeck, Fernando [1 ]
机构
[1] Univ Campinas UNICAMP, Inst Chem, BR-13083970 Campinas, SP, Brazil
关键词
SILICA SURFACE; BUILDUP; FILMS; IONS;
D O I
10.1021/ja900704f
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
Kelvin force microscopy measurements on films of noncrystalline silica and aluminum phosphate particles reveal complex electrostatic potential patterns that change irreversibly as the relative humidity changes within an electrically shielded and grounded environment. Potential adjacent to the particle surfaces is always negative and potential gradients in excess of +/- 10 MV/m are found parallel to the film surface. These results verify the following hypothesis: the atmosphere is a source and sink of electrostatic charges in dielectrics, due to the partition of OH- and H+ ions associated to water adsorption. Neither contact, tribochemical or electrochemical ion or electron injection are needed to change the charge state of the noncrystalline hydrophilic solids used in this work.
引用
收藏
页码:11381 / 11386
页数:6
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