Examination of the surface of quartz capillaries by electrokinetic methods
1981; Elsevier BV; Volume: 84; Issue: 2 Linguagem: Inglês
10.1016/0021-9797(81)90236-8
ISSN1095-7103
AutoresN. V. Churaev, И. П. Сергеева, В. Д. Соболев, B.V. Derjaguin,
Tópico(s)Electrostatics and Colloid Interactions
ResumoThe electrokinetic and surface charge of “fresh” quartz capillaries is equal to 1.2 ÷ 2.3 μC/cm2, and it is independent of the concentration of KCl solution (for C ⩾ 103 M). Long-time contact with water and KCl solutions leads to the gel-layer formation on the capillary surface, and accordingly to the changes in surface charge and potential. The liquid flow in the capillary under the action of a sufficiently high pressure drop can shear and tear off the surface gel layer. This effect is accompanied by the observed changes in the ζ-potential values.
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