Examination of the surface of quartz capillaries by electrokinetic methods

Churaev, N. V.; Sergeeva, I. P.; Соболев, В. Д.; Derjaguin, B.V.

doi:10.1016/0021-9797(81)90236-8

Cited by 69 publications

(17 citation statements)

References 9 publications

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“…Precipitated silica such as Ludox cannot condense in a compact crystalline form but instead forms swollen gels with extended chains of polysilicic acid branching out into the medium. Such a gel layer has no high mechanical strength as demonstrated by Churaev et al (26), who were able to tear off the gel layer on a vitreous silica capillary by hydrodynamic forces, whereas removal of any surface layer could not be established with quartz surfaces (Zorin et al (27). On the other hand, under the electron microscope, after drying, the Ludox particles seem to be perfect spheres; all loosely bonded and gel-like elements are compacted by the drying process.…”

Section: Discussionmentioning

confidence: 89%

The Electroviscous Behavior of Aqueous Dispersions of Amorphous Silica (Ludox)

Lavèn

Stein

2001

Journal of Colloid and Interface Science

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Section: Discussionmentioning

confidence: 89%

The Electroviscous Behavior of Aqueous Dispersions of Amorphous Silica (Ludox)

Lavèn

Stein

2001

Journal of Colloid and Interface Science

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“…2 [17]. This in turn creates a static electric double layer, the Stern layer, consisting of tightly adsorbed cations close to the silica surface and a diffuse mobile layer with an excess of cations [18].…”

Section: The Ph Hysteresis Effectmentioning

confidence: 99%

Utilizing the pH hysteresis effect for versatile and simple electrophoretic analysis of proteins in bare fused-silica capillaries

Bohlin¹,

Blomberg²,

Heegaard³

2005

Electrophoresis

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The analysis of peptides and proteins by CE is often desirable due to low sample consumption and possibilities for nondenaturing yet highly effective separations. However, adsorption to the inner surfaces of fused-silica capillaries often is detrimental to such analyses. This phenomenon is especially pronounced in the analysis of basic proteins and proteins containing exposed positively charged patches. To avoid wall interactions numerous buffer additives and static and dynamic wall coating principles have been devised. We previously showed (J. Chromatogr. A 2004, 1059, 215-222) that CE of the basic protein beta2-glycoprotein was rendered possible by an acidic pretreatment step, and we attributed this observation to the so-called pH hysteresis effect that influences the time for pH equilibration of the capillary wall and thus the effective wall charge and the electroosmotic mobility. We here investigate the effects of different pretreatment techniques on EOF values and on the rate of the deprotonation of silanol groups when performing the electrophoresis at neutral pH. We show the utility of this simple approach for the CE analysis of a number of basic proteins in plain silica capillaries at physiological pH.

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“…We should not ignore the fact that isotherms of a-films could be affected to some extent by leaching and dissolving of substrates (which is pronounced for glass and mica), as well as the formation (however slow) of a gel layer on quartz surface in contact with water [73]. However, the contribution of the ITs component to the shape of a-isotherms seems to be the main factor.…”

Section: Chapter 10mentioning

confidence: 99%

Wetting Films

Derjaguin¹,

Churaev²,

Müller³

1987

Surface Forces

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Wetting films are crucially important in many technologies and natural processes. Flotation, detergency, wetting, and spreading require an understanding of wetting films. Their properties also influence the physical and mechanical properties of porous bodies, and the mechanism and kinetics of mass and energy transfer processes in them. For instance, the moisture transfer processes in soil and ground, in buildings and other porous materials, the processes of drying and moistening, capillary impregnation, and capillary condensation all involve wetting films. The thickness, viscosity, and stability of wetting films largely control the rates of these processes. DISJOINING PRESSURE OF WETTING FILMSBy "wetting films" is meant liquid films covering the surface of a condensed body. In contrast to foam and emulsion films, wetting films are asymmetric: one surface is bounded by a solid or liquid phase, the other by a gas.At any interface there are transition layers within which intensive properties and composition of the liquid differ from those in the bulk. The pressure tensor is anisotropic in interfacial transition layers. Its normal component PN ls constant and equals, for planar films, the pressure P in the gas phase. But the tangential component is a function of distance from the dividing interface, PT = PT(z). 327 B. V. Derjaguin et al., Surface Forces

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Examination of the surface of quartz capillaries by electrokinetic methods

Cited by 69 publications

References 9 publications

The Electroviscous Behavior of Aqueous Dispersions of Amorphous Silica (Ludox)

The Electroviscous Behavior of Aqueous Dispersions of Amorphous Silica (Ludox)

Utilizing the pH hysteresis effect for versatile and simple electrophoretic analysis of proteins in bare fused-silica capillaries

Wetting Films

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