Adler Joshua J., Rabinovich Yakov I., Moudgil Brij M.
Engineering Research Center for Particle Science and Technology, Department of Materials Science and Engineering, University of Florida, 205 Particle Science and Technology Building, Gainesville, Florida, 32611-16135
J Colloid Interface Sci. 2001 May 15;237(2):249-258. doi: 10.1006/jcis.2001.7466.
Direct measurement of surface forces has revealed that silica surfaces seem to have a short-range repulsion that is not accounted for in classical DLVO theory. The two leading hypotheses for the origin of the non-DLVO force are (i) structuring of water at the silica interface or (ii) water penetration into the surface resulting in a gel layer. In this article, the interaction of silica surfaces will be reviewed from the perspective of the non-DLVO force origin. In an attempt to more accurately describe the behavior of silica and glass surfaces, alternative models of how surfaces with gel layers should interact are proposed. It is suggested that a lessened van der Waals attraction originating from a thin gel layer may explain both the additional stability and the coagulation behavior of silica. It is important to understand the mechanisms underlying the existence of the non-DLVO force which is likely to have a major influence on the adsorption of polymers and surfactants used to modify the silica surface for practical applications in the ceramic, mineral, and microelectronic industries. Copyright 2001 Academic Press.
表面力的直接测量结果表明，二氧化硅表面似乎存在一种经典的德贾金-朗道-维韦-奥弗比克（DLVO）理论无法解释的短程排斥力。关于非DLVO力起源的两个主要假说是：（i）二氧化硅界面处水的结构化；或（ii）水渗透到表面形成凝胶层。在本文中，将从非DLVO力起源的角度对二氧化硅表面的相互作用进行综述。为了更准确地描述二氧化硅和玻璃表面的行为，提出了具有凝胶层的表面应如何相互作用的替代模型。有人认为，源自薄凝胶层的范德华吸引力减弱可能解释了二氧化硅的额外稳定性和凝聚行为。了解非DLVO力存在的潜在机制很重要，因为它可能对用于陶瓷、矿物和微电子工业实际应用中改性二氧化硅表面的聚合物和表面活性剂的吸附产生重大影响。版权所有2001年学术出版社。
