DRAINAGE OF THIN LIQUID-FILMS BETWEEN RELATIVELY SMOOTH SURFACES
DRAINAGE OF THIN LIQUID-FILMS BETWEEN RELATIVELY SMOOTH SURFACES
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DOI：
10.1063/1.465059
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发表时间：
1993-05-01
影响因子：
4.4
通讯作者：
TONCK, A
中科院分区：
文献类型：
--
作者：
GEORGES, JM;MILLOT, S;TONCK, A
利用一种新的表面力装置，进行了静态和动态测量，研究了相对光滑的球体与平面之间的接触对液体的挤压。研究了具有不同固体表面(云母、钴、金、铂和钢)的简单液体和聚合物熔体(聚异戊二烯)。已经发现，在不参与液体流体动力流动的每个固体表面上都存在一层不动的流体。这种膜的厚度相对独立于固体的粗糙度，对应于少量的分子层(I到5)，并受分子结构的影响。这些流体表现出两种不同的行为：对于小分子，固定层的厚度与粘度成正比；对于较大的分子，其厚度与粘度的十分之一次方成正比。在挤压过程中，当固体表面接近时，由于分子纠缠，会产生一个“受限”层。这种现象对于半刚性碳氢化合物是有描述的。
Using a new surface force apparatus, static and dynamic measurements have been conducted to investigate the squeeze of a liquid from the contact between a relatively smooth sphere and a plane. Simple liquids and polymer melts (polyisoprene) have been studied, with different solid surfaces (mica, cobalt, gold, platinum, and steel). It has been found that an ''immobile'' layer of fluid is present on each solid surface which does not participate in the hydrodynamic flow of the liquid. The thickness of this film is relatively independent of the roughness of the solid, corresponds to a small number of molecular layers (I to 5), and is influenced by the structure of the molecule. These fluids shows two different behaviors: for small molecules the thickness of the ''immobile'' layer is proportional to the viscosity; for larger molecules the thickness is proportional to the one-tenth power of the viscosity. During the squeeze process, when the solid surfaces are close, a ''confined'' layer occurs due to molecule entanglement. This phenomenon is described for a semirigid hydrocarbon.