Viscosity studies of liquid boundary layers by the blow-off method

Since viscosity is a structure-sensitive property, the peculiar structure of the boundary layers of liquids can be detected by their viscosity, measured after the ‘blow-off’ method developed at an earlier date. The measurements given (for non-volatile liquids) show that for non-polar liquids the viscosity remains strictly constant right down to the solid wall. The contrary is true for polar liquids or solutions of polar substances. In these cases viscosity changes, often in the nature of a jump, are observed upon approaching the solid wall to within 10^-6-10^-5 cm; in the case of vinylbutyl ether polymer, to within 5·10^-4 cm.