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contact angles
Dynamic Contact Angles of Water in Ultrathin Capillaries
      
The displacement kinetics is described by Washburn's equation with the dynamic values of contact angles and bulk viscosities of the solution and oils.
      
Contact angles were determined upon wetting of a cured epoxy resin by oligo(oxypropylene glycols) with different terminal groups.
      
A technique aimed at measuring contact angles for microparticles and suitable for determining the linear tension is developed.
      
The advancing and receding contact angles of water are measured for individual polystyrene microspheres with radii from 1 to 5 μm.
      
The contact angles are shown to increase with a decreasing microsphere radius, whereas the hysteresis of the contact angle decreases.
      
Modified Tilting-Plate Method for Measuring Contact Angles
      
The results of measuring contact angles by this method are well consistent with the data obtained by the sessile drop method.
      
A procedure based on the analysis of the shape of a sessile drop was used to measure the contact angles of water in air, θa = 93°-97°, for quartz and glass plates modified with polyalkylhydrosiloxanes.
      
A correlation is established between the stability of latexes (varying in the film-formation process) and the critical concentration of their coagulation, on the one hand, and the water contact angles, on the other hand.
      
The kinetics of dewetting (a decrease in contact angles and wetted surface area) during the evaporation of drops of cetyltrimethylammonium bromide (CTAB) solutions from paraffin and Teflon surfaces was studied in a wide concentration range.
      
Disjoining pressure isotherms of wetting films determine the wetting conditions and the values of forming contact angles.
      
It was shown that the contact angles of mixed solutions at low-energy surfaces could be predicted on the basis of surface tension isotherms.
      
The flow rates and the dynamic contact angles of aqueous solutions of cationic polyelectrolyte (CPE) in quartz capillaries with radius of 3-4 μm are measured.
      
It is established that, as the solution concentration increases, the advancing contact angles are reduced from 83° to 75°; the receding contact angles lie between 10° and 20°.
      
On the Accuracy of Measuring Small Contact Angles by the Sessile Drop Method
      
The errors arising in measuring the contact angles of a sessile drop by the mirror method are analyzed.
      
The formulas are derived enabling one to take into account the distortions of a visible image and enhance the accuracy of measuring contact angles.
      
This is no longer the case with the polydimethylsiloxane oligomers, where the very small contact angles require a more elaborated analysis of the drop edge.
      
Water contact angles on the materials under examination are found.
      
 

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