Adhesives. Wettability. Determination by measurement of contact angle and critical surface tension of solid surface

1998 ◽  
Keyword(s):  
Surface Tension ◽  
Contact Angle ◽  
Solid Surface ◽  
Critical Surface ◽  
Critical Surface Tension

Critical Surface Tension of Cholesteryl Ester Liquid Crystal

2014 ◽  
Vol 925 ◽  
pp. 43-47
Author(s):  
Wan Ibtisam Wan Omar ◽  
Chin Fhong Soon
Keyword(s):  
Surface Tension ◽  
Contact Angle ◽  
Liquid Crystal ◽  
Liquid Crystals ◽  
Cholesteryl Ester ◽  
Culture Media ◽  
Angle Measurement ◽  
Critical Surface ◽  
Critical Surface Tension ◽  
Cholesteric Phase

Cholesteryl ester liquid crystal was found to be non-toxic and it was recently applied as a cell traction force sensor. The reason for the affinity of the cells to this liquid crystal is unclear and required further investigation. This paper focused on determining the surface energy of the liquid crystals. A custom built contact angle measurement system and Fox-Zisman theory was applied to determine the critical surface tension of the cholesteryl ester liquid crystal. Eight different polar probe liquids were selected to determine the contact angle of the glass slides coated with cholesteryl ester liquid crystals. We found that the critical surface tension of the liquid crystal at 37.5 mN/m characterized the surface of the liquid crystal to be moderately hydrophobic. However, as reported in our previous work that the interaction of the liquid crystal and the cell culture media could re-orientate the amphiphilic molecules of the liquid crystals leading to the formation of lyotropic layers on the bulk cholesteric phase, therefore, making the surface to be hydrophilic. This then supported the formation of the hydrophilic layers that favors cell adhesion.

Study on Surface Tension of Membrane Made in Cellulose Diacetate

2017 ◽  
Vol 744 ◽  
pp. 375-379
Author(s):  
Hua Huang ◽  
Yue Fei Wang ◽  
Li Zhang ◽  
Ying Wu ◽  
Tao Ji ◽  
...  
Keyword(s):  
Surface Tension ◽  
Contact Angle ◽  
Flat Glass ◽  
Critical Surface ◽  
Linear Extrapolation ◽  
Cellulose Diacetate ◽  
Critical Surface Tension ◽  
Glass Slides ◽  
Harmonic Equation ◽  
Made In

The value of surface tension is important for choosing oil in CA fibers production. So indirect method were used to analyze the surface tension of CA fibers in this paper. First, Chips of CA were dissolved in acetone solution with 5%, 10%, 15% three kinds of concentration. The three kinds of concentration of the solution were heated 5 hours with 55°C and then standing and defoaming for 24h. Squeeze the solution with two flat glass slides to make the membranes. Second, choose deionized water, Glycerin, Formamide, Bromonaphthalene and Diiodomethane with different polarity as tested liquids to measure the contact angle of CA membrane with JC2000C contact angle meter. Then, Zisman’s linear extrapolation method was used to measure the critical surface tension of CA membranes. On the other hand, S. Wu’S harmonic equation on average method was used too for comparison. The value of two different methods was the same, 42 mN/m, and the result indicated that the estimated method was reliable.

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