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Abstract

In a series of studies on the relation between the wettability or repellency of textile assemblies and their structures, apparent contact angles (ϕ) of monofilament nylon and polyester mesh screens to water were measured to clarify the effect of the woven structure on the repellency of textiles. The apparent equilibrium contact angles (ϕ _e ), not the apparent advancing ones (ϕ _A ), can be quantitatively predicted by using the theoretical expressions for the liquid-solid and liquid-air interfaces per unit of mac roscopic surface area in the Cassie-Baxter equation (f ₁ and f ₂, respectively) and the true advancing contact angles (θ _A ). The effect of the size of sessile water drops on the apparent contact angles (ϕ) was also interpreted in terms of the distortion of the drop surface owing to the gravity effect.

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References

Baxter, S. , and Cassie, A.B.D. , The Water Repellency of Fabrics and a New Water Repellency Test. J. Textile Inst. 36, T67-T90 ( 1945).

Cassie, A.B.D. , and Baxter, S. , Wettability of Porous Surfaces , Trans. Faraday Soc. 40, 546-551 (1944).

Good, R.J. , and Koo, M.N. , The Effect of Drop Size on Contact Angle, J. Colloid Interface Sci. 71, 283-292 (1979).

Kawase, T. , Fujii, T. , and Minagawa, M. , Repellency of Textile Assemblies, Part 1: Apparent Contact Angle of Wax-Coated Monofilament Mesh Screen. Textile Res. J. 57, 185-191 ( 1987).

Kawase, T. , Sekoguchi, S. , Fujii, T. , and Minagawa, M. , Spreading of Liquids in Textile Assemblies, Part I: Capillary Spreading of Liquids, Textile Res. J. 56, 409-414 (1986).

Shuttleworth, R. , and Bailey, G.L.J. , The Spreading of a Liquid over a Rough Solid , Discuss. Faraday Soc. 3, 16-22 (1944).

Wenzel, R.N. , Resistance of Solid Surfaces to Wetting by Water, Ind. Eng. Chem. 28, 988-994 (1936).