Using multiple regression analysis, the relationship between ease of removal, receding contact angle and surface roughness was defined as: Work done (N mm)=17.18+0.055 Rugosity (nm)−0.52 Receding contact angle (r=0.49).
Two sisters in their 50's (Ms. Uggams and Lynda Gravatt) live together, past animosities surfacing, then receding, until a confrontation occurs.
To an outsider, most of Waziristan seems utterly desolate, as if a flood had just receded from its surface.
The small-sized bio-latex particles migrated to the surface due to their higher Brownian mobility relative to pigment initially, and in the later drying stage would move back into the coating pores with water because of its water affinity as the air-water interfaces receded from the surface into the capillaries.
The wettability characteristics, the advancing and receding contact angles between coating surface and ozocerite or crude oil were measured by the Wilhelmy plate method.
ACA, advancing contact angles; AFM, atomic force microscopy; CNH, carbon-oxygen-nitrogen content analysis; D, pore diameter; DMC, dimethyl carbonate; FTIR, fourier transform infrared spectroscopy; PMPS, polymethylphenysiloxane; RCA, receding contact angles; SSA, specific surface area; TEM, transmission electron microscopy; V p, pore volume; XPS, X-ray photoelectron spectroscopy.
Like all big movie stars, she can't disappear into her role for long; rather, she bobs to the surface of our consciousness, recedes, bobs to the surface, recedes.
Table 4 Advancing (ACA) and receding contact angles (RCA) of water, apparent surface free energy and the specific surface area (SSA) No. Scheme of modification Advancing contact angle θ a (deg).
The first experiment on this subject was conducted by Johnson and Dettre (1964) who measured the advancing and receding contact angles, according to the surface roughness [20].
However, due to the nature of the captive bubble technique, this method is also only suitable for testing the surface with advancing or receding contact angle below 130°.
