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- W2052854802 abstract "Abstract The results of contact angle measurements on mica surfaces with aqueous dihexadecyldimethylammonium acetate (DHDAA) solution droplets at concentrations in the range 10 −6 to 10 −3 M are reported. At each concentration, four separate angles were measured: initial advancing, static advancing, initial receding and “equilibrated” receding. The advancing and receding angles both fell over a period of about one hour; the “static” and “equilibrated” angles were the values measured after this time. In the more concentrated solutions ( 7.5×10 −5 M ), this reduction can be attributed to bilayer formation whereas in dilute solutions the adsorbed surfactant molecules apparently either turn around to form an intercalated monolayer or are desorbed, but only at the three-phase line. This ‘perimeter effect’ occurs even for a droplet of water placed on an adsorbed, insoluble hydrophobic monolayer. A separate study of the solid—liquid interface confirms that an intercalated monolayer can indeed be formed at low DHDAA surfactant concentrations. A comparison of the properties of the solid—liquid and solid—vapour interfaces away from the three-phase line (TPL) suggests that in the microscopic movement of the TPL during measurement, the surface regions exposed or covered do not immediately convert to the equilibrium adsorbed state. The rate of this equilibration apparently depends on the monomer concentration of the surfactant and is an important factor in determining the observed contact angle." @default.
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- W2052854802 date "1987-01-01" @default.
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- W2052854802 title "A study of surfactant solution wetting on mica" @default.
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- W2052854802 doi "https://doi.org/10.1016/0166-6622(87)80151-8" @default.
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