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• W2048878424 abstract "Abstract Experimental methods are described for the preparation and examination of hydrophobic monomolecular films adsorbed, and isolated from aqueous solutions of certain types of polar-nonpolar organic compounds. The use of contact angle measurements for the quantitative characterizations of the hydrophobic and oleophobic properties of such films permits the evaluation of the various factors governing their formation, structure, and repellency characteristics. The present paper reports the results of studies on several members of a homologous family of primary amines of the normal alkyl type adsorbed onto platinum surfaces. The critical limits to hydrophobic film formation and the degree of hydrophobicity are found to be functions of the amine concentration and the pH of the generating solution. A definite correlation is established for the relative effectiveness of these factors and the length of the hydrocarbon chain in the aliphatic portion of the amine molecule. The marked response of hydrophobic film formation to pH and concentration is interpreted as an adsorption-desorption phenomenon in which the equilibrium conditions are determined by the solubility and degree of ionization of the individual amines. The short chain amines (up through dodecyl) are found to be most adsorptive in the alkaline region, whereas film formation of the hexadecylamine is limited to the highly acid regions. The intermediate tetradecylamine evinces a transitional behavior, having two separate pH regions favorable to film formation. The identity of adsorbed monomolecular films isolated hydrophobically from aqueous solution and oleophobically from the molten amine or from solution in hexadecane is established. The use of water as solvent increases the number of molecular types available for study as reproducible, repellent films. The method is proposed as a possible approach to the examination of films important in the fields of selective adsorption, mineral flotation, corrosion inhibition, and “pickling” of metals." @default.
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• W2048878424 date "1949-12-01" @default.
• W2048878424 modified "2023-10-13" @default.
• W2048878424 title "Hydrophobic monolayers adsorbed from aqueous solutions" @default.
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• W2048878424 doi "https://doi.org/10.1016/0095-8522(49)90054-9" @default.
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