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Download PDF by Carel J. van Oss: Interfacial Forces in Aqueous Media

By Carel J. van Oss

ISBN-10: 1574444824

ISBN-13: 9781574444827

"This sensible monograph treats, for the 1st time, the interfacial forces between biopolymers, debris and surfaces, and cells and different polar and apolar polymers encompassing Lifshitz-van der Waals and electrostatic interactions in addition to hydrogen-bonding interactions among colloidal entities in polar media, in particular water."

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Extra info for Interfacial Forces in Aqueous Media

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II-35]), LW AB and applying eq. [IV-2], it is obvious that when γ 12 and when the conditions < γ 12 of eq. [IV-8A] or eq. [IV-8B] prevail, the total interfacial tension between polar substances 1 and 2: 2 ᮍ ᮎ ᮍ ᮎ γ 12 = ( γ 1LW − γ LW 2 ) + 2( γ 1 γ 1 + γ 2 γ 2 [IV-9] − γ1 γ 2 − γ1 γ 2 ) ᮍ ᮎ ᮎ ᮍ AB P A comparison between the approach given in eq. [IV-7] and the hypothesis that γ 12 “γ 12 ”= which still has some adherents, is given in Chapter XIV. , Advan. , 1987). The implications of this finding are far-reaching; they are discussed later in this chapter; see also Chapters XIII and XIV.

A comparison between this version of the Young-Dupré equation and an older, intuitive (but erroneous) ᮎ ᮍ version, in which our γ Sᮍ γ ᮎ γ SP γ PL , can be found in Chapter L + γ S γ L is replaced by a single term, XIV. The influence (if any) of the “spreading pressure” described by Bangham and Razouk (1937) is really a consequence of the deposition of vapor molecules from the contact angle liquids onto the solid flat surface. This influence is however exceedingly small; see van Oss, Giese and Wu (1998) and see also Chapter XII.

However, for the derivation of values for γ 12 , ΔG12 , ᮍ ᮎ AB AB ΔG121 and ΔG132, it is not necessary to know the absolute values of γ i and γ i of any ᮎ ᮍ substance i. It suffices to use polarity ratios, of γ ᮍ i and γ i relative to the values γ R ᮎ and γ R , respectively, of a reference compound, such as, for instance, water. Using the subscript W for water, such polarity ratios, δᮍ and δᮎ are then defined as follows: ᮍ δᮍ γᮍ iW = i /γ W [IV-19A] ᮎ δᮎ γᮎ iW = i /γ W [IV-19B] and ᮎ δᮍ iW and δ iW being the relative Lewis acid and base polarities, respectively, of substance i, with respect to water.

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Interfacial Forces in Aqueous Media by Carel J. van Oss


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