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Titolo:
ON THE PREDOMINANT ELECTRON-DONICITY OF POLAR SOLID-SURFACES
Autore:
VANOSS CJ; GIESE RF; WU W;
Indirizzi:
SUNY BUFFALO,DEPT MICROBIOL BUFFALO NY 14214 SUNY BUFFALO,DEPT CHEM ENGN BUFFALO NY 14214 SUNY BUFFALO,DEPT GEOL BUFFALO NY 14214 SUNY BUFFALO,DEPT CHEM BUFFALO NY 14214
Titolo Testata:
The Journal of adhesion
fascicolo: 1-3, volume: 63, anno: 1997,
pagine: 71 - 88
SICI:
0021-8464(1997)63:1-3<71:OTPEOP>2.0.ZU;2-H
Fonte:
ISI
Lingua:
ENG
Soggetto:
CONTACT-ANGLE MEASUREMENTS; TENSION COMPONENTS; MECHANISM; HYDROPHOBICITY; PARAMETERS; LIQUIDS; SYSTEMS; MEDIA;
Keywords:
BIPOLAR LIQUIDS; ELECTRON-ACCEPTORS; ELECTRON-DONORS; ENERGY OF COHESION OF LIQUIDS; ENERGY OF COHESION OF SOLIDS; LEWIS ACID-BASE INTERACTIONS; LIFSHITZ-VAN DER WAALS INTERACTIONS; MONOPOLAR LIQUIDS; MONOPOLAR SOLID SURFACES; SURFACE TENSION COMPONENTS; WATER OF HYDRATION;
Tipo documento:
Article
Natura:
Periodico
Citazioni:
36
Recensione:
Indirizzi per estratti:
Citazione:
C.J. Vanoss et al., "ON THE PREDOMINANT ELECTRON-DONICITY OF POLAR SOLID-SURFACES", The Journal of adhesion, 63(1-3), 1997, pp. 71-88

Abstract

The reasons for the predominant electron-donicity of almost all solidpolar surfaces and its implications are discussed in this paper. By contact angle or interfacial tension measurements, the electron-accepting as well as the electron-donating properties of polar liquids can beascertained, through the interplay between their energies of adhesionand cohesion. For the solid-liquid interface, direct interfacial tension measurements are not possible, but indirectly, solid/liquid interfacial tensions of polar systems can be obtained by contact angle measurement. However, as the energy of cohesion of a solid does not influence the contact angle formed by a liquid drop placed upon its surface, one can only measure the solid surface's residual polar property, manifested by the energy of adhesion between solid and liquid. This residual polar property is of necessity the dominant component; in most cases this turns out to be its electron donicity. When, by means of contact angle measurements with polar liquids, both electron-accepting and electron-donating potentials are found on a polar solid, it is most likely still partly covered with a polar liquid: usually water. The amount of residual water of hydration of a polar solid follows from its polar (Lewis acid-base) surface tension component (gamma(AB)). The degreeof orientation of the residual water of hydration on a polar solid can be expressed by the ratio of the electron-donating to electron-accepting potentials (gamma(+)/gamma(-)), measured on the hydrated surface.

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Documento generato il 02/12/20 alle ore 18:03:05