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Titolo:
Evidence for hydrophobic attraction between latex particles in aqueous systems as investigated by turbidimetry
Autore:
Weiss, A; Ballauff, M;
Indirizzi:
Univ Karlsruhe, Inst Polymer, D-76128 Karlsruhe, Germany Univ Karlsruhe Karlsruhe Germany D-76128 mer, D-76128 Karlsruhe, Germany
Titolo Testata:
COLLOID AND POLYMER SCIENCE
fascicolo: 12, volume: 278, anno: 2000,
pagine: 1119 - 1125
SICI:
0303-402X(200012)278:12<1119:EFHABL>2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Soggetto:
FRACTAL AGGREGATION; CONCENTRATED LATEX; SUSPENSIONS; POLYMERS;
Keywords:
turbidity; light scattering; hydrophobic attraction; structure factor; HMSA;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
25
Recensione:
Indirizzi per estratti:
Indirizzo: Ballauff, M Univ Karlsruhe, Inst Polymer, Kaiserstr 12, D-76128 Karlsruhe,Germany Univ Karlsruhe Kaiserstr 12 Karlsruhe Germany D-76128 Germany
Citazione:
A. Weiss e M. Ballauff, "Evidence for hydrophobic attraction between latex particles in aqueous systems as investigated by turbidimetry", COLLOID P S, 278(12), 2000, pp. 1119-1125

Abstract

We report the evidence for attractive interaction of latex particles whichare covered by poly(ethylene oxide) chains. These particles are suspended in aqueous solutions of ammonium sulfate. The interaction is probed by measurements of the turbidity of the suspensions up to 70 g/l. Turbidity is insensitive to multiple scattering and allows the static structure factor, S(q) [q = (4 pin(0)/lambda (0))sin(theta /2), where theta is the scattering angle, no is the refractive index of the medium and lambda (0) is the wavelength in vacuo], to be determined at small q values. The analysis of S(q) at small q values yields information about possible attraction of the particles. The analysis of the turbidity data furthermore shows that no aggregationtook place in these systems. A weak but long-range attractive interaction was found at ammonium sulfate concentrations of 0.01 and 0.1 M. The relation of this attractive force to hydrophobic forces is discussed.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 02/04/20 alle ore 19:07:53