Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
Applications of colloidal force measurements using a microcollider apparatus to oil sand studies
Autore:
Wu, X; Laroche, I; Masliyah, J; Czarnecki, J; Dabros, T;
Indirizzi:
Syncrude Canada Ltd, Edmonton Res Ctr, Edmonton, AB T6N 1H4, Canada Syncrude Canada Ltd Edmonton AB Canada T6N 1H4 monton, AB T6N 1H4, Canada Univ Alberta, Dept Chem & Mat Engn, Edmonton, AB T6G 2G2, Canada Univ Alberta Edmonton AB Canada T6G 2G2 ngn, Edmonton, AB T6G 2G2, Canada CANMET, Devon, AB T0C 1E0, Canada CANMET Devon AB Canada T0C 1E0CANMET, Devon, AB T0C 1E0, Canada
Titolo Testata:
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
fascicolo: 1-2, volume: 174, anno: 2000,
pagine: 133 - 146
SICI:
0927-7757(20001115)174:1-2<133:AOCFMU>2.0.ZU;2-G
Fonte:
ISI
Lingua:
ENG
Soggetto:
PARTICLE SCATTERING; HYDRODYNAMIC FORCE; BITUMEN DROPLETS; WATER DROPLETS; LATEX SPHERES; CRUDE-OIL; EMULSIONS; COLLISIONS; STABILITY; ANTIBODY;
Keywords:
colloidal force measurements; oil sand studies; microcollider;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
38
Recensione:
Indirizzi per estratti:
Indirizzo: Wu, X Syncrude Canada Ltd, Edmonton Res Ctr, 9421 17th Ave, Edmonton, AB T6N 1H4, Canada Syncrude Canada Ltd 9421 17th Ave Edmonton AB Canada T6N 1H4 Canada
Citazione:
X. Wu et al., "Applications of colloidal force measurements using a microcollider apparatus to oil sand studies", COLL SURF A, 174(1-2), 2000, pp. 133-146

Abstract

Two colloidal force measurement techniques have been applied to oil sand studies both using the same apparatus called the microcollider. The techniques are colloidal particle scattering method for repulsion-dominant systems and hydrodynamic force balance method for attraction-dominant systems. The former is based on calculating the colloidal forces from the magnitude of particle-particle collision trajectory deflections. The latter is based on separating a colloidal doublet with increasing shear and calculating the maximum attractive force at the onset of the doublet breakup. Both methods involve the microscopic observation on two individual particles. The methods are also well suited to emulsion systems where the interaction forces as small as 10(-13) N between two droplets can be detected. In oil sand research,two stable emulsions: water-in-diluted bitumen and bitumen-in-water have been receiving considerable attention because of their detrimental effects on the industrial process. The droplet-droplet forces and the emulsion stability mechanism were determined for both emulsions using either one of the techniques. For the w/o emulsion, steric repulsion is the main contributor to the emulsion stability. For the o/w emulsion, all interactions are exclusively DLVO-type forces and the electrostatic force plays a major role in stabilizing the emulsion. Isolated protrusions of tens of nanometers in thickness have also been detected on bitumen surfaces. The protrusions enhance the repulsive force at a long distance but reduce it near the energy barrier, a useful feature that might help in destabilizing the system. (C) 2000 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/12/20 alle ore 01:34:46