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Titolo:
Disruption of polystyrene latex aggregates in capillary flow
Autore:
Tang, S; McFarlane, CM; Zhang, Z;
Indirizzi:
Univ London Imperial Coll Sci Technol & Med, Dept Chem Engn & Chem Technol, London SW7 2BY, England Univ London Imperial Coll Sci Technol & Med London England SW7 2BY gland Univ Birmingham, Sch Chem Engn, Birmingham B15 2TT, W Midlands, England Univ Birmingham Birmingham W Midlands England B15 2TT W Midlands, England
Titolo Testata:
COLLOID AND POLYMER SCIENCE
fascicolo: 5, volume: 278, anno: 2000,
pagine: 450 - 458
SICI:
0303-402X(200005)278:5<450:DOPLAI>2.0.ZU;2-N
Fonte:
ISI
Lingua:
ENG
Soggetto:
PROVOKED CLUSTER FRAGMENTATION; LIMITED AGGREGATION; ANIMAL-CELLS; PARTICLES; STRENGTH; COLLOIDS; MODES;
Keywords:
disruption; aggregates; size; fractal dimension; capillary flow;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
27
Recensione:
Indirizzi per estratti:
Indirizzo: Tang, S Univ London Imperial Coll Sci Technol & Med, Dept Chem Engn & ChemTechnol, London SW7 2BY, England Univ London Imperial Coll Sci Technol & Med London England SW7 2BY
Citazione:
S. Tang et al., "Disruption of polystyrene latex aggregates in capillary flow", COLLOID P S, 278(5), 2000, pp. 450-458

Abstract

Disruption of polystyrene latex aggregates, formed in 1 M citric acid/phosphate buffer solution at pH 3.8 through diffusion-limited colloid aggregation (DLCA) and in 0.2 M NaCl solution at pH 5.5 through reaction-limited colloid aggregation (RLCA), was studied with respect to aggregate size and fractal nature. This was achieved using small-angle laser scattering in conjunction with a specially designed sampling method, which brought about the elimination of the disruption of the aggregates caused by a commercial stirrer sample unit. Aggregations were carried out in a mixture of deuterium oxide and water instead of water alone as a solvent to minimise sedimentation resulting from the differences in density between the latex particles and the electrolytes. An initial "steady state" in terms of aggregate size and fractal dimension was found to occur after around 20 min and 2 days for DLCA and RLCA aggregates, respectively, at 25 degrees C. No aggregate disruptionwas detected for DLCA and RLCA aggregates after their passing through a capillary tube for shear rates up to 1584 and 2694 s(-1), respectively. At higher shear rates, significant decreases in the aggregate volume-mean diameter, D[4, 3], occurred after shearing. The degree of reduction in D[4, 3] was larger for DLCA aggregates in comparison to RLCA aggregates. The results would suggest that DLCA aggregates were more subject to disruption during shearing. A high degree of disruption was observed in turbulent Row for bothaggregates.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 30/03/20 alle ore 00:35:35