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Titolo:
Influence of pH on the stability of oil-in-water emulsions stabilized by asplittable surfactant
Autore:
Chen, CM; Lu, CH; Chang, CH; Yang, YM; Maa, JR;
Indirizzi:
Natl Cheng Kung Univ, Dept Chem Engn, Tainan 70101, Taiwan Natl Cheng KungUniv Tainan Taiwan 70101 Chem Engn, Tainan 70101, Taiwan
Titolo Testata:
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
fascicolo: 2-3, volume: 170, anno: 2000,
pagine: 173 - 179
SICI:
0927-7757(20000930)170:2-3<173:IOPOTS>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
OXIDE BLOCK-COPOLYMERS; DEMULSIFICATION EFFICIENCY; DESTRUCTIBLE SURFACTANTS; REMEDIATION; SEPARATION; AQUIFER; FIELD;
Keywords:
demulsification; dynamic interfacial tension; emulsion; emulsion stability; splittable surfactant;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
28
Recensione:
Indirizzi per estratti:
Indirizzo: Chang, CH Natl Cheng Kung Univ, Dept Chem Engn, Tainan 70101, Taiwan Natl Cheng Kung Univ Tainan Taiwan 70101 Tainan 70101, Taiwan
Citazione:
C.M. Chen et al., "Influence of pH on the stability of oil-in-water emulsions stabilized by asplittable surfactant", COLL SURF A, 170(2-3), 2000, pp. 173-179

Abstract

A laboratory study was conducted to evaluate the effect of pH on the stability of oil-in-water emulsions stabilized by a commercial splittable surffactant Triton SP-190 by comparison with the results obtained by a common surfactant Triton X-100. The emulsion stability was explored by measuring the volume of oil phase separated and the size of the dispersed droplets. It was found that the addition of inorganic acids did not significantly affect the stability of emulsions stabilized by Triton X-100, but had a profound influence on the stability of emulsions stabilized by Triton SP-190. Moreover, the droplet size of a Triton X-100-stabilized emulsion and its dynamic interfacial activity were insensitive to acids. However, at lower pH the droplet size of the emulsions stabilized by Triton SP-190 was considerably increased. From the dynamic interfacial tension measurements the dynamic interfacial activity of Triton SP-190 at the oil/water interface was found to be strongly inhibited by the addition of acids, resulting in a slower decreasing rate of dynamic interfacial tension. The results demonstrate that the dramatic destabilization of Triton SP-190-stabilized emulsions could be realized by the use of acids, which evidently changed the interfacial propertiesof the surfactant and resulted in a higher coalescence rate of oil droplets. (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 07/08/20 alle ore 00:48:18