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Titolo:
Comparisons of the effects of pH on the interfacial tension-lowering activity of surfactants Triton X-100 and Triton SP-190
Autore:
Chen, CM; 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: 3, volume: 174, anno: 2000,
pagine: 357 - 365
SICI:
0927-7757(200012)174:3<357:COTEOP>2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Soggetto:
IN-OIL EMULSIONS; OXIDE BLOCK-COPOLYMERS; DEMULSIFICATION EFFICIENCY; DESTRUCTIBLE SURFACTANTS; CLEAVABLE SURFACTANTS; 1,3-DIOXANE RING; REMEDIATION; SEPARATION; PROTEIN; AQUIFER;
Keywords:
dynamic adsorption; dynamic interfacial tension; interfacial tension; oil/water interface; splittable surfactant;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
35
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., "Comparisons of the effects of pH on the interfacial tension-lowering activity of surfactants Triton X-100 and Triton SP-190", COLL SURF A, 174(3), 2000, pp. 357-365

Abstract

A comparative study was conducted to investigate the effects of pH on the equilibrium and dynamic interfacial tension-lowering activity of a commercial splittable surfactant Triton SP-190 and a common surfactant Triton X-100at the n-pentadecane/water interface. Equilibrium and dynamic interfacial tensions at the interface of n-pentadecane/aqueous phase containing surfactants were measured by using a Wilhelmy plate tensiometer and a drop volume tensiometer, respectively. It was found that the addition of inorganic acids did not have an effect on the equilibrium and dynamic interfacial tension-lowering activity of Triton X-100 at the interface. However, though the equilibrium interfacial tension-lowering activity of Triton SP-190 was not significantly affected by acids, the dynamic interfacial tension-lowering activity of Triton SP-190 was strongly inhibited at lower pH, resulting in a slower decreasing rate of dynamic interfacial tension. This phenomenon mightbe explained by the presence of minor surface-active components in the commercial Triton SP-190 surfactant, which dominate the equilibrium interfacial tension behavior at the interface and are not affected by acids. Based onthe pH-dependent dynamic interfacial tension data, the percentages of the Triton SP-190 surfactant split under acidic conditions were then estimated. Moreover, the influence of pH was considerably enhanced at small adsorption times and low Triton SP-190 concentrations. (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 15/07/20 alle ore 13:57:48