摘要:

The alkaline hydrolysis of aromatic and normal aliphatic acid esters have been studied at 25°C In mixed micellar solution of surfactants (Brij35—SDS, Brij35 — DTAB, Brij35—TTAB.Brij35-CTAB. Triton X—100 —CTAB, Triton X— 100 —SDS) with UV spectrophotometry and the method of thermokinetics The critical mice liar concentrations of the corresponding systems have also been measured with UV spectrophotometry in this paper. Kjnln micellar pseudo-phase has been calculated- The ratios of ki.to ki.for all mixed micellar systems Investigated are less than 1. The results indicate that these reactions are inhibited by the mixed micelles and the mixed micelles exhibit a greater effect of Inhibition on the reactions than those do In corresponding single ones. The reason for this is that the micropolarity of the compact Stern layer of mixed micelle is lower, and the micro viscidity Is higher. The Inhibition effect! also depend on the hydrophobic chain length of the surfactants and the hydrophobicity of the substrate.

ISSN:0193-2691    

DOI:10.1080/01932699608943493

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

摘要:

The phase behavior and solubilization of multiphase microemulsions in mixed anionic-calionic surfactant systems were studied for fixed ratios of water to diesel oil and surfactant to alcohol. In the mixed surfactants (sodium oleate + cctyltrimcthylammonium bromide) /diesel oil/ alcohol/water systems, microcmulsion and birefringent phases are formed by adjusting the surfactant ratio e and the cationic weight fraction δ The bicontmuous—→birefringent→o/w microcmulsion transition takes place with dilution for i-pentanol-containing systems. The birefringent region shrinks rapidly with increasing alcohol and/or CTAB weight fractions in total surfactant concentration. The normal solution→w/o microemulsion transition for n-hcxanol systems and only w/o microemulsion for n-octanol systems were observed along the dilution with diesel oil and water. And microemulsion domain enlarges with increasing ε for three alcohol systems. The optimum surfactant concentration γ increases and the corresponding optimum δ decreases with increasing e and the optimum γdecreases with increasing the alcohol chain length from i-pentanol to n-octanol and the optimum δ decreases in the order of i-pentanol > n-octanol > n-hexanol. Conductivity measurements have been performed in the single phase region of the system containing mixed-surfactants and alcohols at 25°C. The conductivity results indicate where a transition takes place and which these different types of phase structure may be in the single-phase of the system containing anionic-cationic mixed-surfactants.

ISSN:0193-2691    

DOI:10.1080/01932699608943494

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

摘要:

The technology developed for surfactant enhanced oil recovery and toxic spill remediation has been applied to the clean-up of JP4 jet fuel spills on air bases. The EACN for JP4 was determined via previously established mathematical formulae and confirmed experimentally. The physical characteristics of several surfactant systems are described within.

ISSN:0193-2691    

DOI:10.1080/01932699608943495

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

ISSN:0193-2691    

DOI:10.1080/01932699608943496

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

ISSN:0193-2691    

DOI:10.1080/01932699608943497

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

ISSN:0193-2691    

DOI:10.1080/01932699608943498

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor

ISSN:0193-2691    

DOI:10.1080/01932699608943499

出版商:Taylor & Francis Group    

年代:1996

数据来源: Taylor