Reply to comments on "on the structure of aggregates of adsorbed surfactants: the surface charge density at the hemimicelle/admicelle transition"

Harwell, Jeffrey H.; Yeskie, M. A.

doi:10.1021/j100345a097

Cited by 12 publications

(7 citation statements)

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“…These concentrations are 10 to 40% of the respective CMCs. At such concentrations, submicellar aggregates at solid-liquid interfaces may be formed, as proposed for different nonbiological models by Fuerstenau and Herrera-Urbina (9), Harwell and colleagues (14,15), and Gu and colleagues (11)(12)(13). Submicellar aggregates were also postulated when concentration-dependent base-catalyzed hydrolysis was observed for a series of amphiphilic betaine esters (33).…”

Section: Fig 2 Effects Of Different Concentrations Of Qacs (Ctab [Amentioning

confidence: 88%

Submicellar complexes may initiate the fungicidal effects of cationic amphiphilic compounds on Candida albicans

Ahlström

Chelminska-Bertilsson

Thompson

et al. 1997

Antimicrob Agents Chemother

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The killing of Candida albicans by a series of amphiphilic quaternary ammonium compounds (QACs) with different hydrocarbon chain lengths was closely related to the binding of the compounds to the cells and damage of the cell membranes. The membrane damage was measured as the level of release of the UV-absorbing material into the medium in which the cells were suspended and as the level of uptake of propidium iodide in individual cells by flow cytometry. It was shown that of the compounds tested, hexadecyltrimethylammonium bromide (cetyltrimethylammonium bromide [CTAB]) bound most efficiently. Tetradecyl betainate chloride (B14), tetradecanoylcholine bromide (C14), tetradecyltrimethylammonium bromide (TTAB), and dodecyltrimethylammonium bromide (DTAB) followed and had declining degrees of binding efficiency. The proportion of CTAB bound was almost total at concentrations up to the critical micelle concentration (CMC) of the compound, whereas that of B14 was somewhat smaller. For the two remaining tetradecyl compounds (C14 and TTAB), still smaller proportions were bound at low concentrations, but the proportions rose disproportionally at increasing concentrations to a distinct maximum at concentrations of 0.2 to 0.5 times the CMC. We propose that interfacial micelle-like aggregates are formed at the cell surface as a step in the binding process. An analogous, but less conspicuous, maximum was seen for DTAB. Thus, great differences in the binding affinity of QACs with different hydrocarbon chains at different concentrations to C. albicans were observed. These differences were related to the CMC of the compound. In contrast, the binding of TTAB to Salmonella typhimurium 395 MS was almost total at low as well as high concentrations until saturation was attained, indicating fundamental differences between binding to the yeast and binding to gram-negative bacteria. The importance of lipid-type complexes or aggregates to the antifungal effect of membrane-active substances are discussed.

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Section: Fig 2 Effects Of Different Concentrations Of Qacs (Ctab [Amentioning

confidence: 88%

Submicellar complexes may initiate the fungicidal effects of cationic amphiphilic compounds on Candida albicans

Ahlström

Chelminska-Bertilsson

Thompson

et al. 1997

Antimicrob Agents Chemother

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“…The use of mixtures of surfactants has been found to greatly influence the CAC value. 25,26,29,30 A study of mixtures of anionic and nonionic surfactant's adsolubilization on alumina was reported by Robert et al 31 and Lopata et al 32 One noteworthy observation was that the nonionic polyethoxylated nonylphenol did not adsorb at all on alumina, but in the presence of 10 mol% anionic surfactant, formation of admicelles (nonionic in nature) took place without any difficulty.…”

Section: 17mentioning

confidence: 97%

“…11,12 One cannot say that the change in the slope of the isotherm is only due to surface charge since such slope changes are seen even in the cases of nonionic surfactants adsorbed on silica. 11,[23][24][25] Since fluorescence and spin probe studies reveal that both the microviscosity and polarity of aggregates are constant from region 1 /region 2 transition through region 3, 26 it will be erroneous to associate the slope change to the change in the morphology of the aggregates.…”

Section: Step 2: Adsolubilization 1617mentioning

confidence: 99%

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Admicellar Polymerization and Its Application in Textiles

Ulman

Shukla

2015

Adv. Polym. Technol.

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This article is an overview of a novel polymerization technique known as admicellar polymerization (ADPM).ADPM is known as a "surface analogue" of emulsion polymerization, and it consists of three main steps that include (1) admicelle formation, (2) adsolubilization, and (3) polymerization. This review encompasses all the applications of ADPM in the field of textiles. ADPM has been used mainly for finishing of textiles, e.g., for achieving flame retardancy, UV protection, water repellency, etc. It has also been used for improving the adhesion of natural fibers used for the reinforcement of polymer matrices. It was observed that though an extensive and constructive research work has been conducted at laboratory level to understand ADPM process and explore its applications, its industrial acceptance in textiles has not been reported yet. Scope for further research has also been discussed in this review article. C 2015 Wiley Periodicals, Inc. Adv Polym Technol 2015, 0, 21556; View this article online at wileyonlinelibrary.com.

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“…The evolution of bilayers has been the subject of controversy between two representative adsorption models (15)(16)(17)(18). The reverse orientation model is derived from experimental data of adsorption isotherms, electrophoresis, and spectroscopy (5,6).…”

Section: Introductionmentioning

confidence: 99%

Adsorption of Sodiumn-Decylbenzenesulfonate onto Alumina: Relationships between Macro- and Microscopic Behavior

Nagashima

Blum

1999

Journal of Colloid and Interface Science

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Reply to comments on "on the structure of aggregates of adsorbed surfactants: the surface charge density at the hemimicelle/admicelle transition"

Cited by 12 publications

References 0 publications

Submicellar complexes may initiate the fungicidal effects of cationic amphiphilic compounds on Candida albicans

Submicellar complexes may initiate the fungicidal effects of cationic amphiphilic compounds on Candida albicans

Admicellar Polymerization and Its Application in Textiles

Adsorption of Sodiumn-Decylbenzenesulfonate onto Alumina: Relationships between Macro- and Microscopic Behavior

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