Study on Mixed Micelles of Cationic Gemini Surfactants Having Hydroxyl Groups in the Spacers with Conventional Cationic Surfactants: Effects of Spacer Group and Hydrocarbon Tail Length

2013 ◽  
Vol 52 (17) ◽  
pp. 5895-5905 ◽  
Author(s):  
Sonu ◽  
Amit K. Tiwari ◽  
Subit K. Saha
Keyword(s):  
Cationic Surfactants ◽  
Mixed Micelles ◽  
Gemini Surfactants ◽  
Tail Length ◽  
Hydroxyl Groups ◽  
Spacer Group ◽  
Cationic Gemini Surfactants

Asymmetric cationic gemini surfactants: an improved synthetic procedure and the micellar and surface properties of a homologous series in the presence of simple salts

2018 ◽  
Vol 96 (7) ◽  
pp. 672-680
Author(s):  
David J. Greencorn ◽  
Victoria M. Sandre ◽  
Emily K. Piggott ◽  
Michael R. Hillier ◽  
A. James Mitchell ◽  
...  
Keyword(s):  
Cationic Surfactants ◽  
Gemini Surfactants ◽  
Aggregate Size ◽  
Morphological Properties ◽  
Micellar Properties ◽  
Micelle Structure ◽  
Surfactant Solutions ◽  
Synthetic Procedure ◽  
Cationic Gemini Surfactants ◽  
Hydrophobic Chain

The micellar and morphological properties of symmetric, cationic gemini surfactants have been well studied in the literature as a function of nature and type of the spacer group and the length and type of hydrophobic chain. In this paper, we have examined the effects of tail asymmetry on the properties of a series of cationic surfactants, the N-alkyl-1-N′-alkyl-2-N,N,N′,N′-tetramethyldiammonium dibromide. A novel synthetic method is used to prepare a series of these surfactants and the consequences of asymmetry on micellar properties are presented. This new method has been shown to be more efficient, with higher yields of the asymmetric surfactants than the yields of the accepted literature method. The critical micelle concentration values and the micelle sizes of the asymmetric gemini surfactants, 12-4-12, 12-4-10, 12-4-8, and 12-4-6 gemini surfactants, were obtained from conductivity and dynamic light scattering. With increasing chain asymmetry, the size of the micelle increased due to the formation of loose micelles. The addition of NaCl and Na2SO4 to the surfactant solutions increased the aggregate size, and this effect was more pronounced with increasing salt concentrations. These results are interpreted in terms of the effect these ions have on the “compactness” of the micelle structure.

Contribution of 1H NMR to the investigation of the adsorption of cationic Gemini surfactants with oligooxyethylene spacer group onto silica

2009 ◽  
Vol 331 (2) ◽  
pp. 281-287 ◽  
Author(s):  
Anissa Bendjeriou-Sedjerari ◽  
Gaelle Derrien ◽  
Clarence Charnay ◽  
Jerzy Zajac ◽  
Louis Charles De Menorval ◽  
...  
Keyword(s):  
1H Nmr ◽  
Gemini Surfactants ◽  
Spacer Group ◽  
Cationic Gemini Surfactants

scholarly journals Gemini ester quat surfactants and their biological activity

2013 ◽  
Vol 18 (1) ◽  
Author(s):  
Jacek Łuczyński ◽  
Renata Frąckowiak ◽  
Aleksandra Włoch ◽  
Halina Kleszczyńska ◽  
Stanisław Witek
Keyword(s):  
Biological Activity ◽  
Hemolytic Activity ◽  
Cationic Surfactants ◽  
Gemini Surfactants ◽  
Hydrocarbon Chain ◽  
Surfactant Molecule ◽  
Clear Correlation ◽  
Cationic Gemini Surfactants ◽  
Ester Quat ◽  
Surface Active Compounds

AbstractCationic gemini surfactants are an important class of surface-active compounds that exhibit much higher surface activity than their monomeric counterparts. This type of compound architecture lends itself to the compound being easily adsorbed at interfaces and interacting with the cellular membranes of microorganisms. Conventional cationic surfactants have high chemical stability but poor chemical and biological degradability. One of the main approaches to the design of readily biodegradable and environmentally friendly surfactants involves inserting a bond with limited stability into the surfactant molecule to give a cleavable surfactant. The best-known example of such a compound is the family of ester quats, which are cationic surfactants with a labile ester bond inserted into the molecule. As part of this study, a series of gemini ester quat surfactants were synthesized and assayed for their biological activity. Their hemolytic activity and changes in the fluidity and packing order of the lipid polar heads were used as the measures of their biological activity. A clear correlation between the hemolytic activity of the tested compounds and their alkyl chain length was established. It was found that the compounds with a long hydrocarbon chain showed higher activity. Moreover, the compounds with greater spacing between their alkyl chains were more active. This proves that they incorporate more easily into the lipid bilayer of the erythrocyte membrane and affect its properties to a greater extent. A better understanding of the process of cell lysis by surfactants and of their biological activity may assist in developing surfactants with enhanced selectivity and in widening their range of application.

scholarly journals DNA conformational changes induced by cationic gemini surfactants: the key to switching DNA compact structures into elongated forms

RSC Advances ◽  
2015 ◽  
Vol 5 (37) ◽  
pp. 29433-29446 ◽  
Author(s):  
Elia Grueso ◽  
Edyta Kuliszewska ◽  
Emilio Roldan ◽  
Pilar Perez-Tejeda ◽  
Rafael Prado-Gotor ◽  
...  
Keyword(s):  
Conformational Changes ◽  
Gemini Surfactants ◽  
Tail Length ◽  
Cationic Gemini Surfactants ◽  
Dna Conformational Changes

The extent of DNA decompaction induced by m-s-m gemini surfactants depend on the surfactant's tail length and on spacer's length.

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