Crystalline structures and mesomorphic properties of gemini diammonium surfactants with a pendant hydroxyl group

Wei, Zheng; Wei, Xilian; Sun, Dongmei; Liu, Jiuqiang; Tang, Xiaojuan

doi:10.1016/j.jcis.2010.11.009

Cited by 36 publications

(23 citation statements)

References 45 publications

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“…1). According to the experimental data of differential scanning calorimetry (DSC), 18 it was determined that a smectic B phase is present from 83 to 123.2 C; above 123.2 C it is a lamellar liquid crystalline phase (La).…”

Section: Resultsmentioning

confidence: 99%

Phase and rheological behavior of a gemini cationic surfactant aqueous system

et al. 2012

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The phase behavior of aqueous system of a gemini-type cationic surfactant, N,N 0 -dodecyl-2-hydroxyl-N,N,N 0 ,N 0 -tetramethyl diammonium dichloride (simply written as 12-3(OH)-12(2Cl)), has been investigated by various complementary methods. A micellar solution region, a hexagonal liquid crystal phase region and two transition regions in the phase diagram are confirmed by SAXS and polarizing microscopy. Over the concentration range, 10-40 (wt%) of 12-3(OH)-12(2Cl), the viscoelastic properties of 12-3(OH)-12(2Cl) solutions at different temperatures have been determined using steady state and frequency sweep rheological measurements. The results from the FF-TEM study are in good agreement with the predictions from steady shear and dynamic rheology in which the large difference in the rheological behavior between 12-3(OH)-12(2Cl) and 12-3(OH)-12(2Br) at the same conditions might be mainly attributed to the role of the intermolecular hydrogen bonding which occurred between the hydroxyl substituted spacers and chloride counter ion and crystallization water molecule.

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Section: Resultsmentioning

confidence: 99%

Phase and rheological behavior of a gemini cationic surfactant aqueous system

et al. 2012

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“…Other factors being equal, the structure strength of the smectic phase is strongly dependent on the length of alkyl chain and the degree of interdigitation among alkyl chains. 30 It indicates that R 16 HTAX have a similar or lesser extent of chain interdigitation between ionic planes, as compared to R 14 HTAX. The major difference in the mechanical spectra of R n HTABr and R n HTABF 4 consists of the fact that the former exhibit higher values of the viscoelastic functions G 0 and G 00 .…”

Section: Rheological Properties Of the Smectic Phasementioning

confidence: 97%

Ionic liquid crystals of quaternary ammonium salts with a 2-hydroxypropoxy insertion group

Wei

Wang

et al. 2011

J. Mater. Chem.

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“…For e.g ., based on TGA data, the T ONSET values are 185, 186, and 203 °C for C 12 ‐E2O2– 12 , C 14 ‐E2O2– 14 , and C 16 ‐E2O2‐C 16 gemini surfactants, respectively. The thermal stability of C m ‐E2O2‐C m geminis is greater than that of conventional surfactants (Jurašin et al, 2011; Wei et al, 2011). All the synthesized C m ‐E2O2‐C m gemini surfactants exhibited excellent thermal stability with high decomposition temperatures.…”

Section: Resultsmentioning

confidence: 99%

An Insight View on Synthetic Protocol, Surface Activity, and Biological Aspects of Novel Biocompatible Quaternary Ammonium Cationic Gemini Surfactants

Akram

Lal

Osama

et al. 2020

J Surfact & Detergents

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In this study, we prepared a novel series of diester-functionalized cationic gemini surfactants (C m-E2O2-C m) containing ethylene oxide as a spacer with varying alkyl chain lengths and characterized by 1 H NMR, FT-IR, elemental analysis, and ESI-MS. The physicochemical properties of the geminis were explored by tensiometry, fluorescence, dye solubilization, and Krafft point. These geminis acquire superior surface activity than the conventional surfactants. Fluorescence spectroscopy analysis affirmed that the micropolarity and aggregation number of micelles diminished with increase in the alkyl chain length. These geminis represent a new group of amphiphiles of considerably high biodegradability, better cleavability, and low toxicity as assessed by BOD test, FT-IR analysis, and HC 50 analysis, respectively. They also showed significant level of antimicrobial activity toward some specified bacterial strains of Gram-positive and Gram-negative by using agar well diffusion method. Furthermore, the thermogravimetric analysis provided information regarding thermal stabilities of the newly synthesized gemini surfactants. Keywords C m-E2O2-C m gemini surfactants Á Physicochemical properties Á Antimicrobial activities Á TGA

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Crystalline structures and mesomorphic properties of gemini diammonium surfactants with a pendant hydroxyl group

Cited by 36 publications

References 45 publications

Phase and rheological behavior of a gemini cationic surfactant aqueous system

Phase and rheological behavior of a gemini cationic surfactant aqueous system

Ionic liquid crystals of quaternary ammonium salts with a 2-hydroxypropoxy insertion group

An Insight View on Synthetic Protocol, Surface Activity, and Biological Aspects of Novel Biocompatible Quaternary Ammonium Cationic Gemini Surfactants

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