Interaction of Tyrosine Analogues with Quaternary Ammonium Head Groups at the Micelle/Water Interface and Contrasting Effect of Molecular Folding on the Hydrophobic Outcome and End-Cap Geometry

2018 ◽  
Vol 122 (8) ◽  
pp. 2355-2367 ◽  
Author(s):  
Gulmi Chakraborty ◽  
Madhurima Paul Chowdhury ◽  
P. A. Hassan ◽  
Koji Tsuchiya ◽  
Kanjiro Torigoe ◽  
...  
Keyword(s):  
Quaternary Ammonium ◽  
Water Interface ◽  
Head Groups ◽  
Contrasting Effect ◽  
Molecular Folding

scholarly journals Facile preparation of porefilled membranes based on poly(ionic liquid) with quaternary ammonium and tertiary amine head groups for AEMFCs

2019 ◽  
Vol 338 ◽  
pp. 58-65 ◽  
Author(s):  
Feng Xie ◽  
Zhigang Shao ◽  
Xueqiang Gao ◽  
Jinkai Hao ◽  
Wei Song ◽  
...  
Keyword(s):  
Ionic Liquid ◽  
Tertiary Amine ◽  
Quaternary Ammonium ◽  
Head Groups ◽  
Facile Preparation ◽  
Poly Ionic Liquid

The influence of electrolytes on gaseous monolayers II. Ionized films

1955 ◽  
Vol 232 (1189) ◽  
pp. 159-172 ◽  
Keyword(s):  
Surface Potential ◽  
Quaternary Ammonium ◽  
Alkyl Chain ◽  
Electrolyte Concentration ◽  
Ammonium Ion ◽  
Water Interface ◽  
Ammonium Halides ◽  
Air Water Interface ◽  
Good Agreement ◽  
The Ideal

An equation of state for a charged monolayer spread on an aqueous solution of a 1:1 electrolyte at 20°C in the absence of cohesive interactions has been derived, namely II = 2 kT / A-A o + 6.10√ c cosh sinh -1 133/ A √ c 6.10√ c . It has been found to apply to soluble charged films at hydrocarbon/water interfaces. In the case of insoluble monolayers of both alkyl quaternary ammonium halides and sodium alkyl sulphates at the hydrocarbon/water interface there is evidence of considerable ( ~50 %) ion-pair association, and this appears to be even further enhanced at the air/water interface at least for sulphate films. Surface potentials, measured by both the radioactive electrode and vibrating plate condenser techniques have been found to be in good agreement. The surface potential of sulphate monolayers in contrast to the ideal behaviour of quaternary ammonium films has been found to be dependent not only on the electrolyte concentration and film area but also on the nature of the interface, the nature of the substrate and at the air/water interface on the chain length. This has been attributed to a reorientation of the film molecules at the interface. Differences in the surface potential behaviour of sulphate and quaternary ammonium films are explained by suggesting that whereas with the sulphate film restricted rotation about the C—O bond can lead to different configurations of the sulphate ion with respect to the alkyl chain, only one configuration is possible for the symmetrical quaternary ammonium ion. Surface potential evidence indicates that contrary to what has been suggested previously, sulphate monolayers are completely dissociated in the acid-base sense.

Contrasting effect of 1-butanol and 1, 4-butanediol on the triggered micellar self-assemblies of C16-type cationic surfactants

2021 ◽  
Author(s):  
Vinod Kumar ◽  
Rajni Verma ◽  
Dwarkesh Satodia ◽  
Debes Ray ◽  
Ketan Kuperkar ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Cationic Surfactant ◽  
Self Assembly ◽  
Cationic Surfactants ◽  
Alkyl Chain ◽  
Cetylpyridinium Bromide ◽  
Quaternary Salts ◽  
Head Groups ◽  
Contrasting Effect ◽  
Cetyltrimethylammonium Tosylate

Self-assembly in aqueous solutions of three quaternary salts based C16-type cationic surfactant with different polar head groups and identical carbon alkyl chain viz., cetylpyridinium bromide (CPB), cetyltrimethylammonium tosylate (CTAT), and...

Lateral interactions among phospholipid head groups at the heptane/water interface

Langmuir ◽  
1988 ◽  
Vol 4 (1) ◽  
pp. 200-209 ◽  
Author(s):  
Dirk Stigter ◽  
Ken A. Dill
Keyword(s):  
Water Interface ◽  
Lateral Interactions ◽  
Head Groups

scholarly journals Antimicrobial Polyethylene through Melt Compounding with Quaternary Ammonium Salts

2017 ◽  
Vol 2017 ◽  
pp. 1-10 ◽  
Author(s):  
Fernanda F. Rossetti ◽  
Konstantin Siegmann ◽  
Joachim Köser ◽  
Irene Wegner ◽  
Ismail Keskin ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
Quaternary Ammonium ◽  
Contact Angles ◽  
Warm Water ◽  
Binding Assays ◽  
Leaching Behavior ◽  
Melt Compounding ◽  
Angle Measurements ◽  
Head Groups ◽  
Contact Angle Measurements

Selected mono- and bicationic quats were compounded with polyethylene. The physicochemical surface properties, leaching behavior, and antibacterial activity of such modified samples were investigated. Contact angle measurements and fluorescein binding assays showed the presence of quaternary ammonium groups at the surface. After storing the samples in 50°C warm water for 30 days, several were still antimicrobially active. No correlation between the number of exposed N+ head groups after leaching and the antibacterial activity was observed. There is however a qualitative correlation of the antibacterial activity with the contact angles and surface concentrations of N+ before leaching/storing in warm water.

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