scholarly journals Silver Nanoparticles Stabilised by Cationic Gemini Surfactants with Variable Spacer Length

Molecules ◽  
2017 ◽  
Vol 22 (10) ◽  
pp. 1794 ◽  
Author(s):  
Martin Pisárčik ◽  
Josef Jampílek ◽  
Miloš Lukáč ◽  
Renáta Horáková ◽  
Ferdinand Devínsky ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Gemini Surfactants ◽  
Spacer Length ◽  
Cationic Gemini Surfactants

scholarly journals Surface tension study of cationic gemini surfactants binding to DNA

2014 ◽  
Vol 12 (5) ◽  
pp. 577-585 ◽  
Author(s):  
Martin Pisárčik ◽  
Ferdinand Devínsky
Keyword(s):  
Gemini Surfactant ◽  
Gemini Surfactants ◽  
Adsorption Behaviour ◽  
Binding Properties ◽  
Simple Method ◽  
Spacer Length ◽  
Cationic Gemini Surfactants ◽  
Methylene Groups ◽  
Weak Adsorption ◽  
Surface Tension Study

AbstractBinding of cationic gemini surfactants alkanediyl-a-ω-bis(dimethyldodecylammonium bromides) with variable polymethylene spacer length ranging from 2 to 12 methylene groups to DNA in NaBr solution is investigated utilizing the tensiometry method. A simple method is presented for calculating the number of surfactant molecules bound to DNA. The results are evaluated in terms of the gemini surfactant spacer length, showing that gemini molecules with either short spacers (2 methylene groups) or long spacers are most efficiently adsorbed to DNA. A weak adsorption to DNA was found for gemini molecules with a medium spacer length (6 methylene groups in the spacer). The binding properties of cationic gemini surfactants as a function of spacer length are consistent with the results obtained by other experimental methods (dynamic light scattering measurements, fluorescence spectroscopy), indicating identical adsorption behaviour of gemini molecules as a function of the spacer length.

Self-assembly of cationic gemini surfactants, alkanediyl-bis-(dimethyldodecyl-ammonium bromide), in cyclohexane: effects of spacer length on their association into reverse lyotropic liquid crystalline or reverse vesicles

Soft Matter ◽  
2018 ◽  
Vol 14 (5) ◽  
pp. 734-741 ◽  
Author(s):  
Shenglu Deng ◽  
Jianxi Zhao
Keyword(s):  
Self Assembly ◽  
Liquid Crystalline ◽  
Gemini Surfactant ◽  
Gemini Surfactants ◽  
Ammonium Bromide ◽  
Spacer Length ◽  
Cationic Gemini Surfactants ◽  
Reverse Vesicles

An increase in the spacer length of the gemini surfactant 12-s-12 strongly influenced the aggregation of the surfactant in cyclohexane.

Oil/Water Interfacial Tension in the Presence of Novel Polyoxyethylene Cationic Gemini Surfactants: Impact of Spacer Length, Unsaturation, and Aromaticity

2020 ◽  
Vol 34 (5) ◽  
pp. 5545-5552 ◽  
Author(s):  
Lionel Talley Fogang ◽  
Muhammad Shahzad Kamal ◽  
S. M. Shakil Hussain ◽  
Shams Kalam ◽  
Shirish Patil
Keyword(s):  
Interfacial Tension ◽  
Gemini Surfactants ◽  
Spacer Length ◽  
Cationic Gemini Surfactants ◽  
Oil Water

scholarly journals The Synthesis, Self-Assembled Structures, and Microbicidal Activity of Cationic Gemini Surfactants with Branched Tridecyl Chains

Molecules ◽  
2019 ◽  
Vol 24 (23) ◽  
pp. 4380 ◽  
Author(s):  
Martin Pisárčik ◽  
Matúš Pupák ◽  
Miloš Lukáč ◽  
Ferdinand Devínsky ◽  
Lukáš Hubčík ◽  
...  
Keyword(s):  
Gemini Surfactants ◽  
Biological Properties ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
Spacer Length ◽  
Microbicidal Activity ◽  
Alkyl Chains ◽  
Aggregation Behaviour ◽  
Cationic Gemini Surfactants ◽  
Methylene Groups

Cationic gemini surfactants with polymethylene spacer and linear alkyl chains containing an even number of carbon atoms have been extensively studied in the recent past, with the emphasis put on the determination of their aggregation behaviour in aqueous solution and their biological properties. However, the information on the aggregation of branched gemini surfactants with an odd number of carbon atoms in their alkyl chains is only sparsely reported in the literature. To help cover this gap in the research of cationic gemini surfactants, a series of branched bisammonium cationic gemini surfactants with an odd number of carbon atoms in alkyl chains (tridecane-2-yl chains) and a polymethylene spacer with a variable length ranging from 3 to 12 carbon atoms have been synthesized and investigated. Critical micelle concentration, which was determined by three methods, was found to be in the order 10−4 mol/L. A comparison of the obtained data of the novel series of tridecyl chain geminis with those of gemini surfactants with dodecyl chains and an identical spacer structure revealed that structural differences between both series of gemini surfactants result in different aggregation and surface properties for surfactants with 6 and 8 methylene groups in the spacer (N,N’-bis(tridecane-2-yl)-N,N,N’,N’-tetramethylhexane-1,6-diaminium dibromide and N,N’-bis(tridecane-2-yl)-N,N,N’,N’-tetramethyloctane-1,8-diaminium dibromide) with the cmc values 8.2 × 10−4 mol/L and 6.5 × 10−4 mol/L, respectively, as determined by surface tension measurements. Particle size analysis showed the formation of small stable spherical micelles in the interval between 2.8 and 5 nm and with zeta potential around +50 mV, which are independent of surfactant concentration and increase with the increasing spacer length. Microbicidal activity of 13-s-13 gemini surfactants was found to be efficient against Gram-positive, Gram-negative bacteria and yeast.

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