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.

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.

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

Aqueous solution behaviour and solubilisation properties of octadecyl cationic gemini surfactants and their comparison with their amide gemini analogues

Soft Matter ◽  
2018 ◽  
Vol 14 (5) ◽  
pp. 754-764 ◽  
Author(s):  
J. Woch ◽  
J. Iłowska ◽  
Z. Hordyjewicz-Baran ◽  
S. Arabasz ◽  
B. Kaczmarczyk ◽  
...  
Keyword(s):  
Aqueous Solution ◽  
Gemini Surfactants ◽  
Amide Group ◽  
Aggregation Behaviour ◽  
Cationic Gemini Surfactants ◽  
Solution Behaviour

The aggregation behaviour of octadecyl gemini surfactants in water was related to the behaviour of their amide group containing analogues.

ELABORATION AND EVALUATION OF A COMPOSITE BONE SUBSTITUTE BASED ON β-TCP/DCPD AND PHBV, PRELIMINARY RESULTS

2016 ◽  
Vol 28 (05) ◽  
pp. 1650031 ◽  
Author(s):  
Monia Trimeche ◽  
Hichem Smaoui ◽  
Ridha Ben Cheikh ◽  
Mahmoud Smida ◽  
Tarek Rebaï ◽  
...  
Keyword(s):  
Bone Substitute ◽  
Degradation Kinetics ◽  
Weight Ratio ◽  
Morphological Characteristics ◽  
Biological Properties ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
Segmental Defect ◽  
Molding Process

Objective: In the present study, we investigate the biological performance of a calcium phosphate ceramics (CPC) bone substitute combined with poly-hydroxybutyrate-co-hydroxyvalerate (PHBV). Materials and Methods: A particulate CPC [45% beta-tricalcium phosphate ([Formula: see text]-TCP) and 55% of dihydrated dicalcium phosphate (DCPD)] was incorporated into a biodegradable copolymer PHBV. Two series of the composite, 1 and 2, with CPC–PHBV weight ratios of (40%–60% and 60%–40%), respectively, were prepared using chloroform for dissolving the polymer and a pressure molding process for shaping the composite samples. After particle size analysis, the two composites were characterized by scanning electron microscopy (SEM) and energy dispersive spectrometry (EDS). In a second step, a 10[Formula: see text]mm bony segmental defect created in the tibias of 20 New Zealand White Rabbits was filled randomly with either composite 1 for group 1 or composite 2 for group 2. There were 10 animals in each group. Clinical, radiological and histological assessments were then carried out to evaluate the biological properties of developed CPC–PHBV composites. Results: For both variants of the developed CPC–PHBV biocomposite, there was evidence of osseous consolidation within three months. An in vivo investigation revealed the biological properties of the biocomposite, namely, biocompatibility, bioactivity, biodegradability and osteoconductivity. The morphological characteristics, granule size and chemical composition, were indeed found to be favorable for osseous cell development. This study likewise showed lower mortality for the variant with weight ratio (40%CPC–60%PHBV). Conclusion: An in vivo investigation revealed that the new biomaterial composed of CPC and PHBV exhibits manifest osteoconductivity and bioactivity with better degradation kinetics than the CPC. Moreover, the variant with 40%CPC/60%PHBV appeared more resistant to infection than the 60%CPC/40%PHBV which is an indicator of biocompatibility.

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 Propriedades do Solo da Bacia Hidrográfica do Rio Catorze que Intensificam a Erosão Laminar (Soil Properties of Catorze River Watershed that Enhance Erosion Laminar)

2012 ◽  
Vol 5 (1) ◽  
pp. 160 ◽  
Author(s):  
Juliane Mônica Ruthes ◽  
Júlio Caetano Tomazoni ◽  
Elisete Guimarães ◽  
Tayoná Cristina Gomes
Keyword(s):  
Soil Properties ◽  
Soil Classification ◽  
Biological Properties ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
Rectangular Grid ◽  
River Watershed ◽  
Physical Chemical ◽  
K Factor ◽  
Control And Prevention

Este estudo foi desenvolvido tendo como objetivo estimar a suscetibilidade à erosão dos solos da bacia hidrográfica do rio Catorze, no município de Francisco Beltrão – PR. Coletaram-se amostras ao longo da Bacia, em horizonte superficial, e posteriormente, desenvolveu-se análise granulométrica. Partindo dos resultados da análise, utilizou-se da equação desenvolvida por Denardin (1990), que considera os teores óxido de alumínio, areia, matéria orgânica, e permeabilidade do solo, para estimar os valores do fator K (erodibilidade). Através do software Spring 5.1.8, classificaram-se os solos da Bacia, e utilizando programa LEGAL, atribuiu-se os valores de K para os solos classificados, resultando em uma grade retangular com os valores do fator erodibilidade de toda a Bacia. Produziram-se cartas de classificação do solo e do fator erodibilidade, com o auxílio do software Scarta 5.1.8. As equações para estimar os valores do fator erodibilidade, dependem das características físicas, químicas e biológicas dos solos e são desenvolvidas na tentativa de minimizar erros e se aproximar de um valor real do fator K. Os valores encontrados para o fator erodibilidade na bacia do rio Catorze, variam entre 0,0611 e 0,1238 t.ha-1.h.mm-1.ha.MJ-1, mostrando uma erodibilidade elevada, principalmente para os neossolos, que são solos menos desenvolvidos. Esses valores encontrados para o fator K mostram a necessidade de uma adequação no uso e nas práticas conservacionistas ao longo da Bacia, utilizando para isso, o mapa da erodibilidade desenvolvido através de geoprocessamento, onde é possível visualizar as áreas mais suscetíveis à erosão, podendo aplicar o controle e prevenção dos processos erosivos. Palavras-chave: Erodibilidade, fator K, bacia hidrográfica  Soil Properties of Catorze River Watershed that Enhance Erosion Laminar  ABSTRACT This study was developed aiming to estimate the susceptibility to soil erosion of Catorze River watershed, in the municipality of Francisco Beltrão - PR. Samples were collected throughout the basin in the surface horizon, and subsequently developed particle size analysis. Based on the results of the analysis, we used the equation developed by Denardin (1990), which considers the levels of aluminum oxide, sand and organic matter, and the permeability of the soil, and found values of the K factor (erodibility). Through the Spring software 5.1.8, the soils were classified Basin, and using LEGAL program was given the values of K for soils classified, resulting in a rectangular grid with the values of the erodibility factor of the entire basin. Was produced letters soil classification and erodibility of the factor with the aid of software Scarta 5.1.8. The equations for estimating erodibility factor values depend on the physical, chemical and biological properties of soils and are developed in order to minimize mistakes and get closer to an actual value of the factor K. The values found for the factor in erodibility Catorze River watershed range between 0.0611 and 0.1238 t ha-1.h.mm-1.ha.MJ-1, showing a high erodibility, especially for neossolos, soils that are less developed. These values for the K-factor shows the need for an adjustment in the use and conservation practices throughout the basin, using for this, the map of erodibility developed through GIS, where you can view the areas most susceptible to erosion and may apply control and prevention of erosion.Key Words: Erodibility, K factor, watershed

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