scholarly journals Synthesis and assessment of new cationic gemini surfactants as inhibitors for carbon steel corrosion in oilfield water

RSC Advances ◽  
2017 ◽  
Vol 7 (75) ◽  
pp. 47335-47352 ◽  
Author(s):  
F. El-Taib Heakal ◽  
M. A. Deyab ◽  
M. M. Osman ◽  
M. I. Nessim ◽  
A. E. Elkholy
Keyword(s):  
Carbon Steel ◽  
Gemini Surfactant ◽  
Gemini Surfactants ◽  
Steel Corrosion ◽  
Surfactant Molecule ◽  
Cationic Gemini Surfactants ◽  
Oilfield Water

Stylized representation of Gemini surfactant molecule.

Surface Activity Research of Cationic Gemini Surfactants

2013 ◽  
Vol 690-693 ◽  
pp. 2076-2080
Author(s):  
Zhen Zhong Fan ◽  
Lan Lan Li ◽  
Li Feng Zhang ◽  
Qing Wang Liu
Keyword(s):  
Surface Tension ◽  
Critical Micelle Concentration ◽  
Surface Activity ◽  
Surfactant Concentration ◽  
Gemini Surfactant ◽  
Gemini Surfactants ◽  
Ph Value ◽  
Inorganic Salts ◽  
Cationic Gemini Surfactant ◽  
Cationic Gemini Surfactants

Cationic Gemini surfactant concentration, the inorganic salts added and the pH value of surface tension obtained cationic gemini surfactant critical micelle concentration is 0.4mmol / L;by adding three kinds of inorganic salts NaCl, MgCl2, and Na2SO4 ,which Na2SO4 has the greatest impact on surface tension, followed by MgCl2.The surface minimum tension of the pH ranged from 9 to 11 , indicating that the surface activity of cationic gemini surfactants achieved the highest.

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 Development of Lyophilized Gemini Surfactant-Based Gene Delivery Systems: Influence of Lyophilization on the Structure, Activity and Stability of the Lipoplexes

2012 ◽  
Vol 15 (4) ◽  
pp. 548 ◽  
Author(s):  
Waleed Mohammed-Saeid ◽  
Deborah Michel ◽  
Anas El-Aneed ◽  
Ronald E Verrall ◽  
Nicholas H Low ◽  
...  
Keyword(s):  
Conformational Changes ◽  
Gemini Surfactant ◽  
Gemini Surfactants ◽  
Transfection Efficiency ◽  
Gene Transfection ◽  
Physiochemical Properties ◽  
Cationic Gemini Surfactants ◽  
The Stability ◽  
In Vitro Transfection

Purpose. Cationic gemini surfactants have been studied as non-viral vectors for gene therapy. Clinical applications of cationic lipid/DNA lipoplexes are restricted by their instability in aqueous formulations. In this work, we investigated the influence of lyophilization on the essential physiochemical properties and in vitro transfection of gemini surfactant-lipoplexes. Additionally, we evaluated the feasibility of lyophilization as a technique for preparing lipoplexes with long term stability. Methods. A gemini surfactant [12-7NH-12] and plasmid DNA encoding for interferon-γ were used to prepare gemini surfactant/pDNA [P/G] lipoplexes. Helper lipid DOPE [L] was incorporated in all formulation producing a [P/G/L] system. Sucrose and trehalose were utilized as stabilizing agents. To evaluate the ability of lyophilization to improve the stability of gemini surfactant-based lipoplexes, four lyophilized formulations were stored at 25˚C for three months. The formulations were analyzed at different time-points for physiochemical properties and in vitro transfection. Results. The results showed that both sucrose and trehalose provided anticipated stabilizing effect. The transfection efficiency of the lipoplexes increased 2-3 fold compared to fresh formulations upon lyophilization. This effect can be attributed to the improvement of DNA compaction and changes in the lipoplex morphology due to the lyophilization/rehydration cycles. The physiochemical properties of the lyophilized formulations were maintained throughout the stability study. All lyophilized formulations showed a significant loss of gene transfection activity after three months of storage. Nevertheless, no significant losses of transfection efficiency were observed for three formulations after two months storage at 25 ˚C. Conclusion. Lyophilization significantly improved the physical stability of gemini surfactant-based lipoplexes compared to liquid formulations. As well, lyophilization improved the transfection efficiency of the lipoplexes. The loss of transfection activity upon storage is most probably due to the conformational changes in the supramolecular structure of the lipoplexes as a function of time and temperature rather than to DNA degradation. This article is open to POST-PUBLICATION REVIEW. Registered readers (see “For Readers”) may comment by clicking on ABSTRACT on the issue’s contents page.

scholarly journals Cationic Gemini Surfactants with a Bipyridyl Spacer as Corrosion Inhibitors for Carbon Steel

ACS Omega ◽  
2018 ◽  
Vol 3 (12) ◽  
pp. 18990-18999 ◽  
Author(s):  
Liwei Feng ◽  
Chengxian Yin ◽  
Huali Zhang ◽  
Yufei Li ◽  
Xuehua Song ◽  
...  
Keyword(s):  
Carbon Steel ◽  
Corrosion Inhibitors ◽  
Gemini Surfactants ◽  
Cationic Gemini Surfactants

scholarly journals Controllable enzymatic superactivity of α-chymotrypsin activated by the electrostatic interaction with cationic gemini surfactants

RSC Advances ◽  
2021 ◽  
Vol 11 (13) ◽  
pp. 7294-7304
Author(s):  
Zheng Yue ◽  
Meihuan Yao ◽  
Guangyue Bai ◽  
Jiuxia Wang ◽  
Kelei Zhuo ◽  
...  
Keyword(s):  
Charge Density ◽  
Electrostatic Interaction ◽  
Gemini Surfactant ◽  
Gemini Surfactants ◽  
Cationic Gemini Surfactant ◽  
Cationic Gemini Surfactants ◽  
Novel Strategy

This study proposes a novel strategy to enhance enzymatic superactivity of α-CT by controlling the charge density of cationic gemini surfactant.

Surface Activity Research of Cationic Gemini Surfactants

2013 ◽  
Vol 652-654 ◽  
pp. 1450-1454
Author(s):  
Zhen Zhong Fan ◽  
Lan Lan Li ◽  
Li Feng Zhang ◽  
Qing Wang Liu
Keyword(s):  
Surface Tension ◽  
Critical Micelle Concentration ◽  
Surface Activity ◽  
Surfactant Concentration ◽  
Gemini Surfactant ◽  
Gemini Surfactants ◽  
Ph Value ◽  
Inorganic Salts ◽  
Cationic Gemini Surfactant ◽  
Cationic Gemini Surfactants

Cationic Gemini surfactant concentration, the inorganic salts added and the pH value of surface tension obtained cationic gemini surfactant critical micelle concentration is 0.4mmol / L;by adding three kinds of inorganic salts NaCl, MgCl2, and Na2SO4 ,which Na2SO4 has the greatest impact on surface tension, followed by MgCl2.The surface minimum tension of the pH ranged from 9 to 11 , indicating that the surface activity of cationic gemini surfactants achieved the highest.

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