Surface tension and dilation rheology of DNA solutions in mixtures with azobenzene-containing cationic surfactant

2016 ◽  
Vol 505 ◽  
pp. 186-192 ◽  
Author(s):  
N. Moradi ◽  
Yuriy Zakrevskyy ◽  
A. Javadi ◽  
E.V. Aksenenko ◽  
V.B. Fainerman ◽  
...  
Keyword(s):  
Surface Tension ◽  
Cationic Surfactant ◽  
Dna Solutions

Preparation of a new lignin-based anionic/cationic surfactant and its solution behaviour

RSC Advances ◽  
2015 ◽  
Vol 5 (4) ◽  
pp. 2441-2448 ◽  
Author(s):  
Mingsong Zhou ◽  
Wenli Wang ◽  
Dongjie Yang ◽  
Xueqing Qiu
Keyword(s):  
Surface Tension ◽  
Cationic Surfactant ◽  
Anionic Surfactant ◽  
Water Interface ◽  
Air Water Interface ◽  
Solution Behaviour

The lignin-based cationic/anionic surfactant CA-SLs have a stronger ability to lower the surface tension at the air/water interface compared with SL–PEG, but a weaker one than CTAB.

Preparation of Novel Gemini Quaternary Ammonium Salt Cationic Surfactant

2012 ◽  
Vol 174-177 ◽  
pp. 1433-1436 ◽  
Author(s):  
Zong Cheng Miao ◽  
Fang Wang ◽  
Deng Deng ◽  
Yong Ming Zhang ◽  
Xiao Ping Huo ◽  
...  
Keyword(s):  
Surface Tension ◽  
Ammonium Chloride ◽  
Cationic Surfactant ◽  
Ammonium Salt ◽  
Quaternary Ammonium ◽  
Quaternary Ammonium Salt ◽  
Foam Stability ◽  
High Surface ◽  
Amine Hydrochloride ◽  
Gemini Cationic Surfactant

In order to obtain some novel cationic surfactants with high surface activity, n-octadecyldimethylamine and epichlorohydrin were used to synthesize 2-hydroxy-1, 3-dis (chloride octadecyl dimethyl ammonium) propane, which was a kind of gemini quaternary ammonium salt. N-octadecyldimethylamine and epichlorohydrin were used to prepare active epoxy intermediate glycidyloctadecyldimethyl ammonium chlorided, and then glycidyloctadecyldimethyl ammonium chlorided was reacted with octadecyldimethyl amine hydrochloride to synthesize the gemini cationic surfactant. FTIR and 1H NMR were used to represent structure of the gemini cationic surfactant. The interface characteristics were studied in detail. The critical micellar concentration (CMC) was determined by surface tension test to obtain the values of CMC and surface tension at CMC. The foam ability and foam stability of the gemini cationic surfactant were also discussed through contrast octadecyltrimethyl ammonium chloride and cetyltrimethyl ammonium chloride.

Vesicle−Micelle Equilibrium of Anionic and Cationic Surfactant Mixture Studied by Surface Tension

Langmuir ◽  
1999 ◽  
Vol 15 (6) ◽  
pp. 2029-2036 ◽  
Author(s):  
Masumi Villeneuve ◽  
Shoji Kaneshina ◽  
Toyoko Imae ◽  
Makoto Aratono
Keyword(s):  
Surface Tension ◽  
Cationic Surfactant ◽  
Surfactant Mixture

Effect of Sodium Halide on Dynamic Surface Tension of a Cationic Surfactant

2005 ◽  
Vol 23 (8) ◽  
pp. 957-962 ◽  
Author(s):  
Lü Feng-Feng ◽  
Zheng Li-Qiang ◽  
Gao Yan-An ◽  
Li Gan-Zuo ◽  
Tong Zhen-He
Keyword(s):  
Surface Tension ◽  
Cationic Surfactant ◽  
Dynamic Surface Tension ◽  
Dynamic Surface

Implications of Shale Oil Compositions on Surfactant Efficacy for Wettability Alteration

2015 ◽  
Author(s):  
Lijie Feng ◽  
Xu Liang
Keyword(s):  
Surface Tension ◽  
Cationic Surfactant ◽  
Oil Recovery ◽  
Anionic Surfactant ◽  
Ion Pairs ◽  
Wettability Alteration ◽  
Rock Surface ◽  
Base Number ◽  
Shale Oil ◽  
Interfacial Surface

Abstract Surfactant selection is important for oil recovery in a hydraulically fractured reservoir. Two primary mechanisms, ion-pair coupling (cleaning) between surfactant and hydrocarbon and surfactant adsorption onto the rock surface (coating), were previously suggested to explain how surfactants can alter rock wettability, thus improving oil production. Because of the electrostatic interaction, acidic compounds in the oil tend to be adsorbed onto rock surface that is positively charged; whereas basic compounds are preferentially attracted to rock surface that is negatively charged. It has been discussed in previous literature that for wettability alteration for conventional formation rocks, the cleaning mechanism could be more efficient by inducing ion pairs between surfactants and oil compounds that have opposite charges, rather than the coating mechanism that mainly relies on how well surfactant covers the rock surface. In this research, 90 shale oils from various liquids shale plays, such as the Eagle Ford and the Wolfcamp, were tested for total acid number (TAN) and total base number (TBN). Cationic and anionic surfactants with low interfacial surface tension, along with Berea sandstone and Indiana limestone, were used to investigate the extent that TAN and TBN can be used as criteria to select surfactants. Oil recovery, imbibition, interfacial surface tension, and emulsion tendency were conducted to examine whether the cleaning mechanism holds true for shale oil saturated formation rocks. The results demonstrated that for carbonates with shale oil having a higher TAN, a cationic surfactant provided the potential to sweep more oil than an anionic surfactant. On the other hand, for sandstone with shale oil having a higher TBN, an anionic surfactant performed better than a cationic surfactant. Those observations appear to be consistent with the proposed cleaning mechanism and resonate with production data for thousands of wells from some major liquids-rich shale plays.

On the measurement of the surface tension of DNA solutions

1984 ◽  
Vol 102 (1) ◽  
pp. 295-297 ◽  
Author(s):  
Enrica Ricci ◽  
Roberto Sangiorgi ◽  
Alberto Passerone
Keyword(s):  
Surface Tension ◽  
Dna Solutions

Preparation of Novel Diester Gemini Quaternary Ammonium Salt Cationic Surfactant

2014 ◽  
Vol 1004-1005 ◽  
pp. 699-702
Author(s):  
Zong Cheng Miao ◽  
Jian Wei Ren
Keyword(s):  
Surface Tension ◽  
Ammonium Chloride ◽  
Cationic Surfactant ◽  
Foam Stability ◽  
Raw Materials ◽  
High Surface ◽  
Critical Micellar Concentration ◽  
Interface Characteristics ◽  
Cetyltrimethyl Ammonium ◽  
Gemini Cationic Surfactant

In order to obtain a biodegradable gemini cationic surfactant with high surface activity, N, N-dodecyldimethyl amine, epichlorohydrin and adipic acid were used as raw materials to synthesize the surfactant, and Fourier transform infrared spectroscopy was used to characterize the groups. And then the interface characteristics of the surfactant were studied in detail. The critical micellar concentration (CMC) was determined by surface tension test to obtain the values of CMC and surface tension at CMC. The foam ability and foam stability of the gemini cationic surfactant were also discussed through contrast octadecyltrimethyl ammonium chloride and cetyltrimethyl ammonium chloride.

scholarly journals Interaction of Natural Dye (Allium cepa) with Ionic Surfactants

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Shalini Chandravanshi ◽  
Santosh K. Upadhyay
Keyword(s):  
Surface Tension ◽  
Complex Formation ◽  
Cationic Surfactant ◽  
Allium Cepa ◽  
Cetyltrimethylammonium Bromide ◽  
Interaction Process ◽  
Natural Dye ◽  
Ionic Surfactants ◽  
Surface Parameters ◽  
Soxhlet Apparatus

Allium cepais a natural dye that has been extracted from onion skin with the help of soxhlet apparatus. The pigment in the dye pelargonidin was found to be 2.25%. The interaction of the dye with ionic surfactants, namely, cationic surfactant (cetyltrimethylammonium bromide) and anionic (sodium lauryl sulphate) has been studied by spectrophotometrically, conductivity, and surface tension measurements. The thermodynamic and surface parameters have been evaluated for the interaction process. The results indicate{surfactant-dye}complex formation and domination of adsorption in comparison to micellization.

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