Effects of Ionic Strength on the Surface Tension and Nonequilibrium Interfacial Characteristics of Poly(sodium styrenesulfonate)/Dodecyltrimethylammonium Bromide Mixtures

Langmuir ◽  
2014 ◽  
Vol 30 (17) ◽  
pp. 4970-4979 ◽  
Author(s):  
Ágnes Ábrahám ◽  
Attila Kardos ◽  
Amália Mezei ◽  
Richard A. Campbell ◽  
Imre Varga
Keyword(s):  
Surface Tension ◽  
Ionic Strength ◽  
Dodecyltrimethylammonium Bromide ◽  
Interfacial Characteristics ◽  
Sodium Styrenesulfonate

scholarly journals Self-assembly of sodium dodecylsulfate and dodecyltrimethylammonium bromide mixed surfactants with dyes in aqueous mixtures

2019 ◽  
Vol 6 (3) ◽  
pp. 181979 ◽  
Author(s):  
K. M. Sachin ◽  
Sameer A. Karpe ◽  
Man Singh ◽  
Ajaya Bhattarai
Keyword(s):  
Surface Tension ◽  
Self Assembly ◽  
Sodium Dodecylsulfate ◽  
Critical Micellar Concentration ◽  
Aqueous System ◽  
Mixed Surfactants ◽  
Dodecyltrimethylammonium Bromide ◽  
Aqueous Mixtures ◽  
Krafft Temperature ◽  
Vis Spectroscopy

The micellar property of mixed surfactant systems, cationic (dodecyltrimethylammonium bromide, DTAB) and anionic (sodium dodecylsulfate, SDS) surfactants with variable molar ratios in aqueous system has been reported by using surface tension and conductivity measurements at T = 293.15, 298.15 and 303.15 K. DTAB concentrations are varied from 1.0 × 10 −4 to 3 × 10 −4 mol l −1 in 1.0 × 10 −2 mol l −1 SDS solution while the SDS concentration is varied from 1.0 × 10 −3 to 1.5 × 10 −2 mol l −1 in approximately 5.0 × 10 −3 mol l −1 DTAB, so that such concentrations of DTAB-SDS (DTAB-rich) and SDS-DTAB (SDS-rich) solutions were chosen 3 : 1 ratio. The critical micellar concentration, as well as surface and thermodynamic properties for DTAB-rich and SDS-rich solutions, were evaluated by the surface tension ( γ ) and conductivity ( κ ) methods. The pseudo phase separation model was coupled with the dissociated Margules model for synergism. The Krafft temperature behaviour and optical analysis of mixed surfactants are studied using conductivity and UV–Vis spectroscopy, respectively. The dispersibility and stability of DTAB-rich and SDS-rich solutions with and without dyes (2.5 × 10 −5 mol l −1 of methyl orange and methylene blue) are carried out by using UV–Vis spectroscopy and dynamic light scattering.

Colloid transport with wetting fronts: Interactive effects of solution surface tension and ionic strength

2010 ◽  
Vol 44 (4) ◽  
pp. 1270-1278 ◽  
Author(s):  
Jie Zhuang ◽  
Nadine Goeppert ◽  
Ching Tu ◽  
John McCarthy ◽  
Edmund Perfect ◽  
...  
Keyword(s):  
Surface Tension ◽  
Ionic Strength ◽  
Interactive Effects ◽  
Colloid Transport ◽  
Solution Surface

Surface properties of the bovine casein components: relationships between structure and foaming properties

1989 ◽  
Vol 56 (3) ◽  
pp. 495-502 ◽  
Author(s):  
Denis Lorient ◽  
Brigitte Closs ◽  
Jean Luc Courthaudon
Keyword(s):  
Surface Tension ◽  
Ionic Strength ◽  
Foam Stability ◽  
Covalent Binding ◽  
High Surface ◽  
Surface Hydrophobicity ◽  
Foaming Properties ◽  
Foam Formation ◽  
Foaming Capacity ◽  
Low Ionic Strength

SummaryIn order to optimize the use of caseins as surfactants, the surface tension, foaming capacity and stability were measured as a function of pH, ionic strength, protein concentration and polarity (modified by covalent binding of carbohydrates). We found that the caseins differ in their behaviour at the air/water interface with β-casein showing the greatest ability to decrease surface tension and to produce foams, due probably to its amphipathic structure. In experiments carried out at pH values close to pI, with low ionic strength and constant solubility (optimal conditions for foam formation), we observed a high surface hydrophobicity, a good accessibility and flexibility of peptidic side chains (evaluated by proteolysis), and a high foaming capacity parallelled by increased surface pressure. Foam stability of caseins was low compared to those of globular proteins such as β lactoglobulin.

Influence of Ionic Strength on Surface Tension of Cetyltrimethylammonium Bromide

Langmuir ◽  
1999 ◽  
Vol 15 (24) ◽  
pp. 8383-8387 ◽  
Author(s):  
Z. Adamczyk ◽  
G. Para ◽  
P. Warszyński
Keyword(s):  
Surface Tension ◽  
Ionic Strength ◽  
Cetyltrimethylammonium Bromide

The effect of ionic strength on surfactant-induced unsaturated flow

2011 ◽  
Vol 48 (4) ◽  
pp. 644-654 ◽  
Author(s):  
Rashid Bashir ◽  
James E. Smith ◽  
Dieter E. Stolle
Keyword(s):  
Surface Tension ◽  
Ionic Strength ◽  
Soil Water ◽  
Unsaturated Flow ◽  
Water Solution ◽  
Pure Water ◽  
Soil Column ◽  
Time Domain Reflectometry ◽  
Induced Flow ◽  
The Impact

The effect of ionic strength of soil water on surfactant-induced unsaturated flow is investigated for the anionic surfactant DOWFAX 8390. Instrumented infiltration experiments were performed to study the impact of surfactant and ionic strength of the soil-water solution on unsaturated flow. A solution having a measured surface tension of 68 mN/m was prepared with 0.014% w/w DOWFAX using distilled water and applied to the soil column instrumented with time domain reflectometry probes and pressure transducer equipped tensiometers. Results of the experiment were compared with those of pure water to investigate surfactant-induced flow and the corresponding influence of the ionic strength of soil water. The DOWFAX solution behaved like a solution having a surface tension of 49 mN/m, which was directly attributed to the interaction between the surfactant and soil water. Soil-moisture characteristic curves for soil wetted with water and DOWFAX were also measured, and a scaling relationship as a function of reduced surface tension is proposed.

Controlling nanoparticle template morphology: effect of solvent chemistry

2002 ◽  
Vol 752 ◽  
Author(s):  
Maria M. Cortalezzi ◽  
Vicki Colvin ◽  
Mark R. Wiesner
Keyword(s):  
Surface Tension ◽  
Ionic Strength ◽  
Interaction Energy ◽  
Porous Solids ◽  
Porous Membranes ◽  
Effect Of Solvent ◽  
Capillary Interactions ◽  
Morphology Effect ◽  
Solvent Chemistry ◽  
Parameters Of Interest

ABSTRACTPorous solids were obtained from self-assembled deposits of silica nanoparticles used as templates to form 3-D porous membranes. The effect of the solvent chemistry on the morphology of the deposits was investigated. The parameters of interest are surface tension and ionic strength of the solvent, due to electrostatic and capillary interactions. Deposits of nanoparticles of different sizes were obtained for a variety of conditions. The deposits were imaged using SEM and showed distinctive structures for each of the solvent chemistries. The phenomenon is consistent with the DVLO theory and calculations of capillary interaction energy.

Surface tension studies of lauryl sulfobetaine - β-cyclodextrin and dodecyltrimethylammonium bromide - β-cyclodextrin inclusion complexes in aqueous solution

1999 ◽  
Vol 77 (7) ◽  
pp. 1208-1213 ◽  
Author(s):  
S Göktürk ◽  
M Mahramanlloglu ◽  
M Tunçay
Keyword(s):  
Surface Tension ◽  
Complex Formation ◽  
Inorganic Compounds ◽  
Binding Constants ◽  
Polar Group ◽  
Dodecyltrimethylammonium Bromide ◽  
Adsorption Model ◽  
Langmuir Adsorption ◽  
Polar Groups ◽  
Concentration Curves

β-Cyclodextrin (β-CD) is a cyclic oligosaccaride with an apolar cavity that shows a certain degree of selectivity in binding organic and inorganic compounds. Lauryl sulfobetaine (LSB) and dodecyltrimethylammonium bromide (DTAB), having the same hydrophobic and different polar groups are used in order to compare the influence of the polar group on complex formation with β-CD. The surface tension increased as β-CD is added to premicellar region of amphoteric (LSB) and cationic surfactant (DTAB) solutions. The relation between the surface tension and surfactant concentration can be expressed by the Szyszkowski equation, which combines the Langmuir adsorption model and the Gibbs equation. Binding constants were determined from the effect of added β-CD on the surface tension vs. concentration curves for LSB and DTAB aqueous solutions.Key words: β-cyclodextrin, surfactant, surface tension method, complex formation, binding constant.

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