Influence of cationic surfactant on the surface charge of silica and on the stability of aqueous wetting films

1992 ◽  
Vol 152 (1) ◽  
pp. 170-182 ◽  
Author(s):  
Z.M Zorin ◽  
N.V Churaev ◽  
N.E Esipova ◽  
I.P Sergeeva ◽  
V.D Sobolev ◽  
...  
Keyword(s):  
Surface Charge ◽  
Cationic Surfactant ◽  
Wetting Films ◽  
The Stability

scholarly journals Effect of Modified Kiln Dust and a Cationic Surfactant on the Removal of Aromatic and Heavy Metal Compounds from Fuels

2019 ◽  
Vol 35 (5) ◽  
pp. 1508-1513
Author(s):  
Noura Yahya El Mehbad
Keyword(s):  
Heavy Metals ◽  
Cationic Surfactant ◽  
Oil Quality ◽  
Cement Kiln ◽  
Polar Molecules ◽  
Optimum Conditions ◽  
Metal Compounds ◽  
Before And After ◽  
The Stability ◽  
Kiln Dust

This paper aims to investigate removal of aromatic and heavy metals compounds from fuels using cement kiln dust, and a cationic surfactant. The effect of a cationic surfactant and the composition of kiln dust on the stability of fuel was studied. The optimum conditions of adsorption were investigated. The stability of fuels was improved after adsorption because of the absorption of heavy metals, which act as catalysts. The concentrations of kiln dust and additives are effective for the absorption of heteroatoms of polar and nonpolar molecules. The addition of different concentrations of the cationic surfactant to kiln dust enhances the removal of polar molecules in fuel. The relation between the efficiency of the cationic surfactant and the enhanced removal of polar molecules was established. This study suggests a new mechanism to remove polar molecules according to the structure of the additive. Several parameters that affect the performance of the removal process were investigated under all optimum conditions. A complete chemical analysis of the fuels before and after treatment was performed, and the stability of the fuel was evaluated at different conditions. The prepared additive could enhance the oil quality and is environmentally safe. The adsorption behaviour of kiln dust was investigated to find a new mechanism of its efficiency. The results confirm the role of the cationic surfactant in the purification of fuels and the effectiveness of kiln dust in improving the stability of fuels, which depend on the concentration of the cationic surfactant and the nature of the kiln dust.

Effect of liposome surface charge on the stability of technetium (99mTc) radiolabelled liposomes

1989 ◽  
Vol 6 (1) ◽  
pp. 105-113 ◽  
Author(s):  
W. G. Love ◽  
N. Amos ◽  
B. D. Williams ◽  
I. W. Kellaway
Keyword(s):  
Surface Charge ◽  
The Stability ◽  
Liposome Surface

When tethered chains meet free ones; the stability of polymer wetting films on polymer brushes

2003 ◽  
Vol 191 (1) ◽  
pp. 69-80 ◽  
Author(s):  
Joost H. Maas ◽  
Frans A.M. Leermakers ◽  
Gerard J. Fleer ◽  
Martinus A. Cohen Stuart
Keyword(s):  
Polymer Brushes ◽  
Wetting Films ◽  
The Stability ◽  
Tethered Chains

Investigation of the Stability of Dimeric Cationic Surfactant/DNA Complexes and Their Interaction with Model Membrane Systems

Langmuir ◽  
2002 ◽  
Vol 18 (26) ◽  
pp. 10340-10347 ◽  
Author(s):  
David Llères ◽  
Jean-Pierre Clamme ◽  
Emmanuel Dauty ◽  
Thomas Blessing ◽  
Guruswamy Krishnamoorthy ◽  
...  
Keyword(s):  
Cationic Surfactant ◽  
Model Membrane ◽  
Membrane Systems ◽  
Dna Complexes ◽  
The Stability

Electrohydrodynamic stability of a slightly viscous jet

1994 ◽  
Vol 274 ◽  
pp. 93-113 ◽  
Author(s):  
A. J. Mestel
Keyword(s):  
Surface Charge ◽  
Maximum Growth ◽  
Maximum Growth Rate ◽  
Small Fields ◽  
Weakly Conducting ◽  
Tangential Field ◽  
Tangential Surface ◽  
The Stability ◽  
Electric Effects ◽  
Phase Differences

Many electro-spraying devices raise to a high electric potential a pendant drop of weakly conducting fluid, which may adopt a conical shape from whose apex a thin, charged jet is emitted. Such a jet eventually breaks up into fine droplets, but often displays surprising longevity. This paper examines the stability of an incompressible cylindrical jet carrying surface charge in a tangential electric field, allowing for the finite rate of charge relaxation. The viscosity is assumed to be small so that the shear resulting from the tangential surface stress can be large, even for relatively small fields. This shear can suppress surface tension instabilities, but if too large, it excites electrical ones. For imperfect conductors, surface charge is redistributed by the rapid fluid reaction to variations in tangential stress as well as by conduction. Phase differences between the effects due to the tangential field and the surface charge lead to charge ‘over-relaxation’ instabilities, but the maximum growth rate can still be lower than in the absence of electric effects.

scholarly journals MWNTs or PEG as Stability Enhancers for DNA–Cationic Surfactant Gel Particles

2021 ◽  
Vol 22 (16) ◽  
pp. 8801
Author(s):  
Amalia Mezei ◽  
Ramon Pons
Keyword(s):  
Cationic Surfactant ◽  
Acid Media ◽  
X Ray Scattering ◽  
Gel Particles ◽  
Composite Gel ◽  
Multi Walled Carbon Nanotubes ◽  
Formation And Evolution ◽  
Poly Ethylene ◽  
The Stability ◽  
Walled Carbon Nanotubes

Cationic surfactants interact with DNA (Deoxyribonucleic acid), forming surfactant-DNA complexes that offer particularly efficient control for encapsulation and release of DNA from DNA gel particles. In the present work, DNA-based particles were prepared using CTAB (Cetyltrimethylammonium bromide) as the cationic surfactant and modified using two different additives: (Multi-Walled Carbon Nanotubes) MWNT or PEG (Poly Ethylene Glycol). The use of both additives to form composites increased the stability of the gel particles. The stability was monitored by the release of DNA and CTAB in different pH solutions. However, not much is known about the influence of pH on DNA–surfactant interaction and the release of DNA and surfactant from gel particles. It was observed that the solubilization of DNA occurs only in very acid media, while that of CTAB does not depend on pH and gets to a plateau after about 8 h. Within 2 h in contact with a pH = 2 solution, about 1% DNA and CTAB was released. Complete destruction for the gel particles was observed in pH = 2 solution after 17 days for PEG and 20 days for MWNT. The composite particles show a considerably enlarged sustained release span compared to the unmodified ones. The dehydration-rehydration studies show that the structure of the composite gel particles, as determined from SAXS (Small-Angle-X-Ray-Scattering) experiments, is similar to that of the unmodified ones. These studies will allow a better knowledge of these particles’ formation and evolution in view of possible applications in drug delivery and release.

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