Foaming binary solution mixtures of low molecular surfactant and polyelectrolyte

Aidarova, Saule; Мusabekov, Kuanyshbek; Ospanova, Zhanar; Güden, Mustafa

doi:10.1007/s10853-006-7573-9

Cited by 9 publications

(8 citation statements)

References 3 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, clear synergistic effects on surface tension lowering and/or foam capacity were observed independent of the nature of surfactants and polyelectrolytes (anionic, cationic, nonionic). 17 , 25 , 26 Consequently, the stability of macroscopic foams from mixtures of polyelectrolytes and surfactants can be enhanced not only by charge screening but also by other effects that demand further studies.…”

Section: Introductionmentioning

confidence: 99%

Structure of Polystyrenesulfonate/Surfactant Mixtures at Air–Water Interfaces and Their Role as Building Blocks for Macroscopic Foam

Schulze-Zachau

Braunschweig

2017

Langmuir

View full text Add to dashboard Cite

Air/water interfaces were modified by oppositely charged poly(sodium 4-styrenesulfonate) (NaPSS) and hexadecyltrimethylammonium bromide (CTAB) polyelectrolyte/surfactant mixtures and were studied on a molecular level with vibrational sum-frequency generation (SFG), tensiometry, surface dilatational rheology and ellipsometry. In order to deduce structure property relations, our results on the interfacial molecular structure and lateral interactions of PSS–/CTA+ complexes were compared to the stability and structure of macroscopic foam as well as to bulk properties. For that, the CTAB concentration was fixed to 0.1 mM, while the NaPSS concentration was varied. At NaPSS monomer concentrations <0.1 mM, PSS–/CTA+ complexes start to replace free CTA+ surfactants at the interface and thus reduce the interfacial electric field in the process. This causes the O−H bands from interfacial H2O molecules in our SFG spectra to decrease substantially, which reach a local minimum in intensity close to equimolar concentrations. Once electrostatic repulsion is fully screened at the interface, hydrophobic PSS–/CTA+ complexes dominate and tend to aggregate at the interface and in the bulk solution. As a consequence, adsorbate layers with the highest film thickness, surface pressure, and dilatational elasticity are formed. These surface layers provide much higher stabilities and foamabilities of polyhedral macroscopic foams. Mixtures around this concentration show precipitation after a few days, while their surfaces to air are in a local equilibrium state. Concentrations >0.1 mM result in a significant decrease in surface pressure and a complete loss in foamability. However, SFG and surface dilatational rheology provide strong evidence for the existence of PSS–/CTA+ complexes at the interface. At polyelectrolyte concentrations >10 mM, air–water interfaces are dominated by an excess of free PSS– polyelectrolytes and small amounts of PSS–/CTA+ complexes which, however, provide higher foam stabilities compared to CTAB free foams. The foam structure undergoes a transition from wet to polyhedral foams during the collapse.

show abstract

Section: Introductionmentioning

confidence: 99%

Structure of Polystyrenesulfonate/Surfactant Mixtures at Air–Water Interfaces and Their Role as Building Blocks for Macroscopic Foam

Schulze-Zachau

Braunschweig

2017

Langmuir

View full text Add to dashboard Cite

show abstract

“…In particular, this is clearly seen in metastable micrometer and sub-micrometer heterogenous disperse systems, such as foams [26,[31][32][33], emulsions [22,23,[33][34][35], and dispersions [36][37][38]. Among them, emulsions stabilized by PS mixtures for microencapsulation of a variety of volatile components, such as perfumes or flavors, in a wide range of applications in home and personal care products, cosmetics, foods, and pharmaceuticals, are a potentially promising route [35].…”

Section: Introductionmentioning

confidence: 99%

The Use of Polymer and Surfactants for the Microencapsulation and Emulsion Stabilization

Sharipova¹,

Aidarova²,

Mutaliyeva³

et al. 2017

Colloids and Interfaces

View full text Add to dashboard Cite

Polymer/surfactant mixtures have a wide range of industrial and technological applications, one of them being the use in microencapsulation and emulsion stabilization processes. These mixtures are able to form adsorption layers at the surface of oil droplets and so affect the emulsion stability, which depends on the polyelectrolyte/surfactant nature, concentrations ratio, method of the emulsification, etc. Polyelectrolytes alone show low surface activity in contrast to surfactants, which adsorb at the water/oil interface, making the droplets charged, but they are insufficient to stabilize emulsions. When an oppositely-charged polymer is added to the surfactant solution, a steric barrier is formed, which prevents coalescence and enhances the stability. The present review is devoted to the recent studies of the use of polymer/surfactant mixtures for the encapsulation of active ingredients and stabilization of single and double emulsions. Active ingredients are added to the oil phase prior to emulsification so that any subsequent dissolution of the core, like in other encapsulation protocols, can be omitted. By measuring the interfacial tension and dilational rheology it is possible to find optimum conditions for the emulsion formation and hence for encapsulation. Therefore, such systems have become a prominent approach for the encapsulation of active ingredients.

show abstract

“…Addition of the polymer can enhance the viscosity of surfactant solution due to the viscosity behaviors of the polymer solution [31,40]. Probably, the combined adsorption of polymer and surfactant occurring at the interface could cause a more tightly packed adsorbed surface layer and hence strengthen the liquid foam film [19]. Thus, the stability of foams is improved greatly by adding the polymer into the surfactant solution.…”

Section: Resultsmentioning

confidence: 99%

“…In previous papers, the aggregation behaviors of C n mimBr with existence of different additives have been investigated by various methods [3][4][5][6][7][8][9][10][11][12][13][14], but the related investigation of foam performance of the ILs solutions is very limited. In actual applications of ILs, their foam properties in aqueous solutions and other mixed systems are of great importance [15][16][17][18][19][20]. Because the unique properties of foams associated with cellular structures and their lightness have made them very attractive materials to be used in many different and diverse applications including washing and cleaning, firefighting, ore enrichment by floatation, foam fractionation, oil and gas industry, dust-depression, etc.…”

Section: Introductionmentioning

confidence: 99%

“…The foaming ability and foam stability are therefore key parameters for manufacturing foams with the desired properties [25][26][27]. Such macromolecular substances as water-soluble polymers are used as foam stabilizing elements [19,28]; however, the corresponding mechanisms have not been completely clarified. This presentation is a further investigation into understanding the mechanisms through the foam performance of C 14 mimBr aqueous solutions in the presence of PEG or PVA.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Effects of Inorganic Salts and Polymers on the Foam Performance of 1‐Tetradecyl‐3‐methylimidazolium Bromide Aqueous Solution

Zhang¹,

Wei²,

Liu³

et al. 2012

J Surfact & Detergents

View full text Add to dashboard Cite

The foaming performance of 1‐tetradecyl‐3‐methylimidazolium bromide (C14mimBr) aqueous solution, in the presence of polymers (PEG or PVA) or inorganic salts (NaBr, MgCl2, NaNO3, Na2SO4 or Na3PO4), was investigated at 25.0 °C by using the self‐made apparatus and the conductivity method. The experimental results show that the foaming ability and foam stability of the ternary aqueous systems of C14mimBr coexisting with PEG or PVA are stronger than those of the C14mimBr solutions in the absence of a polymer, and both the efficiency of foaming ability and foam stability of the surfactant solutions are evidently enhanced with an increase in polymer concentration. However, the addition of inorganic salts can decrease the foaming ability and foam stability of C14mimBr solution. Especially, the inorganic salts, with high valence state of the anion (SO42− and PO43−), are good antifoam agents which can remove and inhibit foam quickly. For the aqueous solution of the surfactant, the effect of temperature on foaming properties was also examined. The results show that both the foaming ability and stability of the foams of the surfactant solutions decrease with an increase in the temperature within the range from 25.0 to 45.0 °C.

show abstract

Foaming binary solution mixtures of low molecular surfactant and polyelectrolyte

Cited by 9 publications

References 3 publications

Structure of Polystyrenesulfonate/Surfactant Mixtures at Air–Water Interfaces and Their Role as Building Blocks for Macroscopic Foam

Structure of Polystyrenesulfonate/Surfactant Mixtures at Air–Water Interfaces and Their Role as Building Blocks for Macroscopic Foam

The Use of Polymer and Surfactants for the Microencapsulation and Emulsion Stabilization

Effects of Inorganic Salts and Polymers on the Foam Performance of 1‐Tetradecyl‐3‐methylimidazolium Bromide Aqueous Solution

Contact Info

Product

Resources

About