Interfacial properties of dynamic association between chitin derivatives and surfactants

Babak, Valéry G.; Lukina, I. G.; Вихорева, Г. А.; Desbrières, Jacques; Rinaudo, M.

doi:10.1016/s0927-7757(98)00752-3

Cited by 75 publications

(64 citation statements)

References 16 publications

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“…The CAC was given at 10 mg/L and 50 mN/m for Methocel A15 (MW = 14 kDa) previously [14]. This value is higher than that obtained usually for a surfactant or for the surfactant-polyelectrolyte complex tested previously (values obtained between 35 and 45 mN/m) [6][7][8]. In different papers, it is suggested that the polymers adsorbed at the interfaces forming loops and trains on the basis of the hydrophobic group blocks the distribution, which is orientated toward the air at the water/air interface [12].…”

Section: Surface Activity Of Methylcellulosesmentioning

confidence: 87%

“…Amphiphilic polymers present some advantages compared with the small molecules of surfactants: the viscosity of the medium is increased, and the thickness of the adsorbed layer at the interface is larger (as well as the van der Waals interactions), depending on the polymer structure. The interfacial film at the air/water or oil/water interface when formed with polymers has greater mechanical properties, as shown for gum arabic, or Sonorean mesquite gum [5], or with alkyl chitosan [6][7][8].…”

Section: Introductionmentioning

confidence: 92%

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Interfacial Properties of Methylcelluloses: The Influence of Molar Mass

et al. 2014

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Abstract:The interfacial interactions of four methylcelluloses having the same average degree of substitution and distribution of methyl groups, but different molar masses, are studied at ambient temperature and at very low polymer concentrations. Firstly, the surface tension σ at the water/air interface is determined for the progressive addition of methylcellulose up to 100 mg/L; σ starts to decrease over 1 mg/L up to the critical aggregation concentration (CAC) at 10 mg/L. The curves describing the influence of polymer concentration on σ are independent of the molar mass at equilibrium. Secondly, the adsorption of methylcellulose on silica particles is estimated from ζ-potential measurements. The data are interpreted in terms of an increase of the adsorbed layer thickness at the interface when the molar mass of methylcellulose increases. It is concluded that methylcellulose is adsorbed, forming trains and loops at the interface based on the equilibrium between surface free energy and solvent quality.

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Section: Surface Activity Of Methylcellulosesmentioning

confidence: 87%

Section: Introductionmentioning

confidence: 92%

Interfacial Properties of Methylcelluloses: The Influence of Molar Mass

et al. 2014

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“…The surface (liquid-vapour, i.e., water-air) and/or interfacial (liquid-liquid, i.e., oil-water) tension of chitosan solutions of varying Mw, FA and concentration have been reported in some studies [60][61][62][63][64][65]. Payet et al studied the interfacial properties of chitosan, both at the air-water surface as well as at the oil-water interface.…”

Section: Surface Activity Of Chitosanmentioning

confidence: 99%

“…However, a slight decrease in interfacial tension was observed at the highest measured concentration. Based on these data, the authors concluded that chitosan does not exhibit surface active properties [64]. Mai-Ngam, on the other hand, reported on classic surfactant behavior and high surface activity of low-molecular weight chitosan hydrochloride (Mw 5000 g/mol, FA 0.035) based on surface tension measurements.…”

Section: Surface Activity Of Chitosanmentioning

confidence: 99%

Chitosan: Gels and Interfacial Properties

et al. 2015

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Abstract:Chitosan is a unique biopolymer in the respect that it is abundant, cationic, low-toxic, non-immunogenic and biodegradable. The relative occurrence of the two monomeric building units (N-acetyl-glucosamine and D-glucosamine) is crucial to whether chitosan is predominantly an ampholyte or predominantly a polyelectrolyte at acidic pH-values. The chemical composition is not only crucial to its surface activity properties, but also to whether and why chitosan can undergo a sol-gel transition. This review gives an overview of chitosan hydrogels and their biomedical applications, e.g., in tissue engineering and drug delivery, as well as the chitosan's surface activity and its role in emulsion formation, stabilization and destabilization. Previously unpublished original data where chitosan acts as an emulsifier and flocculant are presented and discussed, showing that highly-acetylated chitosans can act both as an emulsifier and as a flocculant.

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“…When chitosan is added to oppositely charged surfactant solutions, in most cases SDS, a lower surface tension with respect to the pure tenside solution is observed, with this effect being stronger for hydrophobically modied chitosan. 167,168 This effect is explained by the formation of highly surface active SPECs, which form already at very low surfactant concentrations, where SDS alone shows no decrease of surface tension.…”

mentioning

confidence: 99%

Complexes of oppositely charged polyelectrolytes and surfactants – recent developments in the field of biologically derived polyelectrolytes

2013

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We review the work done on complexes between biopolyelectrolytes such as ionically modified cellulose or chitosan and oppositely charged surfactants. Around equimolarity of the charges one typically observes precipitation but for other mixing ratios one may form long-time stable complexes, where structure and rheology depend on the mixing ratio, total concentration and the molecular constitution of the components. In addition, it may be the case that the structures are formed under non-equilibrium situations and therefore depend on the preparation path. The binding is shown to occur cooperatively and the micelles present often retain their shape irrespective of the complexation. However, the rather stiff biopolyelectrolytes may lead to an interconnection between different aggregates thereby forming a network with the corresponding rheological properties. In general, the structure and the properties of the aggregates are rather versatile and correspondingly one can create a wide range of different surfactant-biopolyelectrolyte systems by appropriately choosing the composition. This is very interesting as it allows for formulations with a large range of tuneable properties with ecologically friendly polyelectrolytes for many relevant applications.

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Interfacial properties of dynamic association between chitin derivatives and surfactants

Cited by 75 publications

References 16 publications

Interfacial Properties of Methylcelluloses: The Influence of Molar Mass

Interfacial Properties of Methylcelluloses: The Influence of Molar Mass

Chitosan: Gels and Interfacial Properties

Complexes of oppositely charged polyelectrolytes and surfactants – recent developments in the field of biologically derived polyelectrolytes

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