Polyoxyethylene alkyl ether carboxylic acids: An overview of a neglected class of surfactants with multiresponsive properties

Chiappisi, Leonardo

doi:10.1016/j.cis.2017.10.001

Cited by 46 publications

(47 citation statements)

References 162 publications

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“…Self-assembly in aqueous solutions. AECs with a lauric (C 12 ) or oleic (C 18:1 ) aliphatic chain and an average of 5 EO units form vesicles in a narrow pH range of 4-4.5, close to the pKa value of the fatty acid [27][28][29] the oppositely charged biopolymer chitosan ( Fig. 1b), welldefined onion-like vesicles are formed 24 , represented schematically in Fig.…”

Section: Resultsmentioning

confidence: 95%

One-step procedure for the preparation of functional polysaccharide/fatty acid multilayered coatings

Micciulla

Hayward

Gerelli³

et al. 2019

Commun Chem

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Soft, stratified, amphiphilic systems are recurrent motifs in nature, e.g., in myelin sheaths or thylakoid stacks, and synthetic analogues are increasingly being exploited in the areas of biocatalysis, biosensing, and drug delivery. The synthesis of such complex multilayered systems usually requires lengthy preparation protocols. Here, we demonstrate the formation of multilayered fatty acid/polysaccharide thin films prepared via a single step protocol, which exploits the spontaneous self-assembly of the components into vesicular systems in aqueous solution. The solutions are characterized by light and neutron scattering experiments and the thin films by neutron reflectometry, optical ellipsometry, atomic force microscopy, and x-ray diffraction. The thin films exhibit structural features with sub-10 nm dimensions, stemming from the ordered sequence of hydrophilic and hydrophobic layers and respond strongly to changes in ambient humidity. Using this approach, films with a total thickness varying from tens to hundreds of nanometers can be easily prepared.

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Section: Resultsmentioning

confidence: 95%

One-step procedure for the preparation of functional polysaccharide/fatty acid multilayered coatings

Micciulla

Hayward

Gerelli³

et al. 2019

Commun Chem

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“…Nevertheless, the use of biopolymers makes the study of polymer‐surfactant interactions more complicated because of a broader variation of the polymer chains (molecular weight, monomer sequence, branching, etc). However, there are some important studies, for example, the interesting hyaluronate‐cationic surfactant complexes, which are investigated by Thalberg and Lindman, or the carboxymethylcellulose‐cationic surfactant complexes investigated by Langevin et al Other important examples are the chitosan‐anionic carboxylate surfactants studied by Chiappisi and Gradzielski; a good overview of the neglected class of surfactants with multiresponsive properties is given in Chiappisi . Because of this complexity, studies about polysaccharide‐surfactant interactions are less often, and most of them focused on the bulk properties …”

Section: Introductionmentioning

confidence: 99%

Surfactant‐mediated formation of alginate layers at the water‐air interface

Degen

Paulus

Zwar

et al. 2019

Surface & Interface Analysis

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The self‐organization process of polysaccharide alginate with different cationic surfactants at the water‐air interface was investigated over a wide concentration regime. The changes of surface properties determined by surface tension measurements, surface rheology, and X‐ray reflectivity are correlated with changes of bulk properties measured by turbidity, light scattering, and zeta potential measurements. We demonstrate that the interactions between the alginate and cationic surfactants result in significant changes of bulk and interfacial properties. The results of surface shear experiments point to the existence of highly viscoelastic interfacial films. In combination with X‐ray reflectivity, we demonstrate that these rheological features are related to polymer‐surfactant associations at the interface. In the regime of high surfactant concentrations, we observed the existence of multilayer structures.

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“…[22][23][24] One of the next steps of our study is to confirm the results obtained with myristic acid by using other counter-ions as already described in the literature in the bulk and with other surfactants enable to form hydrogen bonding. [63][64][65] This study based on a fatty acid soap system provides new insights to understand the relationships existing between foam stability and self-assembly, which is of interest to all the scientists working on formulation, foam and self-assembly, and will stimulate further works on the subject. From an applied point of view, this study could help to improve the foaming formulations based on fatty acid soaps for various applications in detergency, cosmetics, etc.…”

Section: Resultsmentioning

confidence: 99%

Controlling Foam Stability with the Ratio of Myristic Acid to Choline Hydroxide

et al. 2018

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The interfacial and foam properties of a model system based on the mixture between myristic acid and choline hydroxide have been investigated as a function of the molar ratio ( R) between these two components and temperature. The aim of this study was to obtain insight on the links between the self-assemblies in bulk and in the foam liquid channels, the surfactant packing at the interface, and the resulting foam properties and stability. A multiscale approach was used combining small angle neutron scattering, specular neutron reflectivity, surface tension measurements, and photography. We highlighted three regimes of foam stability in this system by modifying R: high foam stability for R < 1, intermediate at R ∼ 1, and low for R > 1. The different regimes come from the pH variations in bulk linked to R. The pH plays a crucial role at the molecular scale by setting the ionization state of the myristic acid molecules adsorbed at the gas-liquid interface, which in turn controls both the properties of the monolayer and the stability of the films separating the bubbles. The main requirement to obtain stable foams is to set the pH close to the p K in order to have a mixture of protonated and ionized molecules giving rise to intermolecular hydrogen bonds. As a result, a dense monolayer is formed at the interface with a low surface tension. R also modifies the structure of self-assembly in bulk and therefore within the foam, but such a morphological change has only a minor effect on the foam stability. This study confirms that foam stability in surfactant systems having a carboxylic acid as polar headgroup is mainly linked to the ionization state of the molecules at the interface.

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Polyoxyethylene alkyl ether carboxylic acids: An overview of a neglected class of surfactants with multiresponsive properties

Cited by 46 publications

References 162 publications

One-step procedure for the preparation of functional polysaccharide/fatty acid multilayered coatings

One-step procedure for the preparation of functional polysaccharide/fatty acid multilayered coatings

Surfactant‐mediated formation of alginate layers at the water‐air interface

Controlling Foam Stability with the Ratio of Myristic Acid to Choline Hydroxide

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