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

Abstract

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.

Alginate and its application to tissue engineering

“…The porous scaffold of alginate gel can be fabricated by using a modern technique called as a surfactant foaming technique in which sodium lauryl sulfate was normally used as a surfactant. Because of the addition of bioactive glass as the inorganic component, the composite scaffolds obtained shows the property of osteoconductivity due to the formation of hydroxyapatites (Hap) [65].…”

Calcium bridging drives polysaccharide co-adsorption to a proxy sea surface microlayer

“…[59][60][61][62] Cooperative adsorption (coadsorption) to insoluble lipid monolayers has been indirectly observed for other saccharides and polysaccharides as well. 10,11,13,63 Electrostatic interactions between charged saccharides and either charged or zwitterionic lipid headgroups have been the predominant mechanism of co-adsorption proposed. For example, the cationic polysaccharide chitosan primarily interacts with negatively charged and zwitterionic phospholipids through electrostatic interactions between the chitosan ammonium and phospholipid phosphate moieties.…”

On the Interaction of Surfactants with Gallium‐Based Liquid Metals

“…The resulting surface tension ( γ ) is given by the following Equation: γ = γ 0 – π . At a specific concentration, the critical micelle concentration, surfactants aggregate into micelles and only a marginal change in surface adsorption of the surfactants and interfacial tension of the solution can be measured [18] . An idealized schematic of the adsorption and aggregation process of surfactants in water at the presence of a water/air interface is shown in Figure 2a.…”

“…At a specific concentration, the critical micelle concentration, surfactants aggregate into micelles and only a marginal change in surface adsorption of the surfactants and interfacial tension of the solution can be measured. [18] An idealized schematic of the adsorption and aggregation process of surfactants in water at the presence of a water/air interface is shown in Figure 2a. Interfacial tensionbased CMC measurement techniques are relying on the minute change in interfacial tension of the liquid once the CMC is reached.…”