J. Penfold
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View article: Biosurfactant/surfactant mixing properties at the air–water interface: comparing rhamnolipids and sophorolipids mixed with the anionic surfactant sodium dodecyl benzene sulfonate
Biosurfactant/surfactant mixing properties at the air–water interface: comparing rhamnolipids and sophorolipids mixed with the anionic surfactant sodium dodecyl benzene sulfonate Open
There is an increasing interest in the use of biosurfactants in the development of more biocompatible and biosustainable surfactant-based products.
View article: The Gibbs and Butler Equations and the Surface Activity of Dilute Aqueous Solutions of Strong and Weak Linear Polyelectrolyte–Surfactant Mixtures: The Roles of Surface Composition and Polydispersity
The Gibbs and Butler Equations and the Surface Activity of Dilute Aqueous Solutions of Strong and Weak Linear Polyelectrolyte–Surfactant Mixtures: The Roles of Surface Composition and Polydispersity Open
In a previous paper, we applied a combination of direct measurements of both surface tension and surface excess in conjunction with the Gibbs equation to explain features of the adsorption and surface tension of mixtures of surfactants and…
View article: Manipulating the hydrophilic / hydrophobic balance in novel cationic surfactants by ethoxylation: The impact on adsorption and self-assembly
Manipulating the hydrophilic / hydrophobic balance in novel cationic surfactants by ethoxylation: The impact on adsorption and self-assembly Open
The trends in the adsorption at the air-water interface and the self-assembly in aqueous solution demonstrate how the hydrophilic / hydrophobic balance can be adjusted by varying the degree of ethoxylation and the alkyl chain length, and i…
View article: The adsorption and self-assembly of biosurfactants and biosurfactant / surfactant mixtures using neutron scattering techniques
The adsorption and self-assembly of biosurfactants and biosurfactant / surfactant mixtures using neutron scattering techniques Open
The neutron and X-ray scattering techniques of small-angle scattering and reflectivity are important tools for the characterisation of the key properties of surfactants, their adsorption at interfaces, and their self-assembly in solution. …
View article: The adsorption and self-assembly of surfactant mixtures: How the detailed evaluation of adsorption properties provides access to the bulk behaviour
The adsorption and self-assembly of surfactant mixtures: How the detailed evaluation of adsorption properties provides access to the bulk behaviour Open
The nature of surfactant mixing at interfaces and in bulk solution is key to understanding and optimising the diverse industrial, technological, biological and domestic applications of surfactants. The use of neutron reflectivity, NR, and …
View article: Neutron reflection and the thermodynamics of the air–water interface
Neutron reflection and the thermodynamics of the air–water interface Open
Neutron reflection measures the surface composition of mixtures and quantifies their interactions. The illustration shows the behaviour of an ionic-zwitterion surfactant mixture and a possible configuration of the molecules at the surface.
View article: Implications of surfactant hydrophobic chain architecture on the Surfactant-Skin lipid model interaction
Implications of surfactant hydrophobic chain architecture on the Surfactant-Skin lipid model interaction Open
Although surfactants have been widely used in skin care and other related applications, our knowledge about how surfactants interact with stratum corneum (SC) lipids remains limited. This work reports how surfactants interact with a lipid …
View article: Self-assembly in saponin mixtures: Escin/tea, tea/glycyrrhizic acid, and escin/glycyrrhizic acid mixtures
Self-assembly in saponin mixtures: Escin/tea, tea/glycyrrhizic acid, and escin/glycyrrhizic acid mixtures Open
Saponins are plant based biosurfactants that are obtained from a wide variety of plant species. They are surface active glycosides with a hydrophobic group, which is commonly a triterpenoid or steroidal group, and saccharide hydrophilic un…
View article: Multivalent counterion induced multilayer adsorption at the air-water interface in dilute Aerosol-OT solutions
Multivalent counterion induced multilayer adsorption at the air-water interface in dilute Aerosol-OT solutions Open
In the AOT concentration range 0.5 to 2.0 mM surface multilayer formation occurs at the air-solution interface with the addition of Ca2+ or Al3+ counterions. Although the evolution in the surface structure with surfac…
View article: Adsorption and self-assembly properties of the plant based biosurfactant, Glycyrrhizic acid
Adsorption and self-assembly properties of the plant based biosurfactant, Glycyrrhizic acid Open
The adsorption isotherm is determined in water and in the presence of gelling additives, and compared with the adsorption behaviour of other saponins. Gelation has minimal impact on the adsorption; apart from producing a rougher surface wi…
View article: Multivalent electrolyte induced surface ordering and solution self-assembly in anionic surfactant mixtures: Sodium dodecyl sulfate and sodium diethylene glycol monododecyl sulfate
Multivalent electrolyte induced surface ordering and solution self-assembly in anionic surfactant mixtures: Sodium dodecyl sulfate and sodium diethylene glycol monododecyl sulfate Open
View article: The structure of alkyl ester sulfonate surfactant micelles: The impact of different valence electrolytes and surfactant structure on micelle growth
The structure of alkyl ester sulfonate surfactant micelles: The impact of different valence electrolytes and surfactant structure on micelle growth Open
View article: Self-assembly in dilute mixtures of non-ionic and anionic surfactants and rhamnolipd biosurfactants
Self-assembly in dilute mixtures of non-ionic and anionic surfactants and rhamnolipd biosurfactants Open
View article: Adsorption of hydrophobin/β-casein mixtures at the solid-liquid interface
Adsorption of hydrophobin/β-casein mixtures at the solid-liquid interface Open