pH sensitive adsorption of polypeptide/sodium dodecyl sulfate mixtures. by Penfold, J, Tucker, I, Thomas, R, Taylor, D, Zhang, X

“…The surface tension variation with surfactant concentration is complex, and between the critical aggregation concentration and critical micellar concentration there is a marked increase in the surface tension. …”

Organization of polymer-surfactant mixtures at the air-water interface: Sodium dodecyl sulfate and poly(dimethyldiallylammonium chloride) by Staples, E, Tucker, I, Penfold, J, Warren, N, Thomas, R, Taylor, D

“…The neutron reflectivity measurements show that this change in surface tension is associated with changes in the amount of SDS anal polymer at the interface. …”

Adsorption of polymer/surfactant mixtures at the air-water interface: Ethoxylated poly(ethyleneimine) and sodium dodecyl sulfate by Penfold, J, Taylor, D, Thomas, R, Tucker, I, Thompson, L

“…The adsorption of the polymer/surfactant mixture of ethoxylated poly(ethyleneimine) (PEI) and sodium dodecyl sulfate (SDS) at the air-water interface has been studied by specular neutron reflectivity and surface tension. PEI is a strong polyelectrolyte at low pH and behaves like a neutral polymer at high pH. …”

Adsorption of oppositely charged polyelectrolyte/surfactant mixtures. Neutron reflection from alkyl trimethylammonium bromides and sodium poly(styrenesulfonate) at the air/water in... by Taylor, D, Thomas, R, Li, P, Penfold, J

“…The surface tension and neutron reflection results were explained in terms of a model in which there were three kinds of polymer/surfactant complex.…”

The adsorption of oppositely charged polyelectrolyte/surfactant mixtures at the air/water interface: Neutron reflection from dodecyl trimethylammonium bromide/sodium poly(styrene s... by Taylor, D, Thomas, R, Hines, J, Humphreys, K, Penfold, J

“…If there is secondary adsorption of PS M or PS S, as for NaPSS/C 12TAB with or without electrolyte and PVPmCl/SDS with electrolyte, the surface tension should show a more modest increase at this concentration.…”

The role of electrolyte and polyelectrolyte on the adsorption of the anionic surfactant, sodium dodecylbenzenesulfonate, at the air-water interface. by Zhang, X, Taylor, D, Thomas, R, Penfold, J

“…The role of the polyelectrolyte, poly(ethyleneimine), PEI, and the electrolytes NaCl and CaCl(2), on the adsorption of the anionic surfactant, sodium dodecylbenzenesulfonate, LAS, at the air-water interface have been investigated by neutron reflectivity and surface tension. The surface tension data for the PEI/LAS mixtures are substantially affected by pH and the addition of electrolyte, and are consistent with a strong adsorption of surface polymer/surfactant complexes down to relatively low surfactant concentrations. …”

The role of electrolyte and polyelectrolyte on the adsorption of the anionic surfactant, sodium dodecylbenzenesulfonate, at the air-water interface by Zhang, X, Taylor, D, Thomas, R, Penfold, J

“…The role of the polyelectrolyte, poly(ethyleneimine), PEI, and the electrolytes NaCl and CaCl2, on the adsorption of the anionic surfactant, sodium dodecylbenzenesulfonate, LAS, at the air-water interface have been investigated by neutron reflectivity and surface tension. The surface tension data for the PEI/LAS mixtures are substantially affected by pH and the addition of electrolyte, and are consistent with a strong adsorption of surface polymer/surfactant complexes down to relatively low surfactant concentrations. …”

The interaction between sodium alkyl sulfate surfactants and the oppositely charged polyelectrolyte, polyDMDAAC, at the air-water interface: the role of alkyl chain length and elec... by Penfold, J, Tucker, I, Thomas, R, Taylor, D, Zhang, X, Bell, C, Breward, C, Howell, P

“…The effect of alkyl chain length and electrolyte on the adsorption of sodium alkyl sulfate surfactants and the oppositely charged polyelectrolyte, polyDMDAAC, at the air-water interface has been investigated by surface tension and neutron reflectivity. The variations in the patterns of adsorption and surface tension behavior with alkyl chain length and electrolyte are discussed in the context of the competition between the formation of surface active surfactant/polyelectrolyte complexes and polyelectrolyte/surfactant micelle complexes in solution. …”

Nature of Amine-Surfactant Interactions at the Air-Solution Interface (dagger). by Penfold, J, Thomas, R, Zhang, X, Taylor, D

“…The surface tension and adsorption behavior of polymer/surfactant mixtures of polyethyleneimine (PEI)/sodium dodecyl sulfate (SDS) is strongly dependent on pH. …”

Polyelectrolyte/surfactant mixtures at the air-solution interface by Penfold, J, Thomas, R, Taylor, D

“…Recent studies, using a range of surface sensitive techniques, which include ellipsometry, neutron and X-ray reflectivity, surface tension and interfacial rheology, have considerably enhanced the understanding of their surface behaviour, which can be rationalized in terms of the competition between the formation of surface active polymer/surfactant complexes and solution polymer/surfactant micelle complexes. © 2006 Elsevier B.V. …”

The impact of electrolyte on the adsorption of sodium dodecyl sulfate/polyethyleneimine complexes at the air-solution interface. by Penfold, J, Tucker, I, Thomas, R, Taylor, D, Zhang, J, Zhang, X

“…These results, obtained from a combination of neutron reflectivity and surface tension, highlight the substantial enhancement in surfactant adsorption achieved by the addition of a combination of the polyelectrolyte, PEI, and a simple electrolyte. …”

Polymer/surfactant interactions at the air/water interface. by Taylor, D, Thomas, R, Penfold, J

“…The strong surface interactions resulting from the electrostatic attractions in these systems have a very pronounced effect on both the surface tension behaviour and on adsorbed layers consisting of polymer/surfactant complexes, often giving rise to significant surface ordering.…”

The adsorption of oppositely charged polyelectrolyte/surfactant mixtures: Neutron reflection from dodecyl trimethylammonium bromide and sodium poly(styrene sulfonate) at the air/wa... by Taylor, D, Thomas, R, Penfold, J

“…The interactions between the cationic surfactant dodecyl trimethylammonium bromide (C 12TAB) and the anionic polymer sodium poly(styrene sulfonate) (NaPSS) have been studied using surface tension and tron reflectivity techniques. Neutron reflection shows that the surface consists of a mixture of polymer and surfactant over surfactant concentrations ranging from twice the critical micelle concentration (CMC) to 1/100 of the CMC for polymer concentrations between 20 and 140 ppm. …”

The effects of the addition of the polyelectrolyte, poly(ethyleneimine), on the adsorption of mixed surfactants of sodium dodecylsulfate and dodecyldimethylaminoacetate at the air-... by Zhang, X, Taylor, D, Thomas, R, Penfold, J

“…The effects of the addition of the polyelectrolyte, poly(ethyleneimine), PEI, on the adsorption of the mixed surfactants of sodium dodecylsulfate, SDS, and dodecyldimethylaminoacetate, dodecyl betaine, at the air-water interface have been investigated using neutron reflectivity and surface tension. In the absence of PEI the SDS and dodecyl betaine surfactants strongly interact and exhibit synergistic adsorption at the air-water interface. …”

The effects of the addition of the polyelectrolyte, poly(ethyleneimine), on the adsorption of mixed surfactants of sodium dodecylsulfate and dodecyldimethylaminoacetate at the air-... by Zhang, X, Taylor, D, Thomas, R, Penfold, J

“…The effects of the addition of the polyelectrolyte, poly(ethyleneimine), PEI, on the adsorption of the mixed surfactants of sodium dodecylsulfate, SDS, and dodecyldimethylaminoacetate, dodecyl betaine, at the air-water interface have been investigated using neutron reflectivity and surface tension. In the absence of PEI the SDS and dodecyl betaine surfactants strongly interact and exhibit synergistic adsorption at the air-water interface. …”

Adsorption of DNA and dodecyl trimethylammonium bromide mixtures at the air/water interface: a neutron reflectometry study. by Zhang, J, Taylor, D, Li, P, Thomas, R, Wang, J, Penfold, J

“…The interactions between dodecyl trimethylammonium bromide (C12TAB) and two samples of DNA with widely differing molecular weights have been studied using surface tension and neutron reflectometry. Neutron reflection data show that the surfactant and polymer are adsorbed together in a highly cooperative fashion over a 1000-fold change in surfactant concentration. …”

Interaction of a Cationic Gemini Surfactant with DNA and with Sodium Poly(styrene sulphonate) at the Air/Water Interface: A Neutron Reflectometry Study (dagger). by Vongsetskul, T, Taylor, D, Zhang, J, Li, P, Thomas, R, Penfold, J

“…The interactions between a dicationic gemini surfactant with a six-hydrocarbon spacer (1,2-bis(dodecyldimethylammonio)hexane dibromide, C(12)C(6)C(12)Br(2)) and anionic polyelectrolyte DNA or sodium(polystyrene sulfonate) (NaPSS) at the air/solution interface have been studied and compared using neutron reflectometry together with surface tension. In the presence of the dichained cationic gemini surfactant, DNA and NaPSS display very different adsorption behaviors. …”

Adsorption of polyelectrolyte/surfactant mixtures at the air-water interface: modified poly(ethyleneimine) and sodium dodecyl sulfate. by Zhang, X, Taylor, D, Thomas, R, Penfold, J

“…The adsorption of surfactant/polyelectrolyte mixtures of sodium dodecyl sulfate (SDS) and different modified poly(ethyleneimine) (PEI) polyelectrolytes at the air-water interface has been studied using neutron reflectivity and surface tension. Modification of the PEI by the addition of short ethylene oxide (EO) or propylene oxide (PO) groups is shown to have an impact upon the surface adsorption behavior. …”