A5076516919- Surfactants and Colloidal Systems
- Spectroscopy and Quantum Chemical Studies
- Electrostatics and Colloid Interactions
- Material Dynamics and Properties
- Nuclear Physics and Applications
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Lipid Membrane Structure and Behavior
- Rheology and Fluid Dynamics Studies
- Polymer crystallization and properties
- Phase Equilibria and Thermodynamics
- Pickering emulsions and particle stabilization
- Coagulation and Flocculation Studies
- Iron oxide chemistry and applications
- Polymer Nanocomposites and Properties
- Minerals Flotation and Separation Techniques
- Analytical Chemistry and Chromatography
- Clay minerals and soil interactions
- Atmospheric chemistry and aerosols
- Glass properties and applications
- Soil and Unsaturated Flow
- NMR spectroscopy and applications
- Polymer Surface Interaction Studies
- Advanced Polymer Synthesis and Characterization
- Granular flow and fluidized beds
Uppsala University
2015-2024
Institut Laue-Langevin
1989-2010
University of Southampton
2010
Lund University
2008-2010
University of Cambridge
1993-2008
Cavendish Hospital
1993-2007
King's College London
1999-2007
Bridge University
2007
Studsvik (Sweden)
2004-2006
Malmö University
2006
A map of stability for various water/oil/pea protein compositions has been plotted from the numerous reported results. Two clear regions were identified. High internal oil phase emulsions with 70–80%, v/v content stabilized by total pea concentration <2.5%, w/v showed stability. Low 10–30%, a range concentrations >0.5%, have also identified as stable. Intermediate and >4% are unexplored likely to be areas fruitful future research. The wide suggests that different stabilization mechanisms...
The use of specular neutron reflection to study a wide variety problems in surface and interfacial chemistry is introduced discussed. Recent developments reflectometry instrumentation, their implementation the design SURF reflectometer at ISIS pulsed source, are described. has been optimised for soft matter new experimental results that exploit novel features this second generation presented discussed context opportunities future studies technique instrumentation presents. examples from...
Bulk fluid flow induced by an ac electric potential with a peak voltage below the ionization of water is described. The applied to ionic solution planar array electrodes arranged in pairs so that one edge large electrode close opposing narrow electrode. During half cycle, double layer on surface charges as current flows between electrodes. charge nonuniform manner producing gradient parallel This drives ions across and this turn drags surface. anisotropic nature used produce net fluid....
Seed extracts from Moringa oleifera are of wide interest for use in water purification where they can play an important role flocculation; also have potential as anti-microbial agents. Previous work has focused on the crude protein extract. Here we describe detailed biophysical characterization individual proteins these seeds. The results provide new insights relating to active compounds involved. One fraction, designated Mo-CBP3, been characterized at a molecular level using range...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMacroscopic and microscopic thermodynamic observations in swollen poly(vinyl acetate) networksFerenc Horkay, Anne Marie Hecht, Simon Mallam, Erik Geissler, Adrian R. RennieCite this: Macromolecules 1991, 24, 10, 2896–2902Publication Date (Print):May 1, 1991Publication History Published online1 May 2002Published inissue 1 1991https://pubs.acs.org/doi/10.1021/ma00010a040https://doi.org/10.1021/ma00010a040research-articleACS PublicationsRequest reuse...
Specular neutron reflection has been used to determine the structure and composition of bovine β-casein adsorbed on a solid surface from an aqueous phosphate-buffered solution at pH 7. The protein was hydrophobic monolayer self-assembled deuterated octadecyltrichlorosilane silicon (111) surface. A two-layer formed consisting one dense layer thickness 23 ± 1 angstroms coverage 1.9 milligrams per square meter adjacent external protruding into 35 12 percent volume fraction. (β-casein) is...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStructure of a cationic surfactant layer at the silica-water interfaceA. R. Rennie, E. M. Lee, A. Simister, and K. ThomasCite this: Langmuir 1990, 6, 5, 1031–1034Publication Date (Print):May 1, 1990Publication History Published online1 May 2002Published inissue 1 1990https://pubs.acs.org/doi/10.1021/la00095a025https://doi.org/10.1021/la00095a025research-articleACS PublicationsRequest reuse permissionsArticle Views458Altmetric-Citations124LEARN...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMicroscopic and macroscopic thermodynamic observations in swollen poly(dimethylsiloxane) networksSimon Mallam, Ferenc Horkay, Anne Marie Hecht, Adrian R. Rennie, Erik GeisslerCite this: Macromolecules 1991, 24, 2, 543–548Publication Date (Print):January 1, 1991Publication History Published online1 May 2002Published inissue 1 January 1991https://pubs.acs.org/doi/10.1021/ma00002a031https://doi.org/10.1021/ma00002a031research-articleACS...
The oxidation of organic films on cloud condensation nuclei has the potential to affect climate and precipitation events. In this work we present a study monolayer deuterated oleic acid (cis-9-octadecenoic acid) at air–water interface by ozone determine if removes film or replaces it with product film. A range different aqueous sub-phases were studied. surface excess material was followed neutron reflection whilst pressure using Wilhelmy plate. data reveal that approximately half remains...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetics of the Simultaneous Phase Separation and Gelation in Solutions Dextran GelatinR. H. Tromp, A. R. Rennie, L. JonesCite this: Macromolecules 1995, 28, 12, 4129–4138Publication Date (Print):June 1, 1995Publication History Published online1 May 2002Published inissue 1 June 1995https://pubs.acs.org/doi/10.1021/ma00116a012https://doi.org/10.1021/ma00116a012research-articleACS PublicationsRequest reuse permissionsArticle...
Neutron reflection has been used to investigate the structure of hexadecyltrimethylammonium bromide (C16TAB) layers adsorbed at silicon/silicon oxide/aqueous interface. Separate isotopic labeling groups four methylene a time made it possible determine layer higher resolution than previously possible. The was investigated on smooth and rough surfaces. roughness surface significant effect properties layer. On bilayer is shown be thicker unsymmetrical in direction normal. coverage also found...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTStudy of the adsorption from aqueous solution hexaethylene glycol monododecyl ether on silica substrates using technique neutron reflectionD. C. McDermott, J. R. Lu, E. M. Lee, K. Thomas, and A. RennieCite this: Langmuir 1992, 8, 4, 1204–1210Publication Date (Print):April 1, 1992Publication History Published online1 May 2002Published inissue 1 April...
This paper reports a time-resolved small-angle X-ray scattering study of in situ Stöber silica synthesis. The hydrolysis reaction is initiated by rapidly mixing equal amounts alcoholic solutions ammonia and tetraethyl orthosilicate, using stopped-flow device coupled to flow-through capillary cell. Measurements covered the wave vector (q) range 0.02 ≤ q 6 nm-1 time (t) 0.1 t 1000 s. combination high sensitivity, low background, dynamic experimental setup permitted observation primary...
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTAdsorption of nonionic surfactants on hydrophilic surfaces. An experimental and theoretical study association in the adsorbed layerMarcel R. Bohmer, Luuk K. Koopal, Rob Janssen, Ellen M. Lee, Robert Thomas, Adrian RennieCite this: Langmuir 1992, 8, 9, 2228–2239Publication Date (Print):September 1, 1992Publication History Published online1 May 2002Published inissue 1 September...
The coexistence of two phases in concentrated dispersions monodispersed platelike particles is reported. Small-angle neutron diffraction has been used to identify a highly ordered phase which coexists at equilibrium with less ordered, dense phase. interparticle interactions were varied by adjusting the salt concentration, and this influenced concentration transition occurred. Columnar or layer structures could account for observed pattern from are discussed.
We have used neutron reflection to study, for the first time, structure of a surfactant layer adsorbed at hydrophobic solid/water interface. Isotopic labeling water and self-assembled octadecyltrichlorosilane (OTS) was characterize protonated deuteriated layers on silicon oxide (111) face silicon. This is time composition such has been examined under water. Some penetration into both observed. In former case this attributed roughness in latter imperfections OTS layer. The thickness found be...
Abstract Protein extracted from Moringa oleifera (MO) seeds has been advocated as a cheap and environmental friendly alternative to ionic flocculants for water purification. However, the nature mechanism of its interaction with particles in water, well dissolved surface‐active molecules, are not understood. In this article, we report studies protein four surfactants using dynamic light scattering (DLS), zeta‐potential turbidity measurements. Zeta‐potential measurements identified points...
The presence of unsaturated lipids in lung surfactant is important for proper respiratory function. In this work, we have used neutron reflection and surface pressure measurements to study the reaction ubiquitous pollutant gas-phase ozone, O3, with pure mixed phospholipid monolayers at air-water interface. results reveal that lipid 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine, POPC, ozone leads rapid loss terminal C9 portion oleoyl strand POPC from interface accompanied by an increase...
Abstract Additive manufacturing (or 3D printing) opens the possibility of creating new designs and objects with materials rapidly economically. Particularly for use polymers polymer composites, simple printers can make high quality products, these be produced easily in offices, schools workshops laboratories. This technology has opened a route many to test ideas or custom devices. It is possible manufacture complex geometries that would difficult even impossible create traditional methods....