A5019146658- Surfactants and Colloidal Systems
- NMR spectroscopy and applications
- Advanced NMR Techniques and Applications
- Spectroscopy and Quantum Chemical Studies
- Analytical Chemistry and Chromatography
- Advanced Neuroimaging Techniques and Applications
- Thermodynamic properties of mixtures
- Molecular spectroscopy and chirality
- Material Dynamics and Properties
- Lipid Membrane Structure and Behavior
- Electrostatics and Colloid Interactions
- Drug Solubulity and Delivery Systems
- Proteins in Food Systems
- Advanced MRI Techniques and Applications
- Diffusion Coefficients in Liquids
- Chemical and Physical Properties in Aqueous Solutions
- Advanced Polymer Synthesis and Characterization
- Protein Interaction Studies and Fluorescence Analysis
- Polysaccharides Composition and Applications
- Osteoarthritis Treatment and Mechanisms
- Microfluidic and Capillary Electrophoresis Applications
- Total Knee Arthroplasty Outcomes
- Food Chemistry and Fat Analysis
- Electron Spin Resonance Studies
- Photochemistry and Electron Transfer Studies
Lund University
2012-2023
University of Coimbra
2006-2010
Universitat de Miguel Hernández d'Elx
2010
Universidad de Burgos
2010
University of Florence
2007-2008
Universidade do Porto
2006-2008
Chalmers University of Technology
2002-2007
AstraZeneca (Sweden)
2004-2007
University College Dublin
2007
University of Naples Federico II
2006
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTExamination of the lamellar phase aerosol OT/water using pulsed field gradient nuclear magnetic resonanceP. T. Callaghan and O. SodermanCite this: J. Phys. Chem. 1983, 87, 10, 1737–1744Publication Date (Print):May 1, 1983Publication History Published online1 May 2002Published inissue 1 1983https://doi.org/10.1021/j100233a019RIGHTS & PERMISSIONSArticle Views376Altmetric-Citations130LEARN ABOUT THESE METRICSArticle Views are COUNTER-compliant sum...
The n-octyl β-d-glucoside/water binary phase diagram (temperature vs concentration) and the aggregation parameters of individual phases have been determined. n-Octyl β-d-glucoside forms four different together with water. At temperatures below 22 °C, there is an isotropic solution region from neat water extending up to almost 60 wt % β-d-glucoside. As concentration further increased, three liquid crystalline form in following order: hexagonal, cubic, lamellar. high surfactant concentrations...
Abstract Surfactant molecules are amphipathic and posses complicated solution chemistry self‐assembly properties. In addition to being of enormous practical significance, the physical characterization surfactant systems presents a rich area condensed matter physics. This article focuses on application interpretation commonly used NMR approaches for probing these systems. particular, use relaxation, diffusometry and, more briefly, electrophoretic determine characteristics such as micellar...
The diffusion of water and the cross relaxation between cellulose in a hydrated paper system were followed with Goldman−Shen pulsed-field-gradient stimulated-echo NMR pulse sequences as function moisture content. coefficient measured along plane sheet is very sensitive to content; more leads faster diffusion. rate independent content but high enough severely influence evaluation data. From experiments, structural information about porous network formed by microfibrils interior fibers obtained.
Vesicles form spontaneously in a variety of aqueous mixtures oppositely charged surfactants. Here we report the morphological transition from spherical micelles to vesicles observed dodecyltrimethylammonium chloride (DTAC) and sodium dodecylbenzenesulfonate (SDBS) as probed by complementary techniques quasielastic light scattering (QLS), NMR self-diffusion relaxation measurements, time-resolved fluorescence quenching (TRFQ) experiments. In these mixtures, there is limited growth with changes...
The binding of SDS to cellulose polymers in the semidilute concentration regime has been studied by means NMR, ion-selective electrode, and a time-resolved fluorescence technique. Two have used, differing only low degree hydrophobic modification one them. NMR self-diffusion activity measurements show that nonmodified polymer fairly pronounced critical aggregation (cac), while hydrophobically modified is less cooperative up about cac polymer/SDS system. T2 relaxation studies indicate...
The formation of triblock copolymer/surfactant complexes upon mixing a nonionic Pluronic polymer (PEO-PPO-PEO) with cationic surfactant, hexadecyltrimethylammonium chloride (CTAC), has been studied in dilute aqueous solutions using small-angle X-ray scattering, static and dynamic light self-diffusion NMR. copolymer (denoted P123, EO(20)PO(68)EO(20)) forms micelles radius 10 nm molecular weight 7.5 x 10(5), composed hydrophobic PPO-rich core 4 water swollen PEO corona. P123/CTAC system...
Diffusion measurements by nuclear magnetic resonance (NMR) spectroscopy were used to investigate the host-guest association between beta-cyclodextrin (CD) and alkyltrimethylammonium bromide surfactants with different chain lengths, ranging from 6 up 16 carbons. The scope limitations of method in study formation inclusion complexes are discussed. influences presence CD micellization process have been studied, apparent critical micellar concentration self-diffusion coefficients species present...
This work addresses the problem of determining micellar aggregation numbers for dilute ionic surfactant systems by means time-resolved fluorescence quenching method. We argue that use quenchers are themselves surfactants gives us two advantages. First, altering micelles caused solubilization quencher molecules is minimized. Second, distribution between and aqueous subphase can be obtained. The latter point particularly important case when adsorbed at interfaces or associated with polymers....
We have studied the phase behavior and microstructure of water/1-propanol/soybean phosphatidylcholine (SbPC)/triglyceride systems. Microemulsions are formed with both medium-chain triglycerides (MCT) long-chain triglycerides. The amount SbPC 1-propanol needed to form a microemulsion increases as chain length triglyceride increases. MCT system was investigated in more detail compared hexadecane system. pulsed field gradient NMR data for suggest that microemulsions at low concentrations 0 < α...
A theoretical framework for the description of phenomenon electro-osmosis is developed. The main emphasis work to develop relations that describe time and spatial resolution velocity liquid in contact with a charged surface when train electric field pulses are applied parallel surface. motivated by recent development NMR detected electrophoresis powerful tool colloid chemistry. In this approach one employs pulsed fields, process complication. developing framework, we make use results from...
The thermodynamics and kinetics of formation host-guest complexes between a series bolaform surfactants type C n Me 6 (2+)2Br (-) ( = 8, 10, 12) alpha-cyclodextrin beta-cyclodextrin were studied with the aid isothermal titration calorimetry (ITC) at 298.15 308.20 K. association constant, enthalpy, entropy determined. obtained thermodynamic parameters are compared for micelle related cationic surfactant. difference in magnitude sign alpha-CD beta-CD is discussed based on curvature cavity CD....
The use of amino acids for the synthesis novel surfactants with vesicle-forming properties potentially enhances biocompatibility levels needed a viable alternative to conventional lipid vesicles. In this work, formation and characterization catanionic vesicles by newly synthesized lysine- serine-derived have been investigated means phase behavior mapping PFG-NMR diffusometry cryo-TEM methods. lysine-derived are double-chained anionic molecules bearing pseudogemini configuration, whereas...