scholarly journals Understanding the structure and dynamics of cationic surfactants from studies of pure solid phases

2019 ◽  
Vol 21 (47) ◽  
pp. 25945-25951 ◽  
Author(s):  
Jeremy K. Cockcroft ◽  
André Shamsabadi ◽  
Han Wu ◽  
Adrian R. Rennie
Keyword(s):  
Cationic Surfactants ◽  
Phase Behaviour ◽  
Structure And Dynamics ◽  
Alkyltrimethylammonium Bromides ◽  
Solid Phases ◽  
Increasing Temperature

Unravelling the phase behaviour of n-alkyltrimethylammonium bromides (C10 to C18): from tight-packed interdigitation to rotational disorder with increasing temperature.

Inhomogeneous relaxation dynamics and phase behaviour of a liquid crystal confined in a nanoporous solid

Soft Matter ◽  
2015 ◽  
Vol 11 (16) ◽  
pp. 3176-3187 ◽  
Author(s):  
Sylwia Całus ◽  
Andriy V. Kityk ◽  
Manfred Eich ◽  
Patrick Huber
Keyword(s):  
Liquid Crystal ◽  
Dielectric Spectroscopy ◽  
Phase Behaviour ◽  
Relaxation Dynamics ◽  
Thermotropic Liquid Crystal ◽  
Structure And Dynamics

Dielectric spectroscopy reveals a radial partitioning in the structure and dynamics of a thermotropic liquid crystal confined in silica nanochannels.

scholarly journals Phase Behaviour of the System Propene/Polypropene at High Pressure

2011 ◽  
Vol 2011 ◽  
pp. 1-5
Author(s):  
Oliver Ruhl ◽  
Gerhard Luft ◽  
Patrick Brant ◽  
John Richard Shutt
Keyword(s):  
Cloud Point ◽  
High Pressures ◽  
Weight Fraction ◽  
Phase Behaviour ◽  
Critical Weight ◽  
Molecular Weights ◽  
Metal Bellows ◽  
Similar Density ◽  
Increasing Temperature ◽  
Good Agreement

The phase behaviour of mixtures of supercritical propene and a number of polypropenes, which have a similar density but significantly different molecular weights and tacticities, was investigated in a broad range of polymer weight fractions and temperatures at high pressures. The cloud-point pressures were measured optically, using a view cell which was equipped with two windows made of synthetic sapphire and a metal bellows to accurately adjust the pressure. The cloud-point pressures were found in the range from 29 to 37 MPa decreasing with increasing polymer weight fraction and increasing with increasing temperature and polymer molecular weight. The critical weight fraction was found below 2 to 6 wt.-%. Whereas the cloud-point pressures of atactic and syndiotactic samples were high and very similar, the isotactic species exhibit distinctly lower values. The results, extrapolated to lower temperatures, show good agreement with the literature data.

scholarly journals Phase Behaviour of 1-Ethyl-3-methylimidazolium Thiocyanate Ionic Liquid with Catalytic Deactivated Compounds and Water at Several Temperatures: Experiments and Theoretical Predictions

2011 ◽  
Vol 2011 ◽  
pp. 1-13 ◽  
Author(s):  
Ramalingam Anantharaj ◽  
Tamal Banerjee
Keyword(s):  
Surface Tension ◽  
Refractive Index ◽  
Activity Coefficient ◽  
Excess Molar Volumes ◽  
Ideal Liquid ◽  
Phase Behaviour ◽  
Ring Compounds ◽  
Theoretical Predictions ◽  
Nitrogen Mixture ◽  
Increasing Temperature

Density, surface tension and refractive index were determined for the binary mixture of catalytic deactivated compounds with 1-ethyl-3-methylimidazolium thiocyanate{[EMIM][SCN]}at temperature of (298.15 to 323.15) K. For all the compounds with ILs, the densities varied linearly in the entire mole fraction with increasing temperature. From the obtained data, the excess molar volume and deviation of surface tension and refractive index have been calculated. A strong interaction was found between similar (cation-thiophene or cation-pyrrole) compounds. The interaction of IL with dissimilar compounds such as indoline and quinoline and other multiple ring compounds was found to strongly depend on the composition of IL at any temperatures. For the mixtures, the surface tension decreases in the order of: thiophene > quinoline > pyridine > indoline > pyrrole > water. In general from the excess volume studies, the IL-sulphur/nitrogen mixture has stronger interaction as compared to IL-IL, thiophene-thiophene or pyrrole-pyrrole interaction. The deviation of surface tension was found to be inversely proportional to deviation of refractive index. The quantum chemical based COSMO-RS was used to predict the non-ideal liquid phase activity coefficient for all mixtures. It indicated an inverse relation between activity coefficient and excess molar volumes.

Universal Behaviour of the Structure and Dynamics of Micelles Formed from Cationic Surfactants

2014 ◽  
Vol 228 (6-7) ◽  
Author(s):  
Holger Gibhardt ◽  
Chandrashekara Rajashekara Haramagatti ◽  
Akhmed Khysainovich Islamov ◽  
Oleksandr Igorovych Ivankov ◽  
Alexander Ivanovich Kuklin ◽  
...  
Keyword(s):  
Cationic Surfactants ◽  
Structure And Dynamics ◽  
Universal Behaviour

Thermodynamic Modelling of Iron Solubility in Sulphide Mineral Leaching

2009 ◽  
Vol 71-73 ◽  
pp. 441-444 ◽  
Author(s):  
Pauliina Nurmi ◽  
Lasse Ahonen ◽  
Olli H. Tuovinen
Keyword(s):  
Experimental Data ◽  
Solid Solutions ◽  
Sulphide Mineral ◽  
Data Set ◽  
Iron Solubility ◽  
Hydronium Jarosite ◽  
Effects Of Ph ◽  
Solid Phases ◽  
Increasing Temperature ◽  
Mineral Leaching

In this study the effects of pH and temperature on iron solubility were predicted using the geochemical modelling code PHREEQC and the thermodynamic database WATEQ4F. The modelling results demonstrated that the solubility of secondary solid phases formed under acid bioleaching conditions decreases with increasing temperature and also with increasing pH. Modelling calculations showed that bioleaching solutions are typically supersaturated with respect to K-, Na-, NH4-, and H3O-jarosites and the precipitates are typically solid solutions containing their mixtures. Jarosite solubility modelling results were also compared with a data set from jarosite synthesis experiments. Model-derived temperature dependence of hydronium-jarosite correlated very well with the actual experimental data.

Structure and dynamics in an organic ionic plastic crystal, N-ethyl-N-methyl pyrrolidinium bis(trifluoromethanesulfonyl) amide, mixed with a sodium salt

2014 ◽  
Vol 2 (11) ◽  
pp. 3993-4003 ◽  
Author(s):  
Maria Forsyth ◽  
Tarekegn Chimdi ◽  
Aaron Seeber ◽  
Daniel Gunzelmann ◽  
Patrick C. Howlett
Keyword(s):  
Solid State ◽  
Sodium Salt ◽  
Phase Behaviour ◽  
Plastic Crystal ◽  
Structure And Dynamics ◽  
First Time

We present for the first time, the solid state phase behaviour of the organic ionic plastic crystal (OIPC) N-methyl-N-ethyl-pyrrolidinium bis(trifluoromethanesulfonyl)amide, [C2mpyr][NTf2], upon mixing with the sodium salt, Na[NTf2].

Structure and Dynamics of Cationic Surfactants Intercalated in Synthetic Clays

Langmuir ◽  
2004 ◽  
Vol 20 (7) ◽  
pp. 2982-2985 ◽  
Author(s):  
R. Müller ◽  
J. Hrobarikova ◽  
C. Calberg ◽  
R. Jérôme ◽  
J. Grandjean
Keyword(s):  
Cationic Surfactants ◽  
Structure And Dynamics

scholarly journals Partial molecular volumes of cholesterol and phosphatidylcholine in mixed bilayers

2017 ◽  
Vol 64 (2) ◽  
pp. 1-3 ◽  
Author(s):  
J. Gallová ◽  
K. Želinská ◽  
P. Balgavý
Keyword(s):  
Phase Transition ◽  
Simple Model ◽  
Lipid Bilayer ◽  
Specific Volume ◽  
Biological Membrane ◽  
Phase Behaviour ◽  
Molecular Volume ◽  
Ideal Mixing ◽  
Multilamellar Liposomes ◽  
Increasing Temperature

Abstract Dispersion of multilamellar liposomes of dimyristoylphosphatidylcholine (DMPC) and cholesterol (CHOL) were studied by vibrational densitometer for the CHOL mole fractions X = 0−0.54 in the temperature range 18−50 °C, both below and above the main phase transition. DMPC-CHOL bilayers served as a simple model for lipidic part of biological membrane. Volumetric parameters are essential not only to evaluate the data obtained by scattering and diffraction methods on model membranes but can provide valuable information about molecular packing in bilayers and the phase behaviour of lipid-CHOL mixtures. In this paper, preliminary results regarding the changes in the specific volume of lipid bilayer with increasing temperature and CHOL content are presented. Different values of apparent molecular volume of CHOL for different CHOL mole fraction pointed out the non-ideal mixing of DMPC and CHOL.

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