Results 281 to 290 of about 1,012,835 (322)

Enhancement of the Ionic Conductivity in Solid‐Solid‐Dispersions by Surface Induced Defects

Berichte der Bunsengesellschaft für physikalische Chemie, 1984
AbstractThe finding that dispersions of insulators such as alumina or silica in ionic conductors may exhibit considerably enhanced ionic conductivities compared to the pure material, has become a promising topic for optimizing the electric properties in solid state research.
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The effect of processing on the surface physical stability of amorphous solid dispersions

European Journal of Pharmaceutics and Biopharmaceutics, 2014
The focus of this study was to investigate the effect of processing on the surface crystallization of amorphous molecular dispersions and gain insight into the mechanisms underpinning this effect. The model systems, amorphous molecular dispersions of felodipine-EUDRAGIT® E PO, were processed both using spin coating (an ultra-fast solvent evaporation ...
Qi, Sheng, Moffat, Jonathan, Craig, Duncan, Yang, Ziyi, Nollenberger, Kathrin, Albers, Jessica   +5 more
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Dispersive Solid Phase Extraction for In-Sorbent Surface Attenuated Total Reflection Infrared Detection

Analytical Chemistry, 2008
The combination of dispersive solid phase extraction (DSPE) and attenuated total reflection (ATR) infrared spectroscopy is presented using the joint determination of sorbic and benzoic acids in juice samples as a model analytical problem. The dispersive extraction process allows the selective extraction of the target analytes from the sample matrix ...
M C, Alcudia-León, R, Lucena, S, Cárdenas, M, Valcárcel   +3 more
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Organic Molecule Adsorption on Solid Surfaces: Chemical Bonding, Mutual Polarization and Dispersion Interaction

ChemInform, 2006
AbstractChemInform is a weekly Abstracting Service, delivering concise information at a glance that was extracted from about 200 leading journals. To access a ChemInform Abstract, please click on HTML or PDF.
W.G. Schmidt, K. Seino, M. Preuss, A. Hermann, F. Ortmann, F. Bechstedt   +5 more
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A surface-immobilized model compound investigation of catalytic reactions in dispersed solids

Energy & Fuels, 1993
Reactions of the silica-immobilized model compounds, ≃Ph(CH 2 ) n Ph(n = 1, 3, 4) and ≃PhCH 2 CH 2 OPh, with dispersed acid catalysts have been studied at 310-375 °C in the solid state. Reactions of these model compounds in the presence of a small particle size (15 nm) silica-1% alumina catalyst yield products typically expected for acid-catalyzed ...
A. C. Buchanan, Phillip F. Britt, Kimberly B. Thomas, Cheryl A. Biggs   +3 more
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Wetting of Solids by Surface Active Agents: Dispersion and the Polar Surface Tension Components

1986
Wetting of solids bу various surfactant solutions was investigated by the contact angle measurements. The results were analyzed using an approximation that the surfactant solutions have intrinsic dispersion (D) and polar (P) surface forces, analogous to solids and pure liquids. Using this approach gave the same value for the solid surface tension (i. e.
K. S. Birdi, E. H. Stenby
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Surface Enrichment and Depletion of the Active Ingredient in Spray Dried Amorphous Solid Dispersions

Pharmaceutical Research, 2018
To study the effects of physicochemical properties of drug and polymer, as well as the drug-polymer interactions, on the surface composition of SDDs.Ethanol solutions containing a model drug (IMC, NMP or FCZ) and a model polymer (PVPK12, PVPK30 or PVP-VA) were spray dried, and the surface composition of SDDs was analyzed by XPS. The surface tensions of
Zhen, Chen, Kuan, Yang, Chengbin, Huang, Alan, Zhu, Lian, Yu, Feng, Qian   +5 more
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Molecular Indicators of Surface and Bulk Instability of Hot Melt Extruded Amorphous Solid Dispersions

Pharmaceutical Research, 2014
To identify molecular indicators of bulk and surface instabilities of amorphous dispersions prepared by hot melt extrusion.Four model drugs with different physicochemical properties were formulated with EUDRAGIT(®) E PO using hot melt extrusion. Samples were aged under a range of conditions for up to 6 months and characterized using SEM, ATR-FTIR, PXRD
Yang, Ziyi, Nollenberger, Kathrin, Albers, Jessica, Craig, Duncan, Qi, Sheng   +4 more
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Enhancing Ketoprofen Solubility: A Strategic Approach Using Solid Dispersion and Response Surface Methodology

Current Radiopharmaceuticals
Background: In the pharmaceutical sciences, the solubility profile of therapeutic molecules is crucial for identifying and formulating drugs and evaluating their quality across the drug discovery pipeline based on factors like oral bioavailability, metabolic transformation, biodistribution kinetics, and potential toxicological implications.
Devika, Tripathi, Dinesh Kumar, Sharma, Jagannath, Sahoo   +2 more
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Application of Shereshefsky's equation for the determination of solid surface dispersion energy

Journal of the Chemical Society D: Chemical Communications, 1971
A simple method for obtaining solid surface dispersion energies by measuring adsorption from solution and applying Shereshefsky's equation has been tested with experimental data from the literature on the adsorption of stearic acid from C6H6 solution on to mercury, iron, copper, and nickel giving results that compare favourably with those obtained by ...
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