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Phase Material (phase + material)

Distribution by Scientific Domains

Polymers and Materials Science	50%

Selected Abstracts

An initial assessment of the use of gradient elution in microemulsion and micellar liquid chromatography

JOURNAL OF SEPARATION SCIENCE, JSS, Issue 17-18 2004
Simon M. Bryant
Abstract Novel microemulsion and micellar HPLC separations have been achieved using gradient elution and columns packed with reverse phase material. Initial attempts at gradient microemulsion liquid chromatography proved impossible on use of a microemulsion successfully used in capillary electrophoresis. Optimisation of the microemulsion composition allowed the generation of stable microemulsions to achieve separations in HPLC. The novel use of organic-solvent micellar chromatography in gradient elution mode was shown to give efficient separations. A range of efficient separations of pharmaceuticals and related impurities were obtained. Acidic, basic, and neutral solutes were resolved covering a wide range of water solubilities and polarities. Elution times were in the order of 4,15 minutes. Separations were briefly compared to those accomplished with a micellar HPLC system. It is proposed that gradient elution in both microemulsion and micellar HPLC can be regarded as a highly successful means of achieving resolution of complex mixtures and should be considered for routine analysis and further investigation. [source]

A Multi-phase-field model including inelastic deformation for solid state transformations

PROCEEDINGS IN APPLIED MATHEMATICS & MECHANICS, Issue 1 2008
Stefan BenkeArticle first published online: 26 FEB 200
A multi phase field model is presented in order to take the plastic deformation during a solid state transformation into account and to investigate its effect on the transformation kinetics and morphology in a multi phase material. The model is formulated consistently with the multi phase field model for diffusional and surface driven phase transformations [1]. (© 2008 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim) [source]

Deposition of Antimony and Antimony Oxides by MOCVD,

CHEMICAL VAPOR DEPOSITION, Issue 1 2004
C.P. Myers
Abstract Thin films of antimony and antimony oxides have been deposited by metal,organic (MO) CVD from a variety of metal,organic precursors at temperatures in the range 150,650,°C under both atmospheric and reduced pressure. Below 400,°C, uniform films of pure senarmontite (Sb2O3) with a microstructure and crystal texture that was strongly dependent on the deposition temperature, were deposited. Above 400,°C, mixed phase material was produced, with isolated crystallites of pure antimony becoming the dominant phase as the temperature was increased. The maximum temperature at which pure senarmontite could be formed was higher for larger precursor ligands. Addition of oxygen to the precursor flow led to the production of higher antimony oxidation states. [source]

The Remarkable Thermal Stability of Amorphous In-Zn-O Transparent Conductors,

ADVANCED FUNCTIONAL MATERIALS, Issue 20 2008
Matthew P. Taylor
Abstract Transparent conducting oxides (TCOs) are increasingly critical components in photovoltaic cells, low-e windows, flat panel displays, electrochromic devices, and flexible electronics. The conventional TCOs, such as Sn-doped In2O3, are crystalline single phase materials. Here, we report on In-Zn-O (IZO), a compositionally tunable amorphous TCO with some significantly improved properties. Compositionally graded thin film samples were deposited by co-sputtering from separate In2O3 and ZnO targets onto glass substrates at 100,°C. For the metals composition range of 55,84 cation% indium, the as-deposited IZO thin films are amorphous, smooth (RRMS,<,0.4,nm), conductive (,,,,3000,,,1,·,cm,1), and transparent in the visible (TVis,>,90%). Furthermore, the amorphous IZO thin films demonstrate remarkable functional and structural stability with respect to heating up to 600,°C in either air or argon. Hence, though not completely understood at present, these amorphous materials constitute a new class of fundamentally interesting and technologically important high performance transparent conductors. [source]