Diffraction analysis

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  • Now neutron diffraction is widely applied for the research of crystal, magnetic structure and internal stress of crystalline materials of various classes, including nanocrystalls. In the present book, we make practically short excursion to modern state of neutron diffraction researches of crystal materials of various classes.

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  • X-ray diffraction is a tool for the investigation of the fine structure of matter. This technique had its beginnings in von Laue's discovery in 1912 that crystals diffract x-rays, the manner of the diffraction revealing the structure of the crystal. At first, x-ray diffraction was used only for the determination of crystal structure.

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  • The crystal structure of the dimericO-acetylserine sulfhydrylase isozyme B from Escherichia coli(CysM), complexed with the substrate analog citrate, has been determined at 1.33 A˚ resolution by X-ray diffraction analysis. The C1-carboxylate of citrate was bound at the carboxylate position of O-acetylserine, whereas the C6-carboxylate adopted two conformations.

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  • The Oracle Change Management Pack enables database administrators to make complex changes to schema objects safely, track changes to schemas and databases over time, make copies of schemas or objects, and compare and synchronize schemas and databases. With Oracle Change Management, you can also propagate object definitions to one or more sites, clone schema objects with a subset of the data, and plan schema changes over the life of the database and its applications.

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  • Lithium fluoride (LiF) thermoluminescent powder doped with Mg, Cu, Na, and Si as activators was prepared. X-ray diffraction analysis indicated that doping LiF with different activators makes crystal lattice somewhat expand. The dosimetric properties of the powder were studied. The main dosimetric peak of LiF:Mg,Cu,Na,Si appeared in the range of 227−247o C and the ratio of the height of the main peak to that of the other small peaks in the LiF:Mg,Cu,Na,Si is much greater than that in the LiF:Mg,Ti and LiF:Mg,Cu,P. ...

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  • The crystal structure of the complex between human immunodeficiency virus type 1 (HIV-1) protease and a peptidomimetic inhibitor of ethyleneamine type has been refined toRfactor of 0.178 with diffraction limit 2.5 A ˚ .The peptidomimetic inhibitor Boc-Phe-Y[CH2CH2 NH]-Phe-Glu-Phe-NH2 (denoted here as OE) contains the ethylene-amine replacement of the scissilepeptidebond.

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  • Starting with oligopeptide sequences and using PCR, the gene of the cyclodextrinase fromFlavobacteriumsp. no. 92 wasderivedfrom thegenomicDNA.Thegenewas sequenced and expressed inEscherichia coli; the gene pro-duct was purified and crystallized. An X-ray diffraction analysis using seleno-methionines with multiwavelength anomalous diffraction techniques yielded the refined 3D structure at 2.1 A ˚ resolution.

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  • High-resolution X-ray diffraction structures of integral membrane proteins have revealed various binding modes of lipids, but current spectroscopic studies still use uniform macroscopic binding constants to describe lipid binding. The Adair approach employing microscopic lipid-binding con-stants has previously been taken to explain the enhancement of agonist binding to the nicotinic acetylcholine receptor by general anaesthetics in terms of the competitive displacement of essential lipid activator molecules [Walcher S, Altschuh J & Sandermann H (2001) J. Biol. Chem. 276, 42191–42195]....

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  • Using synchrotron X-ray diffraction the thermal behaviour was studied of the cubic phases in the 1-monooleoyl-rac-glycerol (MO)/n-octyl-b-D-glucopyranoside (OG)/ 2 H2O system with 58 or 45 wt % MO concentration and varying OG/ 2 H2O contents. These MO contents correspond to a Pn3mcubic single-phase or aPn3mcubic phase in excess water on the binary MO/water axis of the ternary phase diagram. The cubic liquid crystalline phases are stable with small fractions of OG, while higher OG concentrations trigger a cubic-to-lamellar phase transition. ...

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  • Experimental Determinations of Surface Structure Low-Energy Electron Diffraction • High-Resolution Electron Microscopy • Field Ion Microscopy Chemical Analysis of Surfaces Auger Electron Spectroscopy • X-Ray Photoelectron Spectroscopy • Secondary Ion Mass Spectroscopy • Infrared Spectroscopy • Thermal Desorption

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  • The aim of the study was to investigate the crystallization kinetics and solidification behaviour of Fe60Co8Mo5Zr10W2B15 bulk glass forming alloy. The solidification behaviour in near-equilibrium and non-equilibrium cooling conditions was studied. The eutectic and peritectic reactions were found to exist in the solidification sequence of the alloy. The bulk metallic glass formation was achieved by using two methods: quenching from the liquid state and quenching from the semi-state.

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  • Ferrante, J. et. al. “Surface Physics in Tribology” Handbook of Micro/Nanotribology. Ed. Bharat Bhushan Boca Raton: CRC Press LLC, 1999 © 1999 by CRC Press LLC Surface Physics in Tribology John Ferrante and Phillip B. Abel 3.1 3.2 3.3 3.4 3.

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  • Wang et al. Nanoscale Research Letters 2011, 6:241 http://www.nanoscalereslett.com/content/6/1/241 NANO EXPRESS Open Access High-quality reduced graphene oxidenanocrystalline platinum hybrid materials prepared by simultaneous co-reduction of graphene oxide and chloroplatinic acid Yinjie Wang, Jincheng Liu*, Lei Liu, Darren Delai Sun* Abstract Reduced graphene oxide-nanocrystalline platinum (RGO-Pt) hybrid materials were synthesized by simultaneous coreduction of graphene oxide (GO) and chloroplatinic acid with sodium citrate in water at 80°C, of pH 7 and 10.

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  • It was the first time that zeolite NaY with the SiO2/Al2O3 ratio of 3.8 was synthesized from phlogopite taken in Yen Bai of Vietnam in the presence of organic complex, NaOH and liquid glass. Synthesized samples were characterized by X-ray diffraction (XRD), Infrared lattice vibration (IR), scanning electron microscopy (SEM), differential thermal analysis (DTA), thermogravimetric analysis (TGA) and Surface area by BET technique. The obtained results showed that the synthesized samples were well crystallized.

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  • La0.9Ce0.1Mn0.5Cu0.5O3 was prepared by the combustion method using polyvinyl alcohol (PVA) and corresponding metal nitrates. Samples were characterized by thermogravimetric and differential thermal analysis (TG-DTA), X-ray diffraction (XRD), FT-IR spectra, transmission electron microscopy (TEM) and BET (Brunaure-Emmet-Teller) measurements. The results show that perovskite phase is formed at 600o C. Sample synthesized under optimal condition has nanostructure with large specific area.

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  • LaMn0.5Cu0.5O3 was synthesized as nanoparticles with relatively high surface area (19 m2/g) at low temperature (600o C) from gel precursor prepared by using polyvinyl alcohol (PVA) and corresponding metal nitrates. Influence of pH, PVA/metals mole ratio and temperature of gel formation on the crystallization of perovskites was studied. Samples were characterized by X-ray diffraction (XRD), thermogravimetric and differential thermal analysis (TG-DTA), transmission electron microscopy (TEM) and BET (Brunaure-Emmet-Teller) measurements.

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