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Showing 1 to 20 of 113 for “"Crystal lattice"”.
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Quantitative analysis of crystal lattice and defects in nanoscale functional materials by electron diffraction
Crystalline defects are critical to the properties of the material in both desired and undesired ways. In nanoscale functional materials, a small number of defects can change the material performance significantly. Transmission electron microscopy (TEM) has been one of best techniques to study …
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The importance of crystal lattice structure of cellulose in the production and action of cellulase
… Trichoderma viride enzymes capable of degrading crystalline forms of cellulose were studied. The four stable crystal forms (I, II, IV and II/IV) were used in the growth medium, both before and after the removal of the amorphous material. Various enzyme preparations capable of solubilizing …
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X-Ray Generation by Mev Electrons in Silicon: Temperature, Tilt and Thickness Dependence
When relativistic electrons strike a single crystal target, sharp peaks are observed in the x-ray spectrum generated. One type of radiation, called coherent bremsstrahlung, results from coherent electron scattering by atoms arranged on the crystal lattice. The other type of radiation is channeling …
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Application of the Coupled Dipole Method for Predicting Swelling and Exfoliation Behavior of Layered Inorganic Materials
… CDM is applied to compute the vdW interaction of crystal lattice sheets of muscovite mica and compared with the results of the Hamaker method. Due to the complexity of the crystal lattice, we coarse-grained the crystal lattice in various ways and studied the effect on vdW interaction energy. Our …
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Charged-defect transport induced stress in mixed ionic-electronic conducting ceramic membranes
… of atomic-scale strain and distortion within the crystal lattice structure associated with changes in the local stoichiometry of the crystal lattice. This research is generally concerned with strontium-doped lanthanum cobaltites and ferrites (LSCF). The material is a mixed ionic and electronic …
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Resonant Raman scattering studies of III-V semiconductor microstructures
… explores III-V semiconductors by conveying crystal lattice structural information and by probing carrier dynamics both directly and via the electron-phonon interaction. We have examined three physical systems accentuating three aspects of Raman utility. Al$\sb{\rm x}$Ga$\sb{\rm 1-x}$As alloy …
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Multiscale phase-field approach to martensitic phase transformations that satisfies lattice instability conditions
… are developed at nanoscale that satisfies crystal lattice instability conditions obtained by atomistic simulations. Theory includes a fully geometrically nonlinear formulation for the general case of finite elastic and transformational strains as well as anisotropic and different elastic …
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Improving the solubility and dissolution of poorly soluble drugs by salt formation and the consequent effect on mechanical properties
… and cyclohexylamine counterions produced crystalline, stable salts but did not improve solubility and dissolution significantly compared to the parent compound. The substitution of hydroxyl groups to tert-butylamine counterions produced an increase in solubility and dissolution. AMP2 …
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Determination of Recoil-Free Fractions From 151Eu Mossbauer Spectra of EuBO3
… If the emitting nucleus is not bound in a crystal lattice, some of the transition energy, or the difference in energy of the two nuclear levels, may be imparted to the nucleus as it recoils, much as a gun acquires energy in recoiling after firing a bullet. This energy is termed the recoil …
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Structure/reactivity Study of Methanol Fuel Cell Catalysts: NMR, FTIR, and Electrochemistry
… of the catalyst surface, alterations of the Pt crystal lattice were attempted to preferentially form Pt(111) facets.
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Part I. Spin-state isomerism in crystalline (trifluoromethanesulfonato)(meso-tetraphenylporphinato)iron(III). Part II. Toward refined model compounds for the cytochrome c oxidase active site: A new picket-fence porphyrin with short imidazole pickets
… has been structurally characterized by single-crystal X-ray diffraction in a monoclinic phase at 293 K and in a triclinic phase at 293, 188 and 103 K. While only one type of molecular site is found in the monoclinic phase, the temperature-dependent structural parameters and magnetic …
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Impurity-coformer cocrystals and/or complexes and their use in separations
… in those that produce highly regulated products. Crystallization is commonly used as a purification technique in many industries, but can have two drawbacks: the first is the reduced selectivity when a structurally similar impurity is incorporated into the crystal lattice of the target being …
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Magnetic studies of epitaxial neodymium
… in one of two orientations: some with the crystallographic c axis perpendicular to the film and some with the crystallographic b axis perpendicular to the film. The films exhibit unexpected structural and magnetic properties. The crystal structures agree with lattice types known to be …
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Influence of applied uniaxial stress upon the ultraviolet absorption bands in KBr and KI
… of imperfections occurring in the alkali halide crystal lattice has been investigated. The imperfections are the interstitial atom, the interstitial ion, and the negative ion vacancy. The interstitial atom, or H center, is a paraelastic defect which assumes a preferential crystal orientation in …
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Optomechanical anisotropy in nanoengineered polymer photonic crystals
Symmetry in photonic crystals is reflected in the structure of their photonic bands and symmetry breaking can result in the development of complete photonic band gaps, leading to enhanced optical properties. This can be difficult for self-assembled nanostructures, due to their restriction by …
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Olfactory-related receptors : methods towards enabling structural and functional studies
… First, milligrams of protein are needed for crystallization screens, but most are expressed at low levels endogenously or in heterologous expression systems. Second, detergents capable of solubilizing and stabilizing these proteins in aqueous solution must be found. Third, the flexible nature …
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Magnetoresistance and Thermoelectricity in Quasi-Low Dimensional Semimetals
… field and the anisotropic ionic potential of the crystal lattice. Detailed information of the underlying physics of such systems can be probed by the macroscopic responses observed in electric and thermoelectric transport experiments. In this thesis we present a com- prehensive study of the …
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Microstructural Investigations of the Layered Cathode Materials LiCoO2 and LiNi1/3Mn1/3Co1/3O2
… by electron diffraction. Single and polycrystalline crystals are found in this material. The partial substitution of Co by Ni and Mn in LiNi1/3Mn1/3Co1/3O2 opens up the possibility of different cation configurations in the crystal lattice. Both 3Rm symmetry and superlattices are …
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ΜΕΛΕΤΗ ΚΑΤΑΝΟΜΗΣ ΚΑΙ ΕΠΑΝΑΔΙΑΛΥΣΗΣ ΒΑΡΕΩΝ ΜΕΤΑΛΛΩΝ ΣΕ ΝΕΡΑ ΚΑΙ ΙΖΗΜΑΤΑ ΠΟΤΑΜΩΝ ΤΗΣ ΒΟΡΕΙΑΣ ΕΛΛΑΔΑΣ
… FE-MN OXIDES, ORGANIC MATTER-SULPHIDER AND CRYSTAL LATTICE. THE VERTICAL DISTRIBUTION OF HEAVYMETALS IN RIVER SEDIMENTS OF 30CM LENGTH WAS EXAMINED AS WELL AS THE PARTITIONING INTO DIFFERENT GRAIN SIZE SEDIMENT FRACTIONS (20,40,63,100-200MM). THE DISTRIBUTION OF HEAVY METALS IN FILTERED …
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Colloidal Cerium Oxide Nanoparticle: Synthesis and Characterization Techniques
… spectra are collected on cerium oxide nanocrystalline particles. While CeO2 is the stable form of bulk cerium oxide, ceria nanoparticles exhibit a nonstoichiometric composition, CeO2-γ, due to the presence of oxygen vacancies and the formation of Ce2O3 at the grain boundaries. The Ce(III) …
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