We study the effect of polarized laser annealing on the crystalline structure of individual crystalline-amorphous core-shell silicon nanowires (NWs) using Raman spectroscopy. The crystalline fraction of the annealed spot increases dramatically from 0 to 0.93 with increasing incident laser power. We observe Raman lineshape narrowing and frequency hardening upon laser annealing due to the growth ...

Ipidacrine hydrochloride is pharmaceutically active compound that forms variety of crystalline modifications which differs by solvent type and content in crystalline structure. These crystalline forms analyzed by powder x-ray diffraction, differential thermal analysis, thermogravimetry and Karl Fisher titration. Obtained crystalline forms include two monohydrates, two hemihydrates, two anhydrou...

X-ray absorption ne structure (XAFS) measurements of mixed salts Rb x K 1?x Br and RbBr y Cl 1?y at their congruent melting points compositions reveal that their actual structure buckles about the NaCl average structure with an rms angular deviation from collinearity of 7-9. XAFS measures the buckling directly through three body correlations, and veriies the homogene-ity and randomness of the m...

THREE-DIMENSIONAL STRUCTURES OF S-LAYERS 1. Classification of S-layers According to Symmetry 2. Hexagonal S-layers (a) Sulfolobus acidocaldarius (b) Thermoproteus tenax (c) Synechocystis sp. CLII (d) Eubacterium sp. AHN 990 (e) Clostridium thermohydrosulfuricum (f) Deinococcus radiodurans (g) Aquaspirillum serpens (h) Acetooenium kivui (i) Bacteroides buccae 3. Tetragonal S-layers (a) Bacillus ...

Crystalline sheets of Acanthamoeba actin induced by the trivalent lanthanide gadolinium exist in three different polymorphic forms, which show different striation patterns and surface topographies. We have called these different forms "rectangular" and "square" sheets, and "cylinders" and have shown that each of the three forms is constructed from common "basic" lattices associated in different...

In the present thesis we implement a simple numerical method to solve a onedimensional time-independent Schrödinger equation in any arbitrary periodic potential. We apply this method to study the energy band structure, the Bloch wavefunctions and the 1D-density of states of a simple 1D-superlattice model. The results obtained for this model exhibit nontrivial features of real hetero-crystalline...

Morphological control of multimetallic nanostructures is crucial for obtaining shape-dependent physical and chemical properties. Up to date, control of the shapes of multimetallic nanostructures has remained largely empirical. Multimetallic nanostructures have been produced mostly through seed-mediated growth. Understanding the role played by starting nanocrystal seeds can help in controlling t...

We report the scalable growth of aligned graphene and hexagonal boron nitride on commercial copper foils, where each film originates from multiple nucleations yet exhibits a single orientation. Thorough characterization of our graphene reveals uniform crystallographic and electronic structures on length scales ranging from nanometers to tens of centimeters. As we demonstrate with artificial twi...

Negatively stained sarcoplasmic reticulum from the scallop Placopecten magellanicus presented a variety of crystalline forms, the most common being tubular structures. These were characterized by paired rows of morphological units, spaced at approximately 120 A, running diagonally across the tubules. The orthogonal unit cell (120 X 55 A) contained two units, related by a twofold axis, which pro...