Results 151 to 160 of about 513,211 (198)
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Crystal Morphology and Crystal Symmetry
2003Crystallography grew up empirically as a branch of mineralogy. It was supported by laws deduced from observations, such as the law of constancy of interfacial angles and the law of rational intercepts, and involved mainly the recognition, description, and classification of naturally occurring crystal species, that is, it was a study of the morphology ...
Mark Ladd, Rex Palmer
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Crystallization and Morphology
1989The crystalline high polymers represent a class of materials which, in the solid state, exhibit a complex hierarchical morphology in which structural ordering occurs over a wide range of dimensional levels. These range from spacings of the order of angstroms between neighbouring chains within a crystal lattice through the tens of nanometres to microns ...
Alun S. Vaughan, David C. Bassett
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Morphology of melt-crystallized syndiotactic polypropylene
Journal of Electron Microscopy, 2002A transmission electron microscopy (TEM) study was made to investigate the mechanism of isothermal crystallization from melt for syndiotactic polypropylene (sPP) with a syndiotactic pentad fraction of 0.92. The TEM morphologies of RuO4-stained and ultrathin-sectioned specimens revealed a clear assignment of lamellar crystals with different crystal ...
Jun-ichi, Harasawa +3 more
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Morphologies of CVD ZrC Crystals
Physica Status Solidi (a), 1981Particulate ZrC crystals of well-defined morphologies are formed by chemical vapor deposition from the ZrBr4–CH4–H2–Ar system. The basic forms are considered to be the prisms of 〈110〉axis having rhombic, pseudo-rhombic, and trigonal cross sections, which are bounded with four {111}, two {111} and two {110}, and two {111} and one {100} side faces ...
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Nucleation and Morphology of Chymotrypsinogen Crystals
Nature, 1964IT has been suggested recently1 that the morphology of enzyme crystals grown from solutions at various super-saturations2 may be interpreted in terms of the basic mechanisms of nucleation. Little is known of either the nucleation mechanism or the solid-state properties of enzymes, since most are notoriously unstable even under mild conditions. The work
J A, HAMILTON, J A, KOUTSKY, A G, WALTON
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Template‐Directed Control of Crystal Morphologies
Macromolecular Bioscience, 2007AbstractBiominerals are characterised by unique morphologies, and it is a long‐term synthetic goal to reproduce these synthetically. We here apply a range of templating routes to investigate whether a fascinating category of biominerals, the single crystals with complex forms, can be produced using simple synthetic methods.
Meldrum, Fiona C., Ludwigs, Sabine
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Screening-controlled morphologies of Yukawa crystals
The Journal of Chemical Physics, 2010Asymptotic expressions for the energies of Yukawa crystals, valid at the Coulomb and hard-sphere (i.e., the weak-screening and strong-screening) limits, are derived. Careful analysis of these limits elucidates the origin of the observed structural transitions that interconnect distinct particle configurations.
Jerzy, Cioslowski, Ewa, Grzebielucha
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Morphological equilibration of a facetted crystal
Physical Review B, 1992We study the morphological equilibration of a finite, facetted crystal by use of phenomenological equations of motion. The relevant atomistic kinetic processes (edge transfer, kink attachment and/or detachment, terrace hopping, and surface diffusion) are introduced progressively with special attention given to a proper treatment of the latter.
, Ozdemir, , Zangwill
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Designer Crystals: Single Crystals with Complex Morphologies
Chemistry of Materials, 2007Biological systems are capable of remarkable control over crystal growth, producing morphologically complex single crystals with curved surfaces. We have previously demonstrated that crystals with identical morphological complexities can be produced synthetically using templating routes. This article provides a detailed investigation into the mechanism
Wucher, B, Yue, W, Kulak, A, Meldrum, FC
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Dehydration of nigeran crystals: Crystal structure and morphological aspects
Journal of Molecular Biology, 1979Abstract The crystal structure of anhydrous nigeran, poly[(1 → 3)-α- d -maltose], obtained from Penicillium crustosum has been determined by a combined electron diffraction. X-ray diffraction and packing analysis. The electron diffraction pattern from solution-grown single crystals shows some (h k I) reflections in the baseplane pattern.
Perez, S. +3 more
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