Polymorphic Transitions
نویسندگان
چکیده
منابع مشابه
Model for polymorphic transitions in bacterial flagella.
Many bacteria use rotating helical flagellar filaments to swim. The filaments undergo polymorphic transformations in which the helical pitch and radius change abruptly. These transformations arise in response to mechanical loading, changes in solution temperature and ionic strength, and point substitutions in the amino acid sequence of the protein subunits that make up the filament. To explain ...
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The effects of pressure on the crystal structure of the three known polymorphs of magnesium sulfate (α-MgSO4, β-MgSO4, and γ-MgSO4) have been theoretically studied by means of density-functional theory calculations up to 45 GPa. We determined that under ambient conditions γ-MgSO4 is an unstable polymorph, which decomposes into MgO + SO3, and that the response of the other two polymorphs to hydr...
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Polymorphism is one of the most important issues raised by the industrial crystallization of Active Pharmaceutical Ingredients (API). The dynamic modelling of polymorphic transformations is developed using Femlab, a multiphysics simulation software, which is applied to the resolution of the Populations Balance Equations (PBE) involved. The stable and metastable distinct populations of crystals ...
متن کاملPolymorphic transitions of diborane at sub- and near-megabar pressures
Recent theoretical investigations of high-pressure structures of diborane have yielded many intriguing predictions which have so far remained untested due to challenges of acquiring experimental data at extreme pressures. Here we report new pressure-induced polymorphic transformations of crystalline diborane observed between 36 and 88 GPa by in situ Raman spectroscopy and interpreted using elec...
متن کاملCombined synchrotron XRD/Raman measurements: in situ identification of polymorphic transitions during crystallization processes.
A combination of two analytical methods, time-resolved X-ray diffraction (XRD) and Raman spectroscopy, is presented as a novel tool for crystallization studies. An acoustic levitator was employed as sample environment. This setup enables the acquisition of XRD and Raman data in situ simultaneously within a 20 s period and hence permits investigation of polymorphic phase transitions during the c...
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ژورنال
عنوان ژورنال: Journal of the Mineralogical Society of Japan
سال: 1967
ISSN: 1883-7018,0454-1146
DOI: 10.2465/gkk1952.8.special1_34