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Theory thermal microscopy

Crystallization conditions can often be manipulated to favor the nucleation of alternate crystal forms. A metastable polymorph of metformin hydrochloride has been isolated using capillary crystallization techniques, and subsequently studied using thermal microscopy [24]. Calculations based on classical nucleation theory indicated that a metastable form could be obtained using high degrees of... [Pg.266]

The objective of this chapter is to present to the reader the many facets of thermal microscopy. Information on the following topics will be presented the evolution of the technique, background theory, the role of thermal microscopy as a complementary technique, general experimental parameters, industrial applications, references, and vendor directories. [Pg.222]

The identification of the superconducting phase YBagCug-O7 g provides an example in which knowledge of thermodynamics, i.e. the Gibbs phase rule and the theory of equilibrium phase diagrams coupled with X-ray diffraction techniques led to success. Further, the use of databases that can now be easily accessed and searched on-line provided leads to a preliminary structure determination. The procedures outlined here are among the basic approaches used in solid state chemistry research, but by no means are they the only ones. Clearly the results from other analytical techniques such as electron microscopy and diffraction, thermal... [Pg.482]

Tompkins (1978) concentrates on the fundamental and experimental aspects of the chemisorption of gases on metals. The book covers techniques for the preparation and maintenance of clean metal surfaces, the basic principles of the adsorption process, thermal accommodation and molecular beam scattering, desorption phenomena, adsorption isotherms, heats of chemisorption, thermodynamics of chemisorption, statistical thermodynamics of adsorption, electronic theory of metals, electronic theory of metal surfaces, perturbation of surface electronic properties by chemisorption, low energy electron diffraction (LEED), infra-red spectroscopy of chemisorbed molecules, field emmission microscopy, field ion microscopy, mobility of species, electron impact auger spectroscopy. X-ray and ultra-violet photoelectron spectroscopy, ion neutralization spectroscopy, electron energy loss spectroscopy, appearance potential spectroscopy, electronic properties of adsorbed layers. [Pg.281]

It has been shown that the peak positions of the Raman-active bands of carbon fibres are strain-sensitive and that Raman Microscopy can be used to follow the deformation of carbon fibres both in air and in a thermoplastic PEEK matrix. It has been demonstrated that the fibres near the surface in the carbon-fibre/PEEK composite examined are subject to a residual compressive strain of the order of 0.287o which is of the same order as that expected (19) from matrix shrinkage due to crystallisation and thermal contraction on cooling from the processing temperature. It is found that when the composite is subject to an externally-applied tensile deformation then, as expected, the change in fibre strain is similar to the applied strain as expected from simple composite theory. [Pg.247]


See other pages where Theory thermal microscopy is mentioned: [Pg.315]    [Pg.182]    [Pg.24]    [Pg.67]    [Pg.261]    [Pg.57]    [Pg.205]    [Pg.52]    [Pg.286]    [Pg.324]    [Pg.261]    [Pg.82]    [Pg.261]    [Pg.52]    [Pg.174]    [Pg.196]    [Pg.485]    [Pg.388]    [Pg.480]    [Pg.69]    [Pg.603]    [Pg.768]    [Pg.643]    [Pg.1728]    [Pg.7392]    [Pg.65]    [Pg.94]    [Pg.688]    [Pg.4]    [Pg.72]    [Pg.1507]   
See also in sourсe #XX -- [ Pg.225 , Pg.226 , Pg.227 ]




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Microscopy, thermal

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