A Light Scattering Study of Precursor Effects Near Phase Transitions in Liquid Crystals PDF Download
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Author: Amarante Johanna Böttger
Publisher:
ISBN:
Category :
Languages : en
Pages : 99
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Author: Amarante Johanna Böttger
Publisher:
ISBN:
Category :
Languages : en
Pages : 99
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Author: H.Z. Cummins
Publisher: Elsevier
ISBN: 0444599851
Category : Science
Languages : en
Pages : 685
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Book Description
Since the development of the laser in the early 1960's, light scattering has played an increasingly crucial role in the investigation of many types of phase transitions and the published work in this field is now widely dispersed in a large number of books and journals. A comprehensive overview of contemporary theoretical and experimental research in this field is presented here. The reviews are written by authors who have actively contributed to the developments that have taken place in both Eastern and Western countries.
Author: Elliot R. Bernstein
Publisher:
ISBN:
Category :
Languages : en
Pages : 13
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Book Description
A total of 16 papers have appeared in the literature dealing with both the theoretical and experimental (light scattering) investigation of phase transitions and critical phenomena in simple molecular solids. New Brillouin scattering data have been obtained for benzil single crystals near the phase transition at 83.5K. A mean field approach to the dynamics of structural phase transitions in molecular crystals has been developed. Brillouin scattering study of the successive phase transitions in methmmonium iron chloride. In addition to the magnetic transition at lwo temperature, this system also possesses successive structural phase transitions. These have been studied by means of lattice dynamics and far infrared spectroscopy, birefringenence, x-ray and neutron diffraction, specific heat and ultrasonic sound velocity measurements, and ultrasonic attentuation measurements. Also pursued were high pressure Raman, Brillouin, and Rayleigh scattering studies of benzene in a diamond anvil cell.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 32
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The research objectives of this grant are to (1) characterize phase transitions theoretically and experimentally in molecular crystal systems, (2) use the above understanding gained by light scattering studies and theoretical interpretation to apply to the more complex system of lyotropic liquid crystals, and (3) knowledge gained on the model systems of increasing complexity is then applied to polymer liquid crystals and solid polymers as observed by laser light scattering techniques. Objective one has been definitely achieved as can be seen from the number of papers written in the last few years. Systems to have been experimentally and theoretically discussed are: trioxane, triazine, benzil, and chloranil. Others still to be investigated are: biphenyl, urea, thiourea, and hexamethyl benzene. Studies of lyotropic liquid crystals (sodium decyl sulfate, sodium sulfate, decanol, water) have been progressed to the point at which we will be reporting this data shortly. The major findings are: a number of phase transitions occur between 20 and 60 C; these transitions evidence strong critical behavior and long correlation times for fluctuations; and liquid crystals can be studied by light scattering in a unique and meaningful manner. Finally, some polymer studies were started which will be continued into the coming contract period. Spectra of solid powders, ribbons, and liquid crystals of PBT and solid PBO were obtained.
Author: Y. Ishibashi
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Ralph Schaetzing
Publisher:
ISBN:
Category : Critical phenomena (Physics)
Languages : en
Pages : 446
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Author: Angela C. A. Maciel
Publisher:
ISBN:
Category : Crystallography
Languages : en
Pages : 262
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Author: Mikhail Mikhaĭlovich Sushchinskiĭ
Publisher: Nova Publishers
ISBN: 9780941743266
Category : Science
Languages : en
Pages : 260
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Book Description
Translation from the 1987 Russia edition. These proceedings address issues in solid state optics and physics: Raman scattering in crystals and dispersive media, Rayleigh and inelastic scattering with phase transitions, the features of ferroelectrics in connection with the general concept of soft mod
Author: Michal Jan P. Orkisz
Publisher:
ISBN:
Category : Light
Languages : en
Pages : 109
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Author: Hua Yang
Publisher:
ISBN:
Category :
Languages : en
Pages : 392
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