Light Scattering Studies on Thin Liquid Films PDF Download
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Author: J. G. H. Joosten
Publisher:
ISBN:
Category :
Languages : en
Pages : 208
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Book Description
Author: J. G. H. Joosten
Publisher:
ISBN:
Category :
Languages : en
Pages : 208
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Book Description
Author: Wilhelmus Aloisius Barbara Donners
Publisher:
ISBN:
Category :
Languages : en
Pages : 94
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Author: Ivan Ivanov
Publisher: Taylor & Francis
ISBN: 1351408194
Category : Science
Languages : en
Pages : 1152
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Book Description
This comprehensive reference provided a systematic examination of both the theory and applications of thin liquid films - giving a critical review of major concepts and unresolved or controversial problems, as well as revealing experimental methods. It includes results previously unpublished. Combining the work of 20 leading researchers, Thin Liquid Films furnishes a fundamental overview of thermodynamics of thin liquid films. Generously illustrated with equations, tables and drawling and containing more than 2,200 citations to pertinent literature, this is an authoritative reference for physical, surface, and colloid chemists, biophysicists and physicists; chemical engineers and advanced graduate students in chemistry, chemical engineering, biophysics and physics.
Author: Ivan Ivanov
Publisher: Taylor & Francis
ISBN: 1351408208
Category : Science
Languages : en
Pages : 1141
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Book Description
This comprehensive reference provided a systematic examination of both the theory and applications of thin liquid films - giving a critical review of major concepts and unresolved or controversial problems, as well as revealing experimental methods. It includes results previously unpublished. Combining the work of 20 leading researchers, Thin Liquid Films furnishes a fundamental overview of thermodynamics of thin liquid films. Generously illustrated with equations, tables and drawling and containing more than 2,200 citations to pertinent literature, this is an authoritative reference for physical, surface, and colloid chemists, biophysicists and physicists; chemical engineers and advanced graduate students in chemistry, chemical engineering, biophysics and physics.
Author: Charles Y. Young
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Charles Steven Rosenblatt
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Elliot Golias
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
We describe the construction of a light scattering apparatus that is first used to conduct optical reflectivity measurements in thin smectic-A liquid crystal films to measure the thickness of films. Furthermore, we continue by conducting dynamic light scattering studies of films to obtain surface tension measurements for 8CB.
Author: Anil Raj Duggal
Publisher:
ISBN:
Category :
Languages : en
Pages : 185
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Author: Peter Rupert Thomas Pugh
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Sunil K. Sharma
Publisher:
ISBN:
Category : Fluctuations (Physics)
Languages : en
Pages : 157
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Book Description
Smectic liquid crystalline films or membranes have been widely studied by using the hydrodynamic theory and dynamical scattering methods, but most studies have been confined to either frequency domain light scattering measurements above ~1GHz, which probe sound waves in a limit where damping is a weak effect, or by low frequency photon correlation spectroscopy, performed in the time domain below 10 MHz (i.e., for times) and usually designed to study overdamped fluctuations of the smectic layer orientation when inertia is negligible. The interesting crossover regime, where inertia, damping, and elastic forces all contribute significantly in the hydrodynamic description, has posed a long standing challenge to scattering experiments. In this dissertation we present an extension of the optical photon correlation spectroscopy (PCS) technique down to ~100 picosecond resolution that fully closes the historical gap between frequency and time domain scattering techniques. We study smectic films from which we can determine, for optical wavevectors 10^4-10^5/cm, both the propagation frequency and damping rate for undulatory motion of thin free standing smectic films (a few tens of molecular layers), as well as the relaxation rates associated with overdamped layer dynamics of bulk films (thousands of layers thick), by measuring the time correlation function of the intensity of light scattered from thermal motion of the film surfaces. We find that the standard hydrodynamic model for incompressible, isothermal smectic films provides a good overall framework for quantitative analysis of our correlation data in both under and overdamped regimes for films of common cyanobiphenyl liquid crystals in the SmA phase. In particular, the main elastic properties - the film surface tension and compression elastic constant - are found to be reasonably consistent with values obtained from other, more invasive techniques. However, there are significant aspects in which the standard model appears incomplete. First, in relatively thin films where the dominant scattering comes from nearly pure undulation modes of the film, the effective layer sliding viscosity is more than an order of magnitude less than values reported in bulk samples, typically measured between substrates. On the other hand, in a very thick film, we obtain a result, from purely overdamped dynamics, which basically agrees with quoted bulk values of the layer viscosity. Second, in thinner films, we detect an additional, overdamped mode not expected in the light scattering derived from the standard hydrodynamic theory. We propose that this mode is associated with consequences of a higher degree of order on the film surfaces. We have also carried out preliminary surface light scattering experiments on layer motion in thin smectic-C and hexatic-B films. The dynamical parameters obtained from fits to these data show only modest variations through the SmA-SmC and SmA-HexB transitions. The additional, overdamped mode is revealed to be clearly hydrodynamic (relaxation rate ~ square of wavevector) over the range probed.
