Thermodynamic basis for dielectric relaxation in complex materials

1986 ◽  
Vol 33 (7) ◽  
pp. 4944-4951 ◽  
Author(s):  
L. F. del Castillo ◽  
L. S. García-Colín
Keyword(s):  
Dielectric Relaxation ◽  
Complex Materials ◽  
Thermodynamic Basis

Non-Debye dielectric relaxation in complex materials

2002 ◽  
Vol 284 (1-2) ◽  
pp. 139-168 ◽  
Author(s):  
Yuri Feldman ◽  
Alexander Puzenko ◽  
Yaroslav Ryabov
Keyword(s):  
Dielectric Relaxation ◽  
Complex Materials

Transmission electron microscope studies in special ceramics

1978 ◽  
Vol 36 (1) ◽  
pp. 268-269
Author(s):  
A. Zangvil ◽  
L.J. Gauckler ◽  
G. Schneider ◽  
M. Rühle
Keyword(s):  
Phase Diagrams ◽  
Crystal Structures ◽  
Thin Foil ◽  
Limited Extent ◽  
Complex Materials ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Electron Microscopes ◽  
Lattice Resolution

The use of high temperature special ceramics which are usually complex materials based on oxides, nitrides, carbides and borides of silicon and aluminum, is critically dependent on their thermomechanical and other physical properties. The investigations of the phase diagrams, crystal structures and microstructural features are essential for better understanding of the macro-properties. Phase diagrams and crystal structures have been studied mainly by X-ray diffraction (XRD). Transmission electron microscopy (TEM) has contributed to this field to a very limited extent; it has been used more extensively in the study of microstructure, phase transformations and lattice defects. Often only TEM can give solutions to numerous problems in the above fields, since the various phases exist in extremely fine grains and subgrain structures; single crystals of appreciable size are often not available. Examples with some of our experimental results from two multicomponent systems are presented here. The standard ion thinning technique was used for the preparation of thin foil samples, which were then investigated with JEOL 200A and Siemens ELMISKOP 102 (for the lattice resolution work) electron microscopes.

Dielectric Relaxation Studies of Silver Nanoparticles dispersed Liquid Crystal

2015 ◽  
Vol 8 (3) ◽  
pp. 2176-2188 ◽  
Author(s):  
Keisham Nanao Singh
Keyword(s):  
Activation Energy ◽  
Silver Nanoparticles ◽  
Liquid Crystal ◽  
Dielectric Relaxation ◽  
Relaxation Process ◽  
Relaxation Times ◽  
Low Frequency ◽  
Bulk Liquid ◽  
Molecular Rearrangement ◽  
Relaxation Studies

This article reports on the Dielectric Relaxation Studies of two Liquid Crystalline compounds - 7O.4 and 7O.6 - doped with dodecanethiol capped Silver Nanoparticles. The liquid crystal molecules are aligned homeotropically using CTAB. The low frequency relaxation process occurring above 1 MHz is fitted to Cole-Cole formula using the software Dielectric Spectra fit. The effect of the Silver Nanoparticles on the molecular dipole dynamics are discussed in terms of the fitted relaxation times, Cole-Cole distribution parameter and activation energy. The study indicate a local molecular rearrangement of the liquid crystal molecules without affecting the order of the bulk liquid crystal molecules but these local molecules surrounding the Silver Nanoparticles do not contribute to the relaxation process in the studied frequency range. The observed effect on activation energy suggests a change in interaction between the nanoparticles/liquid crystal molecules.

Professional risk in processing processes complex (review of literature)

2020 ◽  
pp. 29-37
Author(s):  
L. Mavrina ◽  
E. Shaikhlislamova ◽  
I. Khasanova ◽  
L. Karimova ◽  
N. Muldasheva ◽  
...  
Keyword(s):  
Working Conditions ◽  
Urgent Problem ◽  
Review Of Literature ◽  
Complex Materials ◽  
Work Analysis ◽  
Production Factors ◽  
Bibliographic Data ◽  
Industrial Injuries ◽  
The Impact ◽  
Safe Working

The relevance of the problem. Ensuring safe working conditions is currently an urgent problem of our time. Purpose of work. Analysis of bibliographic data on issues of occupational risk, industrial injuries among workers of the processing complex. Materials and methods. To achieve this goal, materials related to this topic were studied in the works of domestic and foreign scientists. Results. A lot of scientific works are devoted to the problem of assessing professional risk in the production of a processing complex. Modern research has proved that risk assessment is one of the main methods for analyzing the impact of various production factors on an employee. Conclusion Occupational morbidity and industrial injuries are a consequence of unsatisfactory conditions and labor protection in enterprises.

Dielectric Relaxation in Liquid Crystal Phases with Polar Order

2003 ◽  
Vol 297 (1) ◽  
pp. 91-105
Author(s):  
B. Żywucki ◽  
W. Kuczyński ◽  
J. Małecki
Keyword(s):  
Liquid Crystal ◽  
Dielectric Relaxation ◽  
Polar Order ◽  
Crystal Phases ◽  
Liquid Crystal Phases
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