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Title: New theory for competing interactions and microstructures in partially-ordered (liquid-crystalline) phases

Abstract

A summary of results from a unique statistical-physics theory to predict and explain competing interactions and resulting microstructures in some partially-ordered (in this case, liquid-crystalline (LC)) phases is presented. The static aspects of both partial orientational and partial positional ordering of the molecules into various microstructures in these phases (including the incommensurate smectic-Ad phase) can be understood in terms of various competing interactions (both entropic and energetic) involved in the packing together of the different molecular sub-units at given pressures and temperatures. These microstructures are predicted and explained (using no ad hoc or arbitrarily adjustable parameter) as a function of molecule chemical structure (including lengths and shapes (from bond lengths and angles), intramolecular rotations, site-site polarizabilities and pair potentials, dipole moments, etc). Theoretical results are presented for the nematic, re-entrant nematic, smectic-Ad, and smectic-Al LC phases and the isotropic phase.

Authors:
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
OSTI Identifier:
6010887
Report Number(s):
LA-UR-87-2618; CONF-8705168-4
ON: DE87014739
DOE Contract Number:  
W-7405-ENG-36
Resource Type:
Conference
Resource Relation:
Conference: Workshop on competing interactions and microstructures: statics and dynamics, Los Alamos, NM, USA, 5 May 1987; Other Information: Portions of this document are illegible in microfiche products
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE; LIQUID CRYSTALS; MICROSTRUCTURE; PHASE TRANSFORMATIONS; CRYSTAL LATTICES; FLEXIBILITY; LENNARD-JONES POTENTIAL; PRESSURE EFFECTS; CRYSTAL STRUCTURE; CRYSTALS; FLUIDS; LIQUIDS; MECHANICAL PROPERTIES; POTENTIALS; TENSILE PROPERTIES; 656002* - Condensed Matter Physics- General Techniques in Condensed Matter- (1987-); 360602 - Other Materials- Structure & Phase Studies

Citation Formats

Dowell, F. New theory for competing interactions and microstructures in partially-ordered (liquid-crystalline) phases. United States: N. p., 1987. Web.
Dowell, F. New theory for competing interactions and microstructures in partially-ordered (liquid-crystalline) phases. United States.
Dowell, F. 1987. "New theory for competing interactions and microstructures in partially-ordered (liquid-crystalline) phases". United States. https://www.osti.gov/servlets/purl/6010887.
@article{osti_6010887,
title = {New theory for competing interactions and microstructures in partially-ordered (liquid-crystalline) phases},
author = {Dowell, F},
abstractNote = {A summary of results from a unique statistical-physics theory to predict and explain competing interactions and resulting microstructures in some partially-ordered (in this case, liquid-crystalline (LC)) phases is presented. The static aspects of both partial orientational and partial positional ordering of the molecules into various microstructures in these phases (including the incommensurate smectic-Ad phase) can be understood in terms of various competing interactions (both entropic and energetic) involved in the packing together of the different molecular sub-units at given pressures and temperatures. These microstructures are predicted and explained (using no ad hoc or arbitrarily adjustable parameter) as a function of molecule chemical structure (including lengths and shapes (from bond lengths and angles), intramolecular rotations, site-site polarizabilities and pair potentials, dipole moments, etc). Theoretical results are presented for the nematic, re-entrant nematic, smectic-Ad, and smectic-Al LC phases and the isotropic phase.},
doi = {},
url = {https://www.osti.gov/biblio/6010887}, journal = {},
number = ,
volume = ,
place = {United States},
year = {1987},
month = {1}
}

Conference:
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