Document Detail


Diminution of the ordering in plastic and liquid crystalline phases by confinement.
MedLine Citation:
PMID:  20469929     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
In a compound exhibiting plastic (crystal B) and liquid crystalline (smectic A) phases, we report calorimetric and X-ray features that are drastically affected by confinement and orientation in Anopore membranes. Data on the untreated membranes in which the molecules aligned parallel to the pore axes, show a significant diminution in the correlation length corresponding to the positional order of the plastic phase suggesting that finite size effects can perhaps transform the plastic phase to a hexatic one. In the orthogonal case, having the molecules in the plane of the membrane, a new phase is induced, whose structural possibilities are discussed. Calorimetric measurements corroborate these results and also bring out the different thermal behaviors, not only between the bulk and the confined cases, but also between the situations wherein the orientations of the molecules are different. These findings are expected to open up a new path to understand the melting phenomenon, especially that which occurs in lower dimensions.
Authors:
S Krishna Prasad; S Sridevi; D S Shankar Rao
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  The journal of physical chemistry. B     Volume:  114     ISSN:  1520-5207     ISO Abbreviation:  J Phys Chem B     Publication Date:  2010 Jun 
Date Detail:
Created Date:  2010-06-03     Completed Date:  2010-09-09     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101157530     Medline TA:  J Phys Chem B     Country:  United States    
Other Details:
Languages:  eng     Pagination:  7474-81     Citation Subset:  -    
Affiliation:
Centre for Liquid Crystal Research, Jalahalli, Bangalore 560013, India. skpras@gmail.com
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