Document Detail


Optical and electron microscopy studies of Schiller layer formation and structure.
MedLine Citation:
PMID:  19144358     Owner:  NLM     Status:  PubMed-not-MEDLINE    
Abstract/OtherAbstract:
Iridescent Schiller layers were prepared by centrifugation of beta-FeOOH sols with an initial particle concentration of 10(14) particles/mL, reducing the Schiller layer formation time from over 2 months to 3 weeks. The formation and structure of the Schiller layers were investigated using optical and transmission electron microscopy. Microscopy studies revealed the self-assembly to proceed by the formation of two-dimensional particle arrays followed by the stacking of these arrays to form the final iridescent state. Varying the pH showed that Schiller layer formation occurs only in the pH range 1.4-2.0, indicating that electrostatic interactions play a pivotal role in the self-assembly. Decreasing the particle concentration of the sols was found to inhibit the assembly. DLVO theory and order-disorder phase transition models were found to be insufficient to accurately model the experimental behavior. Several approaches were investigated in an attempt to make ferrimagnetic arrays from the Schiller layers. The most promising was via electron beam irradiation, which transforms the beta-FeOOH into gamma-Fe(2)O(3) without altering the shape of the nanorods.
Authors:
Dorothy Farrell; Cindi L Dennis; JitKang Lim; Sara A Majetich
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Publication Detail:
Type:  Journal Article     Date:  2009-01-13
Journal Detail:
Title:  Journal of colloid and interface science     Volume:  331     ISSN:  1095-7103     ISO Abbreviation:  J Colloid Interface Sci     Publication Date:  2009 Mar 
Date Detail:
Created Date:  2009-01-26     Completed Date:  2009-03-27     Revised Date:  2009-11-11    
Medline Journal Info:
Nlm Unique ID:  0043125     Medline TA:  J Colloid Interface Sci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  394-400     Citation Subset:  -    
Affiliation:
Department of Physics, Carnegie Mellon University, 5000 Forbes Avenue, Pittsburgh, PA 15213-3890, USA.
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