Document Detail

Fabrication of Large Two-dimensional Colloidal Crystals via Self-assembly in Attractive Force Gradient.
MedLine Citation:
PMID:  23311289     Owner:  NLM     Status:  Publisher    
Colloidal particles in water-lutidine (WL) binary liquid mixture experience temperature-dependent attraction close to the mixture's demixing temperature. This temperature-tunable interaction potentially can be harnessed to assemble colloids and grow colloidal crystals. In this paper, a novel attractive force gradient method, for the first time, is presented to fabricate high quality, single-domain colloidal crystals. The well-controlled attractive force gradient here arises from a temperature gradient in the WL mixture. Nucleation of colloidal crystal in such WL mixture occurs preferably at the high temperature region due to the stronger attraction there. Crystallization propagates from the high temperature region to the low temperature region in a well-controlled way. The growth of the colloidal crystal is characterized in details by Voronoi construction, pair correlation function and orientational order parameter. It is found that the number of crystal-like particles increases with time, and a single-domain 2D colloidal crystal can be produced. The mechanism of the defect-free crystallization process is discussed based on an analogy to cluster beam deposition methods. This study demonstrates an efficient and robust way in preparing colloidal crystals with little to no defect, being well suitable for applications such as colloidal lithography, and fabrication of prefect 3D colloidal crystals.
Xiaoyan Sun; Yang Li; Tian-Hui Zhang; Yu-Qiang Ma; Ze-Xin Zhang
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2013-1-13
Journal Detail:
Title:  Langmuir : the ACS journal of surfaces and colloids     Volume:  -     ISSN:  1520-5827     ISO Abbreviation:  Langmuir     Publication Date:  2013 Jan 
Date Detail:
Created Date:  2013-1-14     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9882736     Medline TA:  Langmuir     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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