Document Detail


Cellulose Nanocrystal iridescence: a new model.
MedLine Citation:
PMID:  22988816     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
A homogeneous aqueous dispersion of Cellulose Nanocrystals (CN) that is left to evaporate in a Petri dish self-organizes into smectic liquid crystals that are actually liquid multilamellar structures. As evaporation proceeds, the liquid multilamellar structures solidify to become a solid multilamellar film. Each solid lamella is in the sub-micron range and its iridescence is easily explained by classical light interference. A careful inspection of each solid lamella revealed long and oriented arrays of colloids. Interestingly, the array orientation is generally the same for each superposed layer. This is exceptional, as the stratification appears first in the liquid, and the solid colloids are formed in each stratum at the very end of the process. Our findings are supported by optical, atomic force and electron microscopes, and laser diffraction observations. The multilamellar solid film model is easier to engineer than the helical model currently used to explain the iridescence and optical activities of CN solid films. This new understanding should promote the industrial production of colorful CN coatings and inks as a green alternative for decades to come.
Authors:
Gilles Picard; Dominique Simon; Yasser Kadiri; Jean-David Lebreux; Fyrial Ghozayel
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-9-18
Journal Detail:
Title:  Langmuir : the ACS journal of surfaces and colloids     Volume:  -     ISSN:  1520-5827     ISO Abbreviation:  Langmuir     Publication Date:  2012 Sep 
Date Detail:
Created Date:  2012-9-19     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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