Method for producing iridescent solid nanocrystalline cellulose films incorporating patterns
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United States of America Patent
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Mar 19, 2013
Grant Date -
Jun 17, 2010
app pub date -
Dec 4, 2009
filing date -
Dec 11, 2008
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Expired
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Abstract
A new method to produce solid nanocrystalline cellulose (NCC) films containing patterns by differential heating of aqueous suspensions of NCC has been discovered. When acid-form NCC suspensions are dried by heating to temperatures above 50° C., darkening of the NCC can occur, while neutral forms of NCC can produce iridescent chiral nematic films by heating to temperatures up to 105° C. Placing materials of different thermal conductivity beneath the container containing an evaporating NCC suspension results in watermark-like patterns of different iridescent color imprinted within the film structure. Other colloidal rod-like particles can be employed in place of nanocrystalline cellulose (NCC), for example chitin or chitosan.
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