Continuously producing digital micro-scale patterns on a thin polymer film
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United States of America Patent
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Jul 11, 2017
Grant Date -
Jan 22, 2015
app pub date -
Jul 17, 2013
filing date -
Jul 17, 2013
priority date (Note) -
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Abstract
A liquid thin film is disposed on a conveyor surface (e.g., a roller or belt) that moves the thin film into a precisely controlled gap (or nip) region in which the liquid thin film is subjected to an electric field that causes the liquid to undergo electrohydrodynamic (EHD) patterning deformation, whereby portions of the liquid thin film form patterned liquid features having a micro-scale patterned shape. A curing mechanism (e.g., a UV laser) is used to solidify (e.g., in the case of polymer thin films, cross-link) the patterned liquid inside or immediately after exiting the gap region. The patterned structures are either connected by an intervening web as part of a polymer sheet, or separated into discreet micro-scale structures. Nanostructures (e.g., nanotubes or nanowires) disposed in the polymer become vertically oriented during the EHD patterning process. Segmented electrodes and patterned charges are utilized to provide digital patterning control.
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