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Solution and Surface Composition Gradients via Microfluidic Confinement: Fabrication of a Statistical‐Copolymer‐Brush Composition Gradient
Author(s) -
Xu C.,
Barnes S. E.,
Wu T.,
Fischer D. A.,
DeLongchamp D. M.,
Batteas J. D.,
Beers K. L.
Publication year - 2006
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.200502341
Subject(s) - materials science , copolymer , composition (language) , microchannel , atom transfer radical polymerization , substrate (aquarium) , fabrication , polymer brush , chemical engineering , microfluidics , polymer , polymer chemistry , polymerization , nanotechnology , composite material , medicine , philosophy , linguistics , oceanography , alternative medicine , pathology , geology , engineering
A stable solution composition gradient is generated inside a microchannel by varying the relative flow rates of two solutions that differ in composition. This solution gradient is used to synthesize a surface‐grafted statistical‐copolymer‐brush composition gradient via surface‐initiated atom transfer radical polymerization (ATRP; see schematic). Near‐edge absorption fine structure spectroscopy confirms the continuous transition of surface composition from one end of the substrate to the other.