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One Dimensional Volume‐Phase Transition of N‐Isopropylacrylamide Gels on the Surface of Gold Electrodes
Author(s) -
Karbarz Marcin,
Gniadek Marianna,
Stojek Zbigniew
Publication year - 2005
Publication title -
electroanalysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.574
H-Index - 128
eISSN - 1521-4109
pISSN - 1040-0397
DOI - 10.1002/elan.200503294
Subject(s) - poly(n isopropylacrylamide) , electrode , phase transition , chemistry , phase (matter) , analyte , adhesion , chemical engineering , volume (thermodynamics) , nanotechnology , analytical chemistry (journal) , materials science , copolymer , chromatography , organic chemistry , polymer , thermodynamics , physics , engineering
Numerous 500‐μm layers of the cross‐linked poly( N ‐isopropylacrylamide) gel were anchored on the surface of gold electrodes. It has been found that at circa 34 °C, as it occurs in bulk gels, the gel layers undergo the volume phase transition (effective shrinking). Since the adhesion of the gel layers to gold appeared to be sufficiently strong, the phase transition was in fact one‐dimensional. The shrinking process has been examined optically and voltammetrically using 1,1′‐ferrocenedimethanol as a model electroactive analyte. Good adhesion of poly( N ‐isopropylacrylamide) gel to gold electrodes makes the gel layers potential hosts for enzymes and other catalysts. On the other hand the shrinking process may offer a convenient way to replace analytes and catalysts in the gel layers.