Viscoelastic Changes in Os-Containing Poly(allylamine) Based Redox Hydrogels for Amperometric Enzyme Electrodes: An EQCM Study

Volume or mass and viscoelastic changes in Os(byp)2ClPyCH2NH2-poly(allylamine) hydrogel (Os-PAA) cross-linked with glucose oxidase (GOx), have been measured by studying the electroacoustic impedance at 10 MHz. Film thickness and shear modulus have been obtained from imaginary and real components of...

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Publicado: 1999
Acceso en línea:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10895647_v103_n42_p8944_Calvo
http://hdl.handle.net/20.500.12110/paper_10895647_v103_n42_p8944_Calvo
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Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) de Universidad de Buenos Aires
id paper:paper_10895647_v103_n42_p8944_Calvo
record_format dspace
spelling paper:paper_10895647_v103_n42_p8944_Calvo2023-06-08T16:06:38Z Viscoelastic Changes in Os-Containing Poly(allylamine) Based Redox Hydrogels for Amperometric Enzyme Electrodes: An EQCM Study Volume or mass and viscoelastic changes in Os(byp)2ClPyCH2NH2-poly(allylamine) hydrogel (Os-PAA) cross-linked with glucose oxidase (GOx), have been measured by studying the electroacoustic impedance at 10 MHz. Film thickness and shear modulus have been obtained from imaginary and real components of the EQCM acoustic impedance in transient (cyclic voltammetry and chronoamperometry) as well as steady state oxidation and reduction of the hydrogel. Swelling of the film during OsII oxidation resulted in mass uptake and decrease of shear modulus. These quantities depend only on the degree of polymer oxidation and not on film history or kinetics. Gravimetry beyond the Sauerbrey mass limit could be realized by use of Martin's viscoelastic model to treat the quartz crystal impedance. 1999 https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10895647_v103_n42_p8944_Calvo http://hdl.handle.net/20.500.12110/paper_10895647_v103_n42_p8944_Calvo
institution Universidad de Buenos Aires
institution_str I-28
repository_str R-134
collection Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA)
description Volume or mass and viscoelastic changes in Os(byp)2ClPyCH2NH2-poly(allylamine) hydrogel (Os-PAA) cross-linked with glucose oxidase (GOx), have been measured by studying the electroacoustic impedance at 10 MHz. Film thickness and shear modulus have been obtained from imaginary and real components of the EQCM acoustic impedance in transient (cyclic voltammetry and chronoamperometry) as well as steady state oxidation and reduction of the hydrogel. Swelling of the film during OsII oxidation resulted in mass uptake and decrease of shear modulus. These quantities depend only on the degree of polymer oxidation and not on film history or kinetics. Gravimetry beyond the Sauerbrey mass limit could be realized by use of Martin's viscoelastic model to treat the quartz crystal impedance.
title Viscoelastic Changes in Os-Containing Poly(allylamine) Based Redox Hydrogels for Amperometric Enzyme Electrodes: An EQCM Study
spellingShingle Viscoelastic Changes in Os-Containing Poly(allylamine) Based Redox Hydrogels for Amperometric Enzyme Electrodes: An EQCM Study
title_short Viscoelastic Changes in Os-Containing Poly(allylamine) Based Redox Hydrogels for Amperometric Enzyme Electrodes: An EQCM Study
title_full Viscoelastic Changes in Os-Containing Poly(allylamine) Based Redox Hydrogels for Amperometric Enzyme Electrodes: An EQCM Study
title_fullStr Viscoelastic Changes in Os-Containing Poly(allylamine) Based Redox Hydrogels for Amperometric Enzyme Electrodes: An EQCM Study
title_full_unstemmed Viscoelastic Changes in Os-Containing Poly(allylamine) Based Redox Hydrogels for Amperometric Enzyme Electrodes: An EQCM Study
title_sort viscoelastic changes in os-containing poly(allylamine) based redox hydrogels for amperometric enzyme electrodes: an eqcm study
publishDate 1999
url https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_10895647_v103_n42_p8944_Calvo
http://hdl.handle.net/20.500.12110/paper_10895647_v103_n42_p8944_Calvo
_version_ 1768541809959501824

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