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Fundamental properties and applications of responsive hydrogels in confined geometries.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Fundamental properties and applications of responsive hydrogels in confined geometries.
Author:	Harmon, Marianne Elisabeth.
Description:	245 p.
Notes:	Adviser: Curtis W. Frank.
Notes:	Source: Dissertation Abstracts International, Volume: 64-09, Section: B, page: 4492.
Contained By:	Dissertation Abstracts International64-09B.
Subject:	Engineering, Chemical.
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3104238
ISBN:	0496518062

Fundamental properties and applications of responsive hydrogels in confined geometries.
Harmon, Marianne Elisabeth.

Fundamental properties and applications of responsive hydrogels in confined geometries. [electronic resource] - 245 p.

Adviser: Curtis W. Frank.

Thesis (Ph.D.)--Stanford University, 2003.

Finally, we have evaluated the potential use of NIPAAm hydrogels as actuators in microfluidic devices, which requires that the hydrogel swelling be anisotropic. The kinetics of the volume phase transition is often a limiting factor, and we have studied the time scale of response for a series of semi-interpenetrating polymer networks (semi-IPNs) based on NIPAAm hydrogels. We have used confocal fluorescence microscopy to image the internal structures of the semi-IPNs, and the rate of response is interpreted as a function of the composition as well as the morphology of the samples. The performance and limitations of the hydrogel actuator were interpreted in terms of the kinetics of the volume phase transition as well as the degree of swelling and transition temperature of the hydrogel layers.

ISBN: 0496518062Subjects--Topical Terms:

226989
Engineering, Chemical.

Fundamental properties and applications of responsive hydrogels in confined geometries.
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520 # $a Finally, we have evaluated the potential use of NIPAAm hydrogels as actuators in microfluidic devices, which requires that the hydrogel swelling be anisotropic. The kinetics of the volume phase transition is often a limiting factor, and we have studied the time scale of response for a series of semi-interpenetrating polymer networks (semi-IPNs) based on NIPAAm hydrogels. We have used confocal fluorescence microscopy to image the internal structures of the semi-IPNs, and the rate of response is interpreted as a function of the composition as well as the morphology of the samples. The performance and limitations of the hydrogel actuator were interpreted in terms of the kinetics of the volume phase transition as well as the degree of swelling and transition temperature of the hydrogel layers.
520 # $a Responsive hydrogels can undergo a dramatic change in volume in response to different stimuli, but applications of these materials inevitably constrain the swelling behavior in some way. Here we present a study of the fundamental properties of responsive hydrogels in confined geometries, focusing on applications of these materials. We have developed a technique based on surface plasmon resonance and optical waveguide spectroscopy to study temperature-responsive N-isopropylacrylamide (NIPAAm) hydrogel layers and the resulting anisotropic swelling as a function of temperature, pH, salt concentration, and hydrostatic pressure.
520 # $a We have used photocrosslinkable co- and terpolymers based on NIPAAm and 2-(dimethyl maleimido)-N-ethyl-acrylamide as the photosensitive component to prepare uniform hydrogel layers with dry film thicknesses ranging from approximately 10 nm to 2.5 mum. The volume phase transition is characterized by the degree of swelling and the transition temperature, and the variation of these parameters in response to different stimuli were explained by existing models for the anisotropic swelling of hydrogel layers. The hydrogel mechanical properties were measured with atomic force microscopy, and it was possible to study the gel morphology by comparing the measured modulus to that calculated from theory. We have also studied the effect of reference state by using free-radical polymerized hydrogel layers, and these materials were compared to the corresponding bulk hydrogels.
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