Journal ArticleDOI
Kinetics of swelling of gels
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TLDR
In this article, a theory of the kinetics of the swelling of polyacrylamide gels is presented, which is based on the assumption that the swelling time is determined by the diffusion coefficient of the fluid molecules.Abstract:
We present a theory of the kinetics of the swelling of a gel. The characteristic time of swelling is proportional to the square of a linear dimension of the gel and is also proportional to the diffusion coefficient of the gel network, which is defined as D=E/f where E is the longitudinal bulk modulus of the network, and f is the coefficient of friction between the network and the gel fluid. This constitutes an essential difference between the present theory and the previous theory which is based on the assumption that the swelling time is determined by the diffusion coefficient of the fluid molecules. Experimental data are shown for spheres of 5% polyacrylamide gels and are analyzed using the present theory. The value of the diffusion coefficient obtained from the macroscopic swelling experiments shows excellent agreement with that obtained microscopically using laser light scattering spectroscopy.read more
Citations
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Volume-shrinking kinetics of transient gels as a consequence of dynamic interplay between phase separation and mechanical relaxation
Takehito Koyama,Hajime Tanaka +1 more
TL;DR: In this paper, the volume-shrinking kinetics of a transient gel and compare it with that of a permanent chemical gel undergoing a volume phase transition were studied, showing that the elasticity of transient gels is the reverse of its disappearance.
Journal ArticleDOI
Swelling activation energy of κ-carrageenan in its gel state: A fluorescence study
Ozlem Tari,Önder Pekcan +1 more
TL;DR: In this paper, a steady-state fluorescence technique was employed to study the swelling of κ-carrageenan gels at various temperatures, and pyranine was used as a fluorescence probe.
Journal ArticleDOI
Microporous poly(vinyl methyl ether) hydrogels prepared by γ-ray irradiation at different heating rates
TL;DR: In this paper, aqueous solution poly(vinyl methyl ether) (PVME) at different heating rates was prepared for thermoresponsive and microporous polymer hydrogels by γ-ray irradiation.
Journal ArticleDOI
Preparation and evaluation of soft preformed particle gels for conformance control in carbonate reservoir
TL;DR: In this article, a three-stage swollen history is discovered by fitting the power-law relation of modulus and volume fraction, which is inferred that the deviation is caused by stress relaxation and secondary crosslink.
Journal ArticleDOI
Intramolecular force-compensated hydrogel-based sensors with reduced response times
Simon Binder,Gerald Gerlach +1 more
TL;DR: In this article, a bisensitive hydrogel is used to compensate for the intramolecular force of a sensor to reduce the response time of chemical sensors and improve their long-term stability.
References
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Journal ArticleDOI
Statistical-Mechanical Theory of Irreversible Processes : I. General Theory and Simple Applications to Magnetic and Conduction Problems
TL;DR: In this paper, a general type of fluctuation-dissipation theorem is discussed to show that the physical quantities such as complex susceptibility of magnetic or electric polarization and complex conductivity for electric conduction are rigorously expressed in terms of timefluctuation of dynamical variables associated with such irreversible processes.
Journal ArticleDOI
Spectrum of light scattered from a viscoelastic gel
TL;DR: In this paper, the spectrum of light scattered from thermally excited displacement fluctuations in polyacrylamide gels was measured using optical mixing spectroscopy, and the correlation function for the displacements having wave vector q is predicted for these gels to have the form of an exponential decay: exp(− Γt).
Journal ArticleDOI
An Introduction to the Theory of Elasticity
P. G. Appleby,R. J. Atkin,N. Fox +2 more