Journal ArticleDOI
Kinetics of swelling of gels
Reads0
Chats0
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
More filters
Journal ArticleDOI
Co-operative diffusion of semi-dilute solutions, concentrated solutions and swollen networks for polystyrene in dibutylphthalate
S.J. Candau,I. Butler,T.A. King +2 more
TL;DR: In this article, the diffusion constant of solutions of polystyrenes of molecular weight ranging from 110 000 to 3.6 × 106 in straight-chain-dibutylphthalate has been measured by photon correlation spectroscopy as a function of polymer volume fraction and temperature.
Journal ArticleDOI
Deswelling Kinetics of Poly (N - isopropylacrylamide) Gels at Volume - Phase Transition
TL;DR: The relaxation time for the slow shrinking (τA) and the time required for the complete homogenization (ta) are long, but the ratio of τA to ta remains almost constant for the gels.
Journal ArticleDOI
Toward a Continuous Intravascular Glucose Monitoring System
Brooke Beier,Katherine M. Musick,Akira Matsumoto,Alyssa Panitch,Eric A. Nauman,Pedro P. Irazoqui +5 more
TL;DR: Two proof-of-concept studies that display the potential of using a glucose-sensitive hydrogel as a continuous glucose sensor are presented and a prototype design is presented for continuous intravascular glucose monitoring by attaching a glucose sensor to an FDA-approved stent.
Journal ArticleDOI
Synthesis and characterization of poly(AAm-co-BMA-co-AAc) hydrogels: effect of acrylamide content on swelling behaviour
TL;DR: In this paper, the effect of acrylamide content on the swelling behavior of poly(acrylamidesco-butyl methacrylate-co-acrylic acid) hydrogels was studied in various concentrations of a dioxane/water mixture as polymerization media.
Journal ArticleDOI
Hydrodynamic properties of mucins secreted by primary cultures of guinea-pig tracheal epithelial cells: determination of diffusion coefficients by analytical ultracentrifugation and kinetic analysis of mucus gel hydration and dissolution.
TL;DR: The findings show that the physicochemical properties of mucin secreted by cultured guinea-pig tracheal epithelial cells are similar to those of mucins of the single or double subunit type purified from respiratory mucus or sputum.
References
More filters
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