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
Swelling of ionic and neutral polymer networks in ionic solutions
TL;DR: In this paper, the dynamic swelling of polymer networks in ionic solution was modelled with a Hamiltonian equation of motion which was transformed into an equation describing the system displacement vector as a function of time.
Journal ArticleDOI
Swelling kinetics of poly(N‐vinylimidazole‐co‐sodium styrenesulfonate) hydrogels
Joaquín Valencia,Inés F. Piérola +1 more
TL;DR: In this article, the authors show that the swelling time dependency is about a δ function: dry hydrogel pellets swell up readily to reach a high degree of swelling and, spontaneously, they deswell to collapse.
Journal ArticleDOI
Structure and Thermal Response of Thin Thermoresponsive Polystyrene-block-poly(methoxydiethylene glycol acrylate)-block-polystyrene Films
Qi Zhong,Ezzeldin Metwalli,Monika Rawolle,Gunar Kaune,Achille M. Bivigou-Koumba,André Laschewsky,Christine M. Papadakis,Robert Cubitt,Peter Müller-Buschbaum +8 more
TL;DR: In this article, thin thermoresponsive films of the triblock copolymer polystyrene block-poly(methoxydiethylene glycol acrylate)-block-polystyrene (P(Sb-MDEGA-b-S)) are investigated on silicon substrates.
Journal ArticleDOI
Swelling and de-swelling of gels under external elastic deformation
TL;DR: In this article, the authors show that the equilibrium Poisson ratio of electrically neutral gels depends on their shear modulus, and that the amount of stress relaxation in uniaxially strained gels is proportional to the shear modulation of the free swollen state.
Journal ArticleDOI
Modeling of liquid desiccant drying method for gelcast ceramic parts
TL;DR: In this article, the kinetics of one-dimensional drying of green gelcast ceramic parts through this method is described by a Fickian model, which accounts for the movement of the gel surface.
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