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
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Journal ArticleDOI
Microgel particles as model colloids : theory, properties and applications
Brian R. Saunders,Brian Vincent +1 more
TL;DR: An overview of the literature concerning microgel particles with emphasis on work performed during the past 5 years is presented in this paper, where the poly(NIPAM) system is considered in detail in terms of swelling, rheological, small-angle neutron scattering (SANS) and kinetic data.
Journal ArticleDOI
A theory of coupled diffusion and large deformation in polymeric gels
TL;DR: A theory of the coupled mass transport and large deformation of a polymeric gel, which assumes that the local rearrangement of molecules is instantaneous, and model the long-range migration by assuming that the small molecules diffuse inside the gel.
Journal ArticleDOI
Soft nanotechnology with soft nanoparticles.
Satish Nayak,L. Andrew Lyon +1 more
TL;DR: This review will present some of the recent advances in the marriage between water-swellable networks and nanoscience, as well as new classes of soft nanomaterials are being developed from more traditional polymeric constructs.
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Functions for fish mucus
TL;DR: This work has shown that mucus-based defences, including filter feeding, adhesion and abhesion, can be modelled on the basis of the state of mucus on fish surfaces and experimental approaches.
Book ChapterDOI
Volume phase transition and related phenomena of polymer gels
TL;DR: A review of the recent advances in studies of the volume phase transition and critical phenomena of polymer gels mostly carried out in our group from 1973 to the present can be found in this article.
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