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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Ion mediated crosslink driven mucous swelling kinetics
TL;DR: In this article, the authors provide qualitative predictions on the rheology of mucus of healthy individuals versus those infected with Cystic Fibrosis (CF-mucus) using an experimentally guided, multi-phase, multispecies ionic gel model.
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Biomimetic Janus Paper with Controllable Swelling for Shape Memory and Energy Conversion
TL;DR: In this article, an asymmetric swelling system was constructed to induce controllable directional deformation of filter paper, which was applied to achieve reversible energy conversion from the swelling potential energy to mechanical potential energy.
Journal ArticleDOI
Preparation and Timed Release Properties of Self-Rupturing Gels
Udaka K. de Silva,Yakov Lapitsky +1 more
TL;DR: This work prepares self-rupturing gels which are based on a commonly-used, nontoxic, and inexpensive polyelectrolyte, poly(acrylic acid), and are prepared through a simple and low-cost polymerization-based technique.
Journal ArticleDOI
Dynamics of the Volume Phase Transition of a Hydrogel Membrane of a Microcapsule
TL;DR: The dynamic processes of the volume phase transition of pH-sensitive hydrogel wall membranes of microcapsules are much different from those of the conventional bulk gels because of a large proton r....
Journal ArticleDOI
Dynamics of the Phase Separation in a Thermoresponsive Polymer: Accelerated Phase Separation of Stereocontrolled Poly( N, N-diethylacrylamide) in Water
Mitsuhiro Matsumoto,Takanori Tada,Taka-Aki Asoh,Tatsuya Shoji,Takashi Nishiyama,Hideo Horibe,Yukiteru Katsumoto,Yasuyuki Tsuboi +7 more
TL;DR: The slow phase separation process of the dynamic phase separation behavior of thermoresponsive poly( N, N-diethylacrylamide) (PDEA) in an aqueous solution got considerably faster with increasing isotacticity in dilute solutions.
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