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
Surface compaction versus stretching in Pickering emulsions stabilised by microgels
TL;DR: In this paper, the authors review recent advances in the emulsion stabilisation mechanism, particularly focusing on the microgel conformation at the interface in relation with the mechanical interface behaviour and the emuls macroscopic stability.
Book ChapterDOI
An approach to artificial muscle using polymer gels formed by micro-phase separation
Makoto Suzuki,O. Hirasa +1 more
TL;DR: In this paper, the authors presented advances made in chemomechanical energy conversion by polymer gels aiming to produce artificial muscle, which can be attained by producing porous structures by micro-phase separation.
Journal ArticleDOI
Protein disorder-order interplay to guide the growth of hierarchical mineralized structures.
Sherif Elsharkawy,Maisoon Al-Jawad,Maria F. Pantano,Esther Tejeda-Montes,Khushbu Mehta,Hasan Jamal,Shweta Agarwal,Kseniya Shuturminska,Alistair Rice,Nadezda V. Tarakina,Rory M. Wilson,Andrew J. Bushby,Matilde Alonso,José Carlos Rodríguez-Cabello,Ettore Barbieri,Ettore Barbieri,Armando del Río Hernández,Molly M. Stevens,Nicola M. Pugno,Nicola M. Pugno,Nicola M. Pugno,Paul H. Anderson,Alvaro Mata +22 more
TL;DR: A protein-mediated mineralization process that takes advantage of disorder–order interplay using elastin-like recombinamers to program organic–inorganic interactions into hierarchically ordered mineralized structures is reported.
Book ChapterDOI
Hydrophobic weak polyelectrolyte gels: Studies of swelling equilibria and kinetics
TL;DR: In this article, the equilibrium and kinetic swelling properties of a class of hydrophobic weak polyelectrolyte copolymer gels synthesized from n-alkyl methacrylates (hydrophobic) and N,N-dimethylaminoethyl methacylate (weak base) are summarized.
Journal ArticleDOI
A chemo-electro-mechanical mathematical model for simulation of pH sensitive hydrogels
Sudipto K. De,Narayana R. Aluru +1 more
TL;DR: In this paper, an improved mathematical model is presented to predict the swelling/deswelling rates of hydrogels in buffered pH solutions, which takes into account the electro-static effects and replaces the Donnan theory with the more general chemo-electro-mechanical model.
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