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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Dynamic Behaviors of Solvent Molecules Restricted in Poly (Acryl Amide) Gels Analyzed by Dielectric and Diffusion NMR Spectroscopy.
Hironobu Saito,Shunpei Kato,Keisuke Matsumoto,Yuya Umino,Rio Kita,Naoki Shinyashiki,Shin Yagihara,Minoru Fukuzaki,Masayuki Tokita +8 more
TL;DR: A universal treatment of slow dynamics due to the restriction from polymer chains suggests a new methodology of characterization of water structures.
Journal ArticleDOI
Swelling properties of thermoresponsive/hydrophilic co-networks with functional crosslinked domain structures
TL;DR: In this article, the authors designed novel thermoresponsive/hydrophilic polymer co-networks with functional crosslinked domain (CD) structures such as a thermore sponsor network with hydrophilic CDs (DCDN gel) and a hydrophicient network with thermore sponsorsive CDs (NCDD gel), where the gel synthesis was based on post-polymerization crosslinking of triblock prepolymers with reactive sites in the outer blocks.
Journal ArticleDOI
Swelling of thermo-responsive gels under hydrostatic pressure
TL;DR: In this article, a constitutive model for the elastic behavior of a thermo-responsive gel subjected to swelling in a water bath to which hydrostatic pressure is applied is developed, and material constants are found by fitting experimental data on poly(nisopropylacrylamide) gel under unconstrained swelling.
Journal ArticleDOI
Preparation of macroporous poly(N-isopropylacrylamide) hydrogels using a suspension–gelation method
TL;DR: In this paper, a macroporous hydrogel, consisting of a homogeneous cross-linked polymer network and linear polymers containing randomly distributed sphere-like cavities, was developed using a suspension-gelation method.
Journal ArticleDOI
Hydrogel Nanoparticle as a Functional Coating Layer in Biosensing, Tissue Engineering, and Drug Delivery
TL;DR: An important class of responsive hydrogels, that is, nanosized hydrogel particles (nanogels), are described for thee synthesis, modification, and application in assembly of functional coating layers.
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