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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Hydrogels as functional components in artificial cell systems
TL;DR: In this article , the authors explore how hydrogels can be leveraged in the context of artificial cell development and discuss how they can potentially be incorporated within the next generation of artificial cells to engineer improved biological mimics and functional microsystems.
Journal ArticleDOI
Incipient dynamics of swelling of gels
Hang Zhang,M. Carme Calderer +1 more
TL;DR: A model of the incipient dynamics of gel swelling is analyzed and physically realistic boundary conditions describing the motion of the swelling boundary are proposed and the linearized version of the free boundary problem is studied.
Journal ArticleDOI
Confocal Laser Scanning Microscope Imaging of a Pattern in Shrinking Gel
TL;DR: In this paper, the authors used a confocal laser scanning microscope to reveal the time evolution of the spatial distribution of the polymer network in the shrinking gel, and found that the polymer networks are distributed uniformly in the gel at the early stage of bubble pattern formation.
Journal ArticleDOI
Synthesis and properties of organic-inorganic hybrid P(NIPAM-co-AM-co-TMSPMA) microgels
Zheng Cao,Tianyou Chen,Xiaolei Guo,Xianjing Zhou,Jingjing Nie,Jun-Ting Xu,Zhiqiang Fan,Binyang Du +7 more
TL;DR: The phase transition temperature of the microgels was found to be around 34°C, which was independent of the initial terpolymer concentration and shifted to lower temperature with increasing the preparation temperature as discussed by the authors.
Journal ArticleDOI
Control of various morphological changes of poly(meth)acrylate microspheres and their swelling degrees by SPG emulsification
TL;DR: In this paper, a microporous glass membrane (Shirasu Porous Glass, SPG) was employed to prepare uniform emulsion droplets by applying an adequate pressure to the monomer phase, which was composed of the ADVN initiator, solvent of toluene or heptane or their mixture, and a mixture of (meth)acrylate monomers.
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