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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Journal ArticleDOI
New polymerized crystalline colloidal array for glucose sensing
Yun Liu,Yongjun Zhang,Ying Guan +2 more
TL;DR: A new principle for PCCA sensing is proposed, in which the analyte-induced swelling of the CCA sphere, rather than that of the hydrogel matrix, is explored for sensing.
Journal ArticleDOI
Adaptive all the way down: Building responsive materials from hierarchies of chemomechanical feedback
Alison Grinthal,Joanna Aizenberg +1 more
TL;DR: This tutorial discusses how chemical kinetics and architecture can be designed to generate stimulus-induced 3D spatiotemporal waves and topographic patterns within a single bulk material, and how feedback between interior dynamics and surface-wide instabilities can further generate higher order buckling and wrinkling patterns.
Book ChapterDOI
Hydration Kinetics of Exocytosed Mucins in Cultured Secretory Cells of the Rabbit Trachea: A New Model
TL;DR: Observations on tissue cultures of respiratory secretory cells reported here show that freshly secreted mucins also undergo swelling during and after exocytosis, which supports the hypothesis that the rheological properties of mucus may be physiologically regulated by hydration via control of the transepithelial movement of water, ions and soluble proteins.
Journal ArticleDOI
Designed Glucose-Responsive Microgels with Selective Shrinking Behavior
TL;DR: Gl glucose-swelling microgels operating under physiological conditions have been obtained by copolymerization with an appropriate choice of alkylacrylamide monomer and boronate derivative by a rational choice of the constituting units of the network structure.
Journal ArticleDOI
Enhanced Absorbent Products Incorporating Cellulose and Its Derivatives: A Review
TL;DR: In this paper, the authors present strategies and mechanisms in which inclusion of cellulose in its various forms can enhance either the capacity or the rate of aqueous fluid absorption in various potential applications.
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