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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Syneresis of Carrageenan Gels: NMR and Rheology
TL;DR: In this article, a method to predict the syneresis of carrageenan gels using 133Cs NMR is proposed, which is supported by rheological measurements that show that the modulus remains constant over time at temperatures below the transition temperature.
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Laboratory Evaluation of a Novel Self-Healable Polymer Gel for Co2 Leakage Remediation During Co2 Storage and Co2 Flooding
Tao Song,Zhanmiao Zhai,Juncen Liu,Yugandhara Eriyagama,Adel Alotibi,Ze Wang,Thomas P. Schuman,Baojun Bai +7 more
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Bioinspired synthesis of poly(phenylboronic acid) microgels with high glucose selectivity at physiological pH
Qingshi Wu,Xue Du,Aiping Chang,Xiaomei Jiang,Xiao-Yun Yan,Xiao-Yu Cao,Zahoor H. Farooqi,Weitai Wu +7 more
TL;DR: The highly selective glucose-response of the microgels suggests the potential for development into sensors for detection of glucose in serums of fasting bloods and even non-fasting bloods (as models of complex bio-systems).
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Hofmeister Effect on Thermo-responsive Poly( N -isopropylacrylamide) Hydrogels Grafted on Macroporous Poly(vinyl alcohol) Formaldehyde Sponges
TL;DR: In this article, the Hofmeister effects of nine kinds of anions at different concentrations on the lower critical solution temperature (LCST) of the macroporous thermo-responsive poly(N-isopropylacrylamide) grafted poly(vinyl alcohol) formaldehyde (PVF-g-PNIPAM) hydrogels are investigated with differential scanning calorimetry.
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An Interface-Capturing Regularization Method for Solving the Equations for Two-Fluid Mixtures
TL;DR: This work develops a reg- ularization method to solve the two-phase gel equations when the volume fraction of one phase goes to zero in part of the computational domain, and produces an accurate solution of these equations for the full range of relevant reg- Ularization parameter values.
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