Download PDF by Shiva P.: Avalanche Dynamics

By Shiva P.

ISBN-10: 3540326863

ISBN-13: 9783540326861

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Example text

Considering the isotropic crosslinked structure of hydrogel, the total Gibbs free energy change of the system, upon swelling, can be written as G= Gmixture + Gelastic . 1) Here, ΔGelastic is the contribution due to the elastic retractive forces and ΔGmixture represents the thermodynamic compatibility of the polymer and the swelling agent (water). In order to express the chemical potential change of water in terms of elastic and mixing contributions at any time of swelling, the differentiating Eq.

Biopolymers, such as gelatin gels and polysaccharides, have been extensively investigated because of their variety of applications in products such as cosmetics and foods. The mechanical performance of conventional hydrogels can be expressed as elastic modulus. , gelatin gel and agarose. The mechanical properties of these gels, however, have been mostly evaluated by shearing or compression, not by stretching, because of poor deformability. 4 Characterization Methods 31 Chemical gels, made via the copolymerization of a monomer in the presence of a crosslinker or by crosslinking of polymer chains, are also mechanically weak.

After changes in both pH and temperature, the gel networks began to collapse. 5 nm molecular diameter to diffuse through the collapsing pores. Heparin release from the gels, however, was not controlled because the mesh sizes of the gels were too large to control heparin diffusion (approximately 3 nm molecular diameter), even in the collapsed gel state. Recently, the authors have developed an approach that could allow a more subtle control and timing of drug delivery. Although smart hydrogels are promising materials for controlling drug delivery, they usually require continuous stimulation to maintain these changes.

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Avalanche Dynamics by Shiva P.


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