Hydrogels network

Veerman C, Rajagopal K, Palla CS, Pochan DJ, Schneider JP, Furst EM. Gelation kinetics of /3-hairpin peptide hydrogel networks. Macromolecules 2006 39 6608-6614. 

Three-dimensional hybrid hydrogel networks were also prepared by the authors in the current application by functionalizing the step 5 derivatives with metha-cryloyl dextran. 

Preparation of a crosslinked hydrogel network General procedure... 

Fig. 6 Triggered self-assembly of a peptide P-hairpin that forms fibrillar structures, which show facial and lateral self-assembly to hydrogel networks. Reprinted, with permission, from [96] copyright (2004) Elsevier...

Pharmaceutical grade poly(ethylene glycols) are poly(ethylene oxides) with terminal hydroxyl groups and have been approved by the E.D.A. and listed in both the United States Pharmacopoeia and Martindale under Macrogols for use as ointment and suppository bases (4J. Poly(ethylene glycol) can be chemically cross-linked retaining the hydrophilic nature of the PEO backbone in an infinite hydrogel network which will imbibe water and swell but not... 

The silica hydrogel network constitutes the framework of the silica-alumina gel. From a textural point of wiev, a silica-alumina xerogel seems to be an "image" of the starting silica hydrogel. Depending on the alumina content the silica-alumina gels exhibit predominantly a silica-like texture or an alumina-like texture. 

SCHEME 20 Suspended primary silica particles in a sol link into chains to form a hydrogel network that shrinks to varying degrees when dried depending on the surface tension of the solvent. 

Lynch, I. and Dawson, K.A. (2003) Effect of a polymeric additive on the pore-size distribution and shrinking process of a hydrogel network. Macromol. Chem. Phys., 204,443 450. 

C halter] i P. R., Kaur H. Interpenetrating hydrogel networks 3. Properties of the gelatin-sodium carboxymethylcellulose system. Polymer 1992 33 2388— 2391. 

The opacity was attributed to the formation of stable complexes between calcium ions and low molecular weight biomolecules, possibly lysozymes, rather than being caused by calcium phosphate deposits. Lysozyme has been reported to be able to penetrate the intertices of PHEMA hydrogel networks (45,46). It has molecular dimensions of approximately 4.0 nm x 4.0 nm x 1.9 nm (47), which are smaller than the PHEMA hydrogel mesh size of 10 - 100 nm which was estimated from SEM micrographs (48). 

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