Hydrogel film

SZ Song, JR Cardinal, SJ Wisniewski, SW Kim. Mechanisms of solute permeation through hydrogel films An irreversible thermodynamic approach. Abstracts of Papers Presented at the 126th National Meeting of the American Pharmaceutical Association, 1979. 

GM Zentner, JR Cardinal, J Feijen, S-Z Song. Progestin permeation through polymer membranes. IV. Mechanism of steroid permeation and functional group contributions to diffusion through hydrogel films. J Pharm Sci 68 970-975, 1979. 

Holtz J.H. and Asher S.A., Polymerized colloidal crystal hydrogel films as intelligent chemical sensing materials, Nature 1997 389 829-832. 

Polymer complexes associated with two or more complementary polymers are widely used in potential applications in the form of particles, hydrogels, films, and membranes. In particular, a polyion complex (PIC) can be easily formed when oppositely charged polyelectrolytes are mixed in aqueous solution and interact via... 

L. Shen, R. Huang, and N.F. Hu, Myoglobin in polyacrylamide hydrogel films direct electrochemistry and electrochemical catalysis. Talanta 56, 1131-1139 (2002). 

R. Huang and N.F. Hu, Direct voltammetry and electrochemical catalysis with horseradish peroxidase in polyacrylamide hydrogel films. Biophys. Chem 104,199-208 (2003). 

Characterization of Hydrogel Films. Mechanical testing was conducted in buffered saline on an Instron instrument, according to the modified ASTM D-1708 (tensile) and D-1938 (tear) and were reported in g/mm2 for modulus and g/mm for tear strength. The water contents and the amount of extractables were measured gravimetr ica1ly. 

Swelling profile determinations of the hydrogel films are provided elsewhere [35]. The results were given as the volume swelling ratio plotted... 

The total swelling time for a dried SPH in aqueous solution is determined by two factors q and t2- h is the time for water to reach all the surface of the pores in the SPHs. It is determined by the effectiveness of the capillary action in a SPH. 2 is the actual swelling time of the polymer matrix, which is determined by the thickness of the cell walls and struts. Because the cell walls and stints of SPHs are very thin, they have very short characteristic swelling times. For SPHs, t2 is comparable to that of a ultrathin hydrogel film. The capillary action is mainly determined by the availability of capillary channels and the wettability of the channels. Various approaches have been attempted to maintain good capillary action (i.e., to decrease q) by maintaining open intercellular channels and good surface wettability. 

J.H. Holtz and S.A. Asher Polymerized Colloidal Crystal Hydrogel Films as Intelligent Chemical Sensing Materials. Nature 389, 829 (1997). 

Wang, S.F., Chen, T., Zhang, Z.L., Pang, D.W., and Wong, K.Y., Effects of hydrophobic room-temperature ionic liquid l-butyl-3-methylimidazolium tetrafluoroborate on direct electrochemistry and biocatalysis of heme proteins entrapped in agarose hydrogel films, Electrochem. Commun., 9, 1709-1714, 2007. 

The mechanical power generated by hydrogel films was evaluated from contraction force multiplied by contraction speed. The speed v was obtained from the... 

The faster swelling/deswelling kinetics of thin hydrogel films is of interest especially from the application point of view. Recently there are some reports in the literature... 

A mixture consisting of the Step 1 product (32 parts), AA -dimethylacrylamide (32 parts), tris(hydroxymethyl)aminomethane (36 parts), hexanol (27 parts), andDarocur (0.3 parts) were cast between two silane-treated glass plates and cured for 1 hour at 70°C. The cured films were then released, extracted in isopropanol, and boiled for 4 hours in water. Hydrogel films were stored in borate bulfered saline solution until needed. 

Clear Hydrogel Films Polysaccharide-based hydrogels Veraco International... 

Luo, Y. Kirker, K.R. Prestwich, G.D. Cross-linked hyaluronic acid hydrogel films new biomaterials for drug delivery. J. Control. Release 2000, 69, 169-184. 

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