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Selective crystallization of calcium salts by poly (acrylate)-grafted chitosan

Authordc.contributor.authorNeira Carrillo, Andrónico 
Authordc.contributor.authorYazdani-Pedram Zobeiri, Mehrdad es_CL
Authordc.contributor.authorRetuert de la Torre, Jaime es_CL
Authordc.contributor.authorDíaz Dosque, Mario es_CL
Authordc.contributor.authorGallois, S. es_CL
Authordc.contributor.authorArias, José Luis es_CL
Admission datedc.date.accessioned2008-11-13T10:38:18Z
Available datedc.date.available2008-11-13T10:38:18Z
Publication datedc.date.issued2005-06-01
Cita de ítemdc.identifier.citationJOURNAL OF COLLOID AND INTERFACE SCIENCE 286(1):134-141en
Identifierdc.identifier.issn0021-9797
Identifierdc.identifier.urihttp://repositorio.uchile.cl/handle/2250/120561
Abstractdc.description.abstractThe biopolymer chitosan was chemically modified by grafting polyacrylamide or polyacrylic acid in a homogeneous aqueous phase using potassium persulfate (KPS) as redox initiator system in the presence of N,N-methylene-bis-acrylamide as a crosslinking agent. The influence of the grafted chitosan on calcium salts crystallization in vitro was studied using the sitting-drop method. By using polyacrylamide, grafted chitosan as substrate, rosette-like CaSO4 crystals were observed. This was originated by the presence of sulfate coming from the initiator KPS. By comparing crystallization on pure chitosan and on grafted chitosan, a dramatic influence of the grafted polymer on the crystalline habit of both salts was observed. Substrates prepared by combining sulfate with chitosan or sulfate with polyacrylamide did not produce similar CaSO4 morphologies. Moreover, small spheres or donut-shaped CaCO3 crystals on polyacrylic acid grafted chitosan were generated. The particular morphology of CaCO3 crystals depends also on other synthetic parameters such as the molecular weight of the chitosan sample and the KPS concentration.en
Lenguagedc.language.isoenen
Publisherdc.publisherACADEMIC PRESS INC ELSEVIER SCIENCEen
Keywordsdc.subjectChitosanen
Títulodc.titleSelective crystallization of calcium salts by poly (acrylate)-grafted chitosanen
Document typedc.typeArtículo de revistaen


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