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Shchipunov, Yury,Sarin, Sergei,Kim, Il,Ha, Chang-Sik Royal Society of Chemistry 2010 GREEN CHEMISTRY Vol.12 No.7
<P>Hydrogels are prepared by means of progressive acidification of xanthan solution containing dispersed chitosan particles in noncharged state at pH a little larger than p<I>K</I><SUB>a</SUB> of this polysaccharide. The following pH shift causes gradual charging of chitosan macromolecules that are involved into electrostatic interactions with oppositely charged xanthan. This triggered self-regulating processes of polysaccharide self-organization into supramolecular structures. Fibrillation or capsulation was observed that depended on the charge mixing ratio between chitosan and xanthan. The jellification of solutions took place in a case of fibrillar morphology. The strongest hydrogels were found where a fine and dense network of aligning fibrils of mean diameter of around 30 nm were generated. Where oppositely charged polysaccharides self-organized into capsules, the hydrogel was not formed because of the absence of cross-links between particles that could reach few mm in diameter and had mechanically strong shell.</P> <P>Graphic Abstract</P><P>Monolithic hydrogels or capsules are formed through the electrostatic interactions of anionic polysaccharide with chitosan that are gradually charged in the course of a progressive pH decrease by chemical acidulant. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=b925138c'> </P>
Bionanocomposites formed by <i>in situ</i> charged chitosan with clay
Shchipunov, Yury,Ivanova, Nadya,Silant'ev, Vladimir Royal Society of Chemistry 2009 Green chemistry Vol.11 No.11
<P>Bionanocomposites are formed through the electrostatic interactions of exfoliated clay nanoparticles initially dispersed in an aqueous solution with chitosan macromolecules that are gradually charged in the course of a progressive pH decrease by chemical acidulating agent to exclude the phase separation.</P> <P>Graphic Abstract</P><P>Bionanocomposites are formed through the electrostatic interactions of exfoliated clay nanoparticles with chitosan macromolecules that are gradually charged in the course of a progressive pH decrease by chemical acidulating agent. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=b914548f'> </P>