Hierarchical Macroporosity Induced by Constrained Syneresis in Core−Shell Polysaccharide Composites

Renzo, Francesco Di; Valentin, Romain; Boissière, Michel; Tourrette, Audrey; Sparapano, Giuseppe; Molvinger, Karine; Devoisselle, Jean-Marie; Gérardin, and Corine; Quignard, Françoise

doi:10.1021/cm0503477

Cited by 41 publications

(25 citation statements)

References 31 publications

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“…Indeed, the polymer concentration (or ratio) and viscosity of the mixture have no effect on the porosity of xerogels unlike aerogels. In evaporative drying processes, the tension of the meniscus at the solvent vapour interface draws together the colloidal units of the gel and brings to the formation of xerogels with minimal surface area [45]. However, we noticed that values are slightly influenced by the homogenization technique.…”

Section: Structure and Surface Characterizationsmentioning

confidence: 77%

Influence of Homogenization Technique and Blend Ratio on Chitosan/Alginate Polyelectrolyte Complex Properties

et al. 2017

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This is an author's version published in: http://oatao.univ-toulouse.fr/24521 Ahstract Polyelectrolyte complex (PEC) films were pre pared from chitosan (CHI) and alginate (ALG) which are polymers of opposite charge. Two homogenization tech niques and two ratios of ALG CHI blends were compared: mechanical agitation under vacuum (ALG CHI ST) or agitation by high twbulence (ALG CHI UT) and 50'50 or 63/37 ratios. Surface and structure of PEC films are affected by the homogenization technique while the swel ling percentage is only affected by polymer ratio. The homogenization ratio does not seem to infl uence in vitro cell proliferation. Results show that the UT homogeniza tion technique with a 63/37 ratio, which gives films with a smooth, homogeneous surface and a higher rate of enzy matic resistance, is more efficient for cell proliferation and viability. These first results confirm the potential use of ALG CH I films for surgery application.

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Section: Structure and Surface Characterizationsmentioning

confidence: 77%

Influence of Homogenization Technique and Blend Ratio on Chitosan/Alginate Polyelectrolyte Complex Properties

et al. 2017

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“…In the latter case moreover, no syneresis is observed (neither shrinkage of the beads encountered for chitosan nor radial shaft similar to that of chitosan-silica are observed upon drying chitosan-TiO 2 ). [35,36] Remarkable thermal and chemical stabilities are obtained for chitosan-TiO 2 compared to chitosan-SiO 2 (Figure 3). [43,44] These results can be explained by the intrinsic properties of titania compared to silica (isoelectric Scheme 5.…”

Section: Chitosan-tio 2 Hybrid Microspheresmentioning

confidence: 99%

“…Whereas native chitosan microspheres shrink significantly during CO 2 removal, no size reduction of the beads has been observed in the case of chitosan–silica composites. However, the latter presents a radial shaft due to the presence of a rigid shell, which allows the beads to better resist the capillary forces responsible for gel shrinkage 36. Hence, the opening of shafts replaces the bead shrinking and provides an alternative mechanism to decrease the gel volume 36…”

Section: Chitosan–sio2 Hybrid Microspheresmentioning

confidence: 99%

Chitosan Bio‐Based Organic–Inorganic Hybrid Aerogel Microspheres

Kadib

Bousmina

2012

Chemistry A European J

160

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Recently, organic-inorganic hybrid materials have attracted tremendous attention thanks to their outstanding properties, their efficiency, versatility and their promising applications in a broad range of areas at the interface of chemistry and biology. This article deals with a new family of surface-reactive organic-inorganic hybrid materials built from chitosan microspheres. The gelation of chitosan (a renewable amino carbohydrate obtained by deacetylation of chitin) by pH inversion affords highly dispersed fibrillar networks shaped as self-standing microspheres. Nanocasting of sol-gel processable monomeric alkoxides inside these natural hydrocolloids and their subsequent CO(2) supercritical drying provide high-surface-area organic-inorganic hybrid materials. Examples including chitosan-SiO(2), chitosan-TiO(2), chitosan-redox-clusters and chitosan-clay-aerogel microspheres are described and discussed on the basis of their textural and structural properties, thermal and chemical stability and their performance in catalysis and adsorption.

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“…30 The absence in these CS-clay of such a full-356 resistivity against contraction above the CO 2 critical point is attributed to the homogeneous 357 distribution of the clay platelets within the microspheres, with native chitosan being on the 358 peripheries of the beads. …”

mentioning

confidence: 99%

Insightful understanding of the role of clay topology on the stability of biomimetic hybrid chitosan-clay thin films and CO2-dried porous aerogel microspheres

Frindy

Primo

Qaiss

et al. 2016

Carbohydrate Polymers

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Elsevier Frindy, S.; Primo Arnau, AM.; Qaiss, AEK.; Bouhfid, R.; Lahcini, M.; García Gómez, H.; Bousmina, M.... (2016). Insightful understanding of the role of clay topology on the stability of biomimetic hybrid chitosan-clay thin films and CO2-dried porous aerogel microspheres. Carbohydrate Polymers. 146:353-361. doi:10.1016Polymers. 146:353-361. doi:10. /j.cabpel.2016 Irrespective to the clay microstructure, an improvement in the mechanical properties of the 23 chitosan-clay films has been substantiated with CS-SP reaching the highest value at 5% clay 24 loading. While clay addition provides a way to resist the shrinkage occurring for native chitosan, 25 the enhanced hydrophilicity associated to the water content affects the efficacy of the CO 2 super-26 critical drying as the most hydrophilic CS-SP microspheres face the highest shrinkage, resulting 27 in a lowest specific surface area compared to CS-HNT and CS-MMT. Chitosan-clay exhibits 28 enhanced thermal properties with the degradation delayed in the order CS

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Hierarchical Macroporosity Induced by Constrained Syneresis in Core−Shell Polysaccharide Composites

Cited by 41 publications

References 31 publications

Influence of Homogenization Technique and Blend Ratio on Chitosan/Alginate Polyelectrolyte Complex Properties

Influence of Homogenization Technique and Blend Ratio on Chitosan/Alginate Polyelectrolyte Complex Properties

Chitosan Bio‐Based Organic–Inorganic Hybrid Aerogel Microspheres

Insightful understanding of the role of clay topology on the stability of biomimetic hybrid chitosan-clay thin films and CO2-dried porous aerogel microspheres

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