Gelatin-Clay Bio-Nanocomposites: Structural and Functional Properties as Advanced Materials

Fernandes, Francisco M.; Ruiz, A.; Darder, Margarita; Ruiz-Hitzky, Eduardo

doi:10.1166/jnn.2009.j002

Cited by 55 publications

(37 citation statements)

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“…The results also ratify previous work of polymerclay nanocomposites [38,[56][57][58][59][60] that show significant enhancement of the mechanical properties of the polymer based on the good dispersion of sepiolite in the polymer matrix at low clay contents, the strong interactions between the components, and the intrinsic properties of sepiolite nanofibres such as a high strength, modulus and specific surface area [34]. Table 4 As determined from the mechanical properties of the nanocomposite films, the additions of sepiolite improve the Young's modulus and tensile strength substantially with the exception of 10wt.% clay.…”

Section: Mechanical Propertiessupporting

confidence: 90%

Porous poly(vinyl alcohol)/sepiolite bone scaffolds: Preparation, structure and mechanical properties

Killeen

Frydrych

Chen

2012

Materials Science and Engineering: C

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Porous poly(vinyl alcohol) (PVA)/sepiolite nanocomposite scaffolds containing 0-10wt.% sepiolite were prepared by freeze-drying and thermally crosslinked with poly(arylic acid).The microstructure of the obtained scaffolds was characterised by scanning electron microscopy and micro computer tomography, which showed a ribbon and ladder like interconnected structure. The incorporation of sepiolite increased the mean pore size and porosity of the PVA scaffold as well as the degree of anisotropy due to its fibrous structure.The tensile strength, modulus and energy at break of the PVA solid material that constructed the scaffold were found to improve with additions of sepiolite by up to 104%, 331% and 22% for 6wt.% clay. Such enhancements were attributed to the strong interactions between the PVA and sepiolite, the good dispersion of sepiolite nanofibres in the matrix and the intrinsic properties of the nanofibres. However, the tensile properties of the PVA scaffold deteriorated in the presence of sepiolite because of the higher porosity, pore size and degree of anisotropy.The PVA/sepiolite nanocomposite scaffold containing 6wt.% sepiolite was characterized by an interconnected structure, a porosity of 89.5% and a mean pore size of 79μm and exhibited a tensile strength of 0.44MPa and modulus of 14.9MPa, which demonstrates potential for this type of materials to be further developed as bone scaffolds.

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Section: Mechanical Propertiessupporting

confidence: 90%

Porous poly(vinyl alcohol)/sepiolite bone scaffolds: Preparation, structure and mechanical properties

Killeen

Frydrych

Chen

2012

Materials Science and Engineering: C

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“…The wet mechanical strength was also significantly improved, which was mainly attributed to the nanodispersion of MMT within the gelatine matrix and the barrier effect of MMT sheets to solvent. A significant enhancement of both the Young's modulus and the tensile strength by about a factor 2 without sacrificing toughness was further confirmed by many authors for other sources of gelatine at a low MMT loading (5 wt%) [12][13][14] (Table 12.3).…”

Section: Gelatine-based Nano-biocompositessupporting

confidence: 60%

Protein/Clay Nano-Biocomposites

Angellier‐Coussy

Gastaldi

2012

Environmental Silicate Nano-Biocomposites

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In the current context, protein-based materials might be considered as an alternative to the petroleum-based plastics since fully biodegradable and characterized by remarkable functional properties that can be exploited in a wide range of non-food applications. To improve their performances that are often restricted by high water sensitivity and low mechanical properties, a relevant strategy consisted in the development of protein/clay nanocomposite. For this purpose, several examples of protein-based nano-biocomposites were presented with a special attention for the methods used for the incorporation of layered silicates (organically modified or not) into the matrices and the ultimate functional properties exhibited by the resulting materials. In terms of mechanical properties, the addition of nanoclays leads to a significant improvement of material performance with an increase of Young's modulus and tensile strength ranging between 1.5 and 2 times. As regards as barrier properties, the improvement appeared quite moderate in spite of a rather good dispersion of layered silicates that would be expected to result in a tortuous pathway limiting diffusion of gases molecules. Thus, a two-fold reduction in water vapour permeability was obtained, and the same or no effect in the case of permeability toward O 2 and CO 2 .

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“…This clay mineral shows high specific surface area ([300 m 2 /g) and large pore volume (*0.4 cm 3 /g) that together with its cationic exchange capacity (*15 meq/100 g) and the involvement of its surface silanol groups make it prone to assemble many different type of compounds [38,39]. Such environment is quite appropriate to assemble biopolymers of different nature [21,[40][41][42][43][44]. Palygorskite is a parent silicate also showing fibrous habit that can be also assembled to natural polymers following the same approaches than those used for sepiolite [39].…”

Section: The Assembling Of Chitosan To Claysmentioning

confidence: 99%

“…are swollen and may intercalate positively charged biopolymers, as for instance chitosan and gelatin, by ion-exchange reactions giving rise to intercalated compounds or even delaminated composites [6,19]. Sepiolite and palygorskite microfibrous clays can also interact through hydrogen bonding and water bridges with neutral and charged biopolymers [20,21]. Apart from the abovementioned procedures involving biopolymers in aqueous solutions, certain modified polymers, such as some derivatives of cellulose and starch, can be thermally compounded with clays by adding plasticizers and other additives [7].…”

Section: Introductionmentioning

confidence: 99%

Chitosan-Clay Bio-Nanocomposites

Darder

Ruiz‐Hitzky

2012

Environmental Silicate Nano-Biocomposites

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The present review chapter includes an overview on the current state-of-art of chitosan-clay based bio-nanocomposites. In the same way than conventional nanocomposites, these biohybrid materials also exhibit both structural and functional properties together with biocompatibility and biodegradability, which can be of great interest for different applications. Four main areas of interest have been identified showing examples of applications as green nanocomposites, bio-nanocomposites addressed to biomedical purposes (tissue engineering and drug delivery), environmental remediation and electroanalytical devices. Finally, examples of bio-nanocomposites based on chitosan assembled to other inorganic solids have been introduced to show the versatility of this biopolymer for development of diverse type of advanced functional materials.

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Gelatin-Clay Bio-Nanocomposites: Structural and Functional Properties as Advanced Materials

Cited by 55 publications

References 0 publications

Porous poly(vinyl alcohol)/sepiolite bone scaffolds: Preparation, structure and mechanical properties

Porous poly(vinyl alcohol)/sepiolite bone scaffolds: Preparation, structure and mechanical properties

Protein/Clay Nano-Biocomposites

Chitosan-Clay Bio-Nanocomposites

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