Processing and analysis of chitosan nanocomposites reinforced with chitin whiskers and tannic acid as a crosslinker

Viyapuri, Rubentheren; Ward, Thomas A.; Chee, Ching Yern; Tang, Chee Kuang

doi:10.1016/j.carbpol.2014.09.007

Cited by 168 publications

(69 citation statements)

References 33 publications

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“…Chitosan 900 Stretching of C-O from: C-O-H; symmetric and asymmetric stretch from C-O-C bridge [46] 1075 Saccharide structure of chitosan and C-O stretching [47,48] 1157 Saccharide structure of chitosan and anti-symmetric stretching from C-O-C bridge [47,48] …”

Section: ) Assignment Referencementioning

confidence: 99%

Study on the Effect of Silanization and Improvement in the Tensile Behavior of Graphene-Chitosan-Composite

et al. 2015

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Abstract:In the present study, silane-functionalized graphene (f-graphene)-reinforced chitosan nanocomposite films exhibiting enhanced mechanical properties have been prepared by the solution casting method. These nanocomposite films were characterized by X-ray diffraction, Raman spectroscopy and thermogravimetric analysis. In order to investigate the effect of silane functionalization, tensile tests were performed on original, oxidized and silane-functionalized graphene-reinforced chitosan nanocomposite films. Tensile results show that silane functionalization groups offer a substantial increase in the interfacial adhesion between filler and host matrix. This result is also confirmed by the surface morphology of the fracture surface in scanning electron microscope analysis. Qualitative analysis using Raman and Fourier transform infrared spectroscopy revealed the existence of Si-O-Si and Si-O-C bonds in the silanized composite. Thermal analysis of the samples shows that the material is stable up till 250 °C and maintains its thermal stability all throughout the process until it starts degrading after 510 °C. Atomic force microscopy reveals that the material is well exfoliated after the oxidation of graphene and also displays the existence of 3-6 layers of exfoliated graphene sheets. X-ray photoelectron spectroscopy studies also reveal the existence of silicon in the single state and quantify the sample to be approximately around 4% (±0.5%) of the total atomic weight. OPEN ACCESSPolymers 2015, 7 528

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Section: ) Assignment Referencementioning

confidence: 99%

Study on the Effect of Silanization and Improvement in the Tensile Behavior of Graphene-Chitosan-Composite

et al. 2015

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“…Membranes made of nanochitin, applied before interfacing with vacuum instrumentation, were effective in reducing bleeding in this type of treatment [ 52 ]. Chitin nanofi bers were used to enhance the mechanical strength of chitosan fi lms with antimicrobial activity against both gram positive and gram negative bacteria [ 54 ].…”

Section: Loading Active Agents Into Nanochitosanmentioning

confidence: 99%

Nanochitosan and the Skin

Leonida

Kumar

2016

SpringerBriefs in Bioengineering

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Chitosan is a non-toxic, biodegradable, polycationic polysaccharide, easily obtained from the naturally abundant chitin from the exoskeleton of crustaceans (Fig. 9.1 ) through deacetylation (partial, typically 66-95 %) and partial depolymerization (less extensive). It is a polymeric 2-amino-2-deoxy-β-D-glucan formed through 1→4 glycosidic linkages. The interest in chitosan as delivery vehicle for active species was generated by the knowledge that it is broken down by the enzyme lysozyme in the human body releasing harmless amino sugars [ 1 ], hence biocompatible. The rate and extent of its biodegradability depends on its degree of deacetylation (DD), slower for higher DD values [ 2 ].Great interest in this semisynthetic biopolymer obtained from renewable sources (chitin) stems from its remarkable properties : adhesivity, antimicrobial and antifungal effect, immunity enhancing effect, chelating effect, fi lm and gel forming abilities. As such it found applications in pharmaceuticals, as drug delivery vehicle or vaccine carrier, in biotechnology as gene delivery system, in textiles, spun into fi bers or as a coating, in dentistry, in removal of heavy metals from waste waters, as preservative in the food industry, and many others.Chitosan was found active against both gram positive and gram negative bacteria [ 3 -5 ], and fungi [ 6 ]. This, together with its adhesivity, made it interesting for skin applications as well. High molecular weight chitosans have been found more active against gram positive bacteria while low molecular weight ones were more active against gram negative species [ 7 ]. Positively charged chitosan binds to the negatively charged bacterial membrane, triggering agglutination and/or an increase in its permeability, resulting in leakage of cellular components. The fact that chitosan can chelate metals and thereby contributes to inhibiting some enzymatic activities is also part of its biological activity.Being nontoxic and biocompatible , chitosan has been approved by the FDA for use in wound dressings [ 8 ]. As a wound healing biodegradable material chitosan is

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“…This nano-composite film was processed by our research team for this specific purpose and is featured in another article [7]. The suspension was transformed into a thin 3 mm film by the casting evaporation method.…”

Section: Chitosan Nano-composite Solutionmentioning

confidence: 99%

“…A simplified model of this wing was created using spatial network analysis taking the pattern density into account. This is described in detail in another article written by the authors of this work [6].Wing membrane was formed by immersing the structures in a chitosan nano-composite suspension, with chitin whiskers as a physical reinforcement and tannic acid as the crosslinking agent, using the casting evaporation method [7]. After 48 hours of solidification a nano-composite film with a thickness of 0.03 mm was created.…”

Section: Introductionmentioning

confidence: 99%

Experimental analysis of artificial dragonfly wings using black graphite and fiberglass for use in Biomimetic Micro Air Vehicles (BMAVs)

Nair

Ward

Viyapuri

et al. 2015

MATEC Web of Conferences

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Abstract.This article examines the suitability of two different materials which are black graphite carbon fiber and red pre-impregnated fiberglass from which to fabricate artificial dragonfly wing frames. These wings could be of use in Biomimetic Micro Aerial Vehicles (BMAV). BMAV are a new class of unmanned micro-sized air vehicles that mimic flying biological organisms. Insects, such as dragonflies, possess corrugated and complex vein structures that are difficult to mimic. Simplified dragonfly wing frames were fabricated from these materials and then a nanocomposite film was adhered to them, which mimics the membrane of an actual dragonfly. Experimental analysis of these results showed that although black graphite carbon fiber and red pre-impregnated fiberglass offer some structural advantages, red pre-impregnated fiberglass was a less preferred option due to its warpage and shrinking effects. Black graphite carbon fiber with its high load bearing capability is a more suitable choice for consideration in future BMAV applications.

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Processing and analysis of chitosan nanocomposites reinforced with chitin whiskers and tannic acid as a crosslinker

Cited by 168 publications

References 33 publications

Study on the Effect of Silanization and Improvement in the Tensile Behavior of Graphene-Chitosan-Composite

Study on the Effect of Silanization and Improvement in the Tensile Behavior of Graphene-Chitosan-Composite

Nanochitosan and the Skin

Experimental analysis of artificial dragonfly wings using black graphite and fiberglass for use in Biomimetic Micro Air Vehicles (BMAVs)

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