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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Campina, Jm
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (6/6 displayed)
- 2020A layered nanocomposite of laccase, chitosan, and Fe3O4 nanoparticles-reduced graphene oxide for the nanomolar electrochemical detection of bisphenol Acitations
- 2016Reduced graphene oxide-nickel nanoparticles/biopolymer composite films for the sub-millimolar detection of glucosecitations
- 2015Potentiostatic Electropolymerization of Triphenylamine: A Low-Cost Cathode for Solid-State Photovoltaicscitations
- 2013Ultrasound-assisted preparation of size-controlled chitosan nanoparticles: Characterization and fabrication of transparent biofilmscitations
- 2012Aggregation-induced conformational transitions in bovine beta-lactoglobulin adsorbed onto open chitosan structurescitations
- 2011Solid-state electropolymerization and doping of triphenylamine as a route for electroactive thin filmscitations
Places of action
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article
Ultrasound-assisted preparation of size-controlled chitosan nanoparticles: Characterization and fabrication of transparent biofilms
Abstract
The use of biodegradable natural polymers is a suitable alternative for the preparation of more environmentally-friendly plastics and biocompatible nanoparticulated systems. Chitosan is an abundant and inexpensive candidate. However, its transparent films present poor mechanical response and high sensitivity to moisture. Moreover, the findings made by different researchers on the effects of molecular mass and degree of deacetylation (DD) on these properties are still controversial. This paper aims to unveil the separate effects of these parameters on biofilm properties. For these purposes, two aqueous solutions of chitosan (DD = 90 and 95%) were submitted to controlled fragmentation by ultrasonication. The resulting solutions were characterized by rheological techniques and the nanoparticles formed were studied ex-situ by atomic force microscopy (AFM) and scanning electron microscopy (SEM). Irrespective of DD, the application of longer sonication times reduced the viscoelasticity of the solutions and yielded nanoparticles with lower size (and molecular mass). The mechanical strength and stiffness of transparent biofilms fabricated from these solutions, without plasticizers, were determined in stress tests. Sensitivity to moisture was also evaluated through water vapor permeability measurements and water sorption isothermal data. The results showed a significant decrease in the permeability with decreasing the molecular mass. However, the mechanical properties were adversely affected. These findings may be useful for the future design of bioplastics with improved properties but also for the development of biocompatible nanoparticles with tunable size and molecular mass.