Search results for "Solvent casting"

showing 4 items of 4 documents

Effect of graphene and fabrication technique on the release kinetics of carvacrol from polylactic acid

2019

Abstract Porous membranes and thin films containing poly-lactic acid (PLA), carvacrol (CRV) and graphene nanoplatelets (GNP) were fabricated by electrospinning and solvent casting at different formulations. The systems were characterized from a mechanical, morphological, calorimetric and spectroscopic point of view. CRV release as a function of time was studied and a mathematical model was used to fit and interpret the data in order to investigate the release mechanism. The results indicate that the incorporation of GNP generally determined a simultaneous strengthening, stiffening and toughening effect, while preserving a good ductility. Furthermore, integrating GNP allowed tuning the amoun…

Materials scienceKinetics02 engineering and technology010402 general chemistry01 natural sciencesEssential oillaw.inventionchemistry.chemical_compoundPolylactic acidlawControlled releaseThin filmComposite materialDuctilityElectrospinningGrapheneGeneral EngineeringSettore ING-IND/34 - Bioingegneria Industriale021001 nanoscience & nanotechnologyCastingElectrospinningSolvent casting0104 chemical sciencesSolventSettore ING-IND/22 - Scienza E Tecnologia Dei MaterialichemistryCeramics and CompositesGraphene0210 nano-technology
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PLA-based functionally graded laminates for tunable controlled release of carvacrol obtained by combining electrospinning with solvent casting

2020

Abstract A novel approach was designed to fabricate high-added value manufacts, starting from cost-effective materials and combining well-known processing techniques. Bi- and three-layered, functionally graded laminates were achieved by direct electrospinning onto dense substrates. The architecture of each multilayer comprises a dense layer formed by solvent casting, which is constituted by polylactic acid (PLA) and carvacrol, and one or two electrospun fibrous skin layers, consisting of PLA only. Processing-structure-properties relationships of such materials were investigated. As regards mechanical behavior, the amount of fibrous PLA layers determined an increase of stiffness from 20 to 3…

Materials sciencePolymers and PlasticsGeneral Chemical Engineering02 engineering and technology010402 general chemistry01 natural sciencesBiochemistrychemistry.chemical_compoundPolylactic acidUltimate tensile strengthMaterials ChemistryEnvironmental ChemistryComposite materialControlled drug release Electrospinning onto film Functionally graded Multilayer Peppas model Solvent castingGeneral Chemistry021001 nanoscience & nanotechnologyControlled releaseCastingElectrospinning0104 chemical sciencesSolventSettore ING-IND/22 - Scienza E Tecnologia Dei MaterialichemistryElongation0210 nano-technologyLayer (electronics)Reactive and Functional Polymers
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Rapid and eco-friendly synthesis of graphene oxide-silica nanohybrids

2014

The increasing interest in Graphene oxide (GO) is due to many issues: the presence of both sp2-conjugated atoms and oxygen-containing functional groups provides a strong hydrophilicity and the possibility to further functionalize it with other molecules (i.e. π-π interactions covalent attachment etc.) [1]. Furthermore since the GO is biocompatible and noncytotoxic many studies have been recently focused on the development of GO-based nanodevices for bioimaging DNA detection drug delivery. Due to their low cytotoxicity and large internal surface area silica nanoparticles have been taken into account as promising material for biolabeling and drug loading/delivery. Particular consideration has recently been demonstrated for GO-silica composites because of the potentialities for electrical applications their chemical inertia and stability toward ions exposure. The possibility to combine the extraordinary properties of GO and silica offers several advantages for the realization of nanoprobes for biological applications and of biosensor [12]. The strategy for the fabrication of GO-nanosilica nanohybrids can be schematized as follows: (i) synthesis of GO by oxidizing graphite powder with the method described by Marcano et al. [3] (ii) Preparation of oxygen-loaded silica nanoparticles by thermal treatments in controlled atmosphere in order to induce high NIR emission at 1272 nm from high purity silica nanoparticles. (iii) preparation of GrO-silica nanohybrid films via rapid solvent casting in water. The nanohybrids were tested by XPS FTIR Raman analysis UV photoluminescence analysis TGA Zeta potential measurements electrical tests AFM and SEM. Several nanohybrids were prepared by combining two different typologies of GO and two different samples of silica.
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Effect of different processing techniques and presence of antioxidant on the chitosan film performance

2022

In the last two decades, the naturally occurring polysaccharides have gained great attention because of their potential applications in different sectors, for example, from food to biomedical sectors. Chitosan is a cationic polysaccharide with good transparency, and currently, it has been considered also as suitable material for the formulation film and coating in cultural heritage protection. In this work, the chitosan films (Ch), with and without natural antioxidant such as citric acid (CA), are formulated considering two different processing techniques: (i) conventional solvent casting and (ii) compression molding, that is an unconventional method for this polysaccharide, giving the poss…

solvent castingMarketingantioxidantPolymers and PlasticsGeneral Chemical Engineeringchitosan filmsMaterials Chemistrycompression moldingGeneral Chemistrycitric acidJournal of Vinyl and Additive Technology
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