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Littérature scientifique sur le sujet « Bionanocompositi »

Auteur : Grafiati

Publié le 10 mars 2023

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Articles de revues sur le sujet "Bionanocompositi"

Modi, Vaibhav, and Antti J. Karttunen. "Molecular Dynamics Simulations on the Elastic Properties of Polypropylene Bionanocomposite Reinforced with Cellulose Nanofibrils." Nanomaterials 12, no. 19 (2022): 3379. http://dx.doi.org/10.3390/nano12193379.

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Cellulose-reinforced polypropylene bionanocomposites can show improved elastic properties over their pure polypropylene counterparts. We have used equilibrium and non-equilibrium molecular dynamics (MD) simulations to study the elastic properties of polypropylene bionanocomposite systems composed of cellulose nanofibrils (CNF), polypropylene (PP) matrix, and maleic anhydride (MAH) coupling agent. The components of the bionanocomposite were parametrized for compatibility with the AMBER14SB force fields. The elastic properties of pure PP systems converge for the chains with at least 20 monomers. The ratio of cellulose in CNF-PP bionanocomposites strongly affects their elastic properties. The elastic modulus of CNF-PP bionanocomposites shows small improvement when the adhesion between hydrophobic and hydrophilic components is facilitated by a MAH coupling agent. The results demonstrate how fully-atomistic MD simulations can be systematically used to evaluate the elastic properties of CNF-PP bionanocomposites and to make predictions that are in agreement with experiments.

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Zakuwan, Siti, та Ishak Ahmad. "Synergistic Effect of Hybridized Cellulose Nanocrystals and Organically Modified Montmorillonite on κ-Carrageenan Bionanocomposites". Nanomaterials 8, № 11 (2018): 874. http://dx.doi.org/10.3390/nano8110874.

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The synergistic effect of using κ-carrageenan bionanocomposites with the hybridization of cellulose nanocrystals (CNCs) and organically modified montmorillonite (OMMT) reinforcements was studied. The effects of different reinforcements and filler contents were evaluated through mechanical testing, and morphological and water uptake properties. The tensile strength and Young’s modulus of both bionanocomposites increased with filler loading and optimized at 4%. OMMT incorporation into the κ-carrageenan/CNCs bionanocomposites resulted in further mechanical property improvement with an optimum ratio of 1:1 (CNCs:OMMT) while maintaining high film transparency. X-ray diffraction and morphological analyses revealed that intercalation occurred between the κ-carrageenan bionanocomposite matrix and OMMT. The water uptake of the κ-carrageenan bionanocomposites was significantly reduced by the addition of both CNCs and OMMT. The enhancements in the mechanical properties and performance of the hybrid bionanocomposite indicate compatibility among the reinforcement, biopolymer, and well-dispersed nanoparticles. This renders the hybrid CNC/OMMT/κ-carrageenan nanocomposites extremely promising for food packaging applications.

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Indarti, Eti, Arisa Sri Marlita, and Zaidiyah Zaidiyah. "SIFAT TRANSPARANSI DAN PERMEABILITAS FILM BIONANOKOMPOSIT POLYLACTIC ACID DAN POLYCAPROLACTONE DENGAN PENAMBAHAN NANOCRYSTALLINE CELLULOSE SEBAGAI PENGISI [Transparency and permeability properties of Bionanocomposite Film of Polylactic Acid and Polycaprolactone, and Nanocrystalline Cellulose as a Filler]." Jurnal Teknologi & Industri Hasil Pertanian 25, no. 2 (2020): 81. http://dx.doi.org/10.23960/jtihp.v25i2.81-89.

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Production of Polylactic acid (PLA)/Polycaprolactone (PCL) bionanocomposite films with various ratios was done by adding nanocrystalline celullose (NCC) from oil palm empty fruit bunches (OPEFB) as a filler. The aim of the research was to find out the effect of PLA/PCL ratio on film thickness, transparency of bionanocomposite films and water vapor permeability or WVP of the film bionanocomposite with addition of the 3% NCC. The PLA/PCL ratio are 1.0/0.0; 0.8/0.2; 0.6/0.4; 0.5/0.5; 0.4/0.6; 0.2/0.8; and 0.0/1.0, prepared with solvent casting method. Characterization of PLA/PCL bionanocomposites film performed was thickness, transparency test and water vapor permeability (WVP) test. The thickness of bionanocomposites film produced were around are about 0.036-0.053 mm, results show that the lower PLA/PCL ratio the thicker film obtained. The highest value of film transparency was obtained at a ratio of 1.0 / 0.0 (81.4% at a wavelength of 550 nm), the smaller the PLA / PCL ratio, the lower the value of transparency. The WVP value of PLA/PCL bionanocomposite films gives a lower value than the WVP value of pure PLA film and pure PCL film. The best WVP was obtained at a PLA/PCL ratio of 0.8/0.2 which was 1.49x10-16kg.m/(m2.s.Pa).

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Kassa, Amel, Aida Benhamida, Mustapha Kaci, and Stéphane Bruzaud. "Effects of montmorillonite, sepiolite, and halloysite clays on the morphology and properties of polycaprolactone bionanocomposites." Polymers and Polymer Composites 28, no. 5 (2019): 338–47. http://dx.doi.org/10.1177/0967391119877040.

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The article reports some experimental data on the effects of three types of clay: organo-modified montmorillonite (cloisite 30B (C30B)), sepiolite (SP9), and halloysite nanotubes (HNT) on the morphology and physicomechanical properties of polycaprolactone (PCL)/clays bionanocomposites prepared by melt compounding. The clays were incorporated separately into the PCL matrix at a loading rate of 5.00 wt%, which corresponds to 2.91 ± 0.53, 2.42 ± 0.02, and 2.68 ± 0.13 vol% for C30B, SP9, and HNT, respectively. Scanning electron microscopy analysis showed good dispersion of both C30B and SP9 in the polymer matrix, while the presence of a few HNT aggregates was observed on the fracture surface of the PCL bionanocomposite. Furthermore, the HNT aggregates were randomly dispersed. The results indicated an enhancement of the rheological and tensile properties of the PCL bionanocomposite samples filled with C30B and SP9 compared to those containing HNT. Indeed, it was shown an increase in Young’s modulus of PCL from 450 ± 16 MPa to 563 ± 42 MPa, 645 ± 68 MPa, and 502 ± 66 MPa for PCL bionanocomposites loaded with C30B, SP9, and HNT, respectively. On the other hand, the thermal stability of the whole PCL bionanocomposite samples was reduced being, however, more pronounced for those containing HNT. The decomposition temperature recorded at 5.00 wt% loss ( T 5%) indicated 384.7 ± 0.9 for neat PCL, while the PCL bionanocomposites filled with C30B, SP9, and HNT exhibited the values of 357.3 ± 0.5, 353.2 ± 0.9, and 368.4 ± 0.4, respectively.

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Shazleen, Siti Shazra, Fatimah Athiyah Sabaruddin, Yoshito Ando, and Hidayah Ariffin. "Optimization of Cellulose Nanofiber Loading and Processing Conditions during Melt Extrusion of Poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) Bionanocomposites." Polymers 15, no. 3 (2023): 671. http://dx.doi.org/10.3390/polym15030671.

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This present study optimized the cellulose nanofiber (CNF) loading and melt processing conditions of poly(3-hydroxybutyrate-co-3-hydroxyhexanoate) P(HB-co-11% HHx) bionanocomposite fabrication in twin screw extruder by using the response surface methodology (RSM). A face-centered central composite design (CCD) was applied to statistically specify the important parameters, namely CNF loading (1–9 wt.%), rotational speed (20–60 rpm), and temperature (135–175 °C), on the mechanical properties of the P(HB-co-11% HHx) bionanocomposites. The developed model reveals that CNF loading and temperature were the dominating parameters that enhanced the mechanical properties of the P(HB-co-11% HHx)/CNF bionanocomposites. The optimal CNF loading, rotational speed, and temperature for P(HB-co-11% HHx) bionanocomposite fabrication were 1.5 wt.%, 20 rpm, and 160 °C, respectively. The predicted tensile strength, flexural strength, and flexural modulus for these optimum conditions were 22.96 MPa, 33.91 MPa, and 1.02 GPa, respectively, with maximum desirability of 0.929. P(HB-co-11% HHx)/CNF bionanocomposites exhibited improved tensile strength, flexural strength, and modulus by 17, 6, and 20%, respectively, as compared to the neat P(HB-co-11% HHx). While the crystallinity of P(HB-co-11% HHx)/CNF bionanocomposites increased by 17% under the optimal fabrication conditions, the thermal stability of the P(HB-co-11% HHx)/CNF bionanocomposites was not significantly different from neat P(HB-co-11% HHx).

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Uddin, Md Nizam, Puttagounder S. Dhanasekaran, and Ramazan Asmatulu. "Mechanical properties of highly porous PEEK bionanocomposites incorporated with carbon and hydroxyapatite nanoparticles for scaffold applications." Progress in Biomaterials 8, no. 3 (2019): 211–21. http://dx.doi.org/10.1007/s40204-019-00123-1.

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Abstract Bone regeneration is of great importance worldwide, because of various bone diseases, such as infections, tumors, and resultant fracture, birth defects, and bone loss due to trauma, explosion, or accident. Bone regeneration can be achieved by several materials and templates manufactured through various fabrication techniques. Uses of different materials and scaffold fabrication techniques have been explored over the past 20 years. In this research, polyetheretherketone (PEEK) was used to fabricate highly porous bionanocomposite foams for bone scaffolding. Melt casting and salt porogen (200–500 µm size) leaching methods were adapted to create an adequate pore size and the necessary percent of porosity, because pore size plays a vital role in cell implantation and growth. Porosity (75% and 85%) of the prepared scaffolds was adjusted by changing salt concentrations in the PEEK powder. Hydroxyapatite (HA) and carbon particles were used to improve cell attachments and interactions with the porous PEEK and to increase the mechanical properties of the scaffold materials. Carbon fiber (CF) and carbon nanotubes (CNTs) were uniformly dispersed into the PEEK powder before melt casting to enhance the mechanical properties and to observe the influence of the carbon particles on the properties of PEEK bionanocomposite foam. Compression test results of the fabricated bionanocomposites showed that HA and carbon particles are the potential filler materials for the enhancement of bionanocomposite mechanical properties. About 186% enhancement of compression modulus and 43% enhancement of yield strength were observed while incorporating only 0.5 wt% of CNTs into PEEK/HA bionanocomposites having 75% porosity, compared to PEEK/HA 20 wt% bionanocomposites. Micro-computed tomography (micro-CT) test results reveal that pore size and interconnectivity of the nanocomposite foams are in order and within the designed sizes. Mechanical tests proved that PEEK bionanocomposite foam has the potential for use in bone scaffolding and other biomedical applications.

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Rizal, Samsul, E. M. Mistar, A. A. Oyekanmi, et al. "Propionic Anhydride Modification of Cellulosic Kenaf Fibre Enhancement with Bionanocarbon in Nanobiocomposites." Molecules 26, no. 14 (2021): 4248. http://dx.doi.org/10.3390/molecules26144248.

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The use of chemical modification of cellulosic fibre is applied in order to increase the hydrophobicity, hence improving the compatibility between the fibre and matrix bonding. In this study, the effect of propionic anhydride modification of kenaf fibre was investigated to determine the role of bionanocarbon from oil palm shell agricultural wastes in the improvement of the functional properties of bionanocomposites. The vinyl esters reinforced with unmodified and propionic anhydride modified kenaf fibres bio nanocomposites were prepared using 0, 1, 3, 5 wt% of bio-nanocarbon. Characterisation of the fabricated bionanocomposite was carried out using FESEM, TEM, FT-IR and TGA to investigate the morphological analysis, surface properties, functional and thermal analyses, respectively. Mechanical performance of bionanocomposites was evaluated according to standard methods. The chemical modification of cellulosic fibre with the incorporation of bionanocarbon in the matrix exhibited high enhancement of the tensile, flexural, and impact strengths, for approximately 63.91%, 49.61% and 54.82%, respectively. The morphological, structural and functional analyses revealed that better compatibility of the modified fibre–matrix interaction was achieved at 3% bionanocarbon loading, which indicated improved properties of the bionanocomposite. The nanocomposites exhibited high degradation temperature which signified good thermal stability properties. The improved properties of the bionanocomposite were attributed to the effect of the surface modification and bionanocarbon enhancement of the fibre–matrix networks.

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Râpă, Maria, Laura Mihaela Stefan, Traian Zaharescu, et al. "Development of Bionanocomposites Based on PLA, Collagen and AgNPs and Characterization of Their Stability and In Vitro Biocompatibility." Applied Sciences 10, no. 7 (2020): 2265. http://dx.doi.org/10.3390/app10072265.

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Bionanocomposites including poly(lactic acid) (PLA), collagen, and silver nanoparticles (AgNPs) were prepared as biocompatible and stable films. Thermal properties of the PLA-based bionanocomposites indicated an increase in the crystallinity of PLA plasticized due to a small quantity of AgNPs. The results on the stability study indicate the promising contribution of the AgNPs on the durability of PLA-based bionanocomposites. In vitro biocompatibility conducted on the mouse fibroblast cell line NCTC, clone 929, using the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay showed high values of cell viability (>80%) after cell cultivation in the presence of bionanocomposite formulations for 48 h, while the percentages of lactate dehydrogenase (LDH) released in the culture medium were reduced (<15%), indicating no damages of the cell membranes. In addition, cell cycle analysis assessed by flow cytometry indicated that all tested bionanocomposites did not affect cell proliferation and maintained the normal growth rate of cells. The obtained results recommend the potential use of PLA-based bionanocomposites for biomedical coatings.

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Debons, Nicolas, Kenta Matsumoto, Noriyuki Hirota, Thibaud Coradin, Toshiyuki Ikoma, and Carole Aimé. "Magnetic Field Alignment, a Perspective in the Engineering of Collagen-Silica Composite Biomaterials." Biomolecules 11, no. 5 (2021): 749. http://dx.doi.org/10.3390/biom11050749.

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Major progress in the field of regenerative medicine is expected from the design of artificial scaffolds that mimic both the structural and functional properties of the ECM. The bionanocomposites approach is particularly well fitted to meet this challenge as it can combine ECM-based matrices and colloidal carriers of biological cues that regulate cell behavior. Here we have prepared bionanocomposites under high magnetic field from tilapia fish scale collagen and multifunctional silica nanoparticles (SiNPs). We show that scaffolding cues (collagen), multiple display of signaling peptides (SiNPs) and control over the global structuration (magnetic field) can be combined into a unique bionanocomposite for the engineering of biomaterials with improved cell performances.

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Costa da Silva, Milena, Sara Verusca de Oliveira, and Edcleide Maria Araújo. "Structural and Thermomechanical Evaluation of Bionanocomposites Obtained from Biodegradable Polymers with a Organoclay." Materials Science Forum 775-776 (January 2014): 178–82. http://dx.doi.org/10.4028/www.scientific.net/msf.775-776.178.

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In this study bionanocomposites were prepared from biodegradable polymer matrices such as poly (lactic acid) (PLA) and PBAT/PLA blend commercially known as Ecovio®, with abundant smectite clays in Paraíba and modified (OMMT) with Praepagen quaternary ammonium salt. Systems with PLA and with the blends of PBAT/PLA were prepared with addition of bentonite clay at a concentration of 3wt.%. in a twin screw corrotational extruder. The systems containing PLA/OMMT and blend of PBAT/PLA/OMMT were characterized by X-ray diffraction (XRD) and Heat Deflection Temperature (HDT). From the diffractograms of bionanocomposites PLA/OMMT and PBAT/PLA/ OMMT it was observed a probably microcomposite structure. It was also observed that the HDT of PBA/PLA/OMMT and the blend of PBAT/PLA bionanocomposites was lower in relation to pure PLA and its PLA/OMMT bionanocomposite.

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Thèses sur le sujet "Bionanocompositi"

Iozzino, Valentina. "PLA-based bionanocomposites with modulated degradation rate: preparation and processing by microinjection molding." Doctoral thesis, Universita degli studi di Salerno, 2019. http://elea.unisa.it:8080/xmlui/handle/10556/4646.

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2016 - 2017 ... The aim of this work has been to obtain bionanocomposites with a degradation rate which can be modulated in time, so that it can be possible to decide a priori the time after which the material will disappear in a given environment. At the same time, the material should preserve its properties during processing. Several mixtures of PLA (4032D, 4060D) and LDH of cation composition Mg2Al organo-modified with organic acids (succinc, fumaric and ascorbic acid) have been obtained by extrusion. From the extruded materials there were obtained films by compression molding; these films were then subjected to hydrolysis tests. The experimental results show that for samples loaded with LDH-organic acid (in particular LDH-succinic acid), there is an increase in the time needed for degradation, and a decrease in this time for samples loaded with organic acid alone. From the selected material (PLA + LDH-succinic acid) and from pure PLA, biphasic samples (half amorphous and the other half crystalline) have been obtained by micro-injection molding. Also in this case, the experimental results show an increase for the loaded samples in the time needed for degradation compared to pure PLA both for the crystal phase and for the amorphous one, and in particular the presence of a degradation profile within the same sample is observed. [edited by Author] XVI n.s. (XXX ciclo)

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He, Jing. "Des (bio)nano-composites utilisés dans le traitement d'eaux contaminées par de l'arsenic/gentamicine ou pour des applications médicales." Phd thesis, Université de Grenoble, 2013. http://tel.archives-ouvertes.fr/tel-00988092.

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Les composés dits 'bionano' (bionanocomposites) apparaissent comme un nouveau groupe de matériaux hybrides nano-structurés. Ils sont issus de la combinaison de polymères naturels et de solides inorganiques et sont de l'ordre du nanomètre dans au moins une direction. Ces matériaux hybrides conservent les structures et les propriétés fonctionnelles des polymères et matériaux inorganiques dont ils sont composés. Parallèlement, la présence de biopolymères permet de diminuer les risques environnementaux et de santés publiques liés aux nano-matériaux. Les propriétés inhérentes aux biopolymères (biocompatibles' et biodégradables) ouvrent des perspectives intéressantes pour ces matériaux hybrides en particulier dans les domaines de la médecine regénérative et en génie de l'environnement. La production de bionanocomposites de taille plus importante, que les nanoparticules qu'ils renferment, permet d'éviter les effets nocifs potentiels des nanoparticules (NPs) pour les organismes vivants et plus particulièrement pour l'homme. L'association de biopolymères et de nano-solides inorganiques permet la conception de bionanocomposites multifonctionnels qui peuvent être synthétisés et utilisés pour des applications dans des domaines variés. Cette thèse se propose d'étudier principalement (i) ma présence d'arsenic et d'antibiotiques dans les sources d'eau potable en Chine; (ii) l'évaluation d'un nouveau bionanocomposites, à savoir le CGB (chitosan goethite bionanocomposite), dans la décontamination des eaux contenant des espèces inorganiques d'arsenic; (iii) l'évaluation d'argiles comme adsorbants de décontamination de la gentamicine (un antibiotique aminoglycoside ) présent dans l'eau de même que celle de bionanocomposés fait d'argiles riches en gentamicine de polymères de methycelluloses hydroxypropyles Gt-Mt-HPMC (gentamicin-montmorillonite- hydroxypropyl methycellulose) utilisés comme pansement contre les infections qui ont lieu suite à des brûlures.

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Belda, Marín Cristina. "Silk bionanocomposites : design, characterization and potential applications." Thesis, Compiègne, 2020. http://www.theses.fr/2020COMP2570.

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Les « bionanocomposites » à base de soie sont des matériaux qui suscitent un intérêt croissant dans de nombreuses applications, et en particulier dans le domaine biomédical, de par leur capacité à combiner les propriétés de la fibroïne (biodégradabilité, biocompatibilité et propriétés mécaniques intéressantes) et celles des nanoparticules (NP). L’objectif de ce travail est de (i) développer une méthode efficace, et « facile » à mettre en oeuvre, permettant l’élaboration de plusieurs types de bionanocomposites de soie ; (ii) fournir une caractérisation approfondie pour une meilleure compréhension de l’interface soie/NP ; et (iii) présenter des applications pertinentes en relation avec les propriétés spécifiques de ces bionanocomposites. Pour ce faire, les NP, d’or (Au NP), d’argent (Ag NP) et d’oxyde de fer (IONP) ont été utilisées en raison de leurs propriétés bien connues. L’élaboration de bionanocomposites à base de soie, tels que les tissus électrofilées, hydrogels, aérogels, éponges et structures imprimés en 3D est décrite. Une caractérisation approfondie, y compris des mesures in situ (pendant la formation du gel) et des analyses ex situ (une fois le gel formé), des hydrogels de soie montre qu’aucune différence significative n’est observée dans la structure de l’hydrogel, alors que la biocompatibilité des matériaux est préservée. Enfin, une application potentielle pour chaque « bionanocomposite » est présentée. Dans une perspective biomédicale, les hydrogels soie-Ag NP montrent une activité antibactérienne significative. Les hydrogels soie-IONP, implantés dans le cerveau d’un rat et suivis par imagerie de résonance magnétique (IRM), montrent l’induction d’une procédure de régénération du cerveau pendant au moins 3 mois. Dans une perspective liée à la dépollution, les hydrogels soie-Au NP montrent des performances remarquables dans la catalyse de la réaction de réduction du bleu de méthylène par le borohydrure de sodium Silk-based bionancompoistes have attracted a growing interest in numerous applications, particularly in the biomedical field, owing to their ability to combine the specific properties of silk fibroin (biodegradability, biocompatibility and interesting mechanical properties) and nanoparticles (NPs). This work aims to (i) develop a straightforward, yet efficient, methodology to design various silk bionanocomposite materials; (ii) provide an in-depth characterization regarding the silk/NPs interface and (iii) provide potential applications which are relevant for the use of these bionanocompoistes. To this end, gold (Au NPs), silver (Ag NPs) and iron oxide (IONPs) NPs are used as model nanomaterials due to their well-known properties. The successful design of silk bionancocomposite electrospun mats, hydrogels, cryogels, sponges and 3D printed structures is described. An in-depth characterization, including in situ (during hydrogel formation) and ex situ (once hydrogel is formed), of silk hydrogel bionanocomposites do not reveal any noticeable structural changes of silk hydrogels, while their biocompatibility is not impacted by the incorporation of NPs. Finally, a potential application for each bionanocomposite is presented. In a biomedical perspective, silk-Ag NPs hydrogels bionanocomposites show significant antibacterial activity. Silk-IONPs hydrogel bionanocomposites are implanted into rat’s brain allowing a good monitoring of the implant by magnetic resonance imaging and inducing a brain regeneration process up to 3 months. In depollution perspective, silk-Au NPs hydrogel bionanocomposites show remarkable ability to adsorb and catalyze the reduction of methylene blue dye by sodium borohydride

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Silva, Mariana Rodrigues Ferreira da. "Active and intelligent bionanocomposites for food packaging." Master's thesis, Universidade de Aveiro, 2017. http://hdl.handle.net/10773/22400.

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Mestrado em Biotecnologia A produção de plásticos, baseados no uso de combustíveis fósseis, está a aumentar e estima-se que esta tendência continuará no futuro com impactos ambientais consideráveis. Os bioplásticos são uma alternativa amiga do ambiente. Biopolímeros como quitosana já foram adotados com sucesso para produzir bioplásticos que agem como substitutos do plástico em embalagem. A quitosana foi selecionada devido às suas numerosas vantagens para embalagem alimentar, principalmente devido às suas atividades antioxidantes e antimicrobiana. Por outro lado, o dióxido de titânio foi selecionado como aditivo devido à sua capacidade de retirar oxigénio do ambiente e devido à possibilidade de poder ser facilmente funcionalizado para a formação de um sensor. Isto permitiria a formação de uma embalagem ativa e inteligente na proteção do alimento. Assim, nanopartículas homogéneas arredondadas e monofásicas de anatase de dióxido de titânio (TiO2) foram usadas para melhorar os filmes de quitosana, criando um bionanocompósito. Estas nanopartículas de TiO2 foram produzidas por síntese hidrotermal, tendo sido otimizadas as condições de síntese, como a temperatura e tempo, para selecionar as condições que originam as nanopartículas com as caraterísticas desejadas. As condições escolhidas para a produção do TiO2 foram 200 ºC e 2,5 h devido ao tamanho, dispersão e tipo de nanoparticulas de TiO2 produzidas. Os filmes de quitosana foram preparados com cerca de 9 mg de nanopartículas de TiO2. Para criar uma embalagem ativa e inteligente compostos fenólicos (principalmente antocianinas) de arroz preto (Oryza sativa L. Indica) foram adicionados para funcionalizar o TiO2 (4,1 mg de extrato por filme). Os filmes foram caracterizados em relação à sua atividade antioxidante, humidade, solubilidade, hidrofobicidade da superfície e propriedades mecânicas. Os melhores resultados foram obtidos nos filmes com nanopartículas e compostos fenólicos e foi demonstrado que a forma como cada componente é adicionado altera as suas propriedades. Os melhores resultados foram o aumento da atividade antioxidante, diminuição da solubilidade e da elasticidade, elongação e resistência à tração no filme composto por pigmento e TiO2,. No entanto nestes últimos três parâmetros, a sua diminuição pode ser um aspeto positivo ou negativo dependendo das propriedades desejadas para o filme e o produto alimentar a embalar Plastic production based in fossil fuels is rising, and predictions supports it continuous and enhanced use, with consequent environmental damage. Bioplastics are an environmentally friendly alternative. Biopolymers as chitosan have already been successfully used to produce bioplastics that act as plastic substitutes in packaging. Chitosan was chosen for its numerous advantages for food packaging namely due to its antioxidant and antimicrobial activities. On the other hand, TiO2 was selected due to its oxygen scavenging ability and due to its possibility to be easily functionalised to create a sensor. This would allow the construction of an active and intelligent packaging for food protection. Thus, monophasic anatase homogeneous round-shaped nanoparticles of titanium dioxide (TiO2) were used as filler to improve the chitosan films, creating a bionanocomposite. These TiO2 nanoparticles were produced via a hydrothermal method and its synthesis was optimized testing various reaction times and temperatures to find the conditions that create TiO2 nanoparticles with the desired features. The conditions used for the chosen TiO2 were 200 ºC and 2.5 h due to the size, dispersion and TiO2 of the nanoparticles produced. The chitosan films were prepared with about 9 mg of TiO2 nanoparticles. To develop an active and intelligent food packaging, phenolic compounds (mainly anthocyanins) from black rice (Oryza sativa L. Indica) were used to functionalise the TiO2 (4.1 mg of extract in each film). The films were characterised regarding its antioxidant activity, humidity, solubility, surface hydrophilicity and mechanical properties. The best results were from films with both nanoparticles and phenolic compounds, and it was established that the order in which they are added alters its properties. The more notable improvements are an increase in antioxidant activity and a decrease in solubility, elasticity, elongation and tensile strength in the film containing pigment and TiO2. However, the reduction of the later three properties can either be positive or negative, it depends on desired properties for the film for a chosen food product

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Nechyporchuk, Oleksandr. "Nanofibres de cellulose pour la production de bionanocomposites." Thesis, Université Grenoble Alpes (ComUE), 2015. http://www.theses.fr/2015GREAI056/document.

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Un des principaux challenges dans le contexte du développement des matériaux biocomposites est de remplacer les matières plastiques à base de pétrole par des matériaux biosourcés. En raison de leurs origines naturelles, d'une résistance relativement élevée et de leur capacité à former des produits transparents, les nanofibres de cellulose possèdent un grand potentiel d'applications dans les matériaux composites. Dans ce travail des résultats ont été apportés premièrement sur l'optimisation des procédés de productions de nanofibres de cellulose par des traitements biochimiques et mécaniques, deuxièmement sur leurs propriétés rhéologiques et structurelles en milieu aqueux et troisièmement sur la production de composites à matrice de latex. Les questions de dispersions homogènes de nanofibres de cellulose dans la matrice et des interactions entre ces composants à des fins de renforcement des bio-composites ont été étudiés en détails One of the main challenges in the context of biocomposites development is to replace petroleum-based materials with bio-based. Because of their natural origin, relatively high strength and the ability to form transparent products, cellulose nanofibers have a large potential for application in the composite materials. This work was focused primarily on the optimization of cellulose nanofiber production methods using biochemical and mechanical treatments, secondly on their rheological and structural properties in an aqueous medium and thirdly on the production of latex-based composites. The questions of homogeneous dispersion of cellulose nanofibers in the matrix and the interactions between these components for the purpose of matrix reinforcement are particularly addressed

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Mousa, Mohanad Hashim. "Experimental Characterisation and Modelling of Sustainable Multiscaled Bionanocomposites." Thesis, Curtin University, 2018. http://hdl.handle.net/20.500.11937/75691.

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Novel polyvinyl (PVA) bionanocomposite films reinforced with four different types of nanofillers were manufactured based on a solution casting method. The effect of nanofiller size, shape and content on the material performance of bionanocomposites was holistically investigated in experimental characterisation. Furthermore, nanomechanical properties and dimensions of nanointerphases in PVA bionanocomposites were systematically determined via peak force quantitative nanomechanical tapping mode (PFQNM). Finally, newly developed micromechanical modelling results confirmed good agreement with experimental data.

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Piazzolla, Caterina. "Study of plasticised PLA based bionanocomposites reinforced with nanofibrillated cellulose." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021.

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In this study polylactide (PLA)-based nanocomposites plasticised with poly(ethylene glycol) (PEG) and nanofibrillated cellulose (NFC) were evaluated. Their physico-chemical properties were assessed by field emission scanning electron microscopy (FE-SEM), gel permeation cromatography (GPC), tensile testing machine, thermo-gravimetric analysis (TGA) and differential scanning calorimetry (DSC). The effect of PEG with molecular weight of 400 g·mol-1 and 1500 g·mol-1 (PEG-400 and PEG-1500) and the influence of nanofibrillated cellulose (NFC) with different concentration (0, 1, 3, 5 wt%) on the polylactide, were analysed. No pores or cracks were observed in the evaluation of the cryo-fracture surface, suggesting an adequate processing strategy. The study of molar mass variation revealed that the additional processing step for the blends and composites promoted slight chain scission of PLA. The addition of NFC provoked a slight decrease in molar mass possibly due to the shear effects caused by the presence of nanofibrils during processing. With the incorporation of PEG-1500, the tensile strength and modulus decreased, whereas the elongation at break increased by 70%. Further, the nanocomposites showed increased rigidity and lower tensile strength in comparison to the blends. The microscopic evaluation of the fracture surface after tensile test suggested the possible agglomeration of NFC as the cause for this behaviour, especially for high NFC contents. The study of the thermal and thermo-oxidative stability highlighted the presence of PEG, as it decomposed at lower temperatures than the PLA. Finally, the presence of PEG decreased the glass transition temperature and the degree of crystallinity. Complementarily, the addition of NFC nanoparticles increased the PLA crystallinity due to its nucleation effects. This behaviour occurred for NFC contents between 1 and 3% wt., which suggested feasible nanoparticle agglomeration for higher concentrations.

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Vassalli, J. Todd Grant Sheila Ann. "Development of electrospun synthetic bioabsorbable fibers for a novel bionanocomposite hernia repair material." Diss., Columbia, Mo. : University of Missouri--Columbia, 2008. http://hdl.handle.net/10355/5631.

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The entire thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file; a non-technical public abstract appears in the public.pdf file. Title from PDF of title page (University of Missouri--Columbia, viewed on October 6, 2009). Thesis advisor: Dr. Sheila Grant, Includes bibliographical references.

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Bettini, Giacomo. "Bionanocomposites based on Plla, Pcl and montmorillonite: synthesis, characterization and crystallization." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amslaurea.unibo.it/10025/.

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Poly(lactide) is one of the best candidate to replace conventional petroleum-based polymers, since it is biobased, biocompatible and biodegradable. However, commercial PLA materials typically have low crystallization rate resulting in long processing time and low production efficiency. In this work the effects of two nanofillers MMT30B and MMT30B-g-P(LA-co-CL) on the crystallization rate of neat PLA and PLA/PCL blend were investigated. MMT30B-g-P(LA-co-CL) was synthetized by in situ grafting reaction. The synthesis was carried in xylene at 140°C, upon the results of a screening. The grafted copolymers were evaluated by 1H-NMR ,ATR–IR and TGA. Solvent casted films were obtained by mixing MMT30B-g-P(LA-co-CL) at 5% (w/w) with neat PLA and PLA/PCL blend, comparing the properties with the corresponding blends with and without a 5% of (w/w) unmodified clay. SEM images on PLA based blends shows that MMT30B is aggregated into larger particles compared to MMT30B-g-P(LLA-co-CL). This behavior is correlated to the better exfoliation of MMT30B-g-P(LA-co-CL) clay layers. SEM images on PLA/PCL based blends exhibit the typical sea-island morphology, characteristic of immiscible blends. PLA is the matrix while PCL is finely dispersed in droplets. MMT30B does not reduce PCL droplets size, while MMT30B-g-P(LA-co-CL) reduces the size of PCL droplets. This means that MMT30B-g-P(LA-co-CL) can migrate to the PLA-PCL interface, acting as a compatibilizer. Non-isothermal DSC cooling scans show a fractionated crystallization of the PCL phase in PLA/PCL/MMT30B-g-P(LA-co-CL), confirming the compatibilizer effect of MMT30B-g-P(LA-co-CL). At the same timeMMT30B-g-P(LA-co-CL) can better nucleate the PLA phase, both in neat PLA and PLA/PCL blend, promoting the crystallization during the heating scans. In isothermal condition, both the nanofillers increase the crystallization rate of PLA phase in neat PLA, while in PLA/PCL blends the effect is covered by the nucleating effect of PCL.

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Touati, Souad. "Elaboration d'aérogels d'hydroxydes doubles lamellaires et de bionanocomposites à base d'alginate." Phd thesis, Université Blaise Pascal - Clermont-Ferrand II, 2013. http://tel.archives-ouvertes.fr/tel-00975932.

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Cette thèse présente un travail sur l'obtention d'aérogels d'HDL par séchage en conditions CO2 supercritique et l'élaboration de nouveaux bionanocomposites formés par la coprécipitation d'hydroxydes doubles lamellaire (HDL) dans l'espace confiné des billes d'alginate. Grâce à la combinaison d'une synthèse par coprécipitation Flash et d'un séchage en conditions supercritiques au CO2, des aérogels d'HDL possédant des surfaces spécifiques élevées sont élaborés. Parallèlement, l'alginate est utilisé comme une matrice de confinement pour la précipitation inorganique d'HDL. D'une part, les billes d'alginate sont synthétisées par complexation des ions Ca2+ et la coprécipitation des phases HDL s'effectue en réalisant des imprégnations successives de réactifs. D'autre part, des billes d'alginate sont formées directement en présence des cations divalents (Mg2+, Ni2++, Co2+, ...) et des cations des métaux trivalents (Al3+), précurseurs des composés inorganiques. La coprécipitation des HDL se produit dans ce cas lors d'une étape d'imprégnation dans une solution d'hydroxyde de sodium. Tous les composés HDL, aérogels ou encore bionanocomposites sont caractérisés en détail par DRX, spectroscopie IR, MEB/MET, adsorption/désorption d'azote et ATG/DTG, pour obtenir un meilleur aperçu de la structure des particules, de leur taille et de leur morphologie. Des études menées sur l'adsorption de la trypsine pour les aérogels ou encore sur les performances d'électrodes modifiées HDL-alginate ont permis de montrer qu'il était possible d'améliorer les performances des HDL en augmenter leur porosité et en élaborant des bionanocomposites.

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Plus de sources

Livres sur le sujet "Bionanocompositi"

Aimé, Carole, and Thibaud Coradin, eds. Bionanocomposites. John Wiley & Sons, Inc., 2017. http://dx.doi.org/10.1002/9781118942246.

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Mousa, Mohanad, and Yu Dong. Multiscaled PVA Bionanocomposite Films. Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-15-8771-9.

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Visakh P. M., ed. Rubber Based Bionanocomposites. Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-48806-6.

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Jawaid, Mohammad, and Sarat Kumar Swain, eds. Bionanocomposites for Packaging Applications. Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-67319-6.

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Visakh, P. M., and Matheus Poletto, eds. Polypropylene-Based Biocomposites and Bionanocomposites. John Wiley & Sons, Inc., 2018. http://dx.doi.org/10.1002/9781119283621.

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Visakh, P. M., and Sigrid Lüftl, eds. Polyethylene-Based Biocomposites and Bionanocomposites. John Wiley & Sons, Inc., 2016. http://dx.doi.org/10.1002/9781119038467.

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Visakh P. M., ed. Biodegradable and Environmental Applications of Bionanocomposites. Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-13343-5.

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Abdullah, Zainab Waheed, and Yu Dong. Polyvinyl Alcohol/Halloysite Nanotube Bionanocomposites as Biodegradable Packaging Materials. Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-7356-9.

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Bionanocomposites. Elsevier, 2020. http://dx.doi.org/10.1016/c2017-0-04398-7.

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Ahmed, Shakeel. Handbook of Bionanocomposites. Pan Stanford, 2018. http://dx.doi.org/10.1201/9781351170680.

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Chapitres de livres sur le sujet "Bionanocompositi"

Medeiros, Eliton S., Amélia S. F. Santos, Alain Dufresne, William J. Orts, and Luiz H. C. Mattoso. "Bionanocomposites." In Polymer Composites. Wiley-VCH Verlag GmbH & Co. KGaA, 2013. http://dx.doi.org/10.1002/9783527674220.ch11.

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Urvoas, Agathe, Marie Valerio-Lepiniec, Philippe Minard, and Cordt Zollfrank. "What Are Bionanocomposites?" In Bionanocomposites. John Wiley & Sons, Inc., 2017. http://dx.doi.org/10.1002/9781118942246.ch1.

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Prado, Enora, Mónika Ádok-Sipiczki, and Corinne Nardin. "Nucleic Acids." In Bionanocomposites. John Wiley & Sons, Inc., 2017. http://dx.doi.org/10.1002/9781118942246.ch2.1.

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Aimé, Carole, and Thibaud Coradin. "Lipids." In Bionanocomposites. John Wiley & Sons, Inc., 2017. http://dx.doi.org/10.1002/9781118942246.ch2.2.

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Czjzek, Mirjam. "Carbohydrates." In Bionanocomposites. John Wiley & Sons, Inc., 2017. http://dx.doi.org/10.1002/9781118942246.ch2.3.

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Romero, Stéphane, and François-Xavier Campbell-Valois. "Proteins." In Bionanocomposites. John Wiley & Sons, Inc., 2017. http://dx.doi.org/10.1002/9781118942246.ch2.4.

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Prado, Enora, Mónika Ádok-Sipiczki, and Corinne Nardin. "Nucleic Acid Engineering." In Bionanocomposites. John Wiley & Sons, Inc., 2017. http://dx.doi.org/10.1002/9781118942246.ch3.1.

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Urvoas, Agathe, Marie Valerio-Lepiniec, and Philippe Minard. "Protein Engineering." In Bionanocomposites. John Wiley & Sons, Inc., 2017. http://dx.doi.org/10.1002/9781118942246.ch3.2.

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Aimé, Carole, and Thibaud Coradin. "Inorganic Nanoparticles." In Bionanocomposites. John Wiley & Sons, Inc., 2017. http://dx.doi.org/10.1002/9781118942246.ch4.1.

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Knežević, Nikola Ž., Laurence Raehm, and Jean-Olivier Durand. "Hybrid Particles." In Bionanocomposites. John Wiley & Sons, Inc., 2017. http://dx.doi.org/10.1002/9781118942246.ch4.2.

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Actes de conférences sur le sujet "Bionanocompositi"

Zubair, Muhammad, Aman Ullah, and Jianping Wu. "Spent hen proteins: An untapped bioresource for food packaging applications." In 2022 AOCS Annual Meeting & Expo. American Oil Chemists' Society (AOCS), 2022. http://dx.doi.org/10.21748/wasw9203.

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Spent hens, a poultry by-product, have little economic value for processing due to poor meat quality and low yield. In North America alone, 150 million spent hens are produced every year which are either end up in landfill or burnt. However, there are concerns over disposal of spent hens; therefore, it is pertinent to find out alternative uses that are environmentally friendly. On the other hand, single-use plastic packaging is leading to a global environmental crisis. The development of hybrid bionanocomposite films from spent hen proteins using cellulose nanocrystals (CNCs) is a viable option for food packaging applications. In this study, proteins were harvested from spent hen using alkali aided extraction method. To develop protein derived bionanocomposite films, glycerol was used as a plasticizer and chitosan as a cross-linker agent. Furthermore, cellulose nanocrystals (1,3,5%) were incorporated into the proteins/glycerol/chitosan mixture and sonicated it for an hour. Finally, mixture was transformed into food packaging films using compression molding and characterized using FTIR, XRD, TEM, DMA, DSC and TGA.The results indicated that alkali aided method provided excellent proteins recovery yield (74%) and percentage purity (96%) from spent hen. The physicochemical analysis showed an improvement in the thermal, mechanical, and barrier properties of the prepared bionanocomposite films. A greater enhancement in mechanical strength (2.65± 0.50 to 8.48±0.98 MPa) of CNCs derived films was observed as compared to films without nanoparticles. Transmission electron microscopy images confirmed the dispersion of CNCs into the protein polymeric chains which resulted in good exfoliation/intercalation of CNCs and improved the overall properties of the films.The above results suggested that spent hen proteins have great future potential to develop protein/CNCs hybrid bionanocomposite films with improved functional properties for food packaging applications. The petro-based plastic environmental impacts can be reduced with the development of these environmentally benign bionanocomposite films.

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Kalendova, Alena, Jiri Smotek, Petr Stloukal, Milan Kracalik, Miroslav Slouf, and Stephan Laske. "PLA based bionanocomposites and their transport properties." In 9TH INTERNATIONAL CONFERENCE ON “TIMES OF POLYMERS AND COMPOSITES”: From Aerospace to Nanotechnology. Author(s), 2018. http://dx.doi.org/10.1063/1.5045933.

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Hsu, Po-Yen, Jing-Jenn Lin, Jheng-Jia Jhuang, and You-Lin Wu. "Nano-scale leakage characterizations of the γ-APTES/ silica nanoparticles bionanocomposite." In 2011 International Conference of Electron Devices and Solid-State Circuits (EDSSC). IEEE, 2011. http://dx.doi.org/10.1109/edssc.2011.6117608.

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"Bionanocomposite Bamboo: A Regioselective Impregnation with Silver Nanofillers for Antifungal Application." In Non-Conventional Materials and Technologies. Materials Research Forum LLC, 2018. http://dx.doi.org/10.21741/9781945291838-39.

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Sharma, Aashish, G. S. Josan, N. P. Raju, and A. K. Sharma. "Predicting Sorption Behavior in Edible Bionanocomposite Films with Machine Learning Algorithms." In 2022 3rd International Conference on Computing, Analytics and Networks (ICAN). IEEE, 2022. http://dx.doi.org/10.1109/ican56228.2022.10007135.

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Aranda, Pilar, Ana C. S. Alcântara, Ligia N. M. Ribeiro, Margarita Darder, and Eduardo Ruiz-Hitzky. "Bionanocomposites based on layered double hydroxides as drug delivery systems." In SPIE Nanosystems in Engineering + Medicine, edited by Sang H. Choi, Jin-Ho Choy, Uhn Lee, and Vijay K. Varadan. SPIE, 2012. http://dx.doi.org/10.1117/12.2008317.

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Adedoyin, A. A., R. Kumar, S. Sridhar, and A. K. Ekenseair. "Injectable bionanocomposite hybrid scaffolds with responsive control for enhanced osteochondral tissue regeneration." In 2015 41st Annual Northeast Biomedical Engineering Conference (NEBEC). IEEE, 2015. http://dx.doi.org/10.1109/nebec.2015.7117047.

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"Moringa oleifera Seeds Extracts / Magnetite based Bionanocomposites for Hexavalent chromium Uptake." In Nov. 18-19, 2019 Johannesburg (South Africa). Eminent Association of Pioneers, 2019. http://dx.doi.org/10.17758/eares8.eap1119247.

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Dolbanosova, Rimma V., Valeriy B. Loboda, Tatyana O. Chernyavska, et al. "A New Method for Determining the Quality of Bionanocomposite Layers of Chicken Eggshells." In 2021 IEEE 11th International Conference Nanomaterials: Applications & Properties (NAP). IEEE, 2021. http://dx.doi.org/10.1109/nap51885.2021.9568392.

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Pilon, Andrea, Ahmed Touny, Joseph Lawrence, and Sarit Bhaduri. "Electrospun Poly(lactic acid) (PLA)/Calcium Phosphate Cement (CPC) Bionanocomposite for Bone Tissue Engineering Applications." In SAE 2010 World Congress & Exhibition. SAE International, 2010. http://dx.doi.org/10.4271/2010-01-0423.

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