Relevant bibliographies by topics / Biodegradable nanocomposites

Academic literature on the topic 'Biodegradable nanocomposites'

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Published: 4 June 2021
Last updated: 2 February 2022

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Journal articles on the topic "Biodegradable nanocomposites"

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Abdullah, Abu Hannifa, Kamal Yusoh, Mohamad Faiz Mohamed Yatim, Siti Amirah Nor Effendi, and Wan Siti Noorhashimah W. Kamaruzaman. "Characterization Copper (II) Chloride Modified Montmorillonite filled PLA Nanocomposites." Advanced Materials Research 858 (November 2013): 13–18. http://dx.doi.org/10.4028/www.scientific.net/amr.858.13.

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The thermal behaviour of polymer layered silicate nanocomposite were characterised to compare the improvement of the nanocomposite with the pristine polymer. It is known that pristine polymers have some weakness in its thermal properties especially biodegradable polymers. The approach of making the nanocomposite out of modified layered silicate and biodegradable polymer is to enhance the thermal behaviour of the biodegradable polymer. The nanocomposites were produced by solution method technique using dichloromethane as a solvent and the two types of nanoclay were used. One was modified with transition metal ion and another type of nanoclay is pristine nanoclay. Wide angle X-ray diffraction (XRD) was used to characterise the structure of the nanoclay after the modification and the type of nanocomposite obtained. Melting temperature and degradation temperature of the nanocomposite were obtained by using differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) respectively. Decrease in both thermal degradation temperature and melting temperature of the nanocomposites were observed.
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Wong, Ka Wai, Xing Hua Li, Novem C. Y. Lam, and Kimmy Mui Chan. "Luminous Chitosan-Dye Nanocomposite Particles with Enhanced Lifetime and Stability." Materials Science Forum 722 (June 2012): 87–93. http://dx.doi.org/10.4028/www.scientific.net/msf.722.87.

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Nanoparticular chitosan-dye nanocomposites were prepared by a facile ionotropic gelation, which show a much improved stability against UV and ozone attack. The nanocomposites do not contain any toxic material. Also, as natural occurring biopolymeric chitosan is used as the matrix material, the nanocomposite is biocompatible and biodegradable with high bioaffinity. After suitable bioconjugation, the developed luminous chitosan-dye nanocomposites can be used as target biolabels in various medical and biomedical applications.
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Nayak, S. K. "Biodegradable PBAT/Starch Nanocomposites." Polymer-Plastics Technology and Engineering 49, no. 14 (November 23, 2010): 1406–18. http://dx.doi.org/10.1080/03602559.2010.496397.

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Sinha Ray, Suprakas, Kazunobu Yamada, Masami Okamoto, and Kazue Ueda. "Biodegradable Polylactide/Montmorillonite Nanocomposites." Journal of Nanoscience and Nanotechnology 3, no. 6 (December 1, 2003): 503–10. http://dx.doi.org/10.1166/jnn.2003.220.

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Punte, G., A. E. Bianchi, I. L. Torriani, P. Eisenberg, A. Botana, M. Mollo, and R. M. T. Sanchez. "Biodegradable polymer-clay nanocomposites." Acta Crystallographica Section A Foundations of Crystallography 67, a1 (August 22, 2011): C681—C682. http://dx.doi.org/10.1107/s0108767311082754.

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Rouf, Tahrima B., and Jozef L. Kokini. "Biodegradable biopolymer–graphene nanocomposites." Journal of Materials Science 51, no. 22 (August 8, 2016): 9915–45. http://dx.doi.org/10.1007/s10853-016-0238-4.

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Wang, Bing Tao, Yan Zhang, and Zheng Ping Fang. "Synthesis and Characterization of Biodegradable Aliphatic-Aromatic Copolyesters Nanocomposites Containing POSS." Advanced Materials Research 236-238 (May 2011): 2028–31. http://dx.doi.org/10.4028/www.scientific.net/amr.236-238.2028.

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Biodegradable aliphatic-aromatic copolyesters/POSS nanocomposites were synthesized via in situ melt copolycondensation of terephthalic acid (TPA), poly(L-lactic acid) oligomer (OLLA), 1,4-butanediol (BDO) and polyhedral oligomeric silsesquioxanes (POSS) reagents (POSS-NH2 and POSS-PEG). The morphologies and dispersions of two POSS reagents in the nanocomposites and their effects on the mechanical and thermal properties were investigated. TEM and XRD characterizations confirmed that POSS-NH2 formed crystalline microaggregates and took poor dispersions in the nanocomposite, while POSS-PEG had better dispersion in the matrix. Due to the good dispersion and interfacial adhesion of POSS-PEG with the copolyester PBTL matrix, the tensile strength and the Young’s modulus greatly increased for PBTL/POSS-PEG nanocomposite. Moreover, compared with POSS-NH2 the existence of POSS-PEG imparted PBTL good flexibility and increased the mobility of the chains, so the glass-transition temperature and the heat of melting as well as the elongation at break were obviously influenced for PBTL/POSS-PEG nanocomposite.
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Park, Ji Soon, Ji Won Rhim, Jae Sik Na, and Sang Yong Nam. "Preparation of Properties of Biodegradable Membranes Using Natural Polymer/Clay Nanocomposite for the Application of Dehumidification." Materials Science Forum 544-545 (May 2007): 805–8. http://dx.doi.org/10.4028/www.scientific.net/msf.544-545.805.

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Biodegradable chitosan/clay nanocomposite membranes were prepared by solution casting method for the application of dehumidification. The cationic biopolymer, chitosan was intercalated into clay through cationic exchange and hydrogen bonding process. Diluted acetic acid was used as a solvent for dissolving and dispersing chitosan into clays. Chitosan was successfully intercalated into clay and it was confirmed by X-ray diffraction method. Thermal stability and the mechanical properties of the nanocomposites are characterized by TGA and Universal Testing Machine. Thermal stability and mechanical properties were enhanced by increasing clay contents in chitosan/clay nanocomposites. Gas permeation and water vapor permeation properties of the nanocomposites were measured by time-lag methods. Permeability of N2 gas and water vapor through chitosan/clay nanocomposite membranes decreased when the content of clay in the nanocomposite increased.
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Paramith, Tika, Johnner P Sitompul, and Hyung Woo Lee. "The effect of organobentonites from spent bleaching earth (SBE) and commercial bentonite on nanocomposite properties." International Journal of Engineering & Technology 7, no. 4 (September 5, 2018): 2000. http://dx.doi.org/10.14419/ijet.v7i4.15317.

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This paper concerns on synthesis of nanocomposites consisting of Poly(lactic acid) (PLA) and clays. Two types of clays were regenerated organobentonite and commercial organobentonite. PLA and clays were melt extruded using single-screw extruder. The extruded compound was pelletized, then hot pressed using compression molding machine. Regenerated organobentonite was obtained from regeneration of spent bleaching earth (SBE) using solvent extraction and oxidation method. Afterwards, regenerated SBE modified by organic compound. While, commercial organobentonite was directly modified of commercial bentonite using organic compound. In this study, nanocomposites were prepared with varying compositions of clays from 0% to 5% (by weight). Experimental results show that partially exfoliated nanocomposites structure was shown by X-ray diffraction analyses. In addition, the effect of clays on morphology structure, mechanical, barrier, and biodegradable properties were analyzed. The utilization of clays in nanocomposite increases mechanical properties at low clay compositions. Furthermore, PLA-clay nanocomposites show better barrier and biodegradable properties compared to that of the neat PLA.
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Chen, Na Li, Hui Xia Feng, He Ming Luo, Dan Zhao, and Jian Hui Qiu. "Biodegradable Poly(Lactic Acid)/Organic-Montmorillonite Nanocomposites: Preparation and Characterization." Advanced Materials Research 87-88 (December 2009): 422–26. http://dx.doi.org/10.4028/www.scientific.net/amr.87-88.422.

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In this work, the biodegradable poly(lactic acid) (PLA)/organic-montmorillonite (O-MMT) nanocomposites were successfully prepared by the in situ polymerization intercalation process of D,L-lactide with organically-modified montmorillonite which was first treated by Cu cations and second treated by n-hexadecyl trimethylammonium bromide (CTAB) cations. O-MMT was characterized by FT-IR and XRD, the results showed that Cu cations and CTAB cations had been inserted to the interlayer of MMT, and the interlayer spacing of CTAB-Cu-MMT (O-MMT) increased by 1.829nm. The biodegradable PLA/O-MMT nanocomposites were characterized by XRD, SEM, FT-IR, TG, and the results showed that silicate layers were intercalated into the PLA matrix and the biodegradable PLA/O-MMT nanocomposites were of two different types: intercalated nanocomposites and exfoliated nanocomposites. This new nanocomposites frequently exhibited remarkable improvements when compared with the neat PLA matrix. Improvements could include increased heat distortion temperature, an increase in the biodegradability rate of biodegradable polymers.
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Dissertations / Theses on the topic "Biodegradable nanocomposites"

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Aydin, Erkin. "Biodegradable Polymer - Hydroxyapatite Nanocomposites For Bone Plate Applications." Phd thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12612252/index.pdf.

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Long bone fractures are fixed with bone plates to restrain movement of bone fragments. Fracture site must experience some pressure for proper healing. Bone plates are mostly made up of metals having 5 - 10 times higher elastic modulus than bones and most of the load is carried by them, leading to stress shielding and a bony tissue with low mineral density and strength. To avoid these problems, biodegradable polymer-based composite plates were designed and tested in this study. Poly(L-lactide) and Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) biodegradable polymer composite fibers containing hydroxyapatite (HAP) nanoparticles were produced by extrusion and spinning techniques to reinforce the polymeric bone plates. The composite fibers were expected to mimic the natural organization of bone so that HAP nanorods aligned parallel to the loading axis of bone plate. Also, lactic acid was grafted on HAP surfaces and had a positive effect on the mechanical properties of the PLLA composites. A 50% (w/w) HAP nanoparticle content was found to increase tensile modulus value (4.12 GPa) ca. 2.35 times compared to the pure polymeric fiber with a reduction to one third of the original UTS (to 50.4 MPa). The fibers prepared were introduced to polymeric plates with their long axes parallel. Fiber reinforced bone plates were compression tested longitudinally and up to a 4% increase in the Young&rsquo
s Modulus was observed. Although this increase was not high was not high probably due to the low fiber content in the final plates, this approach was found to be promising for the production of biodegradable polymeric bone plates with mechanical values closer to that of cortical bones. Biological compatibility of fibers was validated with in vitro testing. The osteoblasts attached and spread on the fibers indicating that bone fractures fixed with these could attract of bone forming osteoblasts into defect area and help speed up healing.
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Li, Yonghui. "Biodegradable poly(lactic acid) nanocomposites: synthesis and characterization." Diss., Kansas State University, 2011. http://hdl.handle.net/2097/8543.

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Doctor of Philosophy
Department of Grain Science and Industry
X. Susan Sun
Biobased polymers derived from renewable resources are increasingly important due to acute concerns about the environmental issues and limited petroleum resources. Poly(lactic acid) (PLA) is such a polymer that has shown great potential to produce biodegradable plastics. However, low glass transition temperature (Tg), low thermal stability, slow biodegradation rate, and high cost limit its broad applications. This dissertation seeks to overcome these limitations by reinforcing PLA with inorganic nanoparticles and low-cost agricultural residues. We first synthesized PLA nanocomposites by in situ melt polycondensation of L-lactic acid and surface-hydroxylized nanoparticles (MgO nanocrystals and TiO2 nanowires) and investigated the structure-property relationships. PLA grafted nanoparticles (PLA-g-MgO, PLA-g-TiO2) were isolated from the bulk nanocomposites via repeated dispersion/centrifugation processes. The covalent grafting of PLA chains onto nanoparticle surface was confirmed by Fourier transform infrared spectroscopy and thermalgravimetric analysis (TGA). Transmission electron microscopy and differential scanning calorimetry (DSC) results also sustained the presence of the third phase. Morphological images showed uniform dispersion of nanoparticles in the PLA matrix and demonstrated a strong interfacial interaction between them. Calculation based on TGA revealed that more than 42.5% PLA was successfully grafted into PLA-g-MgO and more than 30% was grafted into PLA-g-TiO2. Those grafted PLA chains exhibited significantly increased thermal stability. The Tg of PLA-g-TiO2 was improved by 7 °C compared with that of pure PLA. We also reinforced PLA with low-value agricultural residues, including wood flour (WF), soy flour (SF), and distillers dried grains with solubles (DDGS) by thermal blending. Tensile measurements and morphological images indicated that methylene diphenyl diisocyanate (MDI) was an effective coupling agent for PLA/WF and PLA/DDGS systems. MDI compatibilized PLA/WF and PLA/DDGS composites showed comparable tensile strength and elongation at break as pure PLA, with obviously increased Young’s modulus. Increased crystallinity was observed for PLA composites with SF and DDGS. Such PLA composites have similar or superior properties compared with pure PLA, especially at a lower cost and higher biodegradation rate than pure PLA. The results from this study are promising. These novel PLA thermoplastic composites with enhanced properties have potential for many applications, such as packaging materials, textiles, appliance components, autoparts, and medical implants.
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Saxena, Amit. "Nanocomposites based on nanocellulose whiskers." Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/47524.

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Environmental concerns arising from the use of non-degradable plastics have resulted in search for suitable substitutes. The thesis deals with new nanostructured composites based on reinforcement of nanocellulose whiskers in "green" polymers such as xylan. Since the reinforcement filler and the matrix are both biobased and are thereby environmental friendly. Xylan incorporated with cellulose whiskers films provided with improved water and oxygen barrier properties. It appears that the high degree of crystallinity of cellulose whiskers, dense composite structure formed by the whiskers and rigidly hydrogen-bonded cellulose whiskers can cause cellulose whiskers to form integrated matrix which contribute to substantial benefit in the overall reduction of transmission rate. The spectral data obtained for the NCW/xylan nanocomposite films showed that the amount of xylan adsorbed to cellulose increases with the addition of NCW in the matrix. In addition, NMR T2 relaxation experiments studies were conducted to investigate the change in the nature of carbohydrate-water interactions as a result of NCW incorporation. These results facilitated an improved understanding of the mechanisms involved in the superior barrier and mechanical properties of xylan-whisker nanocomposite films. XRD studies show that when a xylan-whisker nanocomposite films is formed the mixing occurs on the atomic scale and NCW loading increases the matrix crystallinity.
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Bhatia, Amita, and abhatia78@yahoo com. "Experimental Study of Structure and Barrier Properties of Biodegradable Nanocomposites." RMIT University. Civil, Environmental and Chemical Engineering, 2008. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20090304.143545.

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As nanocomposites provide considerable improvements in material properties, scientists and engineers are focussing on biodegradable nanocomposites having superior material properties as well as degradability. This thesis has investigated the properties of biodegradable nanocomposites of the aliphatic thermoplastic polyester, poly (lactide acid) (PLA) and the synthetic biodegradable polyester, poly (butylene succinate) (PBS). To enhance the properties of this blend, nanometer-sized clay particles, have been added to produce tertiary nanocomposite. High aspect ratio and surface area of clay provide significant improvement in structural, mechanical, thermal and barrier properties in comparison to the base polymer. In this study, a series of PLA/PBS/layered silicate nanocomposites were produced by using a simple twin-screw extruder. PLA/PBS/Cloisite 30BX nanocomposites were prepared containing 1, 3, 5, 7 and 10 wt% of C30BX clay, while PLA and PBS polymers compositions were fixed at a ratio of 80 to 20. This study also included the validation of a gas barrier model for these biodegradable nanocomposites. WAXD indicated an exfoliated structure for nanocomposites having 1 and 3 wt% of clay, while predominantly development of intercalated structures was noticed for nanocomposites higher than 5 wt% of clay. However, TEM images confirmed a mixed morphology of intercalated and exfoliated structure for nanocomposite having 1 wt% of clay, while some clusters or agglomerated tactoids were detected for nanocomposites having more than 3 wt% of clay contents. The percolation threshold region for these nanocomposites lied between 3-5 wt% of clay loadings. Liquid-like behaviour of PLA/PBS blends gradually changed to solid-like behaviour with the increase in concentration of clay. Shear viscosity for the nanocomposites decreased as shear rate increased, exhibiting shear thinning non-Newtonian behaviour. Tensile strength and Young's modulus initially increased for nanocomposites of up to 3 wt% of clay but then decreased with the introduction of more clay. At high clay content (more than 3 wt%), clay particles tend to aggregate which causes microcracks at the interface of clay-polymer by lowering the polymer-clay interaction. Percentage elongation at break did not show any improvement with the addition of clay. PLA/PBS blends were considered as immiscible with each other as two separate glass transition and melting temperatures were observed in modulated differential scanning calorimetry (MDSC) thermograms. MDSC showed that crystallinity of the nanocomposites was not much affected by the addition of clay and hence some compatibilizer is required. Thermogravimetric analysis showed that the nanocomposite containing 3 wt% of clay demonstrated highest thermal stability compared to other nanocomposites. Decrease in thermal stability was noticed above 3 wt% clay; however the initial degradation temperature of nanocomposites with 5, 7 and 10 wt% of clay was higher than that of PLA/PBS blend alone. Gas barrier property measurements were undertaken to investigate the transmission of oxygen gas and water vapours. Oxygen barrier properties showed significant improvement with these nanocomposites, while that for water vapour modest improvement was observed. By comparing the relative permeabilities obtained from the experiments and the model, it was concluded that PLA/PBS/clay nanocomposites validated the Bharadwaj model for up to 3 wt% of clay concentration.
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Krikorian, Vahik. "Bio-nanocomposites fabrication and characterization of layered silicate nanocomposites based on biocompatible/biodegradable polymers / by Vahik Krikorian." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file , 11.06 Mb, 148 p, 2005. http://wwwlib.umi.com/dissertations/fullcit/3187609.

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Tang, Xiaozhi. "Use of extrusion for synthesis of starch-clay nanocomposites for biodegradable packaging films." Diss., Manhattan, Kan. : Kansas State University, 2008. http://hdl.handle.net/2097/546.

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Morales, Gámez Laura Teresa. "Study of nanocomposites prepared from polyamides and biodegradable polyesters and poly(ester amide)s." Doctoral thesis, Universitat Politècnica de Catalunya, 2012. http://hdl.handle.net/10803/55251.

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Polymer clay nanocomposites of polyamides and biodegradable polymers with three kinds of organomodified clays were prepared by different techniques (in situ polymerization, solution casting, and melt mixing). The polymers used in this research were nylons 56, 65 and 47 and the biodegradable polymers: poly (glycolic acid-alt-6-hydrohexanoic acid) and poly(glycolic acid-alt-6-aminohexanoic acid). The development of biodegradable nanocomposites with improved or modified material properties is an interesting topic since these new materials are expected to replace already existing biodegradable and non-biodegradable commodity plastics in some specific applications.This project aims to study the influence of clay particles incorporated in a polymer matrix on the crystallization processes, the study of the in situ polymerization kinetics of mixtures of clays and monomers of biodegradable polymers, as well as the influence of nanoparticles on the thermal behavior and morphologic parameters. Even-odd, and odd-even polyamides were chosen to study the Brill transition and to prepare nanocomposites with organomodified clays. These polyamides have a peculiar structure where hydrogen bonds are established along two different directions. X-ray diffraction as well as SAXS-WAXD synchrotron experiments were employed to study the structural changes induced by temperature, during heating and cooling. Different organomodified clays were used to prepare nanocomposites, which final structure was found to be dependent on the preparation method. Nanocomposites derived from biodegradable polymers were characterized by means of X-ray diffraction and transmission electron microscopy. Morphological studies showed that the extent of clay dispersion depended on the clay type and on the preparation technique. Hence, exfoliated and intercalated nanocomposites could be obtained. The final nanocomposite structure was found to have a great influence on both cold and hot crystallization processes. Hence, the crystallization rate increased and decreased with respect to the neat polymer when intercalated and exfoliated structures were respectively obtained. The kinetics of the polymerization process was also studied by means of FTIR and SAXS-WAXD. The results indicate that the presence of the organomodified clay had a remarkable effect on the kinetic parameters.
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Asem, Heba. "Synthesis of Polymeric Nanocomposites for Drug Delivery and Bioimaging." Licentiate thesis, KTH, Funktionella material, FNM, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-186300.

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Nanomaterials have gained great attention for biomedical applications due to their extraordinary physico-chemical and biological properties. The current dissertation presents the design and development of multifunctional nanoparticles for molecular imaging and controlled drug delivery applications which include biodegradable polymeric nanoparticles, superparamagnetic iron oxide nanoparticles (SPION)/polymeric nanocomposite for magnetic resonance imaging (MRI) and drug delivery, manganese-doped zinc sulfide (Mn:ZnS) quantum dots (QDs)/ SPION/ polymeric nanocomposites for fluorescence imaging, MRI and drug delivery.Bioimaging is an important function of multifunctional nanoparticles in this thesis. Imaging probes were made of SPION and Mn:ZnS QDs for in vitro and in vivo imaging. The SPION have been prepared through a high temperature decomposition method to be used as MRI contrast agent. SPION and Mn:ZnS were encapsulated into poly (lactic-co-glycolic) acid (PLGA) nanoparticles during the particles formation. The hydrophobic model drug, busulphan, was loaded in the PLGA vesicles in the composite particles. T2*-weighted MRI of SPION-Mn:ZnS-PLGA phantoms exhibited enhanced negative contrast with r2* relaxivity of 523 mM-1 s-1. SPION-Mn:ZnS-PLGA-NPs have been successfully applied to enhance the contrast of liver in rat model.The biodegradable and biocompatible poly (ethylene glycol)-co-poly (caprolactone) (PEG-PCL) was used as matrix materials for polymeric nanoparticles -based drug delivery system. The PEG-PCL nanoparticles have been constructed to encapsulate SPION and therapeutic agent. The encapsulation efficiency of busulphan was found to be ~ 83 %. PEG-PCL nanoparticles showed a sustained release of the loaded busulphan over a period of 10 h. The SPION-PEG-PCL phantoms showed contrast enhancement in T2*-weighted MRI. Fluorescein-labeled PEG-PCL nanoparticles have been observed in the cytoplasm of the murine macrophage cells (J774A) by fluorescence microscopy. Around 100 % cell viability were noticed for PEG-PCL nanoparticles when incubated with HL60 cell line. The in vivo biodistribution of fluorescent tagged PEG-PCL nanoparticles demonstrated accumulation of PEG-PCL nanoparticles in different tissues including lungs, spleen, liver and kidneys after intravenous administration.

QC 20160516

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Kaur, Jasmeet. "Properties of biologically relevant nanocomposites: effects of calcium phosphate nanoparticle attributes and biodegradable polymer morphology." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/33981.

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This research is directed toward understanding the effect of nanoparticle attributes and polymer morphology on the properties of the nanocomposites with analogous nanoparticle chemistry. In order to develop this understanding, polymer nanocomposites containing calcium phosphate nanoparticles of different specific surface areas and shapes were fabricated and characterized through thermal and thermomechanical techniques. Nanoparticles were synthesized using reverse microemulsion technique. For nanocomposites with different surface area particles, the mobility of amorphous polymer chains was restricted significantly by the presence of particles with an interphase network morphology at higher loadings. Composites fabricated with different crystallinity matrices showed that the dispersion characteristics and reinforcement behavior of nanoparticles were governed by the amount of amorphous polymer fraction available. The study conducted on the effect of nanoparticle shape with near-spherical and nanofiber nanoparticles illustrated that the crystallization kinetics and the final microstructure of the composites was a function of shape of the nanoparticles. The results of this research indicate that nanoparticle geometry and matrix morphology are important parameters to be considered in designing and characterizing the structure-property relationship in polymer nanocomposites.
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Svagan, Anna. "Bio-inspired cellulose nanocomposites and foams based on starch matrix." Doctoral thesis, KTH, Biokompositer, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-9666.

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In 2007 the production of expanded polystyrene (EPS) in the world was over 4 million tonnes and is expected to grow at 6 percent per year. With the increased concern about environmental protection, alternative biodegradable materials from renewable resources are of interest. The present doctoral thesis work successfully demonstrates that starch-based foams with mechanical properties similar to EPS can be obtained by reinforcing the cell-walls in the foams with cellulose nanofibers (MFC). High cellulose nanofiber content nanocomposites with a highly plasticized (50/50) glycerol-amylopectin starch matrix are successfully prepared by solvent-casting due to the high compatibility between starch and MFC. At 70 wt% MFC, the nanocomposites show a remarkable combination of high tensile strength, modulus and strain to failure, and consequently very high work to fracture. The interesting combination of properties are due to good dispersion of nanofibers, the MFC network, nanofiber and matrix properties and favorable nanofiber-matrix interaction. The moisture sorption kinetics (30% RH) in glycerol plasticized and pure amylopectin film reinforced with cellulose nanofibers must be modeled using a moisture concentration-dependent diffusivity in most cases. The presence of cellulose nanofibers has a strong reducing effect on the moisture diffusivity. The decrease in zero-concentration diffusivity with increasing nanofiber content could be due to geometrical impedance, strong starch-MFC molecular interaction and constrained swelling due to the cellulose nanofiber network present. Novel biomimetic starch-based nanocomposite foams with MFC contents up to 40 wt% are successfully prepared by freeze-drying. The hierarchically structured nanocomposite foams show significant increase in mechanical properties in compression compared to neat starch foam. Still, better control of the cell structure could further improve the mechanical properties. The effect of cell wall composition, freeze-drying temperature and freezing temperature on the resulting cell structure are therefore investigated. The freeze-drying temperature is critical in order to avoid cell structure collapse. By changing the starch content, the cell size, anisotropy ratio and ratio between open and closed cells can be altered. A decrease in freezing temperature decreases the cell size and increases the anisotropy ratio. Finally, mechanical properties obtained in compression for a 30 wt% MFC foam prepared by freeze-drying demonstrates comparable properties (Young's modulus and yield strength) to expanded polystyrene at 50% RH and similar relative density. This is due to the reinforcing cellulose nanofiber network within the cell walls.
QC 20100913
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Books on the topic "Biodegradable nanocomposites"

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Calandrelli, Luigi. Biodegradable composites for bone regeneration. New York: Nova Science Publishers, 2010.

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Calandrelli, Luigi. Biodegradable composites for bone regeneration. Hauppauge, N.Y: Nova Science Publishers, 2009.

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Starch-based polymeric materials and nanocomposites: Chemistry, processing, and applications. Boca Raton: CRC Press, 2012.

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Depan, Dilip, ed. Biodegradable Polymeric Nanocomposites. CRC Press, 2015. http://dx.doi.org/10.1201/b19314.

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Biodegradable Polymeric Nanocomposites: Advances in Biomedical Applications. Taylor & Francis Group, 2015.

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Nanocomposites With Biodegradable Polymers Synthesis Properties And Future Perspectives. Oxford University Press, 2011.

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Polyhydroxyalkanoate (PHA) Based Blends, Composites and Nanocomposites. Royal Society of Chemistry, The, 2014.

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Rao, M. A., Jasim Ahmed, Brijesh K. Tiwari, and Syed H. Imam. Starch-Based Polymeric Materials and Nanocomposites: Chemistry, Processing, and Applications. Taylor & Francis Group, 2012.

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Rao, M. A., Jasim Ahmed, Brijesh K. Tiwari, and Syed H. Imam. Starch-Based Polymeric Materials and Nanocomposites: Chemistry, Processing, and Applications. Taylor & Francis Group, 2016.

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Book chapters on the topic "Biodegradable nanocomposites"

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García, N. L., L. Famá, N. B. D’Accorso, and S. Goyanes. "Biodegradable Starch Nanocomposites." In Advanced Structured Materials, 17–77. New Delhi: Springer India, 2015. http://dx.doi.org/10.1007/978-81-322-2470-9_2.

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Ludueña, Leandro, Juan Morán, and Vera Alvarez. "Biodegradable Polymer/Clay Nanocomposites." In Advanced Structured Materials, 109–35. New Delhi: Springer India, 2015. http://dx.doi.org/10.1007/978-81-322-2470-9_4.

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Pollet, Eric, Marie-Amélie Paul, and Philippe Dubois. "New Aliphatic Polyester Layered-Silicate Nanocomposites." In Biodegradable Polymers and Plastics, 327–50. Boston, MA: Springer US, 2003. http://dx.doi.org/10.1007/978-1-4419-9240-6_22.

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Ngo, Tri-Dung. "Biobased and Biodegradable Polymers Nanocomposites." In Handbook of Nanomaterials and Nanocomposites for Energy and Environmental Applications, 1–28. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-11155-7_142-1.

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Ngo, Tri-Dung. "Biobased and Biodegradable Polymer Nanocomposites." In Handbook of Nanomaterials and Nanocomposites for Energy and Environmental Applications, 1493–519. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-36268-3_142.

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Ray, Suprakas Sinha, and James Ramontja. "Polylactide-Based Nanocomposites." In Biodegradable Polymer Blends and Composites from Renewable Resources, 389–413. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2009. http://dx.doi.org/10.1002/9780470391501.ch16.

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Morán, J. I., L. N. Ludueña, and V. A. Alvarez. "Recent Advances in Nanocomposites Based on Biodegradable Polymers and Nanocellulose." In Nanocellulose Polymer Nanocomposites, 237–54. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2014. http://dx.doi.org/10.1002/9781118872246.ch9.

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Thomas, Deepu, John-John Cabibihan, Sasi Kumar, S. K. Khadheer Pasha, Dipankar Mandal, Meena Laad, Bal Chandra Yadav, et al. "Biodegradable Nanocomposites for Energy Harvesting, Self-healing, and Shape Memory." In Smart Polymer Nanocomposites, 377–97. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-50424-7_14.

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Guarás, María Paula, Leandro Nicolas Ludueña, and Vera Alejandra Alvarez. "Recent Advances in Thermoplastic Starch Biodegradable Nanocomposites." In Handbook of Nanomaterials and Nanocomposites for Energy and Environmental Applications, 1–24. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-11155-7_20-1.

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Guarás, María Paula, Leandro Nicolas Ludueña, and Vera Alejandra Alvarez. "Recent Advances in Thermoplastic Starch Biodegradable Nanocomposites." In Handbook of Nanomaterials and Nanocomposites for Energy and Environmental Applications, 3465–87. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-36268-3_20.

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Conference papers on the topic "Biodegradable nanocomposites"

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Mistretta, Maria Chiara, Sebastiano Rifici, Luigi Botta, Marco Morreale, and Francesco Paolo La Mantia. "Rheological and mechanical properties of biodegradable nanocomposites." In 9TH INTERNATIONAL CONFERENCE ON “TIMES OF POLYMERS AND COMPOSITES”: From Aerospace to Nanotechnology. Author(s), 2018. http://dx.doi.org/10.1063/1.5045924.

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Waly, Gihan H., Inas S. Abdel Hamid, Mohamed A. Sharaf, Mona K. Marei, and Naglaa A. Mostafa. "Evaluation of Hybrid Chitosan-Cellulose Biodegradable Scaffolds for Tissue Engineering Applications." In ASME 2008 2nd Multifunctional Nanocomposites and Nanomaterials International Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/mn2008-47068.

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Natural polymers continue to provide effective biocompatible scaffolds for use in tissue engineering applications. In some respects, their chemical structure closely mimics that of the extracelluar matrix of biological tissues. Eventhough a wide variety of biopolymers can be used for these applications, no single polymer has been yet found to fulfill all requirements needed in a scaffold material. In an attempt to combine the advantages of two natural polymers, hybrid scaffolds of chitosan/cellulose constructs had been evaluated as candidates for tissue engineering applications. Four groups of hybrid chitosan/cellulose scaffolds were prepared with different cellulose concentrations. The surface and bulk porosities scaffolds have been examined using scanning electron microscope (SEM). The SEM photographs revealed that all hybrid scaffold groups exhibited an interconnected highly porous structure. Percent porosity and pore volume distribution were evaluated using mercury intrusion porosimetry (MIP). The scaffolds were mechanically tested to evaluate their compressive strength. The biodegradation rate in lysozyme-containing saline had been also determined over a six week period. The MIP results showed that all scaffolds had percent porosity in excess of 75% and that the percent porosity decreased by increasing the cellulose concentration. The incremental intrusion versus diameter curves revealed that most of the scaffolds porosity occurred in the macro-scale. The compressive strength of the scaffold showed an increase with an increase in the cellulose concentration. However, the biodegradation rate was found to vary inversely with the cellulose content in the hybrid. In order to evaluate the cytocompatibility of the chitosan-based scaffolds, mesenchymal stem cells were statically seeded and their attachment had been evaluated. The results revealed that after three and eight day of seeding, the scaffolds became highly populated with cells. This serves as a clear indicatation that the scaffolds thus investigated promote cell attachment and support cell proliferation and proliferation. Thus, the investigated scaffolds are promising candidates for tissue engineering applications.
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Olivieri, R., L. Di Maio, P. Scarfato, and L. Incarnato. "Preparation and characterization of biodegradable PLA/organosilylated clay nanocomposites." In VIII INTERNATIONAL CONFERENCE ON “TIMES OF POLYMERS AND COMPOSITES”: From Aerospace to Nanotechnology. Author(s), 2016. http://dx.doi.org/10.1063/1.4949677.

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Gutmanas, E. Y., I. Gotman, A. Sharipova, S. G. Psakhie, S. K. Swain, and R. Unger. "Drug loaded biodegradable load-bearing nanocomposites for damaged bone repair." In PHYSICS OF CANCER: INTERDISCIPLINARY PROBLEMS AND CLINICAL APPLICATIONS: Proceedings of the International Conference on Physics of Cancer: Interdisciplinary Problems and Clinical Applications (PC IPCA’17). Author(s), 2017. http://dx.doi.org/10.1063/1.5001604.

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Clarke, Ashley, Alexandros A. Vasileiou, and Marianna Kontopoulou. "Crystalline nanocellulose in biodegradable polyester nanocomposites prepared by in situ polymerization." In PROCEEDINGS OF PPS-32: The 32nd International Conference of the Polymer Processing Society - Conference Papers. Author(s), 2017. http://dx.doi.org/10.1063/1.5016697.

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Barbaro, G., M. R. Galdi, L. Di Maio, and L. Incarnato. "Nanocomposites biodegradable coating on BOPET films to enhance hot seal strength properties." In THE SECOND ICRANET CÉSAR LATTES MEETING: Supernovae, Neutron Stars and Black Holes. AIP Publishing LLC, 2015. http://dx.doi.org/10.1063/1.4937333.

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Verma, Devendra, Kalpana Katti, and Dinesh Katti. "Biopolymer Polyelectrolyte Complex Nanocomposites for Bone Tissue Engineering." In ASME 2009 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2009. http://dx.doi.org/10.1115/sbc2009-206390.

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Recent studies have shown that its necessary for synthetic matrix to provide similar mechanical response as cell’s host environment in the body for desired tissue growth [1,2]. Osteoblast cells reside in the rigid matrix made of collagen fibers and hydroxyapatite crystals. Therefore for the growth of proper functional bone tissue, its utmost necessary that scaffolds provide mechanical response similar to bone matrix. Bone also serves as a mechanical support to the body. Thus scaffolds used for bone tissue engineering should also provide adequate mechanical support to prevent collapse of the neonatal tissue. The mechanical response of scaffolds decreases significantly as porosity increases. The porosity of scaffold around 90% has been considered optimal for tissue engineering. At such high porosity, the mechanical strength and elastic modulus decreases significantly. Various polymers both of synthetic and biological origin have been investigated as a material for scaffold [3]. Synthetic polymers are biodegradable, biocompatible, and can be easily formed into different shapes and sizes. However, hydrophobicity, lack of functional groups and release of acidic products on degradation are causes of concern. Biopolymers such as collagen, chitin, chitosan etc. promote cell adhesion, proliferation and differentiation, and evoke minimal foreign body reaction on implantation [4]. But, they have inadequate mechanical properties for bone regeneration and tend to loose structural integrity under wet and body fluid conditions. The quest for scaffold materials which, not only promote cell adhesion, proliferation and differentiation but also have adequate mechanical strength to support bone tissue growth is still on. In the current work, we discuss the synthesis and characterizations of nanocomposites based on biopolymers and hydroxyapatite. The biopolymers used are chitosan and polygalacturonic acid. These two biopolymers are biocompatible, biodegradable and electrostatically complementary to each other. We have also investigated the molecular mechanics involved in their mechanical behavior. Their in vitro response have been investigated by seeding human Osteoblast cells and studying their adhesion, proliferation and differentiation. Synthesis and characterizations of nanostructured fibers based on chitosan and polygalacturonic acid will also be discussed here.
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Zhang, Qingwei, Yury Gogotsi, Peter I. Lelkes, and Jack G. Zhou. "Nanodiamond Reinforced PLLA Nanocomposites for Bone Tissue Engineering." In ASME 2012 International Manufacturing Science and Engineering Conference collocated with the 40th North American Manufacturing Research Conference and in participation with the International Conference on Tribology Materials and Processing. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/msec2012-7393.

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Nanodiamond (ND) is an attractive nanomaterial for reinforcement of biopolymers due to the ND’s superior mechanical and chemical properties, and low biotoxicity. A novel composite material has been produced for bone scaffolds utilizing the biodegradable polymer poly(L-lactic acid) (PLLA) and octadecylamine-functionalized nanodiamond (ND-ODA). Composites were prepared by admixing to a PLLA/chloroform solution chloroform suspension of ND-ODA in concentration range of 0–10% (w/w). The dispersion of ND-ODA evaluated by transmission electron microscopy (TEM) shows uniform distribution of ND-ODA in PLLA matrix. The composites were characterized by differential scanning calorimetry (DSC). DSC analysis of the composites showed no significant thermal behavior changes with the addition of ND-ODA into the polymer. Biomineralization test shows that ND-ODA can enhance the mineral deposition on scaffolds. Improved mechanical properties and good biocompatibility with enhanced biomineralization combined suggest that ND-ODA/PLLA might have potential applications for bone tissue engineering.
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Ramos, Maximiano V., Armstrong Frederick, and Ahmed M. Al-Jumaily. "Nano-Filled Polymer Composites for Biomedical Applications." In ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-67759.

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Polymer nanocomposites offer various functional advantages required for several biomedical applications. For example, polymer nanocomposites are biocompatible, biodegradable, and can be engineered to have mechanical properties suitable for specific applications. The key to the use of polymer nanocomposites for different applications is the correct choice of matrix polymer chemistry, filler type, and matrix-filler interaction. This paper discusses the results of a study in the processing and characterization of nono-filled polymer composites and focuses on the improvement of its properties for potential biomedical applications. The experimental procedure for the preparation of nano-filled polymer composite by ultrasonic mixing is described. Different types of nanofillers and polymer matrix are studied. Effects of processing parameters such as percent loading of fillers, mixing time on the mechanical properties of the composites are discussed. Preliminary results indicate improvement in shear and flexural properties, tensile and compressive properties, were observed in the prepared composites for some processing conditions.
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John, Sam, James Baben George, and Abraham Joseph. "Photoluminescence of Co: ZnNiO and Zr: ZnNiO nanocomposites capped with biodegradable polymer poly (2-ethyl-2-oxazoline)." In 2ND INTERNATIONAL CONFERENCE ON CONDENSED MATTER AND APPLIED PHYSICS (ICC 2017). Author(s), 2018. http://dx.doi.org/10.1063/1.5032749.

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