Artykuły w czasopismach: „Nanoparticle- polymer Blend”

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Zhang, Ren, Bongjoon Lee, Michael R. Bockstaller, Abdullah M. Al-Enizi, Ahmed Elzatahry, Brian C. Berry i Alamgir Karim. "Soft-shear induced phase-separated nanoparticle string-structures in polymer thin films". Faraday Discussions 186 (2016): 31–43. http://dx.doi.org/10.1039/c5fd00141b.

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Application of shear stress has been shown to unidirectionally orient the microstructures of block copolymers and polymer blends. In the present work, we study the phase separation of a novel nanoparticle (NP)–polymer blend thin film system under shear using a soft-shear dynamic zone annealing (DZA-SS) method. The nanoparticles are densely grafted with polymer chains of chemically dissimilar composition from the matrix polymer, which induces phase separation upon thermal annealing into concentrated nanoparticle domains. We systematically examine the influence of DZA-SS translation speed and thus the effective shear rate on nanoparticle domain elongation and compare this with the counterpart binary polymer blend behavior. Unidirectionally aligned nanoparticle string-domains are fabricated in the presence of soft-shear in confined thin film geometry. We expect this DZA-SS method to be applicable to various NP–polymer blends towards unidirectionally aligned nanoparticle structures, which are important to functional nanoparticle structure fabrication.

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Ruiz de Luzuriaga, Alaitz, Hans Grande i Jose A. Pomposo. "A Theoretical Investigation of Polymer-Nanoparticles as Miscibility Improvers in All-Polymer Nanocomposites". Journal of Nano Research 2 (sierpień 2008): 105–14. http://dx.doi.org/10.4028/www.scientific.net/jnanor.2.105.

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The miscibility behaviour of polymer-nanoparticle / linear-polymer blends (all-polymer nanocomposites) has been investigated using an incompressible mean-field theoretical model that accounts for combinatorial, temperature-dependent exchange interaction energy and nanoparticle-driven effects. The theory is employed to predict the phase diagram of poly(styrene)-nanoparticle (PS-np) / linear-poly(vinyl methyl ether) (PVME) nanocomposites from room temperature to 675 K. Complete miscibility is predicted for PS-nanoparticles with radius < 6 nm blended with PVME (molecular weight 62 500 g/mol, nanoparticle volume fraction 20 %). The effect of PVME molecular weight and blend composition on the miscibility diagram is also addressed. When compared to the well-known experimental phase diagram of linear-PS / PVME blends displaying lower critical solution temperature (LCST) behaviour, the miscibility improving effect of sub-10 nm PS-nanoparticles is clearly highlighted. In terms of the model, this favourable nanoscale effect arises mainly from the reduced stretching induced by the sub-10 nm nanoparticles and the increased exothermic contacts when compared to nanoparticles with sizes > 10 nm.

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Mohammed, K. J. "Study the effect of CaCO3 nanoparticles on physical properties of biopolymer blend". Iraqi Journal of Physics (IJP) 16, nr 39 (5.01.2019): 11–22. http://dx.doi.org/10.30723/ijp.v16i39.97.

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Chitosan (CH) / Poly (1-vinylpyrrolidone-co-vinyl acetate) (PVP-co-VAc) blend (1:1) and nanocomposites reinforced with CaCO3 nanoparticles were prepared by solution casting method. FTIR analysis, tensile strength, Elongation, Young modulus, Thermal conductivity, water absorption and Antibacterial properties were studied for blend and nanocomposites. The tensile results show that the tensile strength and Young’s modulus of the nanocomposites were enhanced compared with polymer blend [CH/(PVP-co-VAc)] film. The mechanical properties of the polymer blend were improved by the addition of CaCO3 with significant increases in Young’s modulus (from 1787 MPa to ~7238 MPa) and tensile strength (from 47.87 MPa to 79.75 MPa). Strong interfacial bonding between the CaCO3 nanoparticles and the [CH/(PVP-co-VAc)), homogenous distribution of the nanoparticles in the polymer blend, are assistance of noticeably raised mechanical durability. The thermal conductivity of the polymer blend and CaCO3 nanocomposite films show that it decreased in the adding of nanoparticle CaCO3. The solvability measurements display that the nanocomposite has promoted water resistance. The weight gain lowered with the increase of nano CaCO3. Blending chitosan CH with (PVP-co-VAc) enhanced strength and young modules of the nanocomposites and increased the absorption of water because hydrophilic of the blended polymers films. The effect of two types of positive S.aurous and negative E. coli was studied. The results showed that the nanocomposites were effective for both types, where the activity value ranged from (12 ~ 21). The best results were found for S.aurous bacteria.

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Elhosiny Ali, H., Z. R. Khan, H. Algarni, E. F. El-Shamy, Mohd Shkir i Yasmin Khairy. "Engineering the Physical Properties of Polyvinyl Pyrrolidone/Polyvinyl Alcohol Blend Films by Adding Tb–NiO Nanoparticles for Flexible Optoelectronics Applications". Journal of Nanoelectronics and Optoelectronics 17, nr 3 (1.03.2022): 374–82. http://dx.doi.org/10.1166/jno.2022.3216.

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Polyvinyl pyrrolidone (PVP)-polyvinyl alcohol (PVA) (1:1) polymer mixture films were developed using the solution-casting technique. Physical properties engineering of as grown chemical casting films were achieved through the Tb–NiO nanoparticles mixing in a polymer blend with different content of 0.0, 0.037, 0.37, 1.85, and 3.7 wt%. The variation of physical properties of nanocomposites thin layer was examined from X-ray diffractometer, atomic force microscope (AFM), FTIR spectroscopy, and Uv-visible spectroscopy. Optical band gaps of polymer nanocomposites films were calculated to study the influence of Tb–NiO nanoparticle doping are decreased after addition of Tb–NiO nanostructures in the composites. AFM images of films reveal successful adsorption of Tb–NiO nanoparticles in polymer blend. In addition, FTIR spectra showed successful loading of Tb–NiO nanoparticles in PVP/PVA blend matrix. The extinction coefficients, refractive index, optical dielectric constant and optical conductivity were also investigated in correlation with different wt% Tb–NiO doping concentrations. In addition, the values of oscillator, dispersion energies Eo, Ed and static refractive indices no were calculated. The optical limiting behavior of films showed that the polymer nanocomposite films are suitable for flexible optoelectronics devices.

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Meng, Lingyao, Hongyou Fan, J. Matthew D. Lane i Yang Qin. "Bottom-Up Approaches for Precisely Nanostructuring Hybrid Organic/Inorganic Multi-Component Composites for Organic Photovoltaics". MRS Advances 5, nr 40-41 (2020): 2055–65. http://dx.doi.org/10.1557/adv.2020.196.

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Abstract:Achieving control over the morphology of conjugated polymer (CP) blends at nanoscale is crucial for enhancing their performances in diverse organic optoelectronic devices, including thin film transistors, photovoltaics, and light emitting diodes. However, the complex CP chemical structures and intramolecular interactions often make such control difficult to implement. We demonstrate here that cooperative combination of non-covalent interactions, including hydrogen bonding, coordination interactions, and π-π interactions, etc., can be used to effectively define the morphology of CP blend films, in particular being able to achieve accurate spatial arrangement of nanoparticles within CP nanostructures. Through UV-vis absorption spectroscopy and transmission electron microscopy, we show strong attachment of fullerene molecules, CdSe quantum dots, and iron oxide nanoparticles, onto well-defined CP nanofibers. The resulting core/shell hybrid nanofibers exhibit well-defined donor/acceptor interface when employed in photovoltaic devices, which also contributes to enhanced charge separation and transport. These findings provide a facile new methodology of improving CP/nanoparticle interfacial properties and controlling blend morphology. The generality of this methodology demonstrated in current studies points to a new way of designing hybrid materials based on organic polymers and inorganic nanoparticles towards applications in modern electronic devices.

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Guruswamy, B., V. Ravindrachary, C. Shruthi i M. Mylarappa. "Effect of SnO₂ Nanoparticle Doping on Structural, Morphological and Thermal Properties of PVA-PVP Polymer Blend". Materials Science Forum 962 (lipiec 2019): 82–88. http://dx.doi.org/10.4028/www.scientific.net/msf.962.82.

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The n-type semiconductor SnO2 nanoparticles were synthesised using standard route and the effect of this nanoparticle doping on structural, morphological and thermal properties of PVA-PVP polymer blend has been investigated. Pure and PVA-PVP/SnO2 Nanocomposite films were prepared using solution casting technique. The powder X-ray diffraction result shows that the crystalline nature of the blend increases with doping level. FESEM study shows that the surface morphology of the polymer nanocomposite varies with doping level. AFM study reveals that in the nanocomposite films, the average roughness changes with dopant concentration. The DSC studies on the samples were performed from 40°C to 400°C under nitrogen atmosphere and it shows that the thermal properties of the blend changes with doping concentration.

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Riyajan, Sa-Ad, i Janthanipa Nuim. "Interaction of Green Polymer Blend of Modified Sodium Alginate and Carboxylmethyl Cellulose Encapsulation of Turmeric Extract". International Journal of Polymer Science 2013 (2013): 1–10. http://dx.doi.org/10.1155/2013/364253.

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Turmeric extract (tmr) loaded nanoparticles were prepared by crosslinking modified carboxylmethyl cellulose (CMC) and modified sodium alginate (SA) with calcium ions, in a high pressure homogenizer. The FTIR spectra of CMC and SA were affected by blending due to hydrogen bonding. The negative zeta potential increased in magnitude with CMC content. The smallest nanoparticles were produced with a 10 : 5 SA/CMC blend. Also the release rates of the extract loading were measured, with model fits indicating that the loading level affected the release rate through nanoparticle structure. The 10 : 5 SA/CMC blend loading with tmr and pure tmr showed a good % growth inhibition of colon cancer cells which indicate that tmr in the presence of curcumin in tmr retains its anticancer activity even after being loaded into SA/CMC blend matrix.

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Bergaliyeva, Saltanat, David L. Sales, José María Jiménez Cabello, Pedro Burgos Pintos, Natalia Fernández Delgado, Patricia Marzo Gago, Ann Zammit i Sergio I. Molina. "Thermal and Mechanical Properties of Reprocessed Polylactide/Titanium Dioxide Nanocomposites for Material Extrusion Additive Manufacturing". Polymers 15, nr 16 (18.08.2023): 3458. http://dx.doi.org/10.3390/polym15163458.

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Polylactic acid (PLA) is a biodegradable polymer that can replace petroleum-based polymers and is widely used in material extrusion additive manufacturing (AM). The reprocessing of PLA leads to a downcycling of its properties, so strategies are being sought to counteract this effect, such as blending with virgin material or creating nanocomposites. Thus, two sets of nanocomposites based respectively on virgin PLA and a blend of PLA and reprocessed PLA (rPLA) with the addition of 0, 3, and 7 wt% of titanium dioxide nanoparticles (TiO2) were created via a double screw extruder system. All blends were used for material extrusion for 3D printing directly from pellets without difficulty. Scanning electron micrographs of fractured samples’ surfaces indicate that the nanoparticles gathered in agglomerations in some blends, which were well dispersed in the polymer matrix. The thermal stability and degree of crystallinity for every set of nanocomposites have a rising tendency with increasing nanoparticle concentration. The glass transition and melting temperatures of PLA/TiO2 and PLA/rPLA/TiO2 do not differ much. Tensile testing showed that although reprocessed material implies a detriment to the mechanical properties, in the specimens with 7% nano-TiO2, this effect is counteracted, reaching values like those of virgin PLA.

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Bahtiar, Ayi, Siti Halimah Tusaddiah, Wendy Paramandhita S. Mustikasari, Lusi Safriani, Mariah Kartawidjaja, Kei Kanazawa, Ippei Enokida, Yukio Furukawa i Isao Watanabe. "Optical, Structural and Morphological Properties of Ternary Thin Film Blend of P3HT:PCBM:ZnO Nanoparticles". Materials Science Forum 827 (sierpień 2015): 119–24. http://dx.doi.org/10.4028/www.scientific.net/msf.827.119.

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Ternary blend film of conjugated polymer, fullerene and inorganic nanoparticles has intensively studied as active material for high power conversion efficiency (PCE) of hybrid organic-inorganic solar cells. The incorporation of two electron acceptor materials of organic fullerene and inorganic nanoparticles into hybrid with electron donor conjugated polymer is strongly believed can improve the PCE of solar cells by increasing exciton dissociation efficiency due to an increase of interface area between donor and acceptor materials where the positive and negative charges dissociated. We studied optical, structural and morphological properties of ternary thin film containing blend of conjugated polymer poly(3-hexylthiophene (P3HT):fullerene derivative PCBM:Zinc oxide nanoparticles (ZnO-NP) by measuring its optical absorption, crystal structure and film surface morphology. Zinc oxide nanoparticle was prepared by sol-gel method. It has optical absorption below 370 nm and average particle size 40 nm as shown by TEM picture. Ternary thin blend films of P3HT:PCBM:ZnO-NP were prepared by use of spin-coating method. The UV-Vis spectrum of thin film contains absorption peaks originated from contribution of P3HT at wavelengths 520 nm, 550 nm and 600 nm, from contribution of PCBM at 260 nm and 330 nm and from ZnO-NP at wavelengths below 370 nm which confirms that these three materials were well mixed in the films. Its XRD pattern also contains the peaks from each of these three-materials. In this report, we compare surface morphology of thin films of pure P3HT, pure ZnO-NP, blend of P3HT:PCBM, blend of P3HT:ZnO-NP and ternary blend of P3HT:PCBM:ZnO-NP.

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Pierini, Filippo, Massimiliano Lanzi, Paweł Nakielski i Tomasz Aleksander Kowalewski. "Electrospun Polyaniline-Based Composite Nanofibers: Tuning the Electrical Conductivity by Tailoring the Structure of Thiol-Protected Metal Nanoparticles". Journal of Nanomaterials 2017 (2017): 1–10. http://dx.doi.org/10.1155/2017/6142140.

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Composite nanofibers made of a polyaniline-based polymer blend and different thiol-capped metal nanoparticles were prepared using ex situ synthesis and electrospinning technique. The effects of the nanoparticle composition and chemical structure on the electrical properties of the nanocomposites were investigated. This study confirmed that Brust’s procedure is an effective method for the synthesis of sub-10 nm silver, gold, and silver-gold alloy nanoparticles protected with different types of thiols. Electron microscopy results demonstrated that electrospinning is a valuable technique for the production of composite nanofibers with similar morphology and revealed that nanofillers are well-dispersed into the polymer matrix. X-ray diffraction tests proved the lack of a significant influence of the nanoparticle chemical structure on the polyaniline chain arrangement. However, the introduction of conductive nanofillers in the polymer matrix influences the charge transport noticeably improving electrical conductivity. The enhancement of electrical properties is mediated by the nanoparticle capping layer structure. The metal nanoparticle core composition is a key parameter, which exerted a significant influence on the conductivity of the nanocomposites. These results prove that the proposed method can be used to tune the electrical properties of nanocomposites.

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Sampaio da Silva, Fernanda A., Edwin E. G. Rojas i Marcos Flavio de Campos. "Study of Thermal Degradation of PEG/PVP Coating Adsorbed in Fe₃O₄ Nanoparticles". Materials Science Forum 881 (listopad 2016): 481–84. http://dx.doi.org/10.4028/www.scientific.net/msf.881.481.

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The nanoparticle materials have been intensively studied in recent decades aiming mainly at the medical fields. In particular, nanoparticles of magnetite, Fe3O4, because it has physical and magnetic properties compatible with in vivo applications. However, even if the magnetite has low toxicity, it is necessary that the particles are coated with biocompatible material. In this work, Fe3O4 nanoparticles coated by a polymer blend of polyethylene glycol / polyvinylpyrrolidone (type core / layer) were analyzed. It was performed to study the thermal degradation of the polymer coating layer aimed at understanding the nature of the forces involved in adsorption surface of the metallic core.

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J. Kadham, Alaa, Dalal Hassan, Najlaa Mohammad i Ahmed Hashim Ah-yasari. "Fabrication of (Polymer Blend-magnesium Oxide) Nanoparticle and Studying their Optical Properties for Optoelectronic Applications". Bulletin of Electrical Engineering and Informatics 7, nr 1 (1.03.2018): 28–34. http://dx.doi.org/10.11591/eei.v7i1.839.

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Nanocomposites used in many optical devices applications. This aims to preparation of new type of polymer and study their optical properties. The polyvinyl pyrrolidone-carboxymethyl cellulose blend and magnesium oxide nanocomposites have been fabricated. The nanocomposites are prepared for different concentrations of polymer blend and magnesium oxide nanoparticles. The optical properties of nanocomposites were studied. The experimental results showed that the absorbance, absorption coefficient, refractive index, extinction coefficient, real and imaginary parts of dielectric constant and optical conductivity of (PVP-CMC) blend are increased with increase of the MgO nanoparticles concentration. The transmittance and energy band gap are decreased with increase of the MgO nanoparticles concentration. The nanocomposites have high absorbance in UV region which may be used for radiation shielding application.

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Alsaedi, Sally A., Sihama I. Salih i Fadhil A. Hashim. "Preparation and Characterization of Polymer Blend and Nano Composite Materials Based on PMMA Used for Bone Tissue Regeneration". Engineering and Technology Journal 38, nr 4A (25.04.2020): 501–9. http://dx.doi.org/10.30684/etj.v38i4a.383.

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As the elderly population increases, the need for bone loss treatments is increasing. Vital substances used in such treatments are required to continue for a longer period and work more effectively. The particularly important biological material is poly methyl methacrylate (PMMA) bone cement, which is widely used in damaged bone replacement surgery. So, this study focused on the role of added some nanoparticles consist of zirconia (ZrO2), and magnesia (MgO) on the binary polymeric blend (Acrylic bone cement: 15% PMMA) for a bone scaffold. Where, ZrO2 and MgO nanoparticle was added with selected weight percentages (0, 0.5, 1, 1.5 and 2 wt.%), which were added to the polymer blend matrix. Some mechanical properties were studied including the tensile strength and young modulus for all the prepared samples. The chemical bonding of nanoparticles and synthetic binary polymeric blend composites was evaluated by Fourier Transform Infrared (FTIR) spectroscopy. Tensile strength and young modulus of binary polymeric blend reinforced with 1.5 wt.% ZrO2, and 1 wt.% MgO, significantly increased. The surface morphology of the fracture surface of tensile specimens was examined by Scanning electron microscope (SEM). The SEM images confirmed that the homogenous distribution of nanoparticles (ZrO2, and MgO) within the polymeric blend matrix.

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Salih, Sihama I. "DEVELOPMENT DESIRED PROPERTIES OF POLYSTYRENE NANO COMPOSITES BY ADDING POLYMERIC MODIFIERS". IRAQI JOURNAL FOR MECHANICAL AND MATERIALS ENGINEERING 19, nr 2 (26.05.2019): 207–23. http://dx.doi.org/10.32852/iqjfmme.v19i2.319.

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The introduction of polymeric blend-based nanomaterials has encouraged the developmentof flexible nanocomposites for structural applications in need of superior mechanical,performance. In current research, three groups of polystyrene blend-based nanocompositessamples were fabricated by melting technique using a twin-screw extruder. These samplesconsist of polymer blend (polystyrene (PS): 1% copolymer (polystyrene (PS)-co- maleicanhydride (MA)): 3%ABS) as a matrix material, was strengthen by three different type ofpowders in nanometer size (silica (SiO2), cement kiln dust (CKD) and Fly ash (FA))individually, with selected weight ratio (0, 0.2, 0.4, 0.6 & 0.8 wt. %) for each of them.Experimental investigation was carried out for tensile properties and fatigue strength besidesFTIR test and morphology analyzing of fracture surfaces by SEM. The results showed thattensile strength values and modulus of elasticity increased as the nanoparticle content incomposite increased, but according to specific percentages of nanoparticle content in thecomposites samples, for three groups of the prepared nanocomposites samples. Moreover,the fatigue test revealed the super-improvement in the fatigue properties of the selectedhybrid nanocomposites samples, as compared with neat polystyrene and polymer blend (PS:1% (PS-co-MA): 3% ABS) and fatigue limit was apparent for all types of hybridnanocomposites materials produced in this work. Morphology of the fracture surface wasshowed a homogeneous structure formation for optimal samples of each group ofcomposites, indicating a good compatibility between the component materials of polymerblend and the reinforcement nanoparticles.

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More, Dikeledi S., Makwena J. Moloto, Nosipho Moloto i Kgabo P. Matabola. "Silver/Copper Nanoparticle-Modified Polymer Chitosan/PVA Blend Fibers". International Journal of Polymer Science 2021 (30.06.2021): 1–12. http://dx.doi.org/10.1155/2021/6217609.

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In this study, chitosan (CS)/poly(vinyl alcohol) (PVA) (CS/PVA) blend nanofibers with varying weight ratios and silver (Ag)/copper (Cu)/CS/PVA composite fibers have been prepared successfully by the electrospinning process. The tip-to-collector distance was kept at 15 cm, and the applied voltage was varied from 15 to 25 kV. The effects of the weight ratios and applied voltage on the morphology and diameter of the fibers were investigated. The resultant fibers were characterized using scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), and thermogravimetric analysis (TGA). The SEM results showed that increasing the amount of chitosan in the CS/PVA blend resulted in a decrease in the fiber diameter from 162 to 89 nm while an increase in the voltage from 15 to 25 kV led to a decrease in the fiber diameters. Furthermore, the SEM results indicated that an increase in the fiber diameter from 161 to 257 nm was observed while morphological changes were also observed upon the Ag/Cu addition. The latter changes are perceived to be a result of increased conductivity and higher charge density.

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Kausar, Ayesha. "A review of filled and pristine polycarbonate blends and their applications". Journal of Plastic Film & Sheeting 34, nr 1 (27.01.2017): 60–97. http://dx.doi.org/10.1177/8756087917691088.

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Polycarbonate is an important thermoplastic polymer. Due to its high performance, polycarbonate has a range of engineering applications in construction, automotive, aircraft, data storage, electrical, and telecommunication hardware. However, polycarbonate’s use is limited in advanced applications due to limitations, such as strong hydrophobicity, relatively limited chemical functionality, high melt viscosity, notch sensitivity of mechanical properties, and relative softness. Blending with other thermoplastic polymers improves its physical characteristics. The present review outlines up-to-date developments concerning the design and application of polycarbonate blends. A particular emphasis has been given to establish polycarbonate blends such as: • polycarbonate/polyethylene • polycarbonate/poly(methyl methacrylate) • polycarbonate/poly(vinylchloride) • polycarbonate/ polystyrene • polycarbonate/polyurethane • polycarbonate/polyester • polycarbonate/poly(ɛ-caprolactone). To improve the polycarbonate blend properties, fillers including organic and inorganic reinforcement materials (carbon nanotube, montmorillonite nanoclay, and metal nanoparticle) have also been employed. Polycarbonate blend applications in biomedical, flame retardant, and membrane materials have also been reviewed. To fully exploit the future potential for polycarbonate-based engineering materials, the structure–property relationship and compatibilization mechanisms need to be further explored.

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Qiang, Yiwei, Neha Manohar, Kathleen J. Stebe i Daeyeon Lee. "Polymer blend-filled nanoparticle films via monomer-driven infiltration of polymer and photopolymerization". Molecular Systems Design & Engineering 3, nr 1 (2018): 96–102. http://dx.doi.org/10.1039/c7me00099e.

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Francis, Dali Vilma, Saurav Thaliyakattil, Lucy Cherian, Neeru Sood i Trupti Gokhale. "Metallic Nanoparticle Integrated Ternary Polymer Blend of PVA/Starch/Glycerol: A Promising Antimicrobial Food Packaging Material". Polymers 14, nr 7 (29.03.2022): 1379. http://dx.doi.org/10.3390/polym14071379.

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Advances in food processing and food packaging play a major role in keeping food safe, increasing the shelf life, and maintaining the food supply chain. Good packaging materials that enable the safe travel of food are often non-degradable and tend to persist in the environment, thereby posing a hazard. One alternative is to synthesize biodegradable polymers with an antimicrobial property while maintaining their mechanical and thermal properties. In the present study, biodegradable composites of PVA–starch–glycerol (PSG) incorporated with CuO and ZnO nanoparticles (NPs) were prepared as PSG, PSG–Cu, PSG–Zn, and PSG–CuZn films. Scanning electron microscopy, energy dispersive x-ray analysis, and thermogravimetric analysis were performed to study and characterize these films. The water barrier properties of the films improved significantly as the hydrophobicity of the PSG–CuZn film increased by 32.9% while the water absorptivity and solubility decreased by 51.49% and 60% compared to the PSG film. The Young’s modulus of the films incorporated with CuO and ZnO nanoparticles was lower than that reported for PVA, suggesting that the film possessed higher flexibility. The thermogravimetric analysis demonstrated high thermal stability for films. Biosynthesized CuO and ZnO nanoparticles exhibited antifungal activity against vegetable and fruit spoilage fungi, and hence the fabricated polymers incorporated with nanoparticles were anticipated to demonstrate an antifungal activity. The nanoparticle incorporated films exhibited fungicidal and bactericidal activity, suggesting their role in extending the shelf life of packaged food. The result of ICP-OES studies demonstrated the steady release of ions from the polymer films, however, EDX analysis demonstrated no leaching of CuO and ZnO nanoparticles from the films, thus ruling out the possibility of nanoparticles entering the packaged food. The strawberries wrapped with the fabricated films incorporated with nanoparticles demonstrated improved shelf life and retained the nutritional quality of the fruit. Among the four films, PSG–CuZn was the most promising for food wrapping since it exhibited better water-resistance, antimicrobial, thermal, and mechanical properties.

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Biswas, Sourav, Goutam Prasanna Kar i Suryasarathi Bose. "Attenuating microwave radiation by absorption through controlled nanoparticle localization in PC/PVDF blends". Physical Chemistry Chemical Physics 17, nr 41 (2015): 27698–712. http://dx.doi.org/10.1039/c5cp05189d.

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Swady, Elaaf Ali, i Mohammed K. Jawad. "Study FTIR and AC Conductivity of Nanocomposite Electrolytes". Iraqi Journal of Physics (IJP) 19, nr 51 (1.12.2021): 15–22. http://dx.doi.org/10.30723/ijp.v19i51.689.

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In the present work polymer electrolytes were formulated using the solvent casting technique. Under special conditions, the electrolyte content was of fixed ratio of polyvinylpyrolidone (PVP): polyacrylonitrile (PAN) (25:75), ethylene carbonate (EC) and propylene carbonate (PC) (1:1) with 10% of potassium iodide (KI) and iodine I2 = 10% by weight of KI. The conductivity was increased with the addition of ZnO nanoparticles. It is also increased with the temperature increase within the range (293 to 343 K). The conductivity reaches maximum value of about (0.0296 S.cm-1) with (0.25 g) ZnO. The results of FTIR for blend electrolytes indicated a significant degree of interaction between the polymer blend (PVP and PAN) and the KI salt. From the electrolyte observations of the nanocomposites, the broad peak became narrower after adding the ZnO nanoparticle to the KI salt. The dielectric reaction decreased with the increase of the frequency at room temperature. The high dielectric permittivity of the polymer at lower frequencies can be attributed to the dipoles having sufficient time to get aligned with the electric field, resulting in higher polarization.

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Saujanya, C., Ashamol, S. Padalkar i S. Radhakrishnan. "Control of nanoparticle size of fillers by polymer blend technique". Polymer 42, nr 5 (marzec 2001): 2255–58. http://dx.doi.org/10.1016/s0032-3861(00)00474-2.

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Ku, Kang Hee, Hyunseung Yang, Se Gyu Jang, Joona Bang i Bumjoon J. Kim. "Tailoring block copolymer and polymer blend morphology using nanoparticle surfactants". Journal of Polymer Science Part A: Polymer Chemistry 54, nr 2 (23.09.2015): 228–37. http://dx.doi.org/10.1002/pola.27899.

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Abdallah, H., M. S. Shalaby i A. M. H. Shaban. "Performance and Characterization for Blend Membrane of PES with Manganese(III) Acetylacetonate as Metalorganic Nanoparticles". International Journal of Chemical Engineering 2015 (2015): 1–9. http://dx.doi.org/10.1155/2015/896486.

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This study describes the preparation, characterization, and evaluation of performance of blend Polyethersulfone (PES) with manganese(III) acetylacetonate Mn(acac)3to produce reverse osmosis blend membrane. The manganese(III) acetylacetonate nanoparticles were prepared by a simple and environmentally benign route based on hydrolysis of KMnO4followed by reaction with acetylacetone in rapid stirring rate. The prepared nanoparticle powder was dissolved in polymer solution mixture to produce RO PES/Mn(acac)3blend membrane, without any treatment of Polyethersulfone membrane surface. The membrane morphology, mechanical properties, and performance were presented. The scanning electron microscopy (SEM) images have displayed a typical asymmetric membrane structure with a dense top layer due to the migration of Mn(acac)3nanoparticles to membrane surface during the phase inversion process. Contact angle measurements have indicated that the hydrophilicity of the membrane was improved by adding Mn(acac)3. AFM images have proved excellent pores size distribution of blend membrane and lower surface roughness compared with bare PES. The desalination test was applied to blend membrane, where the blend membrane provided good performance; particularly, permeate flux was 24.2 Kg/m2·h and salt rejection was 99.5%.

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Park, Jin Young, Yushin Park i Rigoberto C. Advincula. "Hybrid CdSe–dendron nanoparticle and polymer blend knodels at the interface". Soft Matter 7, nr 11 (2011): 5124. http://dx.doi.org/10.1039/c1sm05418j.

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Fuenteslópez, Carla V., i Hua Ye. "Electrospun Fibres with Hyaluronic Acid-Chitosan Nanoparticles Produced by a Portable Device". Nanomaterials 10, nr 10 (13.10.2020): 2016. http://dx.doi.org/10.3390/nano10102016.

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Electrospinning is a versatile technique to produce nano/microscale fibrous scaffolds for tissue engineering and drug delivery applications. This research aims to demonstrate that hyaluronic acid-chitosan (HA-CS) nanoparticles can be electrospun together with polycaprolactone (PCL) and gelatine (Ge) fibres using a portable device to create scaffolds for tissue repair. A range of polymer solutions of PCL-gelatine at different weight/volume concentrations and ratios were electrospun and characterised. Fibre–cell interaction (F11 cells) was evaluated based on cell viability and proliferation and, from here, a few polymer blends were electrospun into random or aligned fibre arrangements. HA-CS nanoparticles were synthesised, characterised, and used to functionalise electrospun fibres (8% w/v at 70 PCL:30 Ge), which were chosen based on cell viability. Different concentrations of HA-CS nanoparticles were tested to determine cytotoxicity. A single dosage (1 × 10−2 mg/mL) was associated with higher cell proliferation compared with the cell-only control. This nanoparticle concentration was embedded into the electrospun fibres as either surface modification or blend. Fibres with blended NPs delivered a higher cell viability than unmodified fibres, while NP-coated fibres resulted in a higher cell proliferation (72 h) than the NP-blended ones. These biocompatible scaffolds allow cell attachment, maintain fibre arrangement, promote directional growth and yield higher cell viability.

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Mohammed, Ali Jasim, i Sameer H. Al-nesrawy. "Nano Ferrite Incorporated Poly (Vinyl Pyrrolidone (PVP) /Poly (Vinyl Alcohol (PVA) Blend: Preparation and Investigation of Structural, Morphological and Optical Properties". NeuroQuantology 20, nr 4 (6.04.2022): 251–58. http://dx.doi.org/10.14704/nq.2022.20.3.nq22087.

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In this paper, the ferrite Cux Ni1-x FeO3 when (x=0.1) has been prepared by the co-precipitation method and examined through the XRD -diffraction and confirming the face center cubic spinel phase (FCC) which attributed to the ferrite and found that these materials was Nano-scale. Then with different content of ferrite nanoparticle (1, 3and 5 wt.%) additive to the (PVP/PVA) polymer matrix to synthesis (PVP/PVA/ferrite) nanocomposite by using casting method and study the Fourier transformation infrared (FTIR), (FE-SEM) and UV-Vis. Spectrophotometer. The FTIR confirming that there is no interactions between (PVP/PVA) polymer matrix and ferrite nanoparticles for all the sample prepared. From FESEM, the uniform morphology dispersed of ferrite inside the PVP/PVA blend with spherically shaped nanoparticles and the average grain size increased with increasing of concentration of ferrite. The absorption, absorption coefficient, transmittance and indirect energy band gap has been investigate.

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Naik, Ishwar, Rajashekhar Bhajantri, B. S. Patil i Vinayak Bhat. "Fullerene (PCBM) Modulated MEH-PPV Photoactive Material for Plastic Solar Cells". Materials Science Forum 969 (sierpień 2019): 439–43. http://dx.doi.org/10.4028/www.scientific.net/msf.969.439.

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Abstract.Plastic solar cells are promising devices in looking for low cost and flexible energy storing devices. Low efficiency is the main drawback of these cells in comparison with inorganic solar cells and hence the search for an efficient plastic solar cell has become a globally demanded research problem. In the present work we have used the modified fullerene [6,6]-Phenyl C61 butyric acid methyl ester (PCBM) as N type modulating probe on P type semiconducting polymer Poly[2-methoxy-5-(2’-ethylhexyloxy)-phenylenevinylene] (MEH-PPV). The donor MEH-PPV polymer matrix is modulated by adding PCBM in the weight ratio 1:3, 1:1 and 3:1 in Chloro-Benzene(CB) as the common solvent and glass-coated samples are prepared by solution cast method. Samples are analyzed by UV-VISIBLE spectroscopy by JASCO UV Vis NIR V 670 spectrometer. The effect of PCBM content on MEH-PPV is to broaden the spectral response of MEH-PPV. In other words the acceptor PCBM has tuned the band gap (energy difference between HOMO & LUMO) of the donor MEH-PPV. Spectral analysis revealed that 1:3 blend of MEH-PPV with PCBM has a wide spectral sensitivity for absorption. The band gap for each blend is determined using Tauc’s plot. Increased Fullerene content has decreased the band gap of the host polymer. We conclude that modified fullerene can effectively modulate the donor polymer matrix and 1:3 MEH-PPV: PCBM can act as a good photoactive material for solar cells. Absorption can be further enhanced by either dye sensitization or by metal oxide nanoparticle doping without increasing the thickness of the film. We have doped the optimized 1:3 blend with 20%, 40% & 60% of TiO2 nanoparticles wherein the absorption is enhanced with doping level. The increased absorption is attributed to the photocatalytic activity of the nanaoparticles embedded in the polymer matrix

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Sierra-Ávila, Rubén, Marissa Pérez-Alvarez, Janett Valdez-Garza, Carlos Alberto Avila-Orta, Enrique Javier Jiménez-Regalado, José M. Mata-Padilla, Enrique Soto-Castruita i Gregorio Cadenas-Pliego. "Synthesis and Thermomechanical Characterization of Nylon 6/Cu Nanocomposites Produced by an Ultrasound-Assisted Extrusion Method". Advances in Materials Science and Engineering 2018 (13.11.2018): 1–10. http://dx.doi.org/10.1155/2018/4792735.

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A nylon 6 nanocomposite with copper nanoparticles processed by ultrasound-assisted extrusion was prepared at concentrations between 0.01 and 0.50 wt.%, and its thermal and mechanical properties were determined. The presence of the crystalline phase α (α1 and α2) in the polymer matrix was confirmed by X-ray diffraction, and the presence of the α2 phase showed a greater increase than the α1 phase as a function of the copper nanoparticle concentration. This process was attributed to secondary crystallization. Furthermore, it was determined that the chemical composition of the nanoparticles is a blend of metallic copper and cupric oxide. The formation of copper nanowires was observed by scanning electron microscopy, and the concentration of 0.10% exhibited the best dispersion in comparison with the other concentrations. The melting temperature of the nanocomposites underwent a slight decrease in comparison with the nylon 6, while thermal stability, crystallization temperature, and crystallinity were increased in relation to the pure polymer. This behavior is attributed to an efficient dispersion of the nanoparticles and to their functionality as crystal nucleation sites. For the 0.10% concentration nanocomposite, higher mechanical properties were obtained; tensile strength increased by 8.9%, and the tensile modulus increased by 25.4%; as a consequence, elongation at break was 62% less than that of the polymer matrix.

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Huq, Abul F., Irina Zvonkina, Abdullah M. Al-Enizi i Alamgir Karim. "Controlling nanoparticle crystallinity and surface enrichment in polymer (P3HT)/Nanoparticle(PCBM) blend films with tunable soft confinement". Polymer 136 (styczeń 2018): 37–46. http://dx.doi.org/10.1016/j.polymer.2017.12.037.

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Tao, Fangfang, Bernard Nysten, Anne-Christine Baudouin, Jean-Michel Thomassin, Daniela Vuluga, Christophe Detrembleur i Christian Bailly. "Influence of nanoparticle–polymer interactions on the apparent migration behaviour of carbon nanotubes in an immiscible polymer blend". Polymer 52, nr 21 (wrzesień 2011): 4798–805. http://dx.doi.org/10.1016/j.polymer.2011.08.035.

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Athimoolam, M., Logeshkumar, Suresh Babu i T. V. Moorthy. "Tensile Behaviour of Nanoparticle Reinforced Epoxy-Polyurethane Composite Water Pipeline". Applied Mechanics and Materials 813-814 (listopad 2015): 127–34. http://dx.doi.org/10.4028/www.scientific.net/amm.813-814.127.

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Abstract. The pipelines for offshore water applications are made of Polyurethane (PU) or polyurethane coated. Most of the shape memory polymer composites are made with polyurethane resin, which has poor mechanical properties. Thus it is blend with epoxy resin (EP), because epoxy resin has got good mechanical properties. So designing a suitable composite for shape memory application with improved mechanical properties has become important as it can be used in offshore pipelines for several years. Since epoxy resin has got good mechanical properties, the hardness of the Nanocomposite composed of the heat treated clay powder dramatically increased as a function of clay content, which is attributed to the homogeneous dispersion of the Nano fillers in the polymer matrix and strong filler–polymer interactions. Mechanical properties of the attapulgite clay reinforced polyurethane shape-memory Nanocomposite are strongly dependent on the pre-treatment of the Nano-powders.The energy consumption for actuation and ability to remember two or multiple shapes and the knowledge of the glass transition temperature are very important for the characterization of the composite materials. In this work, the developed composite material is compared with a existing polyurethane composite with the help of Tensile test. It has been observed that the developed composite material strength increases abruptly compared to pipelines made of polyurethane.

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Nguyen, Phuong Hoai Nam, i Nang Dinh Nguyen. "Green light-emitting diodes based on a hybrid TiO 2 nanoparticle-conducting polymer blend". Advances in Natural Sciences: Nanoscience and Nanotechnology 2, nr 3 (15.07.2011): 035012. http://dx.doi.org/10.1088/2043-6262/2/3/035012.

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Shebert, George L., i Yong Lak Joo. "Effect of elongational flow on immiscible polymer blend/nanoparticle composites: a molecular dynamics study". Soft Matter 12, nr 28 (2016): 6132–40. http://dx.doi.org/10.1039/c6sm00619a.

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Hamisu, Abubakar, i Sevim Ünügür Çelik. "Polymer composite electrolyte of SPSU(Na)/PPEGMA/hBN for sodium-ion batteries". Polymers and Polymer Composites 27, nr 7 (15.05.2019): 419–28. http://dx.doi.org/10.1177/0967391119848531.

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Polymer composite electrolyte based on polysulfone-sodium sulfonate (SPSU(Na)) blended with poly (polyethylene glycol methacrylate) (PPEGMA) using nano-sized hexagonal boron nitride (nano-hBN) as filler was fabricated using a solution casting technique for use in Na-ion batteries. Polysulfone was sulfonated by a post sulfonation method followed by ion exchange with sodium hydroxide. Fourier transform infrared spectroscopy was used to study SPSU(Na)/PEGMA blend and incorporation of hBN nanoparticle into the SPSU(Na)/PPEGMA blend. Thermal properties of the composites were studied with thermogravimetric analysis (TGA) and differential scanning calorimetry tests. X-ray diffraction was used to study phase change. The TGA curve showed two weight loss regions, where 30% weight loss occurred between 200°C and 350°C due to degradation of sulfonic acid groups, and the polymer backbone degradation occurs above 500°C. Surface morphology of the membranes was examined using scanning electron microscopy which reveals the homogeneous dispersion of the nano-hBN particles in the polymer matrix. Ionic conductivity was studied with impedance spectroscopy and the total ionic conductivity increases with increasing PPEGMA ratio. SPSU(Na)/PPEGMA(1:4) sample showed maximum ion conductivity of approximately 5.5 × 10−6 S cm−1 (5.5 × 10−4 S m−1) at 100°C because of the high content of PPEGMA.

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Benmouna, A., R. Benmouna, M. R. Bockstaller i I. F. Hakem. "Self-Organization Schemes towards Thermodynamic Stable Bulk Heterojunction Morphologies: A Perspective on Future Fabrication Strategies of Polymer Photovoltaic Architectures". Advances in Physical Chemistry 2013 (16.04.2013): 1–8. http://dx.doi.org/10.1155/2013/948189.

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Research efforts to improve our understanding of electronic polymers are developing fast because of their promising advantages over silicon in photovoltaic solar cells. A major challenge in the development of polymer photovoltaic devices is the viable fabrication strategies of stable bulk heterojunction architecture that will retain functionality during the expected lifetime of the device. Block copolymer self-assembly strategies have attracted particular attention as a scalable means toward thermodynamically stable microstructures that combine the ideal geometrical characteristics of a bulk heterojunction with the fortuitous combination of properties of the constituent blocks. Two primary routes that have been proposed in the literature involve the coassembly of block copolymers in which one domain is a hole conductor with the electron-conducting filler (such as fullerene derivatives) or the self-assembly of block copolymers in which the respective blocks function as hole and electron conductor. Either way has proven difficult because of the combination of synthetic challenges as well as the missing understanding of the complex governing parameters that control structure formation in semiconducting block copolymer blends. This paper summarizes important findings relating to structure formation of block copolymer and block copolymer/nanoparticle blend assembly that should provide a foundation for the future design of block copolymer-based photovoltaic systems.

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Sharma, Shikha, i Fehmeeda Khatoon. "Bio-Synthesis and Characterization of CS–Ag Nano Hydrogel for Antibacterial Application". Advanced Science, Engineering and Medicine 12, nr 4 (1.04.2020): 542–47. http://dx.doi.org/10.1166/asem.2020.2543.

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An environmental technique of herbal mediated blend of Ag nanoparticles is a substantial stage in the ground of nanotechnology. Chitosan (CS) is a polymer which is biocompatible and antibacterial. In this work, we have synthesized CS–Ag Nano hydrogel which is form with chitosan-based hydrogel merged in the herbal synthesized Ag nanoparticles. These green synthesized Ag-nanoparticles made from Polygonum bistorta plant leaves and described with the assistance of UV-vis spectrophotometer, and Dynamic Light Scattering (DLS). In this work our main focus to synthesized CS–Ag Nano hydrogel. These hydrogel was described by Fourier transform infrared (FTIR) spectroscopic method, X-ray diffraction (XRD) method, and contact angle. Nanoparticle size distribution was within 1 to 100 nm by DLS and the optimum wavelength was noted in 400 to 450 nm by UV-vis spectroscopic readings. A good antibacterial behavior has been displayed by these synthesized CS–Ag Nano hydrogel films against both E. coli (gram –ve) and S. aureus (gram +ve) with the maximum 7 mm inhibition zone.

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Dhanasekar, K., A. Mohana Krishnan, Gopal Kaliyaperumal, Melvin Victor De Poures, P. Chandramohan, N. Parthipan, C. B. Priya, R. Venkatesh i Kassu Negash. "Influences of Nanosilica Particles on Density, Mechanical, and Tribological Properties of Sisal/Hemp Hybrid Nanocomposite". Advances in Polymer Technology 2023 (15.05.2023): 1–7. http://dx.doi.org/10.1155/2023/3684253.

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Focusing on natural fibers are the prominent substitution for synthetic fiber and reinforced into polymer matrices found unique properties such as lightweight, cost-effectiveness, and good mechanical and wear properties. Incompatibility and low adhesive behavior are the primary drawbacks found during the fabrication of natural fiber-bonded polymer matrix composites. The constant weight percentage (10 wt%) of sisal and hemp fiber is treated with a 5% NaOH solution for improving adhesive behavior and bonded with epoxy. The prepared sisal/hemp/epoxy combination is blended with 0 wt%, 3 wt%, 6 wt%, and 9 wt% silica nanoparticles, which results in reduced voids (1.32%) and increased flexural strength (56.98 MPa). Based on the compositions of fiber and reinforcement, the density of the composite varied. Samples 3-6 wt% of silica nanoparticle-blend sisal/hemp/epoxy composite offered maximum tensile and impact strength of 52.16 MPa and 2.1 J. An optical microscope analyzed the tensile fracture surface, and the failure nature was reported. The dry sliding wear performance of composite samples is tested by pin-on-disc setup with a 10 N-40 N load of 10 N interval at 0.75 m/sec. Sample 3 found good wear resistance compared to others.

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Wu, Wenjie, Maninderjeet Singh, Ali Masud, Xiaoteng Wang, Asritha Nallapaneni, Zihan Xiao, Yue Zhai i in. "Control of Phase Morphology of Binary Polymer Grafted Nanoparticle Blend Films via Direct Immersion Annealing". ACS Nano 15, nr 7 (13.07.2021): 12042–56. http://dx.doi.org/10.1021/acsnano.1c03357.

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Xu, Haihua, Ying Lv, Haoxuan Zeng, Dexing Qiu, Yican Chu i Qingqing Zhu. "Flexible and Broad-Spectral Hybrid Optical Modulation Transistor Based on a Polymer–Silver Nanoparticle Blend". ACS Applied Materials & Interfaces 10, nr 31 (16.07.2018): 26586–93. http://dx.doi.org/10.1021/acsami.8b06307.

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Hongsriphan, N., J. Nualyung, N. Yaothaisong i P. Patanathabutr. "Antibacterial coating of corona treated Poly(lactic acid) / Poly(butylene succinate) film with Chitosan and Zinc oxide nanoparticle". IOP Conference Series: Materials Science and Engineering 1280, nr 1 (1.04.2023): 012001. http://dx.doi.org/10.1088/1757-899x/1280/1/012001.

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Abstract The biodegradable PLA/PBS 90/10 wt% films were extruded and surface treated with corona discharge. Two electrical inputs of the corona treatment were used, 2 or 6 amperes, which the change of the surface tension was evaluated using corona measuring pens. The blend films were coated with the antibacterial mixture between chitosan and zinc oxide nanoparticles (ZnO-NP) in four concentrations: 1.0/0.4, 1.0/0.5, 1.5/0.5, and 1.5/0.5 wt%/wt%. This film could be used to replace transparent disposable packaging in the circular economy. It was found that the surface tension of the blend film was 30 dyne (mN/m) which was much like the neat PLA due to PLA being the main composition. Since the overall coated film thickness was kept constant, there was no significant difference in the coating weight among four coating concentrations. Compared to the uncoated PLA/PBS film, the tensile strength of the coated films tended to be higher with the increase of ZnO-NP content. However, the elongation at break of the coated films decreased significantly, which the stiffer coating layers became the stress concentrators. From SEM, it was seen that the good adhesion between the polymer and the coating layer was achieved. When the coated films were torn apart in the trouser tear testing, the failure was the breakage of the blend film with there was some coating layer delaminated.

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Minelli, Caterina, Christoph Frommen, Christian Hinderling, Raphael Pugin, Harry Heinzelmann i Martha Liley. "The influence of nanoparticle fillers on the morphology of a spin-cast thin film polymer blend". Colloid and Polymer Science 284, nr 5 (29.10.2005): 482–88. http://dx.doi.org/10.1007/s00396-005-1406-2.

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Hammani, Salim, Sihem Daikhi, Mikhael Bechelany i Ahmed Barhoum. "Role of ZnO Nanoparticles Loading in Modifying the Morphological, Optical, and Thermal Properties of Immiscible Polymer (PMMA/PEG) Blends". Materials 15, nr 23 (27.11.2022): 8453. http://dx.doi.org/10.3390/ma15238453.

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High-performance hybrid polymer blends can be prepared by blending different types of polymers to improve their properties. However, most polymer blends exhibit phase separation after blending. In this study, polymethylmethacrylate/polyethylene glycol (PMMA/PEG) polymer blends (70/30 and 30/70 w/w) were prepared by solution casting with and without ZnO nanoparticles (NPs) loading. The effect of loading ZnO nanoparticles on blend morphology, UV blocking, glass transition, melting, and crystallization were investigated. Without loading ZnO NP, the PMMA/PEG blends showed phase separation, especially the PEG-rich blend. Loading PMMA/PEG blend with ZnO NPs increased the miscibility of the blend and most of the ZnO NPs dispersed in the PEG phase. The interaction of the ZnO NPs with the blend polymers slightly decreased the intensity of infrared absorption of the functional groups. The UV-blocking properties of the blends increased by 15% and 20%, and the band gap energy values were 4.1 eV and 3.8 eV for the blends loaded with ZnO NPs with a PMMA/PEG ratio of 70/30 and 30/70, respectively. In addition, the glass transition temperature (Tg) increased by 14 °C, the crystallinity rate increased by 15%, the melting (Tm) and crystallization(Tc) temperatures increased by 2 °C and 14 °C, respectively, and the thermal stability increased by 25 °C compared to the PMMA/PEG blends without ZnO NP loading.

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REZANOVA, NATALIA, YURII BUDASH, VIKTORIIA PLAVAN, ALLA KORSHUN i SERHII PRYSTYNSKYI. "РЕГУЛЮВАННЯ СТІЙКОСТІ РІДКИХ МІКРОСТРУМЕНІВ ПОЛІПРОПІЛЕНУ В МАТРИЦІ СПІВПОЛІАМІДУ ЗА РАХУНОК НАНОДОБАВОК". Technologies and Engineering, nr 2 (24.12.2021): 60–69. http://dx.doi.org/10.30857/2786-5371.2021.2.6.

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Goal. Investigation of the effect of the concentration of nanoparticles of aluminum oxide (Al2O3) and alumina modified with silver (Ag/Al2O3) on the decomposition kinetics of liquid microjets of polypropylene (PP) in a copolyamide (CPA) matrix and the possibility of controlling the microfibrillar morphology of the PP/CPA blend.Methodology. The components of the blend were mixed on a screw-disk extruder. The kinetics of the disintegration of liquid microjets was studied using a technique based on the theory of destabilization of a liquid cylinder under the action of capillary waves. The degree of dispersion of polypropylene in the matrix was evaluated by photomicrographs of cross sections of the extrudates of the blends.Results. Nanoadditives of the original and silver-modified aluminum oxide with a content of (0.1 ÷ 3.0) wt.% In the blend increase the compatibility of the components: the surface tension (γαβ) in the compositions of all compositions decreases. Ag/Al2O3 nanoparticles are more effective than aluminum oxide nanoparticles - the γαβ value decreases by 9.6 and 5.3 times, respectively, which ensures a high degree of dispersion of the dispersed phase component in the matrix. The disintegration resistance of polypropylene microjets is increasing, as evidenced by a decrease in the instability coefficient (q) and an increase in the microjet lifetime (tl). The curves of q and tl dependence on the additive content have an extreme character. The minimum values of the instability coefficient of microjets and the maximum values of their lifetime are achieved at a nanoparticle concentration corresponding to the lowest interfacial tension.Scientific novelty. The positive effect of the investigated nanoadditives on the kinetics of the decomposition of liquid microjets of polypropylene in the copolyamide matrix has been established. The highest modifying effect in the presence of Ag/Al2O3 nanoparticles is due to their amphiphilic nature, which ensures the predominant localization of nanoparticles at the interface and a synergistic increase in the degree of compatibility in the PP/CPA system.Practical significance. The regularities of increasing the stability of liquid microjets to disintegration in polymer blends filled with nanoparticles have been established, which will make it possible to determine the parameters of the processes of mixing and forming fibers and films, in which the microfibrillar structure arising during the flow of the melt will remain unchanged in the products.

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Sun, Hai Tao, Sa Zhang, Hui Yong Deng, Kai Bo Cui i Fang Zhao. "Microwave Absorption Properties of Porous Co/C Nanofibers Synthesized by Electrospinning". Materials Science Forum 975 (styczeń 2020): 133–38. http://dx.doi.org/10.4028/www.scientific.net/msf.975.133.

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Porous Co/C composite nanofibers were fabricated by combination of electrospinning method and polymer blend. The phase composition, microstructure and electromagnetic characteristics of them were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM) and vector network analyzer (VNA), and their microwave absorption performances were studied. The results indicate that nanofibers were composited by amorphous carbon and face-centered cubic structured Co nanoparticle after sintering. The addition of PMMA is a key factor of nanofibers morphology and the aperture was improved with the increase of PMMA. When the thickness is 2.0 mm, the samples exhibit the best microwave absorption performance. Their effective absorpt ion bandwidths (RL < 10 dB) are 6.3 GHz, 6.2 GHz and 6.1 GHz, and it’s obviously superior to ordinary morphology nanofibers.

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Dutta, Achintya, Ramakrishna Nayak, M. Selvakumar, Dheeraj Devadiga, P. Selvaraj i S. Senthil Kumar. "Graphite/copper nanoparticle-based high-performance micro supercapacitor with porous wet paper-based PVA-PVP blend polymer electrolyte". Materials Letters 295 (lipiec 2021): 129849. http://dx.doi.org/10.1016/j.matlet.2021.129849.

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Andriolo, Jessica M., Nathan J. Sutton, John P. Murphy, Lane G. Huston, Emily A. Kooistra-Manning, Robert F. West, Marisa L. Pedulla, M. Katie Hailer i Jack L. Skinner. "Electrospun Fibers for Controlled Release of Nanoparticle-Assisted Phage Therapy Treatment of Topical Wounds". MRS Advances 3, nr 50 (2018): 3019–25. http://dx.doi.org/10.1557/adv.2018.483.

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ABSTRACTBacterial cultures exposed to iron-doped apatite nanoparticles (IDANPs) prior to the introduction of antagonistic viruses experience up to 2.3 times the bacterial destruction observed in control cultures. Maximum antibacterial activity of these bacteria-specific viruses, or phage, occurs after bacterial cultures have been exposed to IDANPs for 1 hr prior to phage introduction, demonstrating that IDANP-assisted phage therapy would not be straight forward, but would instead require controlled time release of IDANPs and phage. These findings motivated the design of an electrospun nanofiber mesh treatment delivery system that allows burst release of IDANPs, followed by slow, consistent release of phage for treatment of topical bacterial infections. IDANPs resemble hydroxyapatite, a biocompatible mineral analogous to the inorganic constituent of mammalian bone, which has been approved by the Food and Drug Administration for many biomedical purposes. The composite nanofiber mesh was designed for IDANP-assisted phage therapy treatment of topical wounds and consists of a superficial, rapid release layer of polyethylene oxide (PEO) fibers doped with IDANPs, followed by inner, coaxial polycaprolactone / polyethylene glycol (PCL/PEG) blended polymer fiber layer for slower phage delivery. Our investigations have established that IDANP-doped PEO fibers are effective vehicles for dissemination of IDANPs for bacterial exposure and resultant increased bacterial death by phage. In this work, slower delivery of the phage behind IDANPs was accomplished using coaxial, electrospun fibers composed of PCL/PEG polymer blend.

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Vidakis, Nectarios, Markos Petousis, Emmanouel Velidakis, Marco Liebscher i Lazaros Tzounis. "Three-Dimensional Printed Antimicrobial Objects of Polylactic Acid (PLA)-Silver Nanoparticle Nanocomposite Filaments Produced by an In-Situ Reduction Reactive Melt Mixing Process". Biomimetics 5, nr 3 (2.09.2020): 42. http://dx.doi.org/10.3390/biomimetics5030042.

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In this study, an industrially scalable method is reported for the fabrication of polylactic acid (PLA)/silver nanoparticle (AgNP) nanocomposite filaments by an in-situ reduction reactive melt mixing method. The PLA/AgNP nanocomposite filaments have been produced initially reducing silver ions (Ag+) arising from silver nitrate (AgNO3) precursor mixed in the polymer melt to elemental silver (Ag0) nanoparticles, utilizing polyethylene glycol (PEG) or polyvinyl pyrrolidone (PVP), respectively, as macromolecular blend compound reducing agents. PEG and PVP were added at various concentrations, to the PLA matrix. The PLA/AgNP filaments have been used to manufacture 3D printed antimicrobial (AM) parts by Fused Filament Fabrication (FFF). The 3D printed PLA/AgNP parts exhibited significant AM properties examined by the reduction in Staphylococcus aureus (S. aureus) and Escherichia coli (E. coli) bacteria viability (%) experiments at 30, 60, and 120 min duration of contact (p < 0.05; p-value (p): probability). It could be envisaged that the 3D printed parts manufactured and tested herein mimic nature’s mechanism against bacteria and in terms of antimicrobial properties, contact angle for their anti-adhesive behavior and mechanical properties could create new avenues for the next generation of low-cost and on-demand additive manufacturing produced personal protective equipment (PPE) as well as healthcare and nosocomial antimicrobial equipment.

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Ibrahim, Idowu David, Tamba Jamiru, Emmanuel Rotimi Sadiku, Williams Kehinde Kupolati i Stephen Chinenyeze Agwuncha. "Impact of Surface Modification and Nanoparticle on Sisal Fiber Reinforced Polypropylene Nanocomposites". Journal of Nanotechnology 2016 (2016): 1–9. http://dx.doi.org/10.1155/2016/4235975.

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The use of plant fibers, polymer, and nanoparticles for composite has gained global attention, especially in the packaging, automobile, aviation, building, and construction industries. Nanocomposites materials are currently in use as a replacement for traditional materials due to their superior properties, such as high strength-to-weight ratio, cost effectiveness, and environmental friendliness. Sisal fiber (SF) was treated with 5% NaOH for 2 hours at 70°C. A mixed blend of sisal fiber and recycled polypropylene (rPP) was produced at four different fiber loadings: 10, 20, 30, and 40 wt.%, while nanoclay was added at 1, 3, and 5 wt.%. Maleic anhydride grafted polypropylene (MAPP) was used as the compatibilizer for all composites prepared except the untreated sisal fibers. The characterization results showed that the fiber treatment, addition of MAPP, and nanoclay improved the mechanical properties and thermal stability and reduced water absorption of the SF/rPP nanocomposites. The tensile strength, tensile modulus, and impact strength increased by 32.80, 37.62, and 5.48%, respectively, when compared to the untreated SF/rPP composites. Water absorption was reduced due to the treatment of fiber and the incorporation of MAPP and nanoclay.

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Al-Saleh, Samar, Abdullah Alateeq, Abdulaziz H. Alshaya, Amal S. Al-Qahtani, Huda I. Tulbah, Mashael Binhasan, Sara Shabib, Imran Farooq, Fahim Vohra i Tariq Abduljabbar. "Influence of TiO2 and ZrO2 Nanoparticles on Adhesive Bond Strength and Viscosity of Dentin Polymer: A Physical and Chemical Evaluation". Polymers 13, nr 21 (2.11.2021): 3794. http://dx.doi.org/10.3390/polym13213794.

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The present study aimed to formulate an experimental adhesive (EA) and reinforce it with 5 wt.% titanium dioxide (TiO2) or zirconium oxide (ZrO2) to yield 5% TiO2 and 5% ZrO2 adhesives, respectively, and then analyze the impact of this reinforcement on various mechanical properties of the adhesives. The EA contained a blend of monomers such as bisphenol A glycol dimethacrylate (BisGMA), triethylene glycol dimethacrylate (TEGDMA), 2-hydroxyethyl methacrylate (HEMA), and ethyl 4-dimethylamino benzoate and camphorquinone. The EA included ethyl 4-dimethylamino benzoate and camphorquinone photo-initiators, and diphenyliodonium hexafluorophosphate (DPIHP) was also included to act as an electron initiator. The TiO2 and ZrO2 nanoparticles were incorporated into the EA post-synthesis. To characterize the filler nanoparticles, scanning electron microscopy (SEM) and line-energy dispersive X-ray (EDX) spectroscopy were performed. The adhesives were characterized by analyzing their rheological properties, shear-bond strength (SBS), and interfacial failure types. Further, the resin–dentin interface was also analyzed via SEM. The TiO2 nanoparticles were spherically shaped on the SEM micrographs, while the ZrO2 nanoparticles were seen as non-uniformly shaped agglomerates. The EDX mapping demonstrated the presence of Ti and oxygen for TiO2 and Zr and oxygen for the ZrO2 nanoparticles. Both 5% TiO2 and 5% ZrO2 adhesives revealed decreased viscosity as compared with the EA. The 5% TiO2 adhesive demonstrated higher SBS values for both non-thermocycled (NTC) and thermocycled samples (NTC: 25.35 ± 1.53, TC: 23.89 ± 1.95 MPa), followed by the 5% ZrO2 adhesive group (NTC: 23.10 ± 2.22, TC: 20.72 ± 1.32 MPa). The bulk of the failures (>70%) were of adhesive type in all groups. The SEM analysis of the resin–dentin interface revealed the development of a hybrid layer and resin tags (of variable depth) for the EA and 5% TiO2 groups. However, for the 5% ZrO2 group, the hybrid layer and resin tag establishment appeared compromised. Reinforcement of the EA with TiO2 or ZrO2 caused an increase in the adhesive’s SBS (with the 5% TiO2 group demonstrating the highest values) in comparison with the EA (without nanoparticles). However, both nanoparticle-containing adhesives revealed decreased viscosity compared with the EA (without nanoparticles). Further studies investigating the impact of diverse filler concentrations on the properties of adhesives are suggested.

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Chen, Xin, Qiyan Zhang, Ziyu Liu, Yifei Sun i Q. M. Zhang. "High dielectric response in dilute nanocomposites via hierarchical tailored polymer nanostructures". Applied Physics Letters 120, nr 16 (18.04.2022): 162902. http://dx.doi.org/10.1063/5.0087495.

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This paper presents a hierarchically designed polymer nanocomposite approach in which nanofillers at ultralow volume loading generate large dielectric enhancement in blends of high temperature dielectric polymers with tailored nanostructures. We blend poly(1,4-phenylenen ether sulfone) (PES) with polymers, such as polyetherimide (PEI), that possess more coiled chain conformations to tailor polymer nano-morphologies. Making use of such blends as the matrix, dilute nanocomposites with 0.65 vol. % loading of alumina nanoparticles (20 nm size) generate a marked enhancement in dielectric performance, i.e., raising the dielectric constant K from PES K = 3.9 (and PEI K = 3.2) to the dilute nanocomposites K = 7.6, a much higher enhancement compared with the dilute nanocomposites employing neat polymers as the matrix. The results show that polymer blends with tailored nano-morphologies as the matrix can lead to higher dielectric enhancement in dilute nanocomposites compared with neat polymers as the matrix.

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