Artigos de revistas: "Polyethylene oxide (POE)"

1

Han, S. D., G. Campet, S. Y. Huang, M. C. R. Shastry, J. Portier, J. C. Lassègues e H. S. Dweik. "A New Method for the Preparation of Fine-Grained SnO2and WO3Powders: Influence of the Crystallite Size on the Electrochemical Insertion of Li+in SnO2and WO3Electrodes". Active and Passive Electronic Components 18, n.º 1 (1995): 39–51. http://dx.doi.org/10.1155/1995/79465.

Texto completo da fonte

Resumo:

We propose an unconventional method to obtain fine-grained SnO2and WO3powders. It uses as precursors, polymer complexes between polyethylene oxide (POE) and SnCl4or WCl6respectively. By pyrolysis of these complexes in the 350-550℃ temperature range, metal-oxide powders possessing small crystallite sizes are obtained. They are free from water and hydroxyl group contaminations, which is an added advantage where the application of these materials to Li-batteries is concerned. We have, indeed, demonstrated that these powders show good ability to insert reversibly lithium ions in the Li/ Li+/SnO2(WO3) cells.

Estilos ABNT, Harvard, Vancouver, APA, etc.

2

Oliveira, M., Ana Vera Machado e Regina Nogueira. "Development of Permeable Reactive Barrier for Phosphorus Removal". Materials Science Forum 636-637 (janeiro de 2010): 1365–70. http://dx.doi.org/10.4028/www.scientific.net/msf.636-637.1365.

Texto completo da fonte

Resumo:

Permeable reactive barriers were developed for phosphorus removal. The barrier consists in an organic-inorganic hybrid material, which allows water and others species to flow through it, while selectively removes the contaminants. Polyethylene oxide (POE) and aluminium oxide (Al2O3) were used as the organic and the inorganic parts, respectively. The hybrid material was obtained by sol-gel reaction, using aluminium isopropoxide as inorganic percursor in order to attain Al2O3. The hybrid material produced was characterized by FT-IR spectroscopy and thermogravimetry. The previous tests for phosphorus removal have shown the effectiveness capacity of the developed material to remove it.

Estilos ABNT, Harvard, Vancouver, APA, etc.

3

Meng, Zhenghua, Boyu Cao, Wei Guo, Yetao Zhong, Bin Li, Changhao Chen, Hengren Hu, Shigang Wu e Zhilin Xia. "A Scalable Heat Pump Film with Zero Energy Consumption". Polymers 15, n.º 1 (29 de dezembro de 2022): 159. http://dx.doi.org/10.3390/polym15010159.

Texto completo da fonte

Resumo:

Radiative cooling is an effective technology with zero energy consumption to alleviate climate warming and combat the urban heat island effect. At present, researchers often use foam boxes to isolate non-radiant heat exchange between the cooler and the environment through experiments, so as to achieve maximum cooling power. In practice, however, there are challenges in setting up foam boxes on a large scale, resulting in coolers that can be cooled below ambient only under low convection conditions. Based on polymer materials and nano-zinc oxide (nano-ZnO, refractive index > 2, the peak equivalent spherical diameter 500 nm), the manufacturing process of heat pump film (HPF) was proposed. The HPF (4.1 mm thick) consists of polyethylene (PE) bubble film (heat transfer coefficient 0.04 W/m/K, 4 mm thick) and Ethylene-1-octene copolymer (POE) cured nano-ZnO (solar reflectance ≈94% at 0.075 mm thick). Covering with HPF, the object achieves 7.15 °C decreasing in normal natural environment and 3.68 °C even under certain circumstances with high surface convective heat transfer (56.9 W/m2/K). HPF has advantages of cooling the covered object, certain strength (1.45 Mpa), scalable manufacturing with low cost, hydrophobic characteristics (the water contact angle, 150.6°), and meeting the basic requirements of various application scenarios.

Estilos ABNT, Harvard, Vancouver, APA, etc.

4

Liang, Yuxin, Tianle Zheng, Kun Sun, Zhuijun Xu, Tianfu Guan, Fabian A. C. Apfelbeck, Pan Ding et al. "Real-Time Monitoring of Electrochemical Reactions in All-Solid-State Lithium Batteries by Simultaneous Grazing-Incidence Small-Angle/Wide-Angle X-Ray Scattering". ECS Meeting Abstracts MA2024-01, n.º 2 (9 de agosto de 2024): 341. http://dx.doi.org/10.1149/ma2024-012341mtgabs.

Texto completo da fonte

Resumo:

Polyethylene oxide (PEO)-based composite electrolytes (PCEs) are considered as the promising candidates for next generation lithium metal batteries due to its high safety, easy fabrication and good electrochemical stability. However, the material suffers from low conductivity and high crystallinity of the ethylene oxide (EO) chain, which inhibits its commercialization. Therefore, it is crucial to understand the electrochemcial process as well as Li+ transfer pathway within PEO-based batteries. Using operando grazing-incidence small-angle and wide-angle X-ray scattering (GISAXS and GIWAXS) in Li||Cu cell framework, we find that the electrochemical reaction within the PCE is highly correlated with the evolution of the buried morphology and crystalline structure evolution of the PCE. This two irreversible reactions, PEO-Li+ reduction and TFSI- decomposition, cause changes in both the crystalline structure and morphology of the PCE. In addition, the reversible Li plating/stripping process alters the inner morphology, especially the PEO-LiTFSI domain radius, rather than causing crystalline structure changes. This work provides a new path to monitor a working battery in real time, thereby enabling detailed understanding of electrochemically-induced changes of the microscopic morphology and crystalline structure of PCE, which is essential for developing high transferable and interface stable PCE-based lithium metal batteries. Figure 1

Estilos ABNT, Harvard, Vancouver, APA, etc.

5

Lee, Kyoung-Jin, Eun-Jeong Yi, Gangsanin Kim e Haejin Hwang. "Synthesis of Ceramic/Polymer Nanocomposite Electrolytes for All-Solid-State Batteries". Journal of Nanoscience and Nanotechnology 20, n.º 7 (1 de julho de 2020): 4494–97. http://dx.doi.org/10.1166/jnn.2020.17562.

Texto completo da fonte

Resumo:

Lithium-ion conducting nanocomposite solid electrolytes were synthesized from polyethylene oxide (PEO), poly(methyl methacrylate) (PMMA), LiClO4, and Li1.3Al0.3Ti1.7(PO4)3 (LATP) ceramic particles. The synthesized nanocomposite electrolyte consisted of LATP particles and an amorphous polymer. LATP particles were homogeneously distributed in the polymer matrix. The nanocomposite electrolytes were flexible and self-standing. The lithium-ion conductivity of the nanocomposite electrolyte was almost an order of magnitude higher than that of the PEO/PMMA solid polymer electrolyte.

Estilos ABNT, Harvard, Vancouver, APA, etc.

6

Thompson, Andre L., Lydia M. Mensah e Brian J. Love. "The effect of cisplatin on the nanoscale structure of aqueous PEO–PPO–PEO micelles of varying hydrophilicity observed using SAXS". Soft Matter 15, n.º 19 (2019): 3970–77. http://dx.doi.org/10.1039/c9sm00071b.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

7

Jiang, You Qing, Yun Bo Zhang, Zhi Yong Lin, Jun Chen e Ming Ming Yu. "A Study of Structure Parameters of Block Copolymers Polystyrene-Polyethylene Oxides". Advanced Materials Research 383-390 (novembro de 2011): 2714–18. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.2714.

Texto completo da fonte

Resumo:

Block copolymer consists of two and more than two of different polymer links. Epoxy terminated polydtyrene (Ps-ep) active polymer was used to polymerize polystyrene (Pst)-polyethylene oxide (Peo) block copolymer P (st-b-eo). There were the mixtures of (Ps-ep), (Pst), (Peo) and P (st-b-eo) in the polymerization. It is necessary to separate (Ps-ep), (Pst), (Peo) and P (st-b-eo) in the mixtures in order to determine structure parameters of P (st-b-eo) block copolymers. We can know for certain their types of ABA, BAB and AB of polystyrene (A)-Polyethylene oxides (B) block copolymers with analysis of gel permeation chromatography (GPC).

Estilos ABNT, Harvard, Vancouver, APA, etc.

8

Gao, Renjin, Jiafang Li, Jianrong Xia, Qi Lin e Liwei Wang. "Influence of polyethylene oxide (PEO) on the performance of Chinese lacquer films". BioResources 17, n.º 4 (10 de agosto de 2022): 5622–31. http://dx.doi.org/10.15376/biores.17.4.5622-5631.

Texto completo da fonte

Resumo:

The Chinese lacquer composite films were prepared by modifying raw lacquer with polyethylene oxide. The film was characterized via Fourier-transform infrared spectroscopy, thermogravimetric analysis, and scanning electron microscopy. The infrared spectra confirmed the interaction between the polyethylene oxide and urushiol. The heat-resistance of the film was found to have decreased due to the presence of polyethylene oxide via thermogravimetric analysis. Additional pores and wrinkles were observed in the scanning electron microscopy image of polyethylene oxide modified lacquer films. The mechanical properties were tested according to the national standard. The results indicated that the gloss and flexibility of the modified film was enhanced by the presence of polyethylene oxide. When the ratio of polyethylene oxide was 3%, the gloss was increased from 59.8 to 81.6 and the flexibility changed from 15 mm to 1 mm. The alkaline-resistance, hardness, and adhesion were also increased via the modification of polyethylene oxide.

Estilos ABNT, Harvard, Vancouver, APA, etc.

9

N, Azril, Gareche M, Saoudi L e Zeraibi N. "Effect of Polyethylene Oxide on the Rheological Behavior of Bentonite Suspensions". Journal of Biomedical Research & Environmental Sciences 2, n.º 5 (maio de 2021): 352–57. http://dx.doi.org/10.37871/jbres1242.

Texto completo da fonte

Resumo:

The effect of Polyethylene Oxide (PEO) with a molecular weight 10000g/mol on the rheological behavior of bentonite suspension was examined in terms of viscosity, yield stress and viscoelastic modulus (G’ and G’’); characteristic of complex behaviour of montmorillonite in water. A Physica MCR301 rheometer has been used to measure the rheological properties of samples (6% bentonite) as well as bentonite-PEO mixtures at different concentrations of PEO (0.18%, 0.25%, 0.5% and 1%). The polyethylene oxide adsorbs onto clay particles, which changes their basic characteristics depending on the amount of PEO adsorbed.

Estilos ABNT, Harvard, Vancouver, APA, etc.

10

Lim, HakBeom, e Jae-Kwang Kim. "Li_1.3Al_0.3Ti_1.7(PO₄)₃ /PEO Polymer Double-Layer Electrolyte to Improve Electrochemical Properties of Li-CO₂ Battery". ECS Meeting Abstracts MA2023-02, n.º 4 (22 de dezembro de 2023): 757. http://dx.doi.org/10.1149/ma2023-024757mtgabs.

Texto completo da fonte

Resumo:

Li−CO2 batteries are explored as promising power systems to alleviate environmental issues and to implement space applications. However, sluggish cathode kinetics of CO2 reduction/evolution result in low round-trip efficiency and poor cycling stability of the fabricated energy-storage devices. Herein, we design a double-layer solid electrolyte to decrease interfacial resistance. Li-CO2 battery with high stability and energy density was developed using Li1.3Al0.3Ti1.7(PO4)3 (LATP) as the solid-state electrolyte and a polyethylene oxide (PEO) polymer electrolyte film together. The oxide solid electrolyte LATP has temperature stability and physical solidity, but it has a metal substitution reaction with lithium metal and a low interfacial stability with the electrode. However, this drawback can be solved by using the polymer electrolyte PEO to avoid direct contact between the lithium metal electrode and LATP. The mechanism of the Li-CO2 battery, a carbon capture technology, is used, and the characteristics of the oxide solid electrolyte and polymer electrolyte are combined to suggest a new solution for improving the stability and performance of the battery.

Estilos ABNT, Harvard, Vancouver, APA, etc.

11

Grkovic, M., D. B. Stojanovic, A. Kojovic, S. Strnad, T. Kreze, R. Aleksic e P. S. Uskokovic. "Keratin–polyethylene oxide bio-nanocomposites reinforced with ultrasonically functionalized graphene". RSC Advances 5, n.º 111 (2015): 91280–87. http://dx.doi.org/10.1039/c5ra12402f.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

12

Liu, Huan, e Baoqi Zuo. "Sound absorption property of PVA/PEO/GO nanofiber membrane and non-woven composite material". Journal of Industrial Textiles 50, n.º 4 (6 de março de 2019): 512–25. http://dx.doi.org/10.1177/1528083719832857.

Texto completo da fonte

Resumo:

Blend films based on polyvinyl alcohol/polyethylene oxide (70/30 wt%) undoped and doped with different concentration of graphene oxide were prepared by spiral vane electrospinning. Characteristic properties of the blend films were investigated by using X-ray diffraction and scanning electron microscopy. The sound absorption performance of the compositions (nanofiber membranes and needle punched non-woven fabric) was tested by an impedance tube. The sound absorption performance of non-woven fabric has greatly improved after combining with thin nanofiber membranes. With addition of graphene oxide, the fibers were intertwined in a loop and form a network, the areal density and surface roughness of the nanofiber membrane are reduced. Composites containing polyvinyl alcohol/polyethylene oxide nanofiber membranes and composites containing polyvinyl alcohol/polyethylene oxide/graphene oxide nanofiber membranes exhibited different sound absorption properties in different frequency bands. When the fiber coefficient of variation was small, the average sound absorption coefficient of the composite material was high. However, composites containing both polyvinyl alcohol/polyethylene oxide and polyvinyl alcohol/polyethylene oxide/graphene oxide nanofiber membranes had similar sound absorption properties, and the average sound absorption coefficient was greater than that of polyvinyl alcohol/polyethylene oxide composites.

Estilos ABNT, Harvard, Vancouver, APA, etc.

13

La Monaca, Andrea, Gabriel Girard, Sylvio Savoie, Giovanni Bertoni, Sergey Krachkovskiy, Ashok Vijh, Filippo Pierini, Federico Rosei e Andrea Paolella. "Synthesis of Electrospun NASICON Li_1.5Al_0.5Ge_1.5(PO₄)₃ Solid Electrolyte Nanofibers by Control of Germanium Hydrolysis". Journal of The Electrochemical Society 168, n.º 11 (1 de novembro de 2021): 110512. http://dx.doi.org/10.1149/1945-7111/ac334a.

Texto completo da fonte

Resumo:

We report the synthesis of ceramic Li1.5Al0.5Ge1.5(PO4)3 (LAGP) nanofibers by combining sol–gel and electrospinning techniques. A homogeneous and stable precursor solution based on chlorides was achieved by controlling Ge hydrolysis. Subsequent electrospinning and heat treatment resulted in highly porous nanostructured NASICON pellets. After a full chemical-physical characterization, various amounts of LAGP nanofibers were used as a filler to develop polyethylene oxide (PEO)-based composite electrolytes. The addition of 10% LAGP nanofibers has allowed doubling the ionic conductivity of the plain polymer electrolyte, by providing longer ion-conductive paths and reducing PEO crystallinity. These findings are promising towards developing solution-based synthesis approaches featuring Ge precursors. In addition, the achieved LAGP nanofibers proved to be a promising nanofiller candidate to develop composite electrolytes for next-generation solid-state batteries.

Estilos ABNT, Harvard, Vancouver, APA, etc.

14

Miqdad, Husam, e Ibrahim Abdel-Rahman. "THE ACTIVATION ENERGY OF PURE POLYETHYLENE OXIDE AND POLYETHYLENE OXIDE DISPERSED WITH IODINE". Journal of Southwest Jiaotong University 57, n.º 6 (30 de dezembro de 2022): 614–19. http://dx.doi.org/10.35741/issn.0258-2724.57.6.57.

Texto completo da fonte

Resumo:

The activation energy of thin films polymers made of pure polyethylene oxide (PEO) andPEOdoped with 0.1 % by weight iodine were investigated. The observed physical constants of the cast thin films, such as the activation energy were determined. The films were prepared by the casting method using electricity. This study investigated the variation of the activation energy of thin films of pure (PEO) andPEOdoped with 0.1 % wt. iodine with a frequency in the range of 200-800 kHz and with the temperature in the range of 30-55°C. The results proved that there is a significant change in the values of the activation energy (Ea) of both thin films being studied with the variation of frequency and temperature. It was found that the values of the (Ea) of the prepared thin films decrease withPEOdoped with 0.1 % wt. iodine. The Ea values for both thin films studied decrease with the increase in frequency and temperature.

Estilos ABNT, Harvard, Vancouver, APA, etc.

15

Ma, Su-Min, Li Zhao, Yong-Lei Wang, You-Liang Zhu e Zhong-Yuan Lu. "The coarse-grained models of poly(ethylene oxide) and poly(propylene oxide) homopolymers and poloxamers in big multipole water (BMW) and MARTINI frameworks". Physical Chemistry Chemical Physics 22, n.º 28 (2020): 15976–85. http://dx.doi.org/10.1039/d0cp01006e.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

16

Su, Yuanjie, Guangzhong Xie, Jun Chen, Hongfei Du, Hulin Zhang, Zhen Yuan, Zongbiao Ye, Xiaosong Du, Huiling Tai e Yadong Jiang. "Reduced graphene oxide–polyethylene oxide hybrid films for toluene sensing at room temperature". RSC Advances 6, n.º 100 (2016): 97840–47. http://dx.doi.org/10.1039/c6ra21077e.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

17

Denney, Jacob, e Hong Huang. "Thermal Decomposition Characteristics of PEO/LiBF4/LAGP Composite Electrolytes". Journal of Composites Science 6, n.º 4 (14 de abril de 2022): 117. http://dx.doi.org/10.3390/jcs6040117.

Texto completo da fonte

Resumo:

Lithium-based batteries with improved safety performance are highly desired. At present, most safety hazard is the consequence of the ignition and flammability of organic liquid electrolytes. Dry ceramic-polymer composite electrolytes are attractive for their merits of non-flammability, reduced gas release, and thermal stability, in addition to their mechanical strength and flexibility. We recently fabricated free-standing solid composite electrolytes made up of polyethylene oxide (PEO), LiBF4 salt, and Li1+xAlxGe2−x(PO4)3 (LAGP). This study is focused on analyzing the impacts of LAGP on the thermal decomposition characteristics in the series of PEO/LiBF4/LAGP composite membranes. It is found that the appropriate amount of LAGP can (1) significantly reduce the organic solvent trapped in the polymer network and (2) increase the peak temperature corresponding to the thermal degradation of the PEO/LiBF4 complex. In the presence of LAGP, although the peak temperature related to the degradation of free PEO is reduced, the portion of free PEO, as well as its decomposition rate, is effectively reduced, resulting in slower gas release.

Estilos ABNT, Harvard, Vancouver, APA, etc.

18

Peta, Gayathri, Shaul Bublil, Hadas Alon-Yehezkel, Ortal Breuer, Yuval Elias, Nethanel Shpigel, Miryam Fayena-Greenstein, Diana Golodnitsky e Doron Aurbach. "Toward High Performance All Solid-State Na Batteries: Investigation of Electrolytes Comprising NaPF₆, Poly(ethylene oxide) and TiO₂". Journal of The Electrochemical Society 168, n.º 11 (1 de novembro de 2021): 110553. http://dx.doi.org/10.1149/1945-7111/ac330d.

Texto completo da fonte

Resumo:

Solid electrolytes based on polyethylene oxide (PEO) have been studied for decades, owing to their facile and low-cost processing, good electrochemical stability, and excellent complexation with alkali metal salts. Complexes of PEO with appropriate sodium salts are well known for ionic conduction. Here, pristine NaPF6:P(EO)16 and a composite solid electrolyte containing TiO2 nanowires were investigated as candidates for rechargeable solid-state sodium batteries. Comprehensive electrochemical characterizations were carried out, including ionic conductivity, transference number, and structural stability. At elevated temperatures, the specific capacity of an all-solid-state Na3Ti2(PO4)3 (Na/NTP) sodium battery was 110 mAh g−1, higher than room-temperature cells with liquid electrolyte solutions. We attribute this behavior to increased conductivity of the polymer electrolyte, induced by the ceramic nanofiller, combined with enhanced electronic conductivity of the NTP cathode.

Estilos ABNT, Harvard, Vancouver, APA, etc.

19

Hu, Feihu, Ting Chen e Wei Wang. "Effects of polyethylene oxide and poly(3-hydroxybutyrate-co-3-hydroxyvalerate) nanofibrous substrate on omental adipose-derived mesenchymal stem cell neuronal differentiation and peripheral nerve regeneration". RSC Advances 7, n.º 68 (2017): 42833–44. http://dx.doi.org/10.1039/c7ra08008e.

Texto completo da fonte

Resumo:

Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (PHBV) and polyethylene oxide (PEO) display biodegradable and biocompatible properties for applications in the biomedical fields. PEO incorporated with PHBV fabricates superior electrospun nanofibres.

Estilos ABNT, Harvard, Vancouver, APA, etc.

20

Kammoun, M., S. Berg e H. Ardebili. "Flexible thin-film battery based on graphene-oxide embedded in solid polymer electrolyte". Nanoscale 7, n.º 41 (2015): 17516–22. http://dx.doi.org/10.1039/c5nr04339e.

Texto completo da fonte

Resumo:

A novel flexible thin-film lithium ion battery containing polyethylene oxide (PEO) with 1% graphene oxide (GO) nanosheets is fabricated that offers enhanced safety, flexibility, stability and high capacity.

Estilos ABNT, Harvard, Vancouver, APA, etc.

21

Varnaitė-Žuravliova, Sandra, Natalja Savest, Julija Baltušnikaitė-Guzaitienė, Aušra Abraitienė e Andres Krumme. "Electrospinning of Chitosan Biopolymer and Polyethylene Oxide Blends". Autex Research Journal 20, n.º 4 (19 de novembro de 2020): 426–40. http://dx.doi.org/10.2478/aut-2019-0031.

Texto completo da fonte

Resumo:

AbstractThe objective of this study is to investigate the morphological (scanning electron microscopicy images), thermal (differential scanning calorimetry), and electrical (conductivity) properties and to carry out compositional analysis (Fourier-transform infrared) of produced nonwoven fibrous materials adapted in biomedical applications as scaffolds. The orientation of produced nanofilaments was also investigated because it is considered as one of the essential features of a perfect tissue scaffold. Viscosity and electrical conductivity of solutions, used in the manufacturing process, were also disassembled because these properties highly influence the morphological properties of produced nanofibers. The nanofibrous scaffolds were fabricated via conventional electrospinning technique from biopolymer, synthetic polymer, and their blends. The chitosan (CS) was chosen as biopolymer and polyethylene oxide (PEO) of low molecular weight as synthetic polymer. Solutions from pure CS were unspinnable: beads instead of nanofibers were formed via spinning. The fabrication of pure PEO nanomats from solutions of 10 wt%, 15 wt%, and 20 wt% concentrations (in distilled water) turned out to be successful. The blending of composed CS solutions with PEO ones in ratios of 1:1 optimized the parameters of electrospinning process and provided the opportunity to fabricate CS/PEO blends nanofibers. The concentration of acetic acid (AA) used to dissolve CS finely spuninned the nanofibers from blended solutions and influenced the rate of crystallization of manufactured fiber mats. The concentration of PEO in solutions as well as viscosity of solutions also influenced the diameter and orientation of formed nanofibers. The beadless, highly oriented, and defect-free nanofibers from CS/PEO solutions with the highest concentration of PEO were successfully electrospinned. By varying the concentrations of AA and low molecular weight PEO, it is possible to fabricate beadless and highly oriented nanofiber scaffolds, which freely can found a place in medical applications.

Estilos ABNT, Harvard, Vancouver, APA, etc.

22

Zheng, Peng, Lin Hua Zhu, Tian Si e Yan Lin Sun. "Comparision of the Preparation Methods of Mesoporous Phosphate Compounds Belonging to NZP Family". Advanced Materials Research 631-632 (janeiro de 2013): 116–20. http://dx.doi.org/10.4028/www.scientific.net/amr.631-632.116.

Texto completo da fonte

Resumo:

Using polyethylene oxide (PEO) as template, the new types of mesoporous phosphate compound which belongs to NaZr2(PO4)3(NZP) family were synthesized by copreciptate, sol-gel and mechanochemical activation(MA) route respectively. The physical phase and pore structure of the synthesized powder materials were characterized by X-ray diffraction (XRD) and N2 adsorption–desorption. The results showed that the crystalline NZP family compound with mesoporous structure is formed by sol-gel route followed with calcination as well as MA method followed with hydrothermal treatment when the mole ratio of PEO to Zr is 1:10, and the specific surface area, average pore diameter and pore volume of the synthesized powder is 20-50m2/g, 3-6.nm and 0.05-0.12cm3/g respectively. The above research results indicate that it is promising to expand the application field of the powder of NZP family from low thermal expansion ceramics to catalytic materials.

Estilos ABNT, Harvard, Vancouver, APA, etc.

23

Beaupain, Jean Philippe, Katja Waetzig, Henry Auer, Nicolas Zapp, Kristian Nikolowski, Mareike Partsch, Mihails Kusnezoff e Alexander Michaelis. "Co-Sintering of Li1.3Al0.3Ti1.7(PO4)3 and LiFePO4 in Tape-Casted Composite Cathodes for Oxide Solid-State Batteries". Batteries 9, n.º 11 (2 de novembro de 2023): 543. http://dx.doi.org/10.3390/batteries9110543.

Texto completo da fonte

Resumo:

Solid-state batteries (SSBs) with Li-ion conductive electrolytes made from polymers, thiophosphates (sulfides) or oxides instead of liquid electrolytes have different challenges in material development and manufacturing. For oxide-based SSBs, the co-sintering of a composite cathode is one of the main challenges. High process temperatures cause undesired decomposition reactions of the active material and the solid electrolyte. The formed phases inhibit the high energy and power density of ceramic SSBs. Therefore, the selection of suitable material combinations as well as the reduction of the sintering temperatures are crucial milestones in the development of ceramic SSBs. In this work, the co-sintering behavior of Li1.3Al0.3Ti1.7(PO4)3 (LATP) as a solid electrolyte with Li-ion conductivity of ≥0.38 mS/cm and LiFePO4 with a C-coating (LFP) as a Li-ion storage material (active material) is investigated. The shrinkage behavior, crystallographic analysis and microstructural changes during co-sintering at temperatures between 650 and 850 °C are characterized in a simplified model system by mixing, pressing and sintering the LATP and LFP and compared with tape-casted composite cathodes (d = 55 µm). The tape-casted and sintered composite cathodes were infiltrated by liquid electrolyte as well as polyethylene oxide (PEO) electrolyte and electrochemically characterized as half cells against a Li metal anode. The results indicate the formation of reaction layers between LATP and LFP during co-sintering. At Ts > 750 °C, the rhombohedral LATP phase is transformed into an orthorhombic Li1.3+xAl0.3−yFex+yTi1.7−x(PO4)3 (LAFTP) phase. During co-sintering, Fe3+ diffuses into the LATP phase and partially occupies the Al3+ and Ti4+ sites of the NASICON structure. The formation of this LAFTP leads to significant changes in the electrochemical properties of the infiltrated composite tapes. Nevertheless, a high specific capacity of 134 mAh g−1 is measured by infiltrating the sintered composite tapes with liquid electrolytes. Additionally, infiltration with a PEO electrolyte leads to a capacity of 125 mAh g−1. Therefore, the material combination of LATP and LFP is a promising approach to realize sintered ceramic SSBs.

Estilos ABNT, Harvard, Vancouver, APA, etc.

24

Wang, Bi-Heng, Tian Xia, Qun Chen e Ye-Feng Yao. "Probing the Dynamics of Li+ Ions on the Crystal Surface: A Solid-State NMR Study". Polymers 12, n.º 2 (9 de fevereiro de 2020): 391. http://dx.doi.org/10.3390/polym12020391.

Texto completo da fonte

Resumo:

Polyethylene oxide-based solid polymer electrolytes (SPEs) are of research interest because of their potential applications in all-solid-state Li+ batteries. However, despite their advantages in terms of compatibility with the electrodes and easy processing, polyethylene oxide (PEO)/Li+ complexes often suffer from low conductivity at room temperature. Understanding the conduction mechanism and, in turn, developing strategies to improve the conductivity have long been the main objectives underlying research into PEO/Li+ complex electrolytes. Here, we prepared several special PEO/Li+ complex samples where the PEO/Li+ complex structures were located on the surfaces of PEO crystals and consisted of high content chain ends. We found two different Li+ species in the PEO/Li+ complex structures via solid-state nuclear magnetic resonance (NMR). The 2D 7Li exchange NMR showed the exchange process between the different Li+ species. The exchange dynamics of the Li+ ions provide a molecular mechanism of the Li+ transportation in the surface of PEO crystal lamella, which is further correlated with the ionic conduction mechanism of the PEO/Li+ complex structure.

Estilos ABNT, Harvard, Vancouver, APA, etc.

25

Matveev, N. N. "CONFORMATIONAL APPROACH TO DETERMINING THE POLARIZATION OF POLYETHYLENE OXIDE DURING MELT-CRYSTAL TRANSITIONS IN A NON-UNIFORM TEMPERATURE FIELD". Eurasian Physical Technical Journal 19, n.º 3 (41) (22 de setembro de 2022): 29–33. http://dx.doi.org/10.31489/2022no3/29-33.

Texto completo da fonte

Resumo:

In connection with the widespread use of polyethylene oxide (PEO) in modern technologies, studies of the relationship between its supramolecular structure and properties by modeling methods have recently intensified. Usually, when modeling the thermopolarized effect, the supramolecular structure of flexible-chain polymers is represented by a set of linear one-dimensional crystals. This approach does not take into account the conformational features of the structure of polymers. Using the example of (PEO), the article substantiates a method for calculating the influence of the conformations of a polymer molecule on the temperature dependence of the averaged square of the dipole moment of its molecules. The problem solved in this work, as well as the proposed solutions and approaches, reflect the general fundamental problem of the thermodynamic stability of multicomponent systems in external fields.

Estilos ABNT, Harvard, Vancouver, APA, etc.

26

Cho, Seonggyu, Shinho Kim, Wonho Kim, Seok Kim e Sungsook Ahn. "All-Solid-State Lithium Battery Working without an Additional Separator in a Polymeric Electrolyte". Polymers 10, n.º 12 (9 de dezembro de 2018): 1364. http://dx.doi.org/10.3390/polym10121364.

Texto completo da fonte

Resumo:

Considering the safety issues of Li ion batteries, an all-solid-state polymer electrolyte has been one of the promising solutions. Achieving a Li ion conductivity of a solid-state electrolyte comparable to that of a liquid electrolyte (>1 mS/cm) is particularly challenging. Even with characteristic ion conductivity, employment of a polyethylene oxide (PEO) solid electrolyte has not been sufficient due to high crystallinity. In this study, hybrid solid electrolyte (HSE) systems have been designed with Li1.3Al0.3Ti0.7(PO4)3 (LATP), PEO and lithium bis(trifluoromethanesulfonyl)imide (LiTFSI). A hybrid solid cathode (HSC) is also designed using LATP, PEO and lithium cobalt oxide (LiCoO2, LCO)—lithium manganese oxide (LiMn2O4, LMO). The designed HSE system has 2.0 × 10−4 S/cm (23 °C) and 1.6 × 10−3 S/cm (55 °C) with a 6.0 V electrochemical stability without an additional separator membrane introduction. In these systems, succinonitrile (SN) has been incorporated as a plasticizer to reduce crystallinity of PEO for practical all-solid Li battery system development. The designed HSC/HSE/Li metal cell in this study operates without any leakage and short-circuits even under the broken cell condition. The designed HSC/HSE/Li metal cell in this study displays an initial charge capacity of 82/62 mAh/g (23 °C) and 123.4/102.7 mAh/g (55 °C). The developed system overcomes typical disadvantages of internal resistance induced by Ti ion reduction. This study contributes to a new technology development of all-solid-state Li battery for commercial product design.

Estilos ABNT, Harvard, Vancouver, APA, etc.

27

Lee, Jeremy, Michael Rottmayer e Hong Huang. "Impacts of Lithium Salts on the Thermal and Mechanical Characteristics in the Lithiated PEO/LAGP Composite Electrolytes". Journal of Composites Science 6, n.º 1 (30 de dezembro de 2021): 12. http://dx.doi.org/10.3390/jcs6010012.

Texto completo da fonte

Resumo:

Lithium batteries utilizing solid-state electrolytes have the potential to alleviate their safety hazard, reduce packaging volume, and enable flexible design. Polymer/ceramic composite electrolytes (CPE) are more attractive because the combination is capable of remedying and/or transcending individual constituent’ properties. Recently, we fabricated a series of free-standing composite electrolyte membranes consisting of Li1.4Al0.4Ge1.6(PO4)3 (LAGP), polyethylene oxide (PEO), and lithium salts. In this study, we characterized thermal and mechanical properties of the CPEs with two representative lithium salts, i.e., lithium boron fluoride (LiBF4) and lithium bis(trifluoromethanesulfonyl)imide (LiTFSI). We found that the type of lithium salt can prevail the LAGP ceramic loadings on altering the key properties. It is observed that LiTFSI, compared with LiBF4, causes more significant reduction in terms of the crystallinity of PEO, melting transition, and mechanical strengths. The differences in these aspects can be ascribed to the interactions between the polymer matrix and anions in lithium salt.

Estilos ABNT, Harvard, Vancouver, APA, etc.

28

Zhu, Kai, Yexiang Liu e Jin Liu. "A fast charging/discharging all-solid-state lithium ion battery based on PEO-MIL-53(Al)-LiTFSI thin film electrolyte". RSC Adv. 4, n.º 80 (2014): 42278–84. http://dx.doi.org/10.1039/c4ra06208f.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

29

Javaid, Anum, Mohammed Jalalah, Rimsha Safdar, Zubair Khaliq, Muhammad Bilal Qadir, Sumra Zulfiqar, Adnan Ahmad et al. "Ginger Loaded Polyethylene Oxide Electrospun Nanomembrane: Rheological and Antimicrobial Attributes". Membranes 12, n.º 11 (16 de novembro de 2022): 1148. http://dx.doi.org/10.3390/membranes12111148.

Texto completo da fonte

Resumo:

Synthetic antibiotics have captured the market in recent years, but the side effects of these products are life-threatening. In recent times, researchers have focused their research on natural-based products such as natural herbal oils, which are eco-friendly, biocompatible, biodegradable, and antibacterial. In this study, polyethylene oxide (PEO) and aqueous ginger extract (GE) were electrospun to produce novel antibacterial nanomembrane sheets as a function of PEO and GE concentrations. A GE average particle size of 91.16 nm was achieved with an extensive filtration process, inferring their incorporation in the PEO nanofibres. The presence of the GE was confirmed by Fourier transform infrared spectroscopy (FTIR) through peaks of phenol and aromatic groups. The viscoelastic properties of PEO/GE solutions were analysed in terms of PEO and GE concentrations. Increasing PEO and GE concentrations increased the solution’s viscosity. The dynamic viscosity of 3% was not changed with increasing shear rate, indicating Newtonian fluid behaviour. The dynamic viscosity of 4 and 5 wt% PEO/GE solutions containing 10% GE increased exponentially compared to 3 wt%. In addition, the shear thinning behaviour was observed over a frequency range of 0.05 to 100 rad/s. Scanning Electron Microscopy (SEM) analysis also specified an increase in the nanofibre’s diameter with increasing PEO concentration, while SEM images displayed smooth morphology with beadless nanofibres at different PEO/GE concentrations. In addition, PEO/GE nanomembranes inhibited the growth of Staphylococcus aureus, as presented by qualitative antibacterial results. The extent of PEO/GE nanomembrane’s antibacterial activity was further investigated by the agar dilution method, which inhibited the 98.79% Staphylococcus aureus population at 30% GE concentration.

Estilos ABNT, Harvard, Vancouver, APA, etc.

30

Martínez-Tong, Daniel E., Luis A. Miccio e Angel Alegria. "Ionic transport in the amorphous phase of semicrystalline polyethylene oxide thin films". Soft Matter 13, n.º 33 (2017): 5597–603. http://dx.doi.org/10.1039/c7sm00651a.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

31

Zhang, L. X., Y. Z. Li, L. W. Shi, R. J. Yao, S. S. Xia, Y. Wang e Y. P. Yang. "Electrospun Polyethylene Oxide (PEO)-Based Composite polymeric nanofiber electrolyte for Li-Metal Battery". Journal of Physics: Conference Series 2353, n.º 1 (1 de outubro de 2022): 012004. http://dx.doi.org/10.1088/1742-6596/2353/1/012004.

Texto completo da fonte

Resumo:

Abstract Composite polymer electrolytes (CPEs) based on polyethylene oxide (PEO) offer manufacturing feasibility and outstanding mechanical flexibility. However, the low ionic conductivity of the CPEs at room temperature, as well as the poor mechanical properties, have hindered their commercialization. In this work, Solid-state electrolytes based on polyethylene oxide (PEO) with and without fumed SiO2 (FS) nanoparticles are prepared by electrostatic spinning process. The as-spun PEO hybrid nanofiber electrolyte with 6.85 wt% FS has a relatively high lithium ion conductivity and electrochemical stability, which is 4.8 × 10-4 S/cm and up to 5.2 V vs. Li+/Li, respectively. Furthermore, it also shows a higher tensile strength (2.03 MPa) with % elongation at break (561.8). Due to the superior electrochemical and mechanical properties, it is promising as high-safety and all-solid-state polymer electrolyte for advanced Li-metal battery.

Estilos ABNT, Harvard, Vancouver, APA, etc.

32

Fakhruddin, Sarmad K., Hayder A. Abdulbari, Ahmad Z. Sulaiman e Hind A. Rafeeq. "Investigating the improvement of Degradation Resistant with the Addition of SDBS Anionic Surfactant to PEO polymer". MATEC Web of Conferences 225 (2018): 06019. http://dx.doi.org/10.1051/matecconf/201822506019.

Texto completo da fonte

Resumo:

Polyethylene Oxide (PEO) is one of the most common drag reduction agents. However, its ability to reduce drag in turbulent flow decreases with the time due to the degradation of its molecules. Thus, the enhancement of its degradation resistance by the addition of Anionic surfactant is presented. The Polyethylene oxide (PEO) was used in different concentration ranges from 10 to 60 ppm and with addition of sodium dodecyl benzene sulfonate (SDBS) as the anionic surfactant with five concentrations between 100 to 500 ppm. The degradation measurements were done using rotating disk apparatus (RDA). The RDA results have shown a considerable improvement in the degradation resistance of PEO with the addition of surfactant to the polymer solution. The interaction between the polymer and the surfactant results in transferring the polymer chain from coil to straight-like body. Thus, enhance the polymer degradation resistant ability.

Estilos ABNT, Harvard, Vancouver, APA, etc.

33

Luo, Fubin, Pinping Yan, Qingrong Qian, Hongzhou Li, Baoquan Huang e Qinghua Chen. "Preparation of Layered Polyethylene Oxide/rGOComposite: Flexible Lateral Heat Spreaders". Polymers 11, n.º 3 (21 de março de 2019): 532. http://dx.doi.org/10.3390/polym11030532.

Texto completo da fonte

Resumo:

In this paper, high thermal conductive polyethylene oxide (PEO)/reduced graphene oxide (rGO) composite is prepared via large-scale green reduction. Flexible layered PEO/GO composites are pre-prepared in aqueous solution. It is demonstrated that PEO chains can form hydrogen bonds with GO. Being driven by hydrogen bonds, GO/PEO composites show homogeneous and lateral highly oriented structures, resulting in excellent mechanical properties. The pre-prepared composite films are large scale soaked into ascorbic acid solution. GO nanosheets in the matrix of the composites can be reduced by ascorbic acid. The results indicate that PEO chains can repair the damage of the films caused by the reduction process. Therefore, the films can maintain their original configuration and still keep excellent flexibility. By comparison, pristine GO films are totally destroyed when the same reduction is experienced. Due to the presence of PEO, the lateral highly oriented structure of the composite will not be damaged. After reduction, the thermal conductivity of the composite reaches to 12.03 W m−1 K−1 along the rGO nanosheet oriented direction.

Estilos ABNT, Harvard, Vancouver, APA, etc.

34

Sajid, Memoon, Hyun Bum Kim, Jong Hwan Lim e Kyung Hyun Choi. "Liquid-assisted exfoliation of 2D hBN flakes and their dispersion in PEO to fabricate highly specific and stable linear humidity sensors". Journal of Materials Chemistry C 6, n.º 6 (2018): 1421–32. http://dx.doi.org/10.1039/c7tc04933a.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

35

Zhang, Lishuo, Wenqiang Chai, Jiaru Zhang, Zhouli Chen, Ziyang Yue, Jiayao Wang e Jiankang Yu. "Switchable surface and loading/release of target molecules in hierarchically porous PLA nonwovens based on shape memory effect". RSC Advances 14, n.º 9 (2024): 6199–204. http://dx.doi.org/10.1039/d3ra08411f.

Texto completo da fonte

Estilos ABNT, Harvard, Vancouver, APA, etc.

36

Nguyen, Anh Tuan, e Woochul Lee. "Thermal Conductivity Enhancement of Single Polyethylene Oxide Nanofiber". ECS Meeting Abstracts MA2024-02, n.º 35 (22 de novembro de 2024): 2435. https://doi.org/10.1149/ma2024-02352435mtgabs.

Texto completo da fonte

Resumo:

Thermal management is vital in the development of various electronic and optoelectronic devices, including high-power integrated circuits. A temperature rise, often caused by inadequate heat dissipation, can significantly affect these devices, leading to decreased performance and reduced lifespan. Although metals are commonly used for thermal management, there has been a continuous search for materials that are lightweight, cost-effective to produce, and chemically stable. In this context, we have explored the thermal conductivity of polyethylene oxide (PEO) nanofibers, which were fabricated using the near-field electrospinning technique. Our research revealed that the thermal conductivity of PEO nanofibers (~3 W/m·K) is significantly higher than that of their bulk counterparts (0.2 W/m·K). This increase in thermal conductivity is attributed to the improved internal structure of the nanofibers, such as enhanced crystallinity and molecular orientation. Our findings highlight the potential for using polymers like PEO nanofibers in applications that require high thermal conductivity, including electronics packaging, energy storage, and thermal interface materials.

Estilos ABNT, Harvard, Vancouver, APA, etc.

37

Chinh, Nguyen Thuy. "EFFECT OF POLYETHYLENE OXIDE ON PROPERTIES OF CHITOSAN/ALGINATE/LOVASTATINE COMPOSITES". Vietnam Journal of Science and Technology 56, n.º 2A (21 de junho de 2018): 156–62. http://dx.doi.org/10.15625/2525-2518/56/2a/12678.

Texto completo da fonte

Resumo:

In this work, polyethylene oxide (PEO) was used as a compatibilizer to improve compatibility of chitosan (CS) and alginate (AG) in CS/AG composites loading lovastatine (LS). The CS/AG/PEO/LS composites were prepared by solution method with the ratio of AG/CS and LS content fixed at 4/1 and 10 wt.% (in comparison with the total weight of CS and AG), respectively. The PEO content was changed 3, 5 and 10 wt.% as compared with AG+CS+LS weight. Thanks to presence of PEO, the CS/AG/LS composites have more regular structure as well as higher loading capacity and better drug release control. The effect of PEO on structure and morphology of CS/AG/PEO/LS composites was evaluated by Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and differential scanning calorimetric (DSC) methods. The FTIR spectra of CS/AG/PEO/LS composites exhibited the peaks characterized for main groups in AG, CS, PEO and LS. The SEM images showed that LS in a bar shape can disperse more regularly in CS/AG/PEO/LS composites than that in the composite without PEO. The DSC diagrams expressed that the relative crystal degree of CS/AG/PEO/LS composites was smaller than that in CS/AG/LS composite. The influence of PEO content on the in-vitro drug release from the composites in pH 7.4 solution was also investigated.

Estilos ABNT, Harvard, Vancouver, APA, etc.

38

Chen, Xiao Nong, e Robert Pelton. "Pre-Adsorption of Amphiphilic Polymers on Synthetic Surfaces for Biofouling Retardation". Advanced Materials Research 11-12 (fevereiro de 2006): 363–66. http://dx.doi.org/10.4028/www.scientific.net/amr.11-12.363.

Texto completo da fonte

Resumo:

Polystyrene (PS), polyethylene (PE), polypropylene (PP), glass and stainless steel were exposed to aqueous solutions of a series amphiphilic polymers at room temperature, including N-isopropylacrylamide (NIPAM)-based polymers, polyvinylpyrrolidone (PVP), polypropylene oxide (PPO)-polyethylene oxide (PEO) block copolymers and PEO. Dynamic contact angle measurements of the material surfaces before and after the treatment indicate that only NIPAM-based polymers can adsorb on both hydrophobic and hydrophilic surfaces. The surface morphologies of the materials before and after polymer adsorption were investigated by profilometry. Protein adsorption on the surfaces pre-adsorbed NIPAM-based polymers was investigated by dual polarisation interferometry (DPI) and profilometry using lysozyme as the model protein. The results obtained indicate that NIPAM-based polymers can significantly improve the biofouling resistance of synthetic surfaces.

Estilos ABNT, Harvard, Vancouver, APA, etc.

39

Shen, Lingdi, Cheng Cheng, Xufeng Yu, Yin Yang, Xuefen Wang, Meifang Zhu e Benjamin S. Hsiao. "Low pressure UV-cured CS–PEO–PTEGDMA/PAN thin film nanofibrous composite nanofiltration membranes for anionic dye separation". Journal of Materials Chemistry A 4, n.º 40 (2016): 15575–88. http://dx.doi.org/10.1039/c6ta04360g.

Texto completo da fonte

Resumo:

Novel low pressure UV-cured chitosan–polyethylene oxide–polytriethylene glycol dimethacrylate/polyacrylonitrile (CS–PEO–PTEGDMA/PAN) thin film nanofibrous composite nanofiltration membranes for anionic dye separation are demonstrated.

Estilos ABNT, Harvard, Vancouver, APA, etc.

40

Azli, A. A., N. S. A. Manan e M. F. Z. Kadir. "Conductivity and Dielectric Studies of Lithium Trifluoromethanesulfonate Doped Polyethylene Oxide-Graphene Oxide Blend Based Electrolytes". Advances in Materials Science and Engineering 2015 (2015): 1–10. http://dx.doi.org/10.1155/2015/145735.

Texto completo da fonte

Resumo:

Series of polymer blend consisting of polyethylene oxide (PEO) and graphene oxide (GO) as co-host polymer were prepared using solution cast method. The most amorphous PEO-GO blend was obtained using 90 wt.% of PEO and 10 wt.% of GO as recorded by X-ray diffraction (XRD). Fourier transform infrared spectroscopy (FTIR) analysis proved the interaction between PEO, GO, lithium trifluoromethanesulfonate (LiCF3SO3), and ethylene sulfite (ES). Incorporation of 25 wt.% LiCF3SO3into the PEO-GO blend increases the conductivity to3.84±0.83×10-6 S cm−1. The conductivity starts to decrease when more than 25 wt.% salt is doped into the polymer blend. The addition of 1 wt.% ES into the polymer electrolyte has increased the conductivity to1.73±0.05×10-5 S cm−1. Dielectric studies show that all the electrolytes obey non-Debye behavior.

Estilos ABNT, Harvard, Vancouver, APA, etc.

41

Nathanson, A. S., A. R. Ploszajski, M. Billing, J. P. Cook, D. W. K. Jenkins, T. F. Headen, Z. Kurban, A. Lovell e S. M. Bennington. "Ammonia borane–polyethylene oxide composite materials for solid hydrogen storage". Journal of Materials Chemistry A 3, n.º 7 (2015): 3683–91. http://dx.doi.org/10.1039/c4ta06657j.

Texto completo da fonte

Resumo:

Co-electrospinning ammonia borane (AB) and polyethylene oxide (PEO) has created a unique crystal phase that promotes faster hydrogen release from AB below its melting temperature with no incubation time.

Estilos ABNT, Harvard, Vancouver, APA, etc.

42

Zhao, Dongxu, Jie Ru, Tong Wang, Yanjie Wang e Longfei Chang. "Performance Enhancement of Ionic Polymer-Metal Composite Actuators with Polyethylene Oxide". Polymers 14, n.º 1 (26 de dezembro de 2021): 80. http://dx.doi.org/10.3390/polym14010080.

Texto completo da fonte

Resumo:

Current ionic polymer-metal composite (IPMC) always proves inadequate in terms of large attenuation and short working time in air due to water leakage. To address this problem, a feasible and effective solution was proposed in this study to enhance IPMC performance operating in air by doping polyethylene oxide (PEO) with superior water retention capacity into Nafion membrane. The investigation of physical characteristics of membranes blended with varying PEO contents revealed that PEO/Nafion membrane with 20 wt% PEO exhibited a homogeneous internal structure and a high water uptake ratio. At the same time, influences of PEO contents on electromechanical properties of IPMCs were studied, showing that the IPMCs with 20 wt% PEO presented the largest peak-to-peak displacement, the highest volumetric work density, and prolonged stable working time. It was demonstrated that doping PEO reinforced electromechanical performances and restrained displacement attenuation of the resultant IPMC.

Estilos ABNT, Harvard, Vancouver, APA, etc.

43

Vinegrad, Adi, Heftsi Ragones, Nishani Jayakody, Gilat Ardel, Meital Goor, Yossi Kamir, Moty Marcos Dorfman et al. "Plasticized 3D-Printed Polymer Electrolytes for Lithium-Ion Batteries". Journal of The Electrochemical Society 168, n.º 11 (1 de novembro de 2021): 110549. http://dx.doi.org/10.1149/1945-7111/ac39d5.

Texto completo da fonte

Resumo:

In the current research, we developed and printed by fused-filament fabrication polylactide-polyethylene-oxide blended membranes. The influence of relative content of polymers on the ease of extrusion and printing processes was studied. Ionic liquid N-butyl-N-methylpyrrolidinium bis(trifluoromethane-sulfonyl)imide (Pyr14TFSI) with dissolved LiTFSI salt was infused into the membranes to produce free-standing films of quasi-solid polymer electrolytes. The printed membranes were characterized by ESEM, DSC, XPS, NMR and EIS methods. Neat-printed PLA (polylactide) membrane exhibited poor wetting and low uptake of ionic liquid. However, the XPS tests of 3D-printed PLA-PEO membrane infused with LiTFSI solvated ionic liquid show evidence of the interaction between lithium cations with both, PEO (polyethylene oxide) and PLA. The measurements of diffusion coefficients by PGSE-NMR suggest that the Li+ ions are coordinated by the PEO segments in the polymer blend. Increase of the PEO content at the expense of PLA polymer, leads to more than one order of magnitude improvement of bulk conductivity, approaching 0.2 mS cm−1 at 60 ° C .

Estilos ABNT, Harvard, Vancouver, APA, etc.

44

Habiburrohman, Musyafa Riziq, Muhammad Amir Jamilludin, Nilam Cahyati, Nendar Herdianto e Yusril Yusuf. "Fabrication and in vitro cytocompatibility evaluation of porous bone scaffold based on cuttlefish bone-derived nano-carbonated hydroxyapatite reinforced with polyethylene oxide/chitosan fibrous structure". RSC Advances 15, n.º 7 (2025): 5135–50. https://doi.org/10.1039/d4ra08457h.

Texto completo da fonte

Resumo:

In this work, we developed a novel porous bone scaffold based on cuttlefish bone-derived nano-carbonated hydroxyapatite reinforced with polyethylene oxide/chitosan fibrous network (nCHA/PEO/CS), which demonstrated enhanced cytocompatibility.

Estilos ABNT, Harvard, Vancouver, APA, etc.

45

Huang, Hong, Jeremy Lee e Michael Rottmayer. "Thermal, Mechanical, and Electrical Characteristics of the Lithiated PEO/LAGP Composite Electrolytes". ECS Meeting Abstracts MA2022-01, n.º 2 (7 de julho de 2022): 311. http://dx.doi.org/10.1149/ma2022-012311mtgabs.

Texto completo da fonte

Resumo:

Lithium-ion batteries utilizing solid-state electrolytes have potential to alleviate safety issues, prolong discharge/charge cycle life, reduce packaging volume, and enable flexible design. Polymer-ceramic composite electrolytes are more attractive and recognized because the combination can remedy and/or transcend individual constituent’ properties. We have fabricated a series of free-standing composite electrolyte membranes consisting of Li1.4Al0.4Ge1.6(PO4)3 (LAGP), polyethylene oxide (PEO), and two different lithium-salts, i.e. LiBF4 and lithium bis(trifluoromethanesulfonyl)imide (LiTFSI). It is determined that the type of lithium salt can prevail the ceramic LAGP loadings on altering the thermal, mechanical, and electrical properties of the composite electrolytes. In this paper, we will present the results and discuss the differences in the aspects of melting transition, mechanical reinforcement, and ionic conduction resulting from the two different lithium salts together with the content of LAGP ceramic fillers in the lithiated PEO/LAGP composite electrolytes. The changes in these three aspects can be ascribed to the different interactions between the polymer matrix and lithium salt in the composite setting.

Estilos ABNT, Harvard, Vancouver, APA, etc.

46

Djokic, Jelena, Aleksandar Kojovic, Dusica Stojanovic, Aleksandar Marinkovic, Goran Vukovic, Radoslav Aleksic e Petar Uskokovic. "Processing and nanomechanical properties of chitosan/polyethylene oxide blend films". Journal of the Serbian Chemical Society 77, n.º 12 (2012): 1723–33. http://dx.doi.org/10.2298/jsc121121139d.

Texto completo da fonte

Resumo:

Chitosan based films have found an increasing implementation in variety of topics among which as drug delivery carriers, in packaging industry and as water puritication filters. Therefore, in order to achieve mechanical integrity of such films while preserving processability and biocompatibility, chitosan based films are fabricated in forms of blends with polyethylene oxide (PEO). Nanoindentation study is undertaken in order to investigate nanomechanical properties and surface morphology of chitosan films in blends with various content of PEO. Results of differential scanning calorimetry, water uptake and nanoindentation revealed that films with 80/20 blend ratio of chitosan/PEO showed the optimal values of reduced modulus and hardness. It appears that the incorporation of synthetic PEO in chitosan films could lower the manufacturing cost while preserving the mechanical integrity of the films.

Estilos ABNT, Harvard, Vancouver, APA, etc.

47

AUXIER, JULIE A., KARL F. SCHILKE e JOSEPH McGUIRE. "Activity Retention after Nisin Entrapment in a Polyethylene Oxide Brush Layer". Journal of Food Protection 77, n.º 9 (1 de setembro de 2014): 1624–29. http://dx.doi.org/10.4315/0362-028x.jfp-14-042.

Texto completo da fonte

Resumo:

The cationic, amphiphilic peptide nisin is an effective inhibitor of gram-positive bacteria whose mode of action does not encourage pathogenic resistance, and its proper incorporation into food packaging could enhance food stability, safety, and quality in a number of circumstances. Sufficiently small peptides have been shown to integrate into otherwise nonfouling polyethylene oxide (PEO) brush layers in accordance with their amphiphilicity and ordered structure, including nisin, and we have recently shown that nisin entrapment within a PEO layer does not compromise the nonfouling character of that layer. In this work we test the hypothesis that surface-bound, pendant PEO chains will inhibit displacement of entrapped nisin by competing proteins and, in this way, prolong retention of nisin activity at the interface. For this purpose, the antimicrobial activity of nisin-loaded, PEO-coated surfaces was evaluated against the gram-positive indicator strain, Pediococcus pentosaceous. The retained antimicrobial activity of nisin layers was evaluated on uncoated and PEO-coated surfaces after incubation in the presence of bovine serum albumin for contact periods up to 1 week. Nisin-loaded, uncoated and PEO-coated samples were withdrawn at selected times and were incubated on plates inoculated with P. pentosaceous to quantify nisin activity by determination of kill zone radii. Our results indicate that nisin activity is retained at a higher level for a longer period of time after entrapment within PEO than after direct adsorption in the absence of PEO, owing to inhibition of nisin exchange with dissolved protein afforded by the pendant PEO chains.

Estilos ABNT, Harvard, Vancouver, APA, etc.

48

Guo, Huiwen, Shaojie Tan, Jing Gao e Lu Wang. "Sequential release of drugs form a dual-delivery system based on pH-responsive nanofibrous mats towards wound care". Journal of Materials Chemistry B 8, n.º 8 (2020): 1759–70. http://dx.doi.org/10.1039/c9tb02522g.

Texto completo da fonte

Resumo:

Using Chitosan/PEO as the shell and PCL as the core, chitosan–polyethylene oxide/polycaprolactone nanofibrous mats were prepared successfully by coaxial electrospinning for co-load and sequential co-delivery of two drugs.

Estilos ABNT, Harvard, Vancouver, APA, etc.

49

Ma, Wen Shi, Fang Yang, Bang Jun Deng, Hai Yan Sun e Xiao Dan Lin. "Studies on Self-Assembly of Methoxy Polyethylene Oxide Propyl Trimethoxysilane on Silicon Substrate". Advanced Materials Research 557-559 (julho de 2012): 1916–20. http://dx.doi.org/10.4028/www.scientific.net/amr.557-559.1916.

Texto completo da fonte

Resumo:

A novel hydrophilic and self-assemble functional methoxy polyethylene oxide propyl trimethoxysilane was synthesized by hydrosilylation reaction using methoxy polyethylene oxide monoallyl ether and trimethoxysilane. The self-assembled layer of methoxy polyethylene oxide propyl trimethoxysilane was prepared by immersing hydroxylate silicon substrate in silane solution. The structure, morphology and hydrophilicity of self-assembled layer were characterized by means of X-ray photoelectron spectroscopy (XPS), atomic force microscopy (AFM), and water contact angle method. The results show that methoxy polyethylene oxide propyl trimethoxysilane can self-assemble on the surface of hydroxylate silicon substrate. At concentration of 0.80 g/100 mL and the self-assembling time of 60 minutes, the self-assembled layer of methoxy polyethylene oxide propyl trimethoxysilane of average molecular weight of 682 shows a brush-like structure with each brush column size of 10~15 nm in diameter and 5~8 nm in height. The correspondence of the columns height with the average length of the silane molecules suggests that the layer obtained is monolayer and the brush columns are constituted by extended PEO molecular chain units in the silane. The distribution of columns is uniform and the root-mean-square（RMS） roughness of self-assembled monolayer is 0.98 nm. Water contact angle of the monolayer is 7.4°. A super-hydrophilic surface is obtained.

Estilos ABNT, Harvard, Vancouver, APA, etc.

50

Zhu, Jin, Anni Jiang, Yongqian Shi, Xin Fan, Peng Dou, Daqian Ma e Xinhua Xu. "Hollow Sn–Ni nanoparticles coated with ion-conductive polyethylene oxide as anodes for lithium ion batteries with superior cycling stability". RSC Advances 5, n.º 51 (2015): 40807–12. http://dx.doi.org/10.1039/c5ra02956b.

Texto completo da fonte

Resumo:

A facile strategy is designed for the fabrication of hollow, Sn–Ni nanoparticles (NPs) surrounded by ion-conductive, polyethylene oxide (PEO) coating to address the structural and interfacial stability concerns facing Sn-based anodes.

Estilos ABNT, Harvard, Vancouver, APA, etc.

Artigos de revistas sobre o tema "Polyethylene oxide (POE)"

Crie uma referência precisa em APA, MLA, Chicago, Harvard, e outros estilos