Bibliografias temáticas / Polyethylene oxide (POE)

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Literatura científica selecionada sobre o tema "Polyethylene oxide (POE)"

Autor: Grafiati
Publicado: 8 de março de 2025

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

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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.

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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.
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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.

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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.
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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.

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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.
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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.

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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
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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.

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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.
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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.

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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.

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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).
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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.

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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.
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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.

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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.
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Lim, HakBeom, e Jae-Kwang Kim. "Li1.3Al0.3Ti1.7(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.

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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.
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Teses / dissertações sobre o assunto "Polyethylene oxide (POE)"

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Riquel-Loizelet, Noelline. "Assemblages supramoleculaires de type (pseudo)polyrotaxane : vers la synthèse de modèles biocompatibles de cellules musculaires". Electronic Thesis or Diss., université Paris-Saclay, 2025. http://www.theses.fr/2025UPASF004.

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En s'inspirant du vivant, le biomimétisme invite à développer de nouvelles familles de matériaux, pour des applications variées. Dans ce contexte, des assemblages supramoléculaires de type (pseudo)polyrotaxanes, semblables à des colliers de perles, pourraient permettre d'obtenir des matériaux innovants stimulables, par exemple des matériaux capables de mimer le mouvement d'un muscle sous l'effet d'un stimulus. L'objectif de cette thèse a été de synthétiser des (pseudo)polyrotaxanes biocompatibles et thermostimulables, à partir de γ-cyclodextrine (γ-CD) et de copolymères à blocs, constitués de poly(N-isopropylacrylamide) (PNIPAM) et de poly(oxyde d'éthylène) (POE), afin d'obtenir des matériaux dont les propriétés mécaniques pourraient être modifiées de manière réversible en réponse à un stimulus extérieur. Le PNIPAM a été choisi pour son caractère thermosensible, tandis que le POE, a lui été choisi pour son affinité particulière avec les cyclodextrines, facilitant ainsi leur enfilage. Au cours de ces travaux de thèse, la formation d'assemblages supramoléculaires avec des CDs a d'abord été étudiée en présence d'homopolymères de PNIPAM et de POE (de longueurs variables et d'extrémités variables), puis avec des copolymères diblocs, puis triblocs (ABA ou BAB), synthétisés selon différentes voies (couplage, ATRP, RAFT). La caractérisation des édifices a été réalisée en mobilisant diverses techniques d'analyse : RMN 1H, MALDI-TOF, DRX, CES et TGA. Les résultats ont montré que les γ-CDs s'enfilaient majoritairement sur le bloc de POE qu'il soit situé au centre ou aux extrémités des différents copolymères avec un nombre de CDs que l'on peut contrôler, en fonction de la stœchiométrie (γ-CDs) : (polymère) adoptée avant la complexation, la longueur des chaines, la température. Plusieurs architectures ont été proposées pour ces assemblages
Inspired by the living world, biomimicry encourages the development of new families of materials for a wide range of applications. In this context, (pseudo)polyrotaxane-type supramolecular assemblies, like strings of pearls, could make it possible to obtain innovative stimulable materials, for example materials capable of mimicking the movement of a muscle under the effect of a stimulus. The aim of this thesis was to synthesize biocompatible, thermostimulable (pseudo)polyrotaxanes from γ-cyclodextrin (γ-CD) and block copolymers, consisting of poly(N-isopropylacrylamide) (PNIPAM) and poly(ethylene oxide) (POE), in order to obtain materials whose mechanical properties could be reversibly modified in response to an external stimulus. PNIPAM was chosen for its thermosensitive properties, while POE was chosen for its particular affinity with cyclodextrins, making them easier to thread. During this thesis work, the formation of supramolecular assemblies with CDs was first studied in the presence of homopolymers of PNIPAM and POE (of variable lengths and variable ends), then with diblock, then triblock copolymers (ABA or BAB), synthesized by different routes (coupling, ATRP, RAFT). Characterization of the edifices was carried out by mobilizing various analytical techniques: 1H NMR, MALDI-TOF, DRX, CES and TGA. The results showed that γ-CDs threaded predominantly onto the POE block whether located in the center or at the ends of the various copolymers with a number of CDs that could be controlled, depending on the (γ-CDs):(polymer) stoichiometry adopted prior to complexation, chain length, temperature. Several architectures have been proposed for these assemblies
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Lu, Chen Pelton Robert H. "Mechanisms of filler flocculation with PEO/cofactor dual-component flocculants /". *McMaster only, 2003.

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Cong, Rongjuan Pelton Robert H. "PEO/poly(vinyl phenol-co-styrene sulfonate) aqueous complex formation /". *McMaster only, 2002.

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Duan, Xiadong. "Biomedical applications of dendrimer-modified polyurethanes with PEO (polyethylene oxide) attached". Thesis, University of Ottawa (Canada), 2001. http://hdl.handle.net/10393/9023.

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A novel approach was used to synthesize bioactive polyurethanes by applying polypropylenimine octaamine dendrimers as the chain extenders, while another approach trying to incorporate star PEO (polyethylene oxide) directly into polyurethane failed to attain appropriate polymers. A protection/deprotection strategy was used to incorporate the dendrimers into the polyurethane chains, then PEO was chemically attached after deprotection to increase the biocompatibility of the material. A generation 2.0 polypropylenimine octaamine dendrimer which has eight arms ending with amine groups, was used for the modification. The dendrimers were protected using the N-hydroxy-succinimide ester of a tert-butyloxycarbonyl (tBOC)-protected alanine or 9-Fluorenylmethyloxycarbonyl chlorocarbonate (Fmoc) in methylene chloride-triethylamine. A molar ratio of 6:1 (protecting group:dendrimer) was used to get a statistical distribution of protected dendrimers in which most of the dendrimers would have 6 arms protected. The partially protected dendrimers were used with ethylene diamine (ED) or butanediol (BDO) as a chain extender (molar ratio of dendrimer ED/DO = 1:9) to produce the dendrimer modified polyurethanes. After deprotection of the dendrimers, PEG-SPA (Polyethylene Glycol-Succinimidyl Propionate) was used to attach PEO to the polyurethane chains. (Abstract shortened by UMI.)
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Liu, Zaiwen. "Conformation and orientation of an alanine-rich polypeptide incorporated in electrospun PEO fibers". Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 60 p, 2008. http://proquest.umi.com/pqdweb?did=1597632371&sid=7&Fmt=2&clientId=8331&RQT=309&VName=PQD.

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Du, Ying Jun. "PEO and PEO-heparin modified surfaces for blood contacting applications /". *McMaster only, 2001.

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Hamilton-Brown, Paul Optometry &amp Vision Science Faculty of Science UNSW. "A surface forces and protein adsorption study of grafted PEO layers". Awarded by:University of New South Wales. School of Optometry and Vision Science, 2006. http://handle.unsw.edu.au/1959.4/25541.

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A combination of surface analytical techniques, colloid probe Atomic Force Microscopy (AFM) and X-ray Photoelectron Spectroscopy (XPS) was used to optimise the grafting density of covalently attached 5, 20 and 40 kDa methoxy-terminated PEO layers (under marginal solvation (cloud point) conditions for the PEO molecules). The combination of these techniques allowed us to relate the PEO layer density and molecular conformations to the range, magnitude and types of forces generated by coatings of various grafting densities. The key optimisation parameter was the grafting time with the concentration of PEO in solution having a weaker effect. Oxidation of the substrate occurred, but did not significantly limit the surface density of the functional groups used to chemically attach the PEO molecules. Interactions between the substrate and silica were electrostatic in origin and did not contribute to the interaction between silica and the PEO surfaces due to salt screening effects Surfaces with dense, highly stretched PEO layers (brushes) generated purely repulsive forces at all separation distances, arising from compression by the silica spherical probe used. The force profiles for lower density surfaces comprised long-ranged attractive and short-ranged repulsive forces. The attractive forces were most likely due to attractive bridging interactions between the PEO chains and the SiO2 surface. For low grafting densities, i.e. inter-chain grafting distances, s > ??RF, the PEO layers were not strongly stretched and free to adsorb onto the opposing silica surface. XPS analysis demonstrated that HSA and Fibrinogen adsorbed onto low density 20 kDa PEO coatings (s > ??RF), most likely via diffusion through the PEO layer. No protein adsorption was found (detection limit > 10 ng/cm2) on high density, ???strongly stretched brush??? coatings (s < ?? RF). Analysis of data from the more sensitive Time-of-Flight Secondary Ion Mass Spectrometry (ToF-SIMS) techniques indicated that low amounts of adsorbed HSA, lactoferrin, lysozyme, and IgG were present on high density 20 and 40 kDa surfaces; the most likely explanation being attractive interactions between the proteins and the PEO layers during the protein adsorption experiments. ToF-SIMS data obtained for the strongly stretched (s < ?? RF) 5 kDa PEO surfaces suggested that no protein was adsorbed, in line with the XPS data for the same surfaces.
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Thar, Dhaval. "Acetone Induced Structural Effects on Charge Storage in PEO-Graphite Supercapacitor Electrodes". University of Cincinnati / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1490351036541031.

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Chen, Wei. "Local Structure and Molecular Dynamics of Supramolecules And Semicrystalline Polymers As Investigated By Solid State NMR". University of Akron / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=akron1459960834.

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Shi, Jingjun. "Chain Dynamics in the Crystalline Region of Polyethylene Oxide (PEO) as Investigated by Solid-State NMR". University of Akron / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=akron1428341117.

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Livros sobre o assunto "Polyethylene oxide (POE)"

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Sharma, Sandeep K. Dewatering of Alaska placer effluent using PEO. Washington, D.C. (810 7th St., N.W., Washington 20241-0001): U.S. Dept. of the Interior, Bureau of Mines, 1992.

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Sharma, Sandeep K. Dewatering of Alaska placer effluent using PEO. Washington, DC: U.S. Dept. of the Interior, Bureau of Mines, 1992.

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Capítulos de livros sobre o assunto "Polyethylene oxide (POE)"

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Steiner, G., e C. Zimmerer. "Polyethylene oxide (PEO)". In Polymer Solids and Polymer Melts – Definitions and Physical Properties I, 840–48. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-32072-9_92.

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Raghavan, Prasanth, P. P. Abhijith, N. S. Jishnu, Akhila Das, Neethu T. M. Balakrishnan, Fatima M. J. Jabeen e Jou-Hyeon Ahn. "Polyethylene Oxide (PEO)-Based Solid Polymer Electrolytes for Rechargeable Lithium-Ion Batteries". In Polymer Electrolytes for Energy Storage Devices, 57–80. First edition | Boca Raton : CRC Press, 2021.: CRC Press, 2021. http://dx.doi.org/10.1201/9781003144793-3.

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"Polyethylene oxide (PEO)". In Encyclopedic Dictionary of Polymers, 751. New York, NY: Springer New York, 2007. http://dx.doi.org/10.1007/978-0-387-30160-0_8930.

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Satchanska, Galina. "Growing Environmental Bacterium Biofilms in PEO Cryogels for Environmental Biotechnology Application". In Bacterial Biofilms [Working Title]. IntechOpen, 2022. http://dx.doi.org/10.5772/intechopen.104813.

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This Chapter discusses the entrapment, growing and biofilm formation by an environmental bacterium immobilized in polyethyleneoxide cryogel to be applied in environmental biotechnology. The KCM-R5 bacterium was isolated from the heavy metal-polluted environment near a large Pb-Zn smelter, also producing precious metals in Bulgaria. Molecular-genetic analysis revealed affiliation with Pseudomonas rhodesiae. The strain is capable of growing in high concentrations of phenol and different phenol derivatives. Polyethylene oxide was found to be friendly and nontoxic to bacteria polymer enabling bacteria easy to penetrate in it and fast to grow. KCM-R5 biofilms were grown for 30 days in batch culture with phenol (300-1000 mg L−1) dissolved in the mineral medium. The bacterium was able to involve phenol in its metabolism and use it as a single carbon supplier. The results obtained in the study showed 98% phenol biodegradation using the biotech installation described. The proposed PEO cryogel-P. rhodesiae KCM-R5 bacterium biotech biofilter can be used for environmental biotechnology application in industrial wastewater detoxification.
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Chawla, Priyanka, Shivangi Trivedi e Kumari Pooja. "Investigation on Various Polymer Electrolytes for Development of Dye Sensitized Solar Cell". In Materials Science: A Field of Diverse Industrial Applications, 158–73. BENTHAM SCIENCE PUBLISHERS, 2023. http://dx.doi.org/10.2174/9789815051247123010012.

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Dye sensitized solar cells (DSSCs) based on TiO2 nanoparticles film have attracted extensive attention from both industry and academia. Generally, the liquid electrolyte is used in dye sensitized solar cells, but the vaporization of liquid electrolyte hinders its commercialization as its affects its stability. And also the reduction in performance of dye sensitized solar cells was observed due to electron recombination in semiconductor liquid electrolyte interfaces. The situation worsens when the photoanode is in contact with the vaporization of electrolyte solution that affects the charge distribution at the semi conductor electrolyte interface and initiates photo corrosion on the photoanode. With the finding of ionic conductivity in polymer, electrolytes complexed with salt give a breakthrough to the development of DSSC devices. Various types of electrolytes have been developed and tested in different DSSCs configurations to overcome this problem. Among all polymer electrolytes, PEO (Polyethylene oxide) based polymer electrolyte has shown excellent performance in different electrochemical application areas. In DSSCs, it is also considered a novel candidate due to its excellent ability to form complexes with ionic salts. Poly(vinyl alcohol) (PVA) is also a promising candidate acting as a host polymer due to its inherent characteristics like high mechanical strength, good tensile strength, high temperature resistance, non toxicity, good optical properties and high hydrophilicity. PVA have a large extent of poly hydroxyl group, which makes PVA highly hydrophile. It also offers other advantages like excellent chemical stability, ease of preparation, and flexibility. In the present paper, we review different types of polymer electrolytes which have been used for improving the performance and stability of DSSCs.
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Wu, Chi-San, Larry Senak, Donna Osborne e Tom M. H. Cheng. "Comparison of Four Commercial Linear Aqueous Size Exclusion Columns and Four Sets of Commercial Polyethylene Oxide (PEO) Standards for Aqueous Size Exclusion Chromatography of Polyvinylpyrrolidone and PEO". In Column Handbook for Size Exclusion Chromatography, 499–529. Elsevier, 1999. http://dx.doi.org/10.1016/b978-012765555-0/50018-x.

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Trabalhos de conferências sobre o assunto "Polyethylene oxide (POE)"

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A. Ahmad, Ahmad, Qais M. Al-Bataineh, Lina A. Alakhras e Ahmad Telfah. "Explosive Percolation Phenomenon Of High Conductive Polyethylene Oxide/Titanium Nanocomposite Films". In 5th World Conference on Chemistry and Chemical Engineering and 5th World Conference on Advanced Materials, Nanoscience and Nanotechnology, 29. Eurasia Conferences, 2024. https://doi.org/10.62422/978-81-970328-7-5-013.

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This work investigated the percolation phenomenon and its effect on the electrical conductivity and other physical properties of polyethylene oxide/titanium nanoparticles (PEO/TiNPs) nanocomposite films. The electrical conductivity increases abruptly from 1.92×10−3 S.cm−1 to 86.66 S.cm−1 after percolation threshold, followed by constant values at the conductive zone, indicating the formation of conductive pathways through the PEO/TiNPs nanocomposite film. In addition, the localized surface plasmon resonance effect on the percolation phenomenon was investigated accordingly. Scanning electron microscopy images revealed the distribution and morphology of TiNPs in the PEO matrix. Finite element method simulations were used to understand the percolation phenomenon of the nanocomposite films. Fourier-transform infrared spectroscopy confirms the absence of any chemical bonds between TiNPs and PEO. On the other hand, X-ray diffraction and differential scanning calorimetry show that increasing TiNPs in the PEO matrix increases the crystallinity degree of the nanocomposites. The thermal properties of the PEO/TiNPs nanocomposite films were investigated. This study provides valuable insights into the design and fabrication of nanocomposite materials for electronic and optoelectronic applications.
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Ahmad, Hafiz, M'hamed Boutaous, Shihe Xin, Hervé Pabiou e Dennis A. Siginer. "Rheological Characterization of Polyethylene Oxide (PEO): An Experimental Steady State and Transient Analysis". In ASME 2020 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/imece2020-23553.

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Abstract In this paper, the rheological characteristics of aqueous PEO (Polyethylene oxide) solution with very high molecular weight 4 × 106 g/mol is investigated. Shear flow measurements were carried out in steady and transient modes. The unique behavior of PEO is found to be heavily dependent on the input shear rate and the mechanism of data generation. Generally, PEO is found to be shear-thinning throughout the experiments, but at the start of the experiments at low shear rates, minimum input shear value also affects the shear-thinning behavior. In this study, we investigate the critical method of applying input shear to the samples in the lower shear rate regime. Surprisingly, different input methods yield different results. Viscosity curves obtained through shear flow experiments are found to be significantly dependent on the input method of shear rate. Experimental measurements were validated by Cross and Carreau-Yasuda models.
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Trine, Eric Brandon, Gary Arnold Pope, Chris James Britton, Robert Matthew Dean e Jonathan William Driver. "Novel Application of Polyethylene Oxide Polymer for EOR from Oil-Wet Carbonates". In SPE Improved Oil Recovery Conference. SPE, 2022. http://dx.doi.org/10.2118/209446-ms.

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Abstract The objective of this study was to test the performance of high-molecular weight polyethylene oxide (PEO) polymer in a low-permeability, oil-wet carbonate reservoir rock. Conventional HPAM polymers of similar molecular weight did not exhibit acceptable transport in the same rock, so PEO was explored as an alternative polymer. Viscosity, pressure drop across each section of the core, oil recovery, and polymer retention were measured. The PEO polymer showed good transport in the 23 mD reservoir carbonate core and reduced the residual saturation from 0.29 to 0.17. The reduction of residual oil saturation after polymer flooding using PEO was unexpected and potentially significant.
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Sethupathy, M., V. Sethuraman, J. Anandha Raj, P. Muthuraja e P. Manisankar. "Electrospun polyethylene oxide (PEO) nanofiber membranes based polymer electrolyte for dye sensitized solar cell". In LIGHT AND ITS INTERACTIONS WITH MATTER. AIP Publishing LLC, 2014. http://dx.doi.org/10.1063/1.4898250.

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Laudon, S., M. Balhoff e K. Mohanty. "The Effect of Polyethylene Oxide on Residual Oil Saturation of Low Permeability Carbonates". In SPE Improved Oil Recovery Conference. SPE, 2024. http://dx.doi.org/10.2118/218150-ms.

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Abstract The objective of this paper is to investigate the transport and incremental oil recovery associated with Polyethylene Oxide (PEO) compared to Hydrolyzed Polyacrylamide (HPAM) through a series of corefloods in low permeability carbonate cores for use in enhanced oil recovery (EOR). Recent studies have brought attention to PEO's improved injectivity in low permeability carbonate reservoirs compared to acrylamide-based polymers offering a promising alternative (Mejia et al., 2022a; Mejia et al., 2022b; Trine et al., 2022). Five two-phase experiments were conducted in Indiana limestone cores (permeability &lt;100 mD) with PEO and HPAM of similar molecular weights (4 MM Dalton) and viscosity; they were designed to measure incremental oil recovery for both polymers. Tracer tests were completed to determine heterogeneity. Brine was displaced by a 50-cP oil, and initial oil saturations averaged 55.8%. The oil was displaced initially with a waterflood for 3-5 pore volumes. The waterflood, on average, recovered 60.7% of original oil in place (OOIP). Oil cut was consistently zero at the conclusion of the waterflood suggesting the cores were at or near residual oil saturation. The polymer flood followed the waterflood for three pore volumes or until oil cut was zero. HPAM was injected in the first two experiments, and PEO was injected in the final three. When HPAM was injected, oil production in terms of OOIP from the polymer flood was minimal (average 2.2%) which was expected since oil saturation was presumed near residual. However, in the experiments when PEO was injected, oil production from the polymer flood averaged 13.5%, suggesting that residual oil saturation was decreased by the polymer. PEO was consistently shown to produce more oil compared to HPAM. This work suggests that PEO may result in higher oil recoveries and reduced residual oil saturation under certain conditions.
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Hanif, M. P. M., A. J. Jalilah e K. K. Nitiyah. "The impact of chemically-treated carbonized wood fiber (CWF) in polyethylene oxide (PEO)/chitosan blend films". In PROCEEDINGS OF GREEN DESIGN AND MANUFACTURE 2020. AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0044191.

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Fuhrhop, Carlos, e Anthimos Georgiadis. "Coplanar micro-strips/electrospun sensor system to measure the electronics properties of the polyethylene oxide (PEO) electrospun". In 2015 IEEE International Symposium on Medical Measurements and Applications (MeMeA). IEEE, 2015. http://dx.doi.org/10.1109/memea.2015.7145257.

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Ma, Jian, Qian Zhang, Anthony Mayo, Richard Mu, Leon Bellan e Deyu Li. "Thermal Conductivity of Individual Electrospun Polymer Nanofibers". In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-50483.

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In this work, the thermal conductivity of individual polyethylene (PE) nanofibers fabricated by electrospinning was experimental measured. Our results show that polyethylene nanofibers can have a thermal conductivity up to 2.6 Wm−1K−1, (more than 9 times higher than the bulk PE value) and that the thermal conductivity is strongly correlated with the electric field intensity used in electrospinning. This, combined with micro-Raman characterization of individual nanofibers, suggests that the enhanced thermal conductivity is due to the high degree of orientation of the polymer chains. The stronger elongational forces experienced by the jet at higher electrospinning voltage result in the formation of nanofibers with a higher degree of molecular orientation. Similar thermal conductivity enhancement is also observed with other polymer nanofibers including polyethylene oxide (PEO), Nylon-6, and polyvinylidene fluoride (PVDF). Collectively, our results indicate that electrospinning could be an effective approach to produce polymer nanofibers with enhanced thermal conductivity.
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Barrera, Carola, T. Gould, K. Hyde, G. Montero, J. P. Hinestroza e C. Rinaldi. "Electrospun Magnetic Nanofibers With Anti-Counterfeiting Applications". In ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-82899.

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Polyethylene oxide (PEO) nanofibers containing discrete magnetic domains have been produced using both parallel plate and syringe-plate electrospinning configurations. Magnetite nanoparticles from a commercial ferrofluid (MSG W11, Ferrotech Corporation) were suspended in 1–2 wt% PEO-in-water solutions and electrospun to produce fibers with diameters as small as 150 nm. Transmission electron microscopy was used to study particle agglomeration in the resulting nanofibers as a function of particle loading and electrospinning conditions. Magnetic measurements using a SQUID magnetometer were used to characterize the DC and AC magnetic response of the fibers. Applications to anti-counterfeiting in the textile industry are discussed.
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Özen, İlhan, Peng Wu, Kamyar Shirvanimoghaddam e Minoo Naebe. "Pectin/chaste berry oil nanoemulsions and nanofibers for women's medical textiles". In 7th International Scientific Conference Contemporary Trends and Innovations in Textile Industry – CT&ITI 2024, 139–46. Union of Engineers and Technicians of Serbia, Belgrade, 2024. http://dx.doi.org/10.5937/ct_iti24016o.

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Pectin(P)/chaste berry oil (CBO) nanoemulsions (NEs) and nanofibers (NFs) were generated and characterized in this study. First, processing conditions of CBO NEs were optimised employing ultrasonication process by using aqueous pectin solutions. An ultrasonication time of 5 min in the absence of a surfactant, i.e., Tween 80, delivered the smallest droplet sizes of 329±10 nm. Electrospinning solutions containing P/CBO NEs were prepared with the addition of polyethylene oxide (PEO), dimethyl oxide (DMSO), and Triton X-100. Electrospinning processing conditions were optimised to obtain stable and homogeneous fibrous membranes of P/CBO NEs. Neat pectin nanofibers exhibited a fiber diameter of ca. 400 nm. Addition of CBO increased the fiber diameters (ca. 500 nm) and pore sizes generally.
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