Journal articles: 'Gas barrier properties'

1

Shirakura, Akira, Takanori Mori, and Tetsuya Suzuki. "Improvement of Gas Barrier Properties." Seikei-Kakou 27, no. 8 (July 20, 2015): 327–31. http://dx.doi.org/10.4325/seikeikakou.27.327.

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Cui, Yanbin, S. Kumar, Balakantha Rao Kona, and Daniel van Houcke. "Gas barrier properties of polymer/clay nanocomposites." RSC Advances 5, no. 78 (2015): 63669–90. http://dx.doi.org/10.1039/c5ra10333a.

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FROUNCHI, M., S. DADBIN, Z. SALEHPOUR, and M. NOFERESTI. "Gas barrier properties of PP/EPDM blend nanocomposites." Journal of Membrane Science 282, no. 1-2 (October 5, 2006): 142–48. http://dx.doi.org/10.1016/j.memsci.2006.05.016.

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Kalendova, Alena, Dagmar Merinska, Jean Francois Gerard, and Miroslav Slouf. "Polymer/clay nanocomposites and their gas barrier properties." Polymer Composites 34, no. 9 (June 13, 2013): 1418–24. http://dx.doi.org/10.1002/pc.22541.

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Salame, Morris. "Prediction of gas barrier properties of high polymers." Polymer Engineering and Science 26, no. 22 (December 1986): 1543–46. http://dx.doi.org/10.1002/pen.760262203.

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KURAOKA, Koji, Yuta SHIMMEN, Hidetoshi KATO, Hiroyasu SEKI, and Takeshi NISHIKAWA. "Preparation and gas barrier properties of organic–inorganic hybrid gas barrier membranes using 3-glycidoxypropyl silsesquioxane." Journal of the Ceramic Society of Japan 128, no. 4 (April 1, 2020): 229–32. http://dx.doi.org/10.2109/jcersj2.20004.

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Liu, Yiwu, Ao Tang, Jinghua Tan, Yuhui Li, Ding Wu, Xiang Zhang, Xianqing Zhao, Pan He, and Hailiang Zhang. "High-barrier polyimide containing fluorenol moiety: Gas barrier properties and molecular simulations." Reactive and Functional Polymers 157 (December 2020): 104747. http://dx.doi.org/10.1016/j.reactfunctpolym.2020.104747.

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Liu, Yiwu, Ao Tang, Jinghua Tan, Xianqing Zhao, Chengliang Chen, Ding Wu, Yuhui Li, Pan He, and Hailiang Zhang. "High-Barrier Polyimide Containing Carbazole Moiety: Synthesis, Gas Barrier Properties, and Molecular Simulations." Polymers 12, no. 9 (September 8, 2020): 2048. http://dx.doi.org/10.3390/polym12092048.

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A high-barrier polyimide (2,7-CPI) was synthesized through the polymerization of pyromellitic dianhydride (PMDA) and a novel diamine (2,7-CDA) containing carbazole moiety. The synthesized diamine and polyimide were fully characterized by elemental analyses, FTIR and NMR. The 2,7-CPI displays very attractive barrier performances, with oxygen transmission rate (OTR) and water vapor transmission rate (WVTR) low to 0.14 cm3·m−2·day−1 and 0.05 g·m−2·day−1, respectively. Meanwhile, 2,7-CPI also exhibits exceptional thermal stability with a glass transition temperature (Tg) of 467 °C, 5% weight-loss temperature (Td5%) of 550 °C under N2 and coefficient of thermal expansion (CTE) of 3.4 ppm/K. The barrier performances of 2,7-CPI are compared with those of a structural analogue (2,7-CPPI) and a typical polyimide (Kapton). Their barrier performances with respect to microstructure were investigated by molecular simulations, wide angle X-ray diffraction (WAXD), and positron annihilation lifetime spectroscopy (PALS). The results show that 2,7-CPI possesses better coplanar structure and more number of intermolecular hydrogen bonds among the three PIs, which result in tight chain packing and thereby high crystallinity, low free volume, and decreased chains mobility. That is, the high crystallinity and low free volume of 2,7-CPI reduce the diffusion and solubility of gases. Meanwhile, the poor chains mobility further decreases the gases diffusion. The reduced diffusion and solubility of gases consequently promote the improvement of barrier properties for 2,7-CPI. The polyimide has a wide application prospect in the field of flexible electronic packaging industries.

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Takahashi, S., H. A. Goldberg, C. A. Feeney, D. P. Karim, M. Farrell, K. O'Leary, and D. R. Paul. "Gas barrier properties of butyl rubber/vermiculite nanocomposite coatings." Polymer 47, no. 9 (April 2006): 3083–93. http://dx.doi.org/10.1016/j.polymer.2006.02.077.

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NISHIURA, Katsunori. "Polymer-Inorganic Hybrid Coatings Having High Gas Barrier Properties." Kobunshi 56, no. 3 (2007): 139. http://dx.doi.org/10.1295/kobunshi.56.139.

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Ou, Cheng-Fang, and Po-Hung Shen. "Thermal and Gas Barrier Properties of COC/SiO2 Nanocomposites." Polymers and Polymer Composites 20, no. 6 (July 2012): 537–44. http://dx.doi.org/10.1177/096739111202000604.

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12

Jacquelot, E., E. Espuche, J. F. Gérard, J. Duchet, and P. Mazabraud. "Morphology and gas barrier properties of polyethylene-based nanocomposites." Journal of Polymer Science Part B: Polymer Physics 44, no. 2 (2005): 431–40. http://dx.doi.org/10.1002/polb.20707.

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13

Lee, Jong-Chan, Morton H. Litt, and Charles E. Rogers. "Oxyalkylene polymers with alkylsulfonylmethyl side chains: Gas barrier properties." Journal of Polymer Science Part B: Polymer Physics 36, no. 1 (January 15, 1998): 75–83. http://dx.doi.org/10.1002/(sici)1099-0488(19980115)36:1<75::aid-polb9>3.0.co;2-t.

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van Rooyen, L. J., H. Bissett, M. C. Khoathane, and J. Karger-Kocsis. "Gas barrier properties of oxyfluorinated graphene filled polytetrafluoroethylene nanocomposites." Carbon 109 (November 2016): 30–39. http://dx.doi.org/10.1016/j.carbon.2016.07.063.

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15

Feng, Qian, Peng Shi, Jie Zhao, Kai Du, Yu Kun Li, Qing Feng, and Yue Hao. "Transport Properties of Two-Dimensional Electron Gas in Cubic AlGaN/GaN Heterostructures." Advanced Materials Research 873 (December 2013): 777–82. http://dx.doi.org/10.4028/www.scientific.net/amr.873.777.

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We presented a theoretical study of the dependence of 2DEG mobility on temperature, barrier thickness, Al content, donor concentration to reveal the internal physics of 2DEG mobility in cubic AlGaN/GaNheterostructures. The 2DEG mobility is modeled as a combined effect of the scattering mechanisms including acoustic phonons, ionized impurity, dislocation, alloy disorder and interface roughness scattering.The variation of mobility results mainly from the change of 2DEG density and temperature. It reveals the dominant scattering mechanismsare dislocation and alloy disorder scattering atlow temperature.Acoustic phonons scattering becomes the major limit at 300k. Impurity scattering plays the key role when donor density rises. We find a maximum mobility with a structure of 25% Al content and 4-5nm barrier thickness.

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Mohan, Turup P., and Krishnan Kanny. "Mechanical and barrier properties of copolyester-nanoclay composites." Journal of Polymer Engineering 34, no. 6 (August 1, 2014): 511–20. http://dx.doi.org/10.1515/polyeng-2013-0202.

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Abstract This paper examines the influence of nanoclay on the structure, thermal and mechanical and gas barrier properties of a polyethylene terephthalate (PET)-based copolyester using a new modified formula. The copolyester considered in this work consists of partially replaced acid and diol monomers in main chain PET polymers, namely, polyethylene glycol (PEG) and isophthalic acid monomers, i.e., PET-IP. Nanoclays were filled from 0–3 wt% in PET-IP using the melt mixing method. The structural examination of composites tested by X-ray diffraction (XRD) and transmission electron microscopy (TEM) revealed the distribution of nanolayers of clay particles in polymeric matrix. Up to 1 wt% nanoclay in PET-IP, an exfoliated structure resulted and above 1 wt% nanoclay an intercalated structure resulted. It was observed that 0.5 wt% nanoclay filled PET-IP resulted in improved nucleation characteristics and above 0.5 wt% nanoclay dramatically increased the gas transport (CO2, O2, N2 and water vapor), thermal and mechanical properties. The results also showed that the distribution of nanoclays affected the gas barrier properties of the polymer and can be controlled by processing parameters.

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LAI, HUAN-WEN, XUEAN ZHAO, and YOU-QUAN LI. "SPIN FILTERING IN THE DOUBLE-BARRIER STRUCTURE." International Journal of Modern Physics B 19, no. 06 (March 10, 2005): 989–97. http://dx.doi.org/10.1142/s0217979205029420.

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In this paper, we study the electron transport properties in the double non-collinear δ-magnetic barriers within 2-dimensional electron gas. We find that the transmission of spin current depends on the relative orientation of each magnetic barrier. In addition to the well-known unpolarized configurations in an antiparallel magnetic barrier structure, we also find that there exists infinite unpolarized structures due to the time-reversal symmetry. These structures will be important in the designs of spin valve.

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Otrisal, Pavel, Karel Friess, Martin Urban, Simona Bungau, Delia Mirela Tit, Danut-Eugeniu Mosteanu, Zdenek Melicharik, Constantin Bungau, and Lotfi Aleya. "Barrier properties of anti-gas military garments, considering exposure to gas organic compounds." Science of The Total Environment 714 (April 2020): 136819. http://dx.doi.org/10.1016/j.scitotenv.2020.136819.

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WATANABE, Haruhiko. "The properties of high gas barrier polymer and their application." Journal of the Surface Finishing Society of Japan 40, no. 6 (1989): 727–31. http://dx.doi.org/10.4139/sfj.40.727.

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20

Tipachan, Chuenkhwan, and Somjai Kajorncheappunngam. "Biodegradable Poly(Lactic Acid)/Perkalite Clay Nanocomposites: Gas Barrier Properties." Key Engineering Materials 718 (November 2016): 10–14. http://dx.doi.org/10.4028/www.scientific.net/kem.718.10.

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Nanocomposite films based on poly (lactic) acid (PLA) and organically nanoclay Perkalite were prepared by solvent casting method. The incorporation of Perkalite clay in PLA film was characterized by Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) techniques. Morphology of PLA/Perkalite film was investigated using scanning electron microscope (SEM). The gas barrier properties of PLA nanocomposite films were determined through oxygen transmission rate (OTR) and water vapor transmission rate (WVTR) measurement. Results from FTIR analysis indicates that Perkalite clay was incorporated in PLA film. SEM images show that dispersion of Perkalite particle on the PLA matrix was good with the additional of clay up to 3 pph (parts of clay per hundred part of PLA). The maximum reduction in OTR and WVTR of that nanocomposite film with Perkalite loading of 3 pph are 76% and 37%, respectively compared with neat PLA film. This proves that gas barrier property of PLA film is improved significantly with incorporation of Perkalite clay. The PLA/Perkalite nanocomposite film is a promising as green based packaging materials.

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Howells, D. G., B. M. Henry, Y. Leterrier, J. A. E. Månson, J. Madocks, and H. E. Assender. "Mechanical properties of SiOx gas barrier coatings on polyester films." Surface and Coatings Technology 202, no. 15 (April 2008): 3529–37. http://dx.doi.org/10.1016/j.surfcoat.2007.12.030.

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22

Fernandes Nassar, Samira, Nicolas Delpouve, Cyrille Sollogoub, Alain Guinault, Gregory Stoclet, Gilles Régnier, and Sandra Domenek. "Impact of Nanoconfinement on Polylactide Crystallization and Gas Barrier Properties." ACS Applied Materials & Interfaces 12, no. 8 (February 3, 2020): 9953–65. http://dx.doi.org/10.1021/acsami.9b21391.

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23

Liu, Qin, Yang Wei-Min, Ding Yu-Mei, and Jiao Zhi-Wei. "Preparation and properties of gas barrier resin/rubber nanolaminated composites." Polymer Engineering & Science 55, no. 1 (March 11, 2014): 190–95. http://dx.doi.org/10.1002/pen.23884.

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Boufarguine, Majdi, Alain Guinault, Guillaume Miquelard-Garnier, and Cyrille Sollogoub. "PLA/PHBV Films with Improved Mechanical and Gas Barrier Properties." Macromolecular Materials and Engineering 298, no. 10 (December 19, 2012): 1065–73. http://dx.doi.org/10.1002/mame.201200285.

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YANAGIHARA, Hideto. "Various Properties of Plastic Bottles with Gas Barrier Properties Enhanced by DLC Coating." Journal of the Surface Finishing Society of Japan 65, no. 4 (2014): 158–61. http://dx.doi.org/10.4139/sfj.65.158.

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Park, Minwook, Dae-Yoon Kim, Dong-Gue Kang, Won-Jin Yoon, Yu-Jin Choi, Joong Hee Lee, and Kwang-Un Jeong. "Multilayer thin films for the construction of active repulsive hydrogen barriers." Journal of Materials Chemistry A 6, no. 6 (2018): 2456–60. http://dx.doi.org/10.1039/c7ta09116h.

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27

Takei, Satoshi. "Development of Inorganic Gas Barrier Material in Solar Cell Devices for Planarization Properties and Sublimate Defect Reduction." Advanced Materials Research 383-390 (November 2011): 3197–201. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.3197.

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This study focuses on inorganic gas barrier material in the advanced process techniques of solar cell devices for planarization properties and sublimate defect reduction. The inorganic gas barrier material have been optimized and studied for excellent surface planarization property. The newest approach by excellent collaborations from both process and material has the planarization property on an irregular substrate such as the patterned steps, via and trenches to increase the depth of focus and pattering resolution. A remarkable reduction in via topography with 0.6 μm as a depth and 0.13 μm as a diameter has been achieved excellent thickness bias less than 50 nm in 220 nm blanket field thickness. In addition, the sublimate amount of the film obtained from the developed inorganic gas barrier material was low as compared with that of the film obtained from the referenced organic non-gas barrier material.

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Oda, Akinori, and Takashi Kimura. "Modeling of Dielectric Barrier Discharges in Xe/O2 Gas Mixture Influence of O2 Gas Addition on Xe Barrier Discharge Properties." IEEJ Transactions on Fundamentals and Materials 123, no. 12 (2003): 1253–58. http://dx.doi.org/10.1541/ieejfms.123.1253.

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29

Dabbaghianamiri, Maedeh, Sayantan Das, and Gary W. Beall. "Improvement Approach for Gas Barrier Behavior of Polymer/Clay Nanocomposite Films." MRS Advances 2, no. 57 (2017): 3547–52. http://dx.doi.org/10.1557/adv.2017.458.

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ABSTRACTPolymer nanocomposites (PNC) include a copolymer or polymer which has nanoparticles dispersed in the polymer matrix at the nano-level. One of the most common types of polymer nanocomposites contain smectic clays as the nanoparticles. These clay minerals increase the mechanical properties of standard polymers and improve barrier properties. For optimum barrier properties, Layer-by-Layer assembly (LbL) is one of the most effective methods for depositing thin films. LbL methods however, are quite tedious and produce large quantities of waste. A newly discovered phenomenon of self-assembled polymer nanocomposites utilizes entropic forces to drive the assembly to spontaneously form a larger nanostructured film. This approach allows polymers and nanoparticles with high particle loadings to be mixed, and create the super gas barrier films. We have developed a coating technique which can be employed to make self-assembled gas barrier films via inkjet printing. This technique is industrially scalable and efficient. This is because it does not need any rinsing step and drying steps as required in LbL. The influence of different polymers Polyvinylpyrrolidone (PVP) and Poly (acrylic acid) PAA with Montmorillonite (MMT) nanoclay solutions on Polyethylene terephthalate (PET) substrate is examined to study their effectiveness as a gas barrier film. The results showing the excellent oxygen barrier behavior of a combination of PVP and MMT Nano clay nanocomposite with high transparency. These high barrier gas nanocomposite films are good candidates for a variety of food packaging applications.

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Wen, Qian, Ao Tang, Chengliang Chen, Yiwu Liu, Chunguang Xiao, Jinghua Tan, and Duxin Li. "Impact of Backbone Amide Substitution at the Meta- and Para-Positions on the Gas Barrier Properties of Polyimide." Materials 14, no. 9 (April 21, 2021): 2097. http://dx.doi.org/10.3390/ma14092097.

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This study designed and synthesised a meta-amide-substituted dianiline monomer (m-DABA) as a stereoisomer of DABA, a previously investigated para-amide-substituted dianiline monomer. This new monomer was polymerised with pyromellitic dianhydride (PMDA) to prepare a polyimide film (m-DABPI) in a process similar to that employed in a previous study. The relationship between the substitution positions on the monomer and the gas barrier properties of the polyimide film was investigated via molecular simulation, wide-angle X-ray diffraction (WXRD), and positron annihilation lifetime spectroscopy (PALS) to gain deeper insights into the gas barrier mechanism. The results showed that compared with the para-substituted DABPI, the m-DABPI exhibited better gas barrier properties, with a water vapour transmission rate (WVTR) and an oxygen transmission rate (OTR) as low as 2.8 g·m−2·d−1 and 3.3 cm3·m−2·d−1, respectively. This was because the meta-linked polyimide molecular chains were more tightly packed, leading to a smaller free volume and lower molecular chain mobility. These properties are not conducive to the permeation of small molecules into the film; thus, the gas barrier properties were improved. The findings have significant implications for the structural design of high-barrier materials and could promote the development of flexible display technology.

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Al-Abduljabbar, A. "Modeling Gas Barrier Property Improvements in Polymer-Clay Nano-Composites." Journal of Nano Research 29 (December 2014): 75–84. http://dx.doi.org/10.4028/www.scientific.net/jnanor.29.75.

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Polymer-clay nanocomposites (PCNC) offer better properties at very low volume fraction of the nanofiller compared to conventional polymer composites, thus minimizing the effect on other favored properties of the polymer. The mechanism by which clay platelets, which have thicknesses of a few nanometers in size compared with several hundred nanometers in the other two dimensions, introduce mechanical and other properties improvement can be attributed to their high efficiency in introducing a discontinuity to flows through the bulk matrix polymer material. The extent of this improvement depends on the success of intercalation or separation of the clay platelets through the bulk matrix. This paper contains a general overview of polymer-clay nanocomposites in terms of properties and processing. The improvements in gas barrier properties are discussed in detail; and a model to represent the effect of introduction of nanofillers on the permeability is proposed. The model builds on previous models to explain the improvements in the gas barrier properties due to the presence of clay nanoparticles and by assuming a proper distribution of these particles.

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32

Wen, Shipeng, Rui Zhang, Zongchao Xu, Long Zheng, and Li Liu. "Effect of the Topology of Carbon-Based Nanofillers on the Filler Networks and Gas Barrier Properties of Rubber Composites." Materials 13, no. 23 (November 28, 2020): 5416. http://dx.doi.org/10.3390/ma13235416.

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The topology of nanofillers is one of the key factors affecting the gas barrier properties of rubber composites. In this research, three types of carbon-based nanofillers, including spherical carbon black (CB), fibrous carbon nanotubes (CNTs), and layered graphene (GE) were chosen to investigate the effect of the topological structures of nanofillers on the gas barrier properties of styrene-butadiene rubber (SBR) composites. Results showed that the structure and strength of the filler networks in SBR composites were closely associated with the topology of nanofillers. When filled with 35 phr CB, 8 phr CNTs, and 4 phr GE, the SBR composites had the same strength of the filler network, while the improvement in gas barrier properties were 39.2%, 12.7%, and 41.2%, respectively, compared with pure SBR composites. Among the three nanofillers, GE exhibited the most excellent enhancement with the smallest filler content, demonstrating the superiority of two-dimensional GE in improving the barrier properties of rubber composites.

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Chawla, Vipin, Mikko Ruoho, Matthieu Weber, Adib Chaaya, Aidan Taylor, Christophe Charmette, Philippe Miele, Mikhael Bechelany, Johann Michler, and Ivo Utke. "Fracture Mechanics and Oxygen Gas Barrier Properties of Al2O3/ZnO Nanolaminates on PET Deposited by Atomic Layer Deposition." Nanomaterials 9, no. 1 (January 11, 2019): 88. http://dx.doi.org/10.3390/nano9010088.

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Rapid progress in the performance of organic devices has increased the demand for advances in the technology of thin-film permeation barriers and understanding the failure mechanisms of these material systems. Herein, we report the extensive study of mechanical and gas barrier properties of Al2O3/ZnO nanolaminate films prepared on organic substrates by atomic layer deposition (ALD). Nanolaminates of Al2O3/ZnO and single compound films of around 250 nm thickness were deposited on polyethylene terephthalate (PET) foils by ALD at 90 °C using trimethylaluminium (TMA) and diethylzinc (DEZ) as precursors and H2O as the co-reactant. STEM analysis of the nanolaminate structure revealed that steady-state film growth on PET is achieved after about 60 ALD cycles. Uniaxial tensile strain experiments revealed superior fracture and adhesive properties of single ZnO films versus the single Al2O3 film, as well as versus their nanolaminates. The superior mechanical performance of ZnO was linked to the absence of a roughly 500 to 900 nm thick sub-surface growth observed for single Al2O3 films as well as for the nanolaminates starting with an Al2O3 initial layer on PET. In contrast, the gas permeability of the nanolaminate coatings on PET was measured to be 9.4 × 10−3 O2 cm3 m−2 day−1. This is an order of magnitude less than their constituting single oxides, which opens prospects for their applications as gas barrier layers for organic electronics and food and drug packaging industries. Direct interdependency between the gas barrier and the mechanical properties was not established enabling independent tailoring of these properties for mechanically rigid and impermeable thin film coatings.

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Yonekura, Daisuke, Katsuhiro Fujikawa, and Ri-ichi Murakami. "Influence of film structure on gas barrier properties of SiOxNy films." Surface and Coatings Technology 205, no. 1 (September 2010): 168–73. http://dx.doi.org/10.1016/j.surfcoat.2010.06.024.

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35

Tonnaer, Haimo. "New synthetic organoclays offer improved flame retardancy and gas barrier properties." Plastics, Additives and Compounding 11, no. 3 (May 2009): 14–17. http://dx.doi.org/10.1016/s1464-391x(09)70077-7.

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36

Azeem, Muhammad, Rahim Jan, Sarah Farrukh, and Arshad Hussain. "Improving gas barrier properties with boron nitride nanosheets in polymer-composites." Results in Physics 12 (March 2019): 1535–41. http://dx.doi.org/10.1016/j.rinp.2019.01.057.

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37

Holden, P. S., G. A. J. Orchard, and I. M. Ward. "A study of the gas barrier properties of highly oriented polyethylene." Journal of Polymer Science: Polymer Physics Edition 23, no. 4 (April 1985): 709–31. http://dx.doi.org/10.1002/pol.1985.180230408.

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38

SA, Ahmad Ramazani, M. Shafiee, H. Abedsoltan, and A. Shafiee. "Gas barrier and mechanical properties of crosslinked ethylene vinyl acetate nanocomposites." Journal of Composite Materials 47, no. 23 (October 3, 2012): 2987–93. http://dx.doi.org/10.1177/0021998312460711.

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39

Tritschler, Ulrich, Igor Zlotnikov, Peter Fratzl, Helmut Schlaad, Simon Grüner, and Helmut Cölfen. "Gas barrier properties of bio-inspired Laponite–LC polymer hybrid films." Bioinspiration & Biomimetics 11, no. 3 (May 26, 2016): 035005. http://dx.doi.org/10.1088/1748-3190/11/3/035005.

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40

Ozeki, K., I. Nagashima, Y. Ohgoe, K. K. Hirakuri, H. Mukaibayashi, and T. Masuzawa. "Gas barrier properties of diamond-like carbon films coated on PTFE." Applied Surface Science 255, no. 16 (May 2009): 7286–90. http://dx.doi.org/10.1016/j.apsusc.2009.03.082.

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41

Zhang, Yinmin, Qinfu Liu, Shilong Zhang, Yude Zhang, and Hongfei Cheng. "Gas barrier properties and mechanism of kaolin/styrene–butadiene rubber nanocomposites." Applied Clay Science 111 (July 2015): 37–43. http://dx.doi.org/10.1016/j.clay.2015.03.001.

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42

Lizundia, Erlantz, José Luis Vilas, Ainara Sangroniz, and Agustin Etxeberria. "Light and gas barrier properties of PLLA/metallic nanoparticles composite films." European Polymer Journal 91 (June 2017): 10–20. http://dx.doi.org/10.1016/j.eurpolymj.2017.03.043.

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43

Kozakov, R., A. Sonnenfeld, J. F. Behnke, and V. Lebedev. "Investigation of the dielectric barrier discharge properties in different gas mixtures." Czechoslovak Journal of Physics 50, S3 (March 2000): 324–28. http://dx.doi.org/10.1007/bf03165905.

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44

Erdős, L., and D. Q. Tuyen. "Ergodic properties of the multidimensional rayleigh gas with a semipermeable barrier." Journal of Statistical Physics 59, no. 5-6 (June 1990): 1589–602. http://dx.doi.org/10.1007/bf01334766.

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45

Шкумбатюк, П. С. "Фотоэлектрические свойства нитевидных кристаллов ZnO." Физика и техника полупроводников 52, no. 7 (2018): 741. http://dx.doi.org/10.21883/ftp.2018.07.46045.8576.

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AbstractThe photoelectric properties of ZnO whiskers obtained from the gas phase by the evaporation of a powder and metallic Zn under the continuous action of CO_2 laser radiation are studied. On the basis of investigation of the InO–ZnO barrier structure, the mechanism of the photoconductivity of crystal ZnO caused by potential barriers is proposed.

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46

Alenezi, Mohammad R., and Abdullah M. Almeshal. "Bridging Nanowires for Enhanced Gas Sensing Properties." Crystals 11, no. 7 (June 25, 2021): 743. http://dx.doi.org/10.3390/cryst11070743.

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It is crucial to develop new bottom-up fabrication methods with control over the physical properties of the active materials to produce high-performance devices. This article reports well-controlled, without seed layer and site-selective hydrothermal method to produce ZnO bridging nanowires sensors. By controlling the growth environment, the performance of the sensor became more efficient. The presented on-chip bridging nanowire sensor enhanced sensitivity toward acetone gas (200 ppm) around 63 and fast response time (420 ms) and recovery time (900 ms). The enhancement in the speed of response and recovery is ascribed to the exceptional NW-NW junction barrier that governs the sensor’s conductivity, and the excellent contact between ZnO nanowires and Au electrodes.

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Mohd Noor, Nurul Huda, Zainuriah Hassan, and F. K. Yam. "Porous GaN for Gas Sensing Application." Advanced Materials Research 1043 (October 2014): 50–56. http://dx.doi.org/10.4028/www.scientific.net/amr.1043.50.

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Porous wide bandgap semiconductors have been widely studied in the last decade due to their unique properties compared to the bulk crystals. GaN received attention from the researchers as an ideal material to fabricate chemical sensing devices due to its excellent properties such as high thermal, mechanical and chemical stabilities, large band gap and high breakdown voltage. In this work, porous GaN was prepared by ultraviolet (UV) assisted electroless chemical etching method. The samples used in this study were commercial n-GaN grown on sapphire (Al2O3) substrates. The samples were initially cleaned in 1:20 NH4OH:H2O, followed by second cleaning in 1:50 HF:H2O and final cleaning in 3:1 HCl: HNO3and these samples were etched in HF:H2O2:CH3OH under UV illumination for 60 minutes. The structural properties was characterized using Scanning Electron Microscope (SEM). Hydrogen sensor was subsequently fabricated by depositing Pd Schottky contact onto the porous GaN sample. The effect of sensing dilute H2gas with different concentration which is 1% and 2% H2in a N2gas ambient was analyzed. The Schottky barrier height of the gas sensor samples was reduced upon exposure to gas. The porous GaN resulted better sensitivity compared to the as grown GaN sample in H2gas sensing.

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Guinault, Alain, Anh Son Nguyen, Guillaume Miquelard-Garnier, Denis Jouannet, Anne Grandmontagne, and Cyrille Sollogoub. "The Effect of Thermoforming of PLA-PHBV Films on the Morphology and Gas Barrier Properties." Key Engineering Materials 504-506 (February 2012): 1135–38. http://dx.doi.org/10.4028/www.scientific.net/kem.504-506.1135.

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Poly(lactic acid) (PLA) is a biodegradable, thermoplastic, aliphatic polyester derived from renewable resources, which is a potential candidate to replace conventional polymers in food packaging applications.. Other bio-based materials like polyhydroxyalkanoates (in our case PHBV) could be associated with PLA in order to improve its gas barrier properties and/or its mechanical properties. Two processes, classical 3 layer coextrusion and original polymer blending extrusion, have been used in this study to combine PLA and PHBV to obtain films with different PLA-PHBV structures. The aim of this paper is to compare the thermoformability of the different films and to investigate the final structure in relationship with their gas barrier properties. The effect of the thermoforming steep has been studied by separating heating and stretching effects. We show that the blend morphology offers better mechanical and barrier properties than single PLA or 3 layers PLA/PHBV films.

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Ermilova, A. I., O. B. Ushakova, and E. V. Kalugina. "The Barrier Properties of Carbon-Chain and Heterochain Polymers and Polymer Composite Materials." International Polymer Science and Technology 45, no. 2 (February 2018): 67–70. http://dx.doi.org/10.1177/0307174x1804500208.

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A comparative assessment of the gas barrier properties of polymeric materials of different chemical structure and of composites with organomodified montmorillonite based on polyamide-6 is carried out, with the aim of using them as a barrier layer for polymer hot water pipes.

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Walzl, Andrea, Samir Kopacic, Wolfgang Bauer, and Erich Leitner. "Comparison of the Functional Barrier Properties of Chitosan Acetate Films with Conventionally Applied Polymers." Molecules 25, no. 15 (July 31, 2020): 3491. http://dx.doi.org/10.3390/molecules25153491.

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The current demand to cut back on the use of plastic materials has brought a major boost to the search for bio-based alternatives. Not only are plastic bags and primary food packaging under scrutiny here, but also those materials used as functional barriers to reduce, for example, the migration of mineral oil hydrocarbons (MOH) from recycled paper and board packaging. Most of the barriers now in use are synthetic, often have only moderate barrier functionalities and in addition reduce the environmentally-friendly character of cellulose-based materials. Against this background, bio-based polymers have been evaluated in terms of their functional barrier properties. Chitosan was found to be among the best performers in these materials. In this study, the behavior of a lab-made chitosan acetate film was compared with conventionally produced polymer films. The two-sided migration experiment described recently was used to determine the barrier properties of the tested materials. This not only allowed to test the intrinsic migration of the films and the permeation through them, but also to simulate real packaging situations by using a recycled paper as donor for MOH. The migrated fractions were determined using gas-chromatography-based techniques. While the conventionally produced polymer films showed only moderate barrier function, excellent results were seen for the biopolymer. It reduced the migration from the recycled paper to not detectable, singling it out as a good alternative to conventional materials.

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Journal articles on the topic 'Gas barrier properties'

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