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polyethylene terephthalate

Sung-Ho Shin, Yang Hyeog Kwon, Young-Hwan Kim, Joo-Yun Jung, Junghyo Nah
Palladium (Pd)-based hydrogen (H₂) gas sensors have been widely investigated thanks to its fast reaction and high sensitivity to hydrogen. Various sensing mechanisms have been adopted for H₂ gas sensors; however, all the sensors must be powered through an external battery. We report here an H₂ gas sensor that can detect H₂ by measuring the output voltages generated during contact electrification between two friction surfaces. When the H₂ sensor, composed of Pd-coated ITO (indium tin oxide) and PET (polyethylene Terephthalate) film, is exposed to H₂, its output voltage is varied in proportion to H₂ concentration because the work function (WF) of Pd-coated surface changes, altering triboelectric charging behavior...
October 14, 2016: Nanomaterials
Youn Kim, Yeon Ju Kwon, Kang Eun Lee, Youngseok Oh, Moon-Kwang Um, Dong Gi Seong, Jea Uk Lee
Highly flexible and electrically-conductive multifunctional textiles are desirable for use in wearable electronic applications. In this study, we fabricated multifunctional textile composites by vacuum filtration and wet-transfer of graphene oxide films on a flexible polyethylene terephthalate (PET) textile in association with embedding Ag nanoparticles (AgNPs) to improve the electrical conductivity. A flexible organic transistor can be developed by direct transfer of a dielectric/semiconducting double layer on the graphene/AgNP textile composite, where the textile composite was used as both flexible substrate and conductive gate electrode...
August 16, 2016: Nanomaterials
Elena Canellas, Paula Vera, Cristina Nerín
Adhesives are widely used in food packaging. The suitability of an acrylic adhesive used on food packaging has been studied. Six potential migrants have been identified using GC-MS and UPLC-QTOF. Five compounds were intentionally added (2-butoxyethanol and 2,4,7,9-tetramethyl-5-decyne-4,7-diol (TMDD) and TMDD ethoxylates). Moreover, one of the compounds identified as 2-(12-(methacryloyloxy)dodecyl)malonic acid was a non-intenionally added substance (NIAS), that could be a methyl metacrylate derivative. This has demonstrated that the identification of compounds in food packaging is an essential step when the risk evaluation of the package is being studied...
March 23, 2017: Food Additives & Contaminants. Part A, Chemistry, Analysis, Control, Exposure & Risk Assessment
Manaf AlMatar, Essam A Makky
Fungi are important natural product sources that have enormous potential for the production of novel compounds for use in pharmacology, agricultural applications and industry. Compared with other natural sources such as plants, fungi are highly diverse but understudied. However, research on Cladosporium cladosporioides revealed the existence of bioactive products such as p-methylbenzoic acid, ergosterol peroxide (EP) and calphostin C as well as enzymes including pectin methylesterase (PME), polygalacturonase (PG) and chlorpyrifos hydrolase...
June 2016: 3 Biotech
K M Muhammed Shameem, Khoobaram S Choudhari, Aseefhali Bankapur, Suresh D Kulkarni, V K Unnikrishnan, Sajan D George, V B Kartha, C Santhosh
Classification of plastics is of great importance in the recycling industry as the littering of plastic wastes increases day by day as a result of its extensive use. In this paper, we demonstrate the efficacy of a combined laser-induced breakdown spectroscopy (LIBS)-Raman system for the rapid identification and classification of post-consumer plastics. The atomic information and molecular information of polyethylene terephthalate, polyethylene, polypropylene, and polystyrene were studied using plasma emission spectra and scattered signal obtained in the LIBS and Raman technique, respectively...
March 20, 2017: Analytical and Bioanalytical Chemistry
Stefanie Maaß, Daniel Daphi, Anika Lehmann, Matthias C Rillig
Plastics, despite their great benefits, have become a ubiquitous environmental pollutant, with microplastic particles having come into focus most recently. Microplastic effects have been intensely studied in aquatic, especially marine systems; however, there is lack of studies focusing on effects on soil and its biota. A basic question is if and how surface-deposited microplastic particles are transported into the soil. We here wished to test if soil microarthropods, using Collembola, can transport these particles over distances of centimeters within days in a highly controlled experimental set-up...
March 16, 2017: Environmental Pollution
Georgiy Stolyarenko, Dzhasser Doroshenko, Victor Salakhutdinov, Yuri Smetanin
PURPOSE: To present the results of research aimed at developing a new method of minimally invasive removal of an intraocular foreign body (IOFB) from the eye cavity. METHODS: The main idea was to fix the IOFB onto the edge of a laser probe, which is transsclerally injected into the eye. After that, the IOFB is fixed at the end of the laser probe and removed transpupillary from the eye through an incision in the cornea. In order to fix the IOFB on the laser probe edge, this edge should be brought closely to the IOFB surface...
March 18, 2017: European Journal of Ophthalmology
Hong Li, Jinyan Li, Jia Jiang, Fang Lv, Jiang Chang, Shiyi Chen, Chengtie Wu
To solve the poor healing of polyethylene terephthalate (PET) artificial ligament in bone tunnel, copper-containing bioactive glass (Cu-BG) nanocoatings on PET artificial ligaments were successfully prepared by pulsed laser deposition (PLD). It was hypothesized that Cu-BG coated PET (Cu-BG/PET) grafts could enhance the in vitro osteogenic and angiogenic differentiation of rat bone marrow mesenchymal stem cells (rBMSCs) and in vivo graft-bone healing after anterior cruciate ligament (ACL) reconstruction in a goat model...
March 14, 2017: Acta Biomaterialia
Lawrence J Liew, Richard M Day, Rodney J Dilley
Tissue engineering approaches using growth factors and various materials for repairing chronic perforations of the tympanic membrane are being developed, but there are surprisingly few relevant tissue culture models available to test new treatments. Here, we present a simple three-dimensional model system based on micro-dissecting the rat tympanic membrane umbo and grafting it into the membrane of a cell culture well insert. Cell outgrowth from the graft produced sufficient cells to populate a membrane of similar surface area to the human tympanic membrane within 2 weeks...
March 1, 2017: BioTechniques
Kai Zhang, Xiong Xiong, Hongjuan Hu, Chenxi Wu, Yonghong Bi, Yonghong Wu, Bingsheng Zhou, Paul K S Lam, Jiantong Liu
Microplastic pollution in inland waters is receiving growing attentions. Reservoirs are suspected to be particularly vulnerable to microplastic pollution. However, very limited information is currently available on pollution characteristics of microplastics in reservoir ecosystems. This work studied the distribution and characteristics of microplastics in the backwater area of Xiangxi River, a typical tributary of the Three Gorges Reservoir. Microplastics were detected in both surface water and sediment with concentrations ranging from 0...
March 23, 2017: Environmental Science & Technology
John M Leavitt, James M Wagner, Cuong Chi Tu, Alice Tong, Yanyi Liu, Hal S Alper
Muconic acid is a valuable platform chemical with potential applications in the production of polymers such as nylon and polyethylene terephthalate (PET). The conjugate base, muconate, was previously biosynthesized in the bacterial host Escherichia coli. Significant pathway engineering led to the first reported instance of rationally engineered production of muconic acid in the yeast Saccharomyces cerevisiae. To further increase muconic acid production in this host, we employed an adaptive laboratory evolution (ALE) strategy to complement rational metabolic engineering...
March 10, 2017: Biotechnology Journal
Seok Young Ji, Muhammed Ajmal Chathanchira, Taehun Kim, Won Seok Chang, Seunghyun Baik
There has been considerable attention in highly conductive flexible adhesive (CFA) materials as electrodes and interconnectors for future flexible electronic devices. However, the patterning technology still needs to be developed to construct micro-scale electrodes and circuits. Here we developed the selective laser sintering technology where the pattering and curing were accomplished simultaneously without making additional masks. The CFA was composed of micro-scale Ag flakes, multiwalled carbon nanotubes decorated with Ag nanoparticles, and nitrile-butadiene-rubber matrix...
March 14, 2017: Nanotechnology
Michele Mario Gutierrez, Marta Meleddu, Antonio Piga
Packaging is associated with a high environmental impact. This is also the case in the food industry despite packaging being necessary for maintaining food quality, safety assurance and preventing food waste. The aim of the present study was to identify improvements in food packaging solutions able to minimize environmental externalities while maximizing the economic sustainability. To this end, the life cycle assessment (LCA) methodology was applied to evaluate the environmental performance of new packaging solutions...
January 2017: Food Research International
R Masood, T Hussain, M Umar, Azeemullah, T Areeb, S Riaz
OBJECTIVE: The purpose of the study was the development of a suture line that has antibacterial properties and reduces the chance of wound infection thus facilitating the healing process. METHOD: Hydrolysed chitosan, turmeric powder and clove oil were used in different proportions to formulate antimicrobial coating for the polyethylene terephthalate (PET) and polyamide (Nylon 6) threads. The threads were coated using a lab-scale yarn sizing machine. Tensile, and knot strength of the coated sutures were measured...
March 2, 2017: Journal of Wound Care
Narendar Gogurla, Subhas C Kundu, Samit K Ray
Silk protein has been used as a biopolymer substrate for flexible photonic devices. Here, we demonstrate ZnO nanorod array hybrid photodetectors on Au nanoparticle-embedded silk protein for flexible optoelectronics. Hybrid samples exhibit optical absorption at the band edge of ZnO as well as plasmonic energy due to Au nanoparticles, making them attractive for selective UV and visible wavelength detection. The device prepared on Au-silk protein shows a much lower dark current and a higher photo to dark-current ratio of ∼10(5) as compared to the control sample without Au nanoparticles...
April 7, 2017: Nanotechnology
Jin-Ho Kang, Dae Kyung Jeong, Sang-Wan Ryu
A transparent and flexible piezoelectric nanogenerator (TF PNG) is demonstrated based on a GaN membrane fabricated by electrochemical lift-off. Under shear stress on the TF PNG by finger force (∼182 mN), the GaN membrane effectively undergoes normal stress and generates piezoelectric polarization along the c-axis, resulting in the generation of piezoelectric output from the TF PNG. Although the GaN layer is 315 times thinner than the flexible polyethylene terephthalate (PET) substrate, the low Young's modulus of PET allows the GaN membranes to absorb ∼41% of the applied strain energy, which leads to their large lattice deformation under extremely low applied stress...
March 16, 2017: ACS Applied Materials & Interfaces
Jiaying Wang, Satyan Choudhary, William L Harrigan, Alfred J Crosby, Kevin R Kittilstved, Stephen S Nonnenmann
Memristors, often comprising an insulating metal oxide film between two metal electrodes (MIM), constitute a class of two-terminal devices that possesses tunable variations in resistance based on the applied bias history. Intense research remains focused on the metal-insulator interface, which serves as the crux of coupled electronic-ionic interactions and dictates the underpinning transport mechanisms at either electrode. Top-down, ultrahigh-vacuum (UVH) deposition approaches for MIM nanostructures yield highly crystalline, heteroepitaxial interfaces but limit the number of electrode configurations due to a fixed bottom electrode...
March 16, 2017: ACS Applied Materials & Interfaces
Lizette Utomo, Geesien S A Boersema, Yves Bayon, Johan F Lange, Gerjo J V M van Osch, Yvonne M Bastiaansen-Jenniskens
After implantation of a biomaterial, an inflammatory response involving macrophages is induced. The behavior of macrophages depends on their phenotype, and by directing macrophage polarization unwanted effects may be avoided. In this study, the possibility to modulate the behavior of macrophages activated by biomaterials was assessed in an in vitro model. Primary human monocytes were seeded on polyethylene terephthalate, polypropylene and polylactic acid yarns, and treated with medications frequently used by patients: rapamycin, dexamethasone, celecoxib or pravastatin...
March 7, 2017: Biomedical Materials
Md Abul Kalam Azad, Tobias Krause, Leon Danter, Albert Baars, Kerstin Koch, Wilhelm Barthlott
Fog collecting meshes show a great potential to ensure the availability of a supply of sustainable fresh water in certain arid regions. In most cases, the meshes are made of hydrophilic smooth fibers. Based on the study of plant surfaces, we analyzed the fog-collection of different polyethylene terephthalate (PET) fibers with different cross-sections and different surface structures with the aim of developing optimized biomimetic fog collectors. Water droplet movement and the onset of dripping from fiber samples were compared...
March 5, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
Takeshi Kawabata, Masayuki Oda, Fusako Kawai
The cutinase-like enzyme, Cut190, from Saccharomonospora viridis AHK190 can degrade the inner block of polyethylene terephthalate (PET) in the presence of Ca(2+), and its mutant, S226P/R228S, exhibited increased activity and higher thermostability. The crystal structures of the Cut190 S226P mutant in the absence and presence of Ca(2+) were determined, and revealed the large conformational change induced upon Ca(2+) binding. However, the substrate-bound 3D structures of Cut190 remained unknown. In this study, to determine the substrate-binding site and improve the enzyme activity, we first built 3D structures of a PET model compound bound to the crystal structures, using the distance restraints between the scissile carbonyl group of the compound and the catalytic site of the enzyme...
March 1, 2017: Journal of Bioscience and Bioengineering
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