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polyethylene terephthalate

Yijie Zhou, Aibin Huang, Huaijuan Zhou, Shidong Ji, Ping Jin
Research on functional flexible films has been attracting widespread attention especially those foils which could be designed artificially on the base of the practical requirements. In this work, foil with high visible reflection and strong near infrared shielding efficiency was prepared by simple wet chemical methods. In the process of making this kind of optical foil, emulsion polymerization was first introduced to synthesize polymer opals which were further compressed between two pieces of polyethylene terephthalate (PET) foils under polymer melting temperature to obtain photonic crystal film with strong reflection in visible region to block blue ray...
December 8, 2017: Nanotechnology
Jakub Krajniak, Zidan Zhang, Sudharsan Pandiyan, Eric Nies, Giovanni Samaey
We present a comprehensive approach for reverse mapping of complex polymer systems in which the connectivity is created by the simulation of chemical reactions at the coarse-grained scale. Within the work, we use a recently developed generic adaptive reverse mapping procedure that we adapt to handle the varying connectivity structure resulting from the chemical reactions. The method is independent of the coarse-grained and fine-grained force-fields by design and relies only on a single control parameter. We employ the approach to reverse map four different systems: a three-component epoxy network, a trimethylol melamine network, a hyperbranched polymer, and a polyethylene terephthalate...
December 6, 2017: Journal of Computational Chemistry
Ping Li, Xiaoqiu Dou, Chuanliang Feng, Holger Schönherr
Herein, fabrication and modification of novel bio-inspired microwell arrays with nanoscale topographic structures are reported. The natural nano- and microstructures present on the surface of rose petals were hypothesized to enhance cell-surface contacts. Thus hierarchically structured polyethylene terephthalate glycol modified (PETG) substrates were fabricated by replication from rose petals via nanoimprint lithography, followed by covalent modification and crosslinking with RGD-presenting gelatin-methacrylate (GelMA) for promoting cell adhesion and spreading...
December 6, 2017: Biomaterials Science
Mehmet Gürdal, Özlem Barut Selver, Kemal Baysal, İsmet Durak
In this study, we aimed to compare the effects of six different cell culture media and autologous serum (AS) on the phenotypic characteristics of rabbit limbal epithelial stem cells (LESC) cultivated on porous polyethylene terephthalate (PET) membranes. Limbal explants from rabbit corneas were grown on PET membrane inserts in five different media: DMEM-F12 with fetal bovine serum (FBS) (DMEM-F12-FBS), with pluripotin (DMEM-F12-pluripotin) and with autologous serum (DMEM-F12-AS), Epilife, Keratinocyte Serum Free Medium (KSFM) and Defined-Keratinocyte Serum Free Medium...
December 4, 2017: Cytotechnology
Assar Ali Shah, Yuan Xianjun, Dong Zhihao, Li Junfeng, Tao Shao
The aim of the present study was isolation and molecular identification of lactic acid bacteria from King grass and their application to improve the fermentation quality of sweet Sorghum. Seventy-six strains of LAB were isolated; five strains were selected for Physiological and morphological tests and 16S rRNA sequencing. All five strains grew at different pH 3.5-8.0, different temperature 35, 40, 45, 50 °C and different NaCl concentrations 3, 6.5, 9.5%. Strains HDASK were identified Lactobacillus plantarum and SK3907, SK2A32, SK3A42 and ASKDD Pediococcus acidilactici...
December 4, 2017: World Journal of Microbiology & Biotechnology
Jivago Serrado Nunes, Nelson Castro, Sergio Gonçalves, Nélson Pereira, Vitor Correia, Senentxu Lanceros-Mendez
The market for interactive platforms is rapidly growing, and touchscreens have been incorporated in an increasing number of devices. Thus, the area of smart objects and devices is strongly increasing by adding interactive touch and multimedia content, leading to new uses and capabilities. In this work, a flexible screen printed sensor matrix is fabricated based on silver ink in a polyethylene terephthalate (PET) substrate. Diamond shaped capacitive electrodes coupled with conventional capacitive reading electronics enables fabrication of a highly functional capacitive touchpad, and also allows for the identification of marked objects...
December 1, 2017: Sensors
Hye Jin Park, Min Kyung Cho, Young Woo Jeong, Dojin Kim, Su Yeon Lee, Youngmin Choi, Sunho Jeong
In recent years, highly conductive, printable electrodes have received tremendous attention in various research fields as the most important constituent components for large-area, low-cost electronics. In terms of an indispensable sintering process for generating electrodes from printable metallic nanomaterials, a flash-light-based sintering technique has been regarded as a viable approach for continuous roll-to-roll processes. In this paper, to satisfy these requisites in both material and process, we report cost-effective, printable Cu electrodes that can be applied to vulnerable polyethylene terephthalate (PET) substrates, by incorporating a heretofore-unrecognized ultrathin plasmonic thermal/optical barrier, which is composed of a 30 nm-thick Ag nanoparticle layer...
November 28, 2017: ACS Applied Materials & Interfaces
S D’Adamio, G Cazzato, A Ziranu, A Sgambato, M A Rosa, G Maccauro
A reliable and effective technique in case of limb salvage surgery after resection of extensive bone tumors is represented by the implant of modular or custom-made megaprosthesis. Fixation of the residual surrounding soft tissue on the implant represent a challenge for the surgeon and the use of a polyethylene terephthalate (PET) tube over it, also known as Trevira, is currently a common choice for reattachment with good clinical outcomes. We compared fibroblastic cell culture potential over simple titanium coating vs titanium surrounded by Trevira and evaluated cell viability and replication at 24, 48 and 72 h using MTT cell growth assay and scanning electron microscopy to determine if there was any difference in the potential of cell growth associated to the material used...
October 2017: Journal of Biological Regulators and Homeostatic Agents
Marianne Gunell, Janne Haapanen, Kofi J Brobbey, Jarkko J Saarinen, Martti Toivakka, Jyrki M Mäkelä, Pentti Huovinen, Erkki Eerola
Bacterial infections, especially by antimicrobial resistant (AMR) bacteria, are an increasing problem worldwide. AMR is especially a problem with health care-associated infections due to bacteria in hospital environments being easily transferred from patient to patient and from patient to environment, and thus, solutions to prevent bacterial transmission are needed. Hand washing is an effective tool for preventing bacterial infections, but other approaches such as nanoparticle-coated surfaces are also needed...
2017: Nanotechnology, Science and Applications
Premanjali Rai, Kunwar P Singh
Waste Polyethylene terephthalate (PET) bottles were pyrolyzed in the presence of nitrogen and converted into activated carbon (PETAC) by physical activation in carbon dioxide flow. An ex-situ precipitation and external reduction method were applied for the intercalation of ferromagnetic iron oxides onto the PETAC matrix. The characteristic structural and chemical properties of PETAC and magnetic PETAC (M-PETAC) were studied by Brunauer Emmett Teller (BET) surface area analysis, Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), Fourier Transform Infrared (FTIR) analysis, Raman spectroscopy, X-Ray Diffraction (XRD) analysis, Energy Dispersive analysis of X-rays (EDAX), Vibrating Sample Magnetometer (VSM), Thermal gravimetric analysis (TGA) and elemental analysis...
November 24, 2017: Journal of Environmental Management
Jian Sun, Dajiang Liu, Robert P Young, Alejandro G Cruz, Nancy G Isern, Timo Schuerg, John R Cort, Blake A Simmons, Seema Singh
High loading solubilization and efficient upgrading polyethylene terephthalate (PET) is of significant importance but challenging and most solvents for PET are highly toxic. In this work, we demonstrate for the first time that a low cost (~$1.2/kg) and biocompatible ionic liquid (IL), cholinium phosphate ([Ch]3[PO4]) can play bifunctional roles in PET solubilization and glycolytic degradation. High loading of PET (10 wt%) is readily dissolved in [Ch]3[PO4] at relatively low temperatures (120 °C, 3h) and even in water-rich conditions...
November 27, 2017: ChemSusChem
Josiane Valéria Bison, Poliana Cardoso-Gustavson, Regina Maria de Moraes, Giselle da Silva Pedrosa, Luciano Soares Cruz, Luciano Freschi, Silvia Ribeiro de Souza
The emission profile of volatile organic compounds (VOCs) and nitric oxide (NO) in young and mature leaves of Croton floribundus was assessed in plants exposed to filtered air (FA) and ozone-enriched filtered air (FA+O3). After the period of exposure, leaves were enclosed in polyethylene terephthalate bags and VOCs were collected in young and mature leaves. Both young and mature leaves constitutively emitted the same VOC, but the concentrations were higher in young leaves. O3 exposure induced the emission of sesquiterpenes (mainly β-caryophyllene) known as antioxidant compounds that may scavenge O3...
November 25, 2017: Environmental Science and Pollution Research International
Annkatrin Weber, Christian Scherer, Nicole Brennholt, Georg Reifferscheid, Martin Wagner
Over the past decade, microscopic plastic debris, known as microplastics, emerged as a contaminant of concern in marine and freshwater ecosystems. Although regularly detected in aquatic environments, the toxicity of those synthetic particles is not well understood. To address this, we investigated whether the exposure to microplastics adversely affects the amphipod Gammarus pulex, a key freshwater invertebrate. Juvenile (6-9 mm) and adult (12-17 mm) individuals were exposed to irregular, fluorescent polyethylene terephthalate fragments (PET, 10-150 μm; 0...
November 23, 2017: Environmental Pollution
Sarah M Hertrich, Glenn Boyd, Joseph Sites, Brendan A Niemira
Customer demand for convenient food products has led to an increased production of prepackaged and ready-to-eat food products. Most of these products rely mainly on surface disinfection and other traditional approaches to ensure shelf life and safety. Novel processing techniques, such as cold plasma, are currently being investigated to enhance the safety and shelf life of prepacked foods. The purpose of this study was to determine the effects of cold plasma corona discharge on the inactivation of Salmonella on prepackaged, tomato-and-lettuce mixed salads...
November 22, 2017: Journal of Food Protection
Jonathan L Eliason, Dawn M Coleman, Adam Gumushian, James C Stanley
OBJECTIVE: Chronic lower extremity ischemia in pediatric patients is uncommon. The intent of this study was to better define the arterial reconstructive options and their long-term durability in preadolescent and adolescent children having clinically relevant arterial occlusions affecting the lower extremity. METHODS: The medical records of 33 consecutive pediatric patients who underwent lower extremity revascularization for chronic ischemia at the University of Michigan from 1974 to 2016 were reviewed...
November 18, 2017: Journal of Vascular Surgery
Artur I Milnerowicz, Aleksandra A Milnerowicz, Marcin Protasiewicz, Wiktor Kuliczkowski
BACKGROUND: Effectiveness of vascular closure devices during endovascular procedures requiring a direct puncture of a vascular prosthesis placed in the inguinal region is unknown. PATIENTS AND METHODS: The retrospective analysis included 134 patients with a history of polyethylene terephthalate (PETE) graft implantation in the inguinal region. In 20 (15 %) patients, haemostasis was achieved with manual compression, in 21 (16 %) with the StarClose™, and in 93 (69 %) with the AngioSeal™ device...
November 21, 2017: VASA. Zeitschrift Für Gefässkrankheiten
Alexandra Ter Halle, Laurent Jeanneau, Marion Martignac, Emilie Jardé, Boris Pedrono, Laurent Brach, Julien Gigault
Plastics can be found in all ecosystems across the globe. This type of environmental pollution is important, even if its impact is not fully understood. The presence of small plastic particles at the micro- and nanoscales is of growing concern, but nanoplastic has not yet been observed in natural samples. In this study, we examined four size fractions (meso-, large micro-, small micro-, and nanoplastics) of debris collected in the North Atlantic subtropical gyre. To obtain the nanoplastic portion, we isolated the colloidal fraction of seawater...
November 21, 2017: Environmental Science & Technology
Richard O'Donoghue, Julian Rechmann, Morteza Aghaee, Detlef Rogalla, Hans-Werner Becker, Mariadriana Creatore, Andreas Dirk Wieck, Anjana Devi
Herein we describe an efficient low temperature (60-160 °C) plasma enhanced atomic layer deposition (PEALD) process for gallium oxide (Ga2O3) thin films using hexakis(dimethylamido)digallium [Ga(NMe2)3]2 with oxygen (O2) plasma on Si(100). The use of O2 plasma was found to have a significant improvement on the growth rate and deposition temperature when compared to former Ga2O3 processes. The process yielded the second highest growth rates (1.5 Å per cycle) in terms of Ga2O3 ALD and the lowest temperature to date for the ALD growth of Ga2O3 and typical ALD characteristics were determined...
November 21, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
Lorena Martín-Olivera, Dmitry G Shchukin, Gilberto Teobaldi
Magnetic hardening and generation of room-temperature ferromagnetism at the interface between originally nonmagnetic transition metals and π-conjugated organics is understood to be promoted by interplay between interfacial charge transfer and relaxation-induced distortion of the metal lattice. The relative importance of the two contributions for magnetic hardening of the metal remains unquantified. Here, we disentangle their role via density functional theory simulation of several models of interfaces between Cu and polymers of different steric hindrance, π-conjugation, and electron-accepting properties: polyethylene, polyacetylene, polyethylene terephthalate, and polyurethane...
October 26, 2017: Journal of Physical Chemistry. C, Nanomaterials and Interfaces
Darena Schymanski, Christophe Goldbeck, Hans-Ulrich Humpf, Peter Fürst
Microplastics are anthropogenic contaminants which have been found in oceans, lakes and rivers. Investigations focusing on drinking water are rare and studies have mainly been using micro-Fourier Transform Infrared Spectroscopy (μ-FT-IR). A major limitation of this technique is its inability to detect particles smaller than 20 μm. However, micro-Raman spectroscopy is capable of detecting even smaller particle sizes. Therefore, we show that this technique, which was used in this study, is particularly useful in detecting microplastics in drinking water where particle sizes are in the low micrometer range...
November 6, 2017: Water Research
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