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polyethylene terephthalate

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https://www.readbyqxmd.com/read/29448735/fabrication-of-up-conversion-phosphor-films-on-flexible-substrates-using-a-nanostructured-organo-silicon
#1
Young-Sun Jeon, Tae-Un Kim, Seon-Hoon Kim, Young-Hwan Lee, Pil-Son Choi, Kyu-Seog Hwang
Up-conversion phosphors have attracted considerable attention because of their applications in solid-state lasers, optical communications, flat-panel displays, photovoltaic cells, and biological labels. Among them, NaYF4 is reported as one of the most efficient hosts for infrared to visible photon up-conversion of Yb3+ and Er3+ ions. However, a low-temperature method is required for industrial scale fabrication of photonic and optoelectronic devices on flexible organic substrates. In this study, hexagonal β-NaYF4: 3 mol% Yb3+, 3 mol% Er3+ up-conversion phosphor using Ca2+ was prepared by chemical solution method...
March 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29444994/life-cycle-assessment-of-cleanroom-coveralls-reusable-and-disposable
#2
Eric Vozzola, Michael Overcash, Evan Griffing
Cleanroom garments serve a critical role in such industries as pharmaceuticals, life sciences, and semiconductor manufacturing. These textiles are available in reusable and disposable alternatives. In this report, the environmental sustainability of cleanroom coveralls is examined using life cycle assessment technology. The complete supply chain, manufacture, use, and end-of-life phases for reusable and disposable cleanroom coveralls are compared on a cradle-to-end-of-life cycle basis. Three industry representative coveralls are examined: a reusable woven polyethylene terephthalate (PET) coverall, a disposable flash spunbonded high density polyethylene (HDPE) coverall, and a disposable spunbond-meltblown-spunbond polypropylene (SMS PP) coverall...
February 14, 2018: PDA Journal of Pharmaceutical Science and Technology
https://www.readbyqxmd.com/read/29444315/measurement-of-internal-radiation-dose-distribution-in-ct-examinations-using-polyethylene-terephthalate-resin
#3
C Yamauchi-Kawaura, S Yamamoto, K Fujii, M Komori, M Yamauchi, N Ohzawa, M Kozuka, N Suga, N Ito, A Fukuyama
This study proposes a new dosimetry method for the estimation of the internal radiation dose distribution of a subject undergoing computed tomography (CT) examinations. In this novel method, dose distribution of a subject by CT scans was estimated based on radiophotoluminance distribution with polyethylene terephthalate (PET) resin which was cut to the average head size of a Japanese 1-year-old child. The difference in dose distribution depending on the type of bowtie filter was visualized by imaging luminance distribution with the PET phantom using a charge-coupled device camera...
February 12, 2018: Radiation Protection Dosimetry
https://www.readbyqxmd.com/read/29444103/macro-and-micro-plastics-sorb-and-desorb-metals-and-act-as-a-point-source-of-trace-metals-to-coastal-ecosystems
#4
B Munier, L I Bendell
Nine urban intertidal regions in Burrard Inlet, Vancouver, British Columbia, Canada, were sampled for plastic debris. Debris included macro and micro plastics and originated from a wide diversity of uses ranging from personal hygiene to solar cells. Debris was characterized for its polymer through standard physiochemical characteristics, then subject to a weak acid extraction to remove the metals, zinc, copper, cadmium and lead from the polymer. Recently manufactured low density polyethylene (LDPE), nylon, polyethylene terephthalate (PET), polypropylene (PP), polystyrene (PS) and polyvinyl chloride (PVC) were subject to the same extraction...
2018: PloS One
https://www.readbyqxmd.com/read/29442784/hot-roll-pressing-mediated-transfer-of-chemical-vapor-deposition-graphene-for-transparent-and-flexible-touch-screen-with-low-sheet-resistance
#5
Chengkun Guo, Xianghua Kong, Hengxing Ji
Obstacles associated with graphene as transparent conductive films mainly consist of the difficulties in high-quality graphene synthesis, efficient transfer and doping of samples with lateral size of tens of centimeters for practical applications. Herein we demonstrate a hot-roll-pressing transfer technique followed by wet-chemical doping of large area graphene film grown on copper foil by chemical vapor deposition (CVD). This method enabled cost-effective and ultraclean transfer of single-layer graphene with an arbitrary size onto transparent ethylene vinyl acetate/polyethylene terephthalate (EVA/PET) substrate without any polymer residues...
June 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29439511/comparison-of-ultem-9085-used-in-fused-deposition-modelling-fdm-with-polytherimide-blends
#6
Gianluca Cicala, Giulia Ognibene, Salvatore Portuesi, Ignazio Blanco, Mario Rapisarda, Eugenio Pergolizzi, Giuseppe Recca
Polyetherimide (PEI) blends modified by either polycarbonate (PC) or polyethylene terephthalate glycol-modified (PETG) were prepared. The latter modifier (PETG) was an industrial grade widely used for fused deposition modelling (FDM) printing. PEI blends were compared to Ultem 9085, which is the standard PEI grade for FDM printing in advanced applications. All the blends were thoroughly characterized in terms of their rheological, morphological, thermomechanical and tensile properties. Ultem 9085 showed improved rheology for processing over standard PEI...
February 12, 2018: Materials
https://www.readbyqxmd.com/read/29428989/determination-of-oligomers-in-virgin-and-recycled-polyethylene-terephthalate-pet-samples-by-uplc-ms-qtof
#7
Sara Ubeda, Margarita Aznar, Cristina Nerín
An oligomer is a molecule that consists of a few monomer units. It can be formed during polymer manufacturing and also due to polymer degradation processes or even during use conditions. Since oligomers are not included in chemical databases, their identification is a complex process. In this work, the oligomers present in 20 different PET pellet samples have been determined. Two different sample treatment procedures, solvent extraction and total dissolution, were applied in order to select the most efficient one...
February 10, 2018: Analytical and Bioanalytical Chemistry
https://www.readbyqxmd.com/read/29427944/antimicrobial-coatings-on-polyethylene-terephthalate-based-on-curcumin-cyclodextrin-complex-embedded-in-a-multilayer-polyelectrolyte-architecture
#8
Ilya Shlar, Samir Droby, Victor Rodov
Bacterial contamination is a growing concern worldwide. The aim of this work was to develop an antimicrobial coating based on curcumin-cyclodextrin inclusion complex and using polyethylene terephthalate (PET) film as a support matrix. After a pre-treatment aimed to provide sufficient electric charge to the PET surface, it was electrostatically coated with repeated multilayers comprising alternately deposited positively-charged poly-l-lysine (PLL) and negatively-charged poly-l-glutamic acid (PLGA) and carboxymethyl-β-cyclodextrin (CMBCD)...
February 5, 2018: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/29427431/new-insights-into-the-function-and-global-distribution-of-polyethylene-terephthalate-pet-degrading-bacteria-and-enzymes-in-marine-and-terrestrial-metagenomes
#9
Dominik Danso, Christel Schmeisser, Jennifer Chow, Wolfgang Zimmermann, Ren Wei, Christian Leggewie, Xiangzhen Li, Terry Hazen, Wolfgang R Streit
Polyethylene terephthalate (PET) is one of the most important synthetic polymers used nowadays. Unfortunately, the polymers accumulate in nature and until now, no highly active enzymes are known that can degrade it at high velocity. Enzymes involved in PET degradation are mainly α/β-hydrolases like cutinases and related enzymes (E.C. 3.1.-). Currently, only a small number of such enzymes are well characterized. Within this work, a search algorithm was developed that identified 504 possible PET hydrolase candidate genes from various databases...
February 2, 2018: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/29426842/molecular-channel-driven-actuator-with-considerations-for-multiple-configurations-and-color-switching
#10
Jiuke Mu, Gang Wang, Hongping Yan, Huayu Li, Xuemin Wang, Enlai Gao, Chengyi Hou, Anh Thi Cam Pham, Lianjun Wu, Qinghong Zhang, Yaogang Li, Zhiping Xu, Yang Guo, Elsa Reichmanis, Hongzhi Wang, Meifang Zhu
The ability to achieve simultaneous intrinsic deformation with fast response in commercially available materials that can safely contact skin continues to be an unresolved challenge for artificial actuating materials. Rather than using a microporous structure, here we show an ambient-driven actuator that takes advantage of inherent nanoscale molecular channels within a commercial perfluorosulfonic acid ionomer (PFSA) film, fabricated by simple solution processing to realize a rapid response, self-adaptive, and exceptionally stable actuation...
February 9, 2018: Nature Communications
https://www.readbyqxmd.com/read/29422511/ultrafast-ion-sieving-using-nanoporous-polymeric-membranes
#11
Pengfei Wang, Mao Wang, Feng Liu, Siyuan Ding, Xue Wang, Guanghua Du, Jie Liu, Pavel Apel, Patrick Kluth, Christina Trautmann, Yugang Wang
The great potential of nanoporous membranes for water filtration and chemical separation has been challenged by the trade-off between selectivity and permeability. Here we report on nanoporous polymer membranes with an excellent balance between selectivity and permeability of ions. Our membranes are fabricated by irradiating 2-μm-thick polyethylene terephthalate Lumirror® films with GeV heavy ions followed by ultraviolet exposure. These membranes show a high transport rate of K+ ions of up to 14 mol h-1 m-2 and a selectivity of alkali metal ions over heavy metal ions of >500...
February 8, 2018: Nature Communications
https://www.readbyqxmd.com/read/29414341/comparisons-of-microplastic-pollution-between-mudflats-and-sandy-beaches-in-hong-kong
#12
Hoi-Shing Lo, Xiaoyu Xu, Chun-Yuen Wong, Siu-Gin Cheung
Most of the previous studies of microplastic pollution on coastal habitats focused on high energy beaches although low energy areas such as mudflats are supposed to retain more microplastics, not to mention that mudflats are biologically more diverse. We quantified and characterized microplastics from 10 mudflats and 10 sandy beaches in Hong Kong spanning from the eastern to western waters. Sediment samples were collected at 1.0 m and 1.5 m above chart datum (CD) and at the strandline. Abundance of microplastics ranged between 0...
January 30, 2018: Environmental Pollution
https://www.readbyqxmd.com/read/29411848/highly-durable-cu-based-electrodes-from-a-printable-nanoparticle-mixture-ink-flash-light-sintered-kinetically-controlled-microstructure
#13
Hye Jin Park, Yejin Jo, Min Kyung Cho, Jeong Young Woo, Dojin Kim, Su Yeon Lee, Youngmin Choi, Sunho Jeong
Recently, printable nanomaterials have drawn tremendous attention for low-cost, large-area electronics applications. In particular, metallic nanoparticles that can facilitate the formation of highly functioning electrodes are indispensable constituent nanomaterials. In this paper, we propose printable mixed inks comprising multicomponent ingredients of Cu, Ni and Cu/Cu10Sn3 core/shell nanoparticles. It is clearly revealed that a characteristic morphology appropriate to highly conductive and durable Cu-based electrodes can be derived easily in a timescale of about 1 ms through an instantaneous flash-light-sintering process, resulting in a resistivity of 49 μΩ cm and normalized resistance variation of around 1 (after 28 days under a harsh environment of 85 °C temperature and 85% humidity)...
February 7, 2018: Nanoscale
https://www.readbyqxmd.com/read/29408106/sustainable-and-long-time-rejuvenation-of-biomimetic-water-repellent-silica-coating-on-polyester-fabrics-induced-by-rough-mechanical-abrasion
#14
Cornelia Rosu, Haisheng Lin, Lu Jiang, Victor Breedveld, Dennis W Hess
The economical use of water-repellent coatings on polymeric materials in commercial and industrial applications is limited by their mechanical wear robustness and long-term durability. In this study, we demonstrate that polyethylene terephthalate (PET) fabric modified with inorganic, methyltrimethoxysilane (MTMS)-based coatings shows excellent resistance against various types of wear damage, thereby mimicking superhydrophobic biological materials. These features were facilitated by the rational design of coating processing that also enabled tunable hierarchical surface structure...
January 23, 2018: Journal of Colloid and Interface Science
https://www.readbyqxmd.com/read/29407927/feasibility-of-biodegradable-based-packaging-used-for-red-meat-storage-during-shelf-life-a-pilot-study
#15
S Panseri, P A Martino, P Cagnardi, G Celano, D Tedesco, M Castrica, C Balzaretti, L M Chiesa
This study was designated to ascertain the effectiveness of polylactic acid (PLA) based packaging solution to store red fresh meat during its refrigerated shelf-life. Recently the attention in the packaging industry regarding the use of bioplastics has been shifting from compostable/biodegradable materials toward biobased materials. Steaks obtained from semimembranous muscle of Piemontese beef were packaged in PLA trays closed with a lid made of PLA film and for comparison purposed in a conventional reference package consisting of a amorphous polyethylene terephthalate/polyethylene (APET/PET) trays and wrapped in plastic film of polyvinyl chloride (PVC)...
May 30, 2018: Food Chemistry
https://www.readbyqxmd.com/read/29405055/culture-free-detection-of-bacterial-pathogens-on-plasmonic-nanopillar-arrays-using-rapid-raman-mapping
#16
Juhui Ko, Sung-Gyu Park, Sangyeop Lee, Xiaokun Wang, ChaeWon Mun, Sunho Kim, Dong-Ho Kim, Jaebum Choo
We utilized a fast Raman spectral mapping technique for fast detection of bacterial pathogens. Three-dimensional (3D) plasmonic nanopillar arrays were fabricated using the nanolithography-free process consisting of maskless Ar plasma treatment of a polyethylene terephthalate (PET) substrate and subsequent metal deposition. Bacterial pathogens were immobilized on the positively charged poly(L-lysine) (PLL)-coated 3D plasmonic substrate through electrostatic interactions. Then the bacterial surfaces were selectively labeled with antibody-conjugated surface-enhanced Raman scattering (SERS) nanotags, and Raman mapping images were collected and statistically analyzed for quantitative analysis of bacteria...
February 6, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29401904/inkjet-printed-perovskite-distributed-feedback-lasers
#17
Florian Mathies, Philipp Brenner, Gerardo Hernandez-Sosa, Ian A Howard, Ulrich W Paetzold, Uli Lemmer
We report on digitally printed distributed feedback lasers on flexible polyethylene terephthalate substrates based on methylammonium lead iodide perovskite gain material. The perovskite lasers are printed with a digital drop-on-demand inkjet printer, providing full freedom in the shape and design of the gain layer. We show that adjusting the perovskite ink increases the potential processing window and decreases the surface roughness of the active layer to less than 7 nm, which is essential for low lasing thresholds...
January 22, 2018: Optics Express
https://www.readbyqxmd.com/read/29399133/investigation-into-the-optimal-prosthetic-material-for-wound-healing-of-abdominal-wall-defects
#18
Adem Akcakaya, Ibrahim Aydogdu, Bulent Citgez
The purpose of this experimental study is to investigate and compare the effects of prosthetic materials used for wound healing of abdominal wall hernias. A total of 60 rats were divided into five equal groups: Group I, control subjected to laparotomy; group II, abdominal wall defect 3×2 cm+polypropylene (PP) mesh; group III, abdominal wall defect 3×2 cm+PP mesh+hyaluronate and carboxymethylcellulose (H-CMC; Seprafilm®); group IV, abdominal wall defect 3×2 cm+polytetrafluoroethylene (PTFE; Composix™); and group V, abdominal wall defect 3×2 cm+polyethylene terephthalate (PET; Dacron®)...
February 2018: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/29382816/a-carbon-nanotube-tape-for-serial-section-electron-microscopy-of-brain-ultrastructure
#19
Yoshiyuki Kubota, Jaerin Sohn, Sayuri Hatada, Meike Schurr, Jakob Straehle, Anjali Gour, Ralph Neujahr, Takafumi Miki, Shawn Mikula, Yasuo Kawaguchi
Automated tape-collecting ultramicrotomy in conjunction with scanning electron microscopy (SEM) is a powerful approach for volume electron microscopy and three-dimensional neuronal circuit analysis. Current tapes are limited by section wrinkle formation, surface scratches and sample charging during imaging. Here we show that a plasma-hydrophilized carbon nanotube (CNT)-coated polyethylene terephthalate (PET) tape effectively resolves these issues and produces SEM images of comparable quality to those from transmission electron microscopy...
January 30, 2018: Nature Communications
https://www.readbyqxmd.com/read/29372184/toward-biomass-derived-renewable-plastics-production-of-2-5-furandicarboxylic-acid-from-fructose
#20
Ali Hussain Motagamwala, Wangyun Won, Canan Sener, David Martin Alonso, Christos T Maravelias, James A Dumesic
We report a process for converting fructose, at a high concentration (15 weight %), to 2,5-furandicarboxylic acid (FDCA), a monomer used in the production of polyethylene furanoate, a renewable plastic. In our process, fructose is dehydrated to hydroxymethylfurfural (HMF) at high yields (70%) using a γ-valerolactone (GVL)/H2O solvent system. HMF is subsequently oxidized to FDCA over a Pt/C catalyst with 93% yield. The advantage of our system is the higher solubility of FDCA in GVL/H2O, which allows oxidation at high concentrations using a heterogeneous catalyst that eliminates the need for a homogeneous base...
January 2018: Science Advances
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