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polyethylene terephthalate

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https://www.readbyqxmd.com/read/28208243/direct-determination-of-ascorbic-acid-in-a-grapefruit-paving-the-way-for-in-vivo-spectroelectrochemistry
#1
Jesus Garoz-Ruiz, Aranzazu Heras, Alvaro Colina
The study of real samples is more complicated than the study of other systems. However, the inherent advantages of UV-vis absorption spectroelectrochemistry should overcome some difficulties related to direct measurements in complex matrices. For this reason, a singular spectroelectrochemistry device has been fabricated and validated. The novel cell is based on single-walled carbon nanotubes, which are filtered and subsequently press-transferred on a polyethylene terephthalate support using a stencil with a custom design...
February 7, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28202280/pollutant-content-in-marine-debris-and-characterization-by-thermal-decomposition
#2
M E Iñiguez, J A Conesa, A Fullana
Marine debris (MDs) produces a wide variety of negative environmental, economic, safety, health and cultural impacts. Most marine litter has a very low decomposition rate (plastics), leading to a gradual accumulation in the coastal and marine environment. Characterization of the MDs has been done in terms of their pollutant content: PAHs, ClBzs, ClPhs, BrPhs, PCDD/Fs and PCBs. The results show that MDs is not a very contaminated waste. Also, thermal decomposition of MDs materials has been studied in a thermobalance at different atmospheres and heating rates...
February 12, 2017: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/28201959/differentiation-potential-of-mesenchymal-stem-cells-derived-from-adipose-tissue-vs-bone-marrow-toward-annulus-fibrosus-cells-in-vitro
#3
Yifei Zhou, Xuqi Hu, Xuhao Zheng, Yaosen Wu, Naifeng Tian, Huazi Xu, Xiaolei Zhang
This study was to compare differentiation potential of bone marrow stem cells (BMSCs) and adipose-derived stem cells (ADSCs) from Sprague-Dawley rats towards annulus fibrosus (AF)-like cells. Using coculture plates with 0.4μm pore size polyethylene terephthalate (PET) track-etched inserts (Corning,USA), MSCs and AF cells were cocultured with direct cell-to-cell contact up till 21 days. We evaluated the AF markers expression at the histological level and molecular level. Quantitative reverse-transcription polymerase chain reaction (qRT-PCR) results showed up regulation in AF marker gene expressions of both two MSCs after coculture...
February 13, 2017: Current Stem Cell Research & Therapy
https://www.readbyqxmd.com/read/28190576/field-portable-xrf-reveals-the-ubiquity-of-antimony-in-plastic-consumer-products
#4
Andrew Turner, Montserrat Filella
Very little systematic information exists on the occurrence and concentrations of antimony (Sb) in consumer products. In this study, a Niton XL3t field-portable-X-ray fluorescence (FP-XRF) spectrometer was deployed in situ and in the laboratory to provide quantitative information on Sb dissipated in plastic items and fixtures (including rubber, textile and foamed materials) from the domestic, school, vehicular and office settings. The metalloid was detected in 18% of over 800 measurements performed, with concentrations ranging from about 60 to 60,000μgg(-1)...
February 9, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/28166643/study-of-the-influence-of-storage-conditions-on-the-quality-and-migration-levels-of-antimony-in-polyethylene-terephthalate-bottled-water
#5
Luis Payán, M Teresa Poyatos, Lucía Muñoz, M Dolores La Rubia, Rafael Pacheco, Natividad Ramos
The main objectives of this study are to determine the presence of antimony in water stored in polyethylene terephthalate bottles and the influence of temperature and time over the migration levels. For this purpose, Sb determination was carried out in water at different experimental conditions: storage for one to three weeks at 25 to 80 ℃; long-term (six months) storage at room temperature between 16 and 24 ℃ and storage in car during summer which is a common consumer's habit. In addition, water quality analysis was developed after different time-temperature storage conditions...
January 1, 2017: Food Science and Technology International, Ciencia y Tecnología de Los Alimentos Internacional
https://www.readbyqxmd.com/read/28165927/is-3d-printing-safe-analysis-of-the-thermal-treatment-of-thermoplastics-abs-pla-pet-and-nylon
#6
Szymon Wojtyła, Piotr Klama, Tomasz Baran
The fast development of low-cost desktop three-dimensional (3D) printers has made those devices widely accessible for goods manufacturing at home. However, is it safe? Users may belittle the effects or influences of pollutants (organic compounds and ultrafine particles) generated by the devices in question. Within the scope of this study, the authors attempt to investigate thermal decomposition of the following commonly used, commercially available thermoplastic filaments: acrylonitrile-butadiene-styrene (ABS), polylactic acid (PLA), polyethylene terephthalate (PET), and nylon...
February 6, 2017: Journal of Occupational and Environmental Hygiene
https://www.readbyqxmd.com/read/28161684/silk-based-anisotropical-3d-biotextiles-for-bone-regeneration
#7
Viviana P Ribeiro, Joana Silva-Correia, Ana I Nascimento, Alain da Silva Morais, Alexandra P Marques, Ana S Ribeiro, Carla J Silva, Graça Bonifácio, Rui A Sousa, Joaquim M Oliveira, Ana L Oliveira, Rui L Reis
Bone loss in the craniofacial complex can been treated using several conventional therapeutic strategies that face many obstacles and limitations. In this work, novel three-dimensional (3D) biotextile architectures were developed as a possible strategy for flat bone regeneration applications. As a fully automated processing route, this strategy as potential to be easily industrialized. Silk fibroin (SF) yarns were processed into weft-knitted fabrics spaced by a monofilament of polyethylene terephthalate (PET)...
January 26, 2017: Biomaterials
https://www.readbyqxmd.com/read/28158070/biaxial-stress-and-optoelectronic-properties-of-al-doped-zno-thin-films-deposited-on-flexible-substrates-by-radio-frequency-magnetron-sputtering
#8
Hsi-Chao Chen, Po-Wei Cheng, Kuo-Ting Huang
Transparent conductive Al-doped ZnO (AZO) thin films were deposited on polyethylene terephthalate (PET) and polycarbonate (PC) substrates using radio frequency (RF) magnetron sputtering. The biaxial stress was measured with a double beam shadow moiré interferometer, and x-ray diffraction (XRD) was used to investigate the crystal orientation of ZnO. The substrate temperature was varied from room temperature to 150°C in steps of 25°C. The experimental results showed that the residual and shearing stresses increased with the increase in substrate temperature...
February 1, 2017: Applied Optics
https://www.readbyqxmd.com/read/28153171/forces-and-moments-applied-during-derotation-of-a-maxillary-central-incisor-with-thinner-aligners-an-in-vitro-study
#9
Fayez Elkholy, Falko Schmidt, Rudolf Jäger, Bernd G Lapatki
INTRODUCTION: Recent studies have shown that therapeutic loads applied to individual teeth by aligners may substantially exceed recommended values. The primary purpose of this study was to quantify force and moment components during derotation of a maxillary central incisor when 0.3-mm-thick or 0.4-mm-thick polyethylene terephthalate glycol aligners were used instead of conventional polyethylene terephthalate glycol aligners with a minimum thickness of 0.5 mm. METHODS: The test setup consisted of an acrylic model of a maxilla with a separated right central incisor mounted on a 3-dimensional force and moment sensor...
February 2017: American Journal of Orthodontics and Dentofacial Orthopedics
https://www.readbyqxmd.com/read/28135071/versatile-transfer-of-an-ultralong-and-seamless-nanowire-array-crystallized-at-high-temperature-for-use-in-high-performance-flexible-devices
#10
Min-Ho Seo, Jae-Young Yoo, So-Young Choi, Jae-Shin Lee, Kwang-Wook Choi, Chang Kyu Jeong, Keon Jae Lee, Jun-Bo Yoon
Nanowire (NW) transfer technology has provided promising strategies to realize future flexible materials and electronics. Using this technology, geometrically controlled, high-quality NW arrays can now be obtained easily on various flexible substrates with high throughput. However, it is still challenging to extend this technology to a wide range of high-performance device applications because its limited temperature tolerance precludes the use of high-temperature annealing, which is essential for NW crystallization and functionalization...
February 2, 2017: ACS Nano
https://www.readbyqxmd.com/read/28128951/cleavage-product-accumulation-decreases-the-activity-of-cutinase-during-pet-hydrolysis
#11
Christine Groß, Kay Hamacher, Katja Schmitz, Sven Jager
The Fusarium solani cutinase (FsC) is a promising candidate for the enzymatic degradation of the synthetic polyester polyethylene terephthalate (PET) but still suffers from a lack of activity. Using atomic MD simulations with different concentrations of cleavage product ethylene glycol (EG), we show influences of EG on the dynamic of FsC. We observed accumulation of EG in the active site region reducing the local flexibility of FsC. Furthermore, we used a coarse-grained mechanical model to investigate whether substrate binding in the active site causes an induced fit...
January 27, 2017: Journal of Chemical Information and Modeling
https://www.readbyqxmd.com/read/28121446/water-vapour-sorption-properties-of-polyethylene-terephtalate-over-a-wide-range-of-humidity-and-temperature
#12
Florence Dubelley, Emilie Planes, Corine Bas, Emmanuelle Pons, Bernard Yrieix, Lionel Flandin
The dynamic and equilibrium water vapour sorption properties of amorphous polyethylene terephthalate were determined via gravimetric analysis over a wide range of temperature (23-70 °C) and humidity (0-90 %RH). At low temperature and relative humidity, the dynamics of the sorption process was Fickian. Increasing temperature or relative humidity induced a clear up-swing effect, which is associated to a plasticization/clustering phenomenon. For high temperatures and relative humidity, a densification of the polymer was observed revealing a non-monotonous behaviour...
January 25, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28108064/stent-and-leaflet-stresses-in-a-26-mm-first-generation-balloon-expandable-transcatheter-aortic-valve
#13
Yue Xuan, Kapil Krishnan, Jian Ye, Danny Dvir, Julius M Guccione, Liang Ge, Elaine E Tseng
OBJECTIVE: Transcatheter aortic valve replacement is established therapy for high-risk and inoperable patients with severe aortic stenosis, but questions remain regarding long-term durability. Valve design influences durability. Increased leaflet stresses in surgical bioprostheses have been correlated with degeneration; however, transcatheter valve leaflet stresses are unknown. From 2007 to 2014, a majority of US patients received first-generation balloon-expandable transcatheter valves...
December 23, 2016: Journal of Thoracic and Cardiovascular Surgery
https://www.readbyqxmd.com/read/28101943/stability-of-color-in-spanish-style-green-table-olives-pasteurized-and-stored-in-plastic-containers
#14
Antonio Higinio Sánchez, Antonio López-López, Víctor Manuel Beato, Antonio de Castro, Alfredo Montaño
BACKGROUND: There is an increasing interest in the use of pasteurizable plastic packaging by the olive industry. In order to investigate the change from traditional glass or varnished can containers to plastic packaging, the proper plastic material that is compatible with fermented olives while maintaining color quality during pasteurization treatment and storage must be selected. This work is focused on color stability in two distinct pasteurizable plastic containers with different oxygen permeability...
January 19, 2017: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/28093951/qualitative-comparison-of-polyethylene-terephthalate-flakes-from-various-collection-systems-in-germany
#15
H Snell, A Nassour, M Nelles
In 2003, a deposit system for one-way packaging was introduced in Germany. Since that time, polyethylene terephthalate beverage packaging is collected through various collection systems, a deposit system, a reusable packaging system and the 'Green Dot' (the dual system) with the yellow bag. The manner of collection had a decisive influence on the quality of the generated recycled materials. The research at hand shows for the first time how the quality of polyethylene terephthalate flakes depends on the type of collection system...
January 1, 2017: Waste Management & Research
https://www.readbyqxmd.com/read/28092172/analysis-of-indium-tin-oxide-film-using-argon-fluroide-arf-laser-excited-atomic-fluorescence-of-ablated-plumes
#16
Sut Kam Ho, Dario Machado Garcia
A two-pulse laser-excited atomic fluorescence (LEAF) technique at 193 nm wavelength was applied to the analysis of indium tin oxide (ITO) layer on polyethylene terephthalate (PET) film. Fluorescence emissions from analytes were induced from plumes generated by first laser pulse. Using this approach, non-selective LEAF can be accomplished for simultaneous multi-element analysis and it overcomes the handicap of strict requirement for laser excitation wavelength. In this study, experimental conditions including laser fluences, times for gating and time delay between pulses were optimized to reveal high sensitivity with minimal sample destruction and penetration...
January 1, 2017: Applied Spectroscopy
https://www.readbyqxmd.com/read/28080027/asymmetric-pentagonal-metal-meshes-for-flexible-transparent-electrodes-and-heaters
#17
Daniel Lordan, Micheal Burke, Mary Manning, Alfonso Martin, Andreas Amann, Dan O'Connell, Richard Murphy, Colin Lyons, Aidan J Quinn
Metal meshes have emerged as an important class of flexible transparent electrodes. We report on the characteristics of a new class of asymmetric meshes, tiled using a recently discovered family of pentagons. Micron-scale meshes were fabricated on flexible polyethylene terephthalate substrates via optical lithography, metal evaporation (Ti 10 nm, Pt 50 nm), and lift-off. Three different designs were assessed, each with the same tessellation pattern and line width (5 μm), but with different sizes of the fundamental pentagonal unit...
January 27, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28068108/transferability-and-adhesion-of-sol-gel-derived-crystalline-tio2-thin-films-to-different-types-of-plastic-substrates
#18
Natsumi Amano, Mitsuru Takahashi, Hiroaki Uchiyama, Hiromitsu Kozuka
Anatase thin films were prepared on various plastic substrates by our recently developed sol-gel transfer technique. Polycarbonate (PC), poly(methyl methacrylate) (PMMA), polyethylene terephthalate (PET), polyethylene (PE), polypropylene (PP), polyether ether ketone (PEEK), and polyvinylidene chloride (PVDC) were employed as plastic substrates. A Si(100) substrate was first coated with a polyimide (PI)/polyvinylpyrrolidone (PVP) mixture layer, and an alkoxide-derived titania gel film was deposited on it by spin-coating...
January 20, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/28067992/human-finger-electronics-based-on-opposing-humidity-resistance-responses-in-carbon-nanofilms
#19
Yanlong Tai, Gilles Lubineau
Carbon nanomaterials have excellent humidity sensing properties. Here, it is demonstrated that multiwalled carbon-nanotube (MWCNT)- and reduced-graphene-oxide (rGO)-based conductive films have opposite humidity/electrical resistance responses: MWCNTs increase their electrical resistance (positive response) and rGOs decrease their electrical resistance (negative response). The authors propose a new phenomenology that describes a "net"-like model for MWCNT films and a "scale"-like model for rGO films to explain these behaviors based on contributions from junction resistances (at interparticle junctions) and intrinsic resistances (of the particles)...
January 9, 2017: Small
https://www.readbyqxmd.com/read/28056438/antibacterial-and-anti-biofilm-efficacy-of-fluoropolymer-coating-by-a-2-3-5-6-tetrafluoro-p-phenylenedimethanol-structure
#20
Qian Bao, Norihito Nishimura, Hirotoshi Kamata, Kentaro Furue, Yuki Ono, Masaaki Hosomi, Akihiko Terada
Fluorinated polymers generally function as antibacterial agents, but their anti-biofilm effect remains unresolved. This study investigates the efficacy of fluoropolymers containing 2,3,5,6-tetrafluoro-p-phenylenedimethanol (TFPDM) in preventing biofilm formation by Bacillus subtilis and Escherichia coli (Gram-positive and Gram-negative bacterial species). To this end, TFPDM-based acrylate and epoxy polymers (AF and EF, respectively) and their structural analogues without TFPDM (A and E, respectively) were synthesized...
December 15, 2016: Colloids and Surfaces. B, Biointerfaces
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