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polyethylene terephthalate

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https://www.readbyqxmd.com/read/29685604/temperature-dependent-separation-of-immiscible-polymer-blend-in-a-melted-state
#1
Károly Dobrovszky
The density and the spectral fingerprint of a compounded blend or composite vary widely depending on the type of the components and their composition. However, the currently used polymer separation techniques, such as density-based and optical sorting systems are not suitable for recovering these materials fully due to the physical-chemical bonding between the components. The application of a novel separation principle creates the opportunity to enrich the blend fractions to neat, homogeneous zones in a melted state by utilising centrifugal force...
April 20, 2018: Waste Management
https://www.readbyqxmd.com/read/29671442/flexible-random-lasers-with-tunable-lasing-emissions
#2
Ya-Ju Lee, Chun-Yang Chou, Zu-Po Yang, Thi Bich Hanh Nguyen, Yung-Chi Yao, Ting-Wei Yeh, Meng-Tsan Tsai, Hao-Chun Kuo
In this study, we experimentally demonstrated a flexible random laser fabricated on a polyethylene terephthalate (PET) substrate with a high degree of tunability in lasing emissions. Random lasing oscillation arises mainly from the resonance coupling between the emitted photons of gain medium (Rhodamine 6G, R6G) and the localized surface plasmon (LSP) of silver nanoprisms (Ag NPRs), which increases the effective cross-section for multiple light scattering, thus stimulating the lasing emissions. More importantly, it was found that the random lasing wavelength is blue-shifted monolithically with the increase in bending strains exerted on the PET substrate, and a maximum shift of ∼15 nm was achieved in the lasing wavelength, when a 50% bending strain was exerted on the PET substrate...
April 19, 2018: Nanoscale
https://www.readbyqxmd.com/read/29668484/flexible-gas-sensor-based-on-graphene-ethyl-cellulose-nanocomposite-with-ultra-low-strain-response-for-volatile-organic-compounds-rapid-detection
#3
Qiankun Zhang, Chunhua An, Shuangqing Fan, Sigang Shi, Rongjie Zhang, Jing Zhang, Quanning Li, Daihua Zhang, Xiaodong Hu, Jing Liu
Minimizing the strain induced undesirable effects is one of the major efforts to be made for flexible electronics. This work reports a highly sensitive flexible gas sensor with ultra-low strain response, which is potentially suitable for wearable electronics applications. The gas sensing material is a free-standing and flexible thin film made of graphene/ethyl cellulose (EC) nanocomposite, which is then integrated with flexible substrate of polyethylene terephthalate. The sensor exhibits relative resistance change within 0...
April 18, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29667491/optimization-of-3d-print-material-for-the-recreation-of-patient-specific-temporal-bone-models
#4
Max Haffner, Austin Quinn, Tsung-Yen Hsieh, E Bradley Strong, Toby Steele
OBJECTIVE: Identify the 3D printed material that most accurately recreates the visual, tactile, and kinesthetic properties of human temporal bone Subjects and Methods: Fifteen study participants with an average of 3.6 years of postgraduate training and 56.5 temporal bone (TB) procedures participated. Each participant performed a mastoidectomy on human cadaveric TB and five 3D printed TBs of different materials. After drilling each unique material, participants completed surveys to assess each model's appearance and physical likeness on a Likert scale from 0 to 10 (0 = poorly representative, 10 = completely life-like)...
May 2018: Annals of Otology, Rhinology, and Laryngology
https://www.readbyqxmd.com/read/29666242/characterization-and-engineering-of-a-plastic-degrading-aromatic-polyesterase
#5
Harry P Austin, Mark D Allen, Bryon S Donohoe, Nicholas A Rorrer, Fiona L Kearns, Rodrigo L Silveira, Benjamin C Pollard, Graham Dominick, Ramona Duman, Kamel El Omari, Vitaliy Mykhaylyk, Armin Wagner, William E Michener, Antonella Amore, Munir S Skaf, Michael F Crowley, Alan W Thorne, Christopher W Johnson, H Lee Woodcock, John E McGeehan, Gregg T Beckham
Poly(ethylene terephthalate) (PET) is one of the most abundantly produced synthetic polymers and is accumulating in the environment at a staggering rate as discarded packaging and textiles. The properties that make PET so useful also endow it with an alarming resistance to biodegradation, likely lasting centuries in the environment. Our collective reliance on PET and other plastics means that this buildup will continue unless solutions are found. Recently, a newly discovered bacterium, Ideonella sakaiensis 201-F6, was shown to exhibit the rare ability to grow on PET as a major carbon and energy source...
April 17, 2018: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29664732/fibrous-composite-material-for-textile-heart-valve-design-in-vitro-assessment
#6
Amna Amri, Gaetan Laroche, Nabil Chakfe, Frederic Heim
With over 150,000 implantations performed over the world, transcatheter aortic valve replacement (TAVR) has become a surgical technique, which largely competes with open surgery valve replacement for an increasing number of patients. The success of the procedure favors the research toward synthetic valve leaflet materials as an alternative to biological tissues, whose durability remains unknown. In particular, fibrous constructions have recently proven to be durable in vivo over a 6-month period of time in animal sheep models...
April 17, 2018: Biomedizinische Technik. Biomedical Engineering
https://www.readbyqxmd.com/read/29664279/flexible-array-of-micro-supercapacitor-for-additive-energy-storage-performance-over-a-large-area
#7
Buddha Deka Boruah, Arnab Maji, Abha Misra
On-chip micro-supercapacitor (MSC) pattern is obtained by layer-by-layer spray deposition of both manganese dioxide (MnO2) nanoparticles coated carbon nanotubes (MnO2-CNTs) and MnO2 nanosheets decorated reduced graphene oxide (MnO2-rGO) on mechanically robust, flexible polyethylene terephthalate. Layer-by-layer patterning of MSC electrode offers rapid in-plane diffusion of electrolyte ion in electrode with respect to the layered electrode and hence increase in the synergistic response under energy storage process...
April 17, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29652835/fabrication-of-flexible-microneedle-array-electrodes-for-wearable-bio-signal-recording
#8
Lei Ren, Shujia Xu, Jie Gao, Zi Lin, Zhipeng Chen, Bin Liu, Liang Liang, Lelun Jiang
Laser-direct writing (LDW) and magneto-rheological drawing lithography (MRDL) have been proposed for the fabrication of a flexible microneedle array electrode (MAE) for wearable bio-signal monitoring. Conductive patterns were directly written onto the flexible polyethylene terephthalate (PET) substrate by LDW. The microneedle array was rapidly drawn and formed from the droplets of curable magnetorheological fluid with the assistance of an external magnetic field by MRDL. A flexible MAE can maintain a stable contact interface with curved human skin due to the flexibility of the PET substrate...
April 13, 2018: Sensors
https://www.readbyqxmd.com/read/29651022/disposable-all-printed-electronic-biosensor-for-instantaneous-detection-and-classification-of-pathogens
#9
Shawkat Ali, Arshad Hassan, Gul Hassan, Chang-Ho Eun, Jinho Bae, Chong Hyun Lee, In-Jung Kim
A novel disposable all-printed electronic biosensor is proposed for a fast detection and classification of bacteria. This biosensor is applied to classify three types of popular pathogens: Salmonella typhimurium, and the Escherichia coli strains JM109 and DH5-α. The proposed sensor consists of inter-digital silver electrodes fabricated through an inkjet material printer and silver nanowires uniformly decorated on the electrodes through the electrohydrodynamic technique on a polyamide based polyethylene terephthalate substrate...
April 12, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29619341/right-carotid-cutaneous-fistula-and-right-carotid-pseudoaneurysm-formation-secondary-to-a-chronically-infected-polyethylene-terephthalate-patch
#10
W T Hillman Terzian, Samuel Schadt, Sharvil U Sheth
Carotid endarterectomy (CEA) remains the treatment for significant carotid stenosis and stroke prevention. Approximately 100,000 CEAs are performed in the United States every year. Randomized trials have demonstrated an advantage of patch carotid angioplasty over primary closure. Complications from patches include thrombosis, transient ischemic attack, stroke, restenosis, pseudoaneurysm (PA), and infection. PA after CEA is rare, with a reported average of 0.37% of cases. We describe an unusual case of PA after polyethylene terephthalate (PTFE) patching for CEA...
January 2018: International Journal of Critical Illness and Injury Science
https://www.readbyqxmd.com/read/29611128/identification-and-quantitation-of-semi-crystalline-microplastics-using-image-analysis-and-differential-scanning-calorimetry
#11
Mauricio Rodríguez Chialanza, Ignacio Sierra, Andrés Pérez Parada, Laura Fornaro
There are several techniques used to analyze microplastics. These are often based on a combination of visual and spectroscopic techniques. Here we introduce an alternative workflow for identification and mass quantitation through a combination of optical microscopy with image analysis (IA) and differential scanning calorimetry (DSC). We studied four synthetic polymers with environmental concern: low and high density polyethylene (LDPE and HDPE, respectively), polypropylene (PP), and polyethylene terephthalate (PET)...
April 3, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29590588/active-site-flexibility-as-a-hallmark-for-efficient-pet-degradation-by-i-sakaiensis-petase
#12
Tobias Fecker, Pablo Galaz-Davison, Felipe Engelberger, Yoshie Narui, Marcos Sotomayor, Loreto P Parra, César A Ramírez-Sarmiento
Polyethylene terephthalate (PET) is one of the most-consumed synthetic polymers, with an annual production of 50 million tons. Unfortunately, PET accumulates as waste and is highly resistant to biodegradation. Recently, fungal and bacterial thermophilic hydrolases were found to catalyze PET hydrolysis with optimal activities at high temperatures. Strikingly, an enzyme from Ideonella sakaiensis, termed PETase, was described to efficiently degrade PET at room temperature, but the molecular basis of its activity is not currently understood...
March 27, 2018: Biophysical Journal
https://www.readbyqxmd.com/read/29573715/concentrations-and-congener-profiles-of-chlorinated-paraffins-in-domestic-polymeric-products-in-china
#13
Chu Wang, Wei Gao, Yong Liang, Yawei Wang, Guibin Jiang
Chlorinated paraffins (CPs) are widely used in domestic polymeric products as plasticizers and fire retardants. In this study, concentrations and congener profiles of short-chain and medium-chain chlorinated paraffins (SCCPs and MCCPs) were investigated in domestic polymeric products, including plastics, rubber and food packaging in China. The average concentrations of SCCPs in polyethylene terephthalate (PET), polypropylene (PP), polyethylene (PE) and food packaging were 234, 3968, 150 and 188 ng/g, respectively and the corresponding average concentrations of MCCPs in these samples were 37...
March 21, 2018: Environmental Pollution
https://www.readbyqxmd.com/read/29571417/ingestion-of-microplastics-and-natural-fibres-in-sardina-pilchardus-walbaum-1792-and-engraulis-encrasicolus-linnaeus-1758-along-the-spanish-mediterranean-coast
#14
Montserrat Compa, Ana Ventero, Magdalena Iglesias, Salud Deudero
The ingestion of microplastics and natural fibres (<5 mm) was assessed for two commercial fish species in the western Mediterranean Sea: Sardina pilchardus and Engraulis encrasicolus. Gastrointestinal tracts from 210 individuals from 14 stations were examined with 14.28-15.24% of the small pelagic fish S. pilchardus and E. encrasicolus having ingested microplastics and natural fibres. A latitudinal increase in condition index (Fulton's K) of S. pilchardus gave an indication that larger individuals with better physical condition are less likely to ingest microplastics and natural fibres...
March 2018: Marine Pollution Bulletin
https://www.readbyqxmd.com/read/29562603/effect-of-target-composition-and-sputtering-deposition-parameters-on-the-functional-properties-of-nitrogenized-ag-permalloy-flexible-thin-films-deposited-on-polymer-substrates
#15
Waheed Khan, Qun Wang, Xin Jin
We report the first results of functional properties of nitrogenized silver-permalloy thin films deposited on polyethylene terephthalic ester {PETE (C10 H₈O₄)n } flexible substrates by magnetron sputtering. These new soft magnetic thin films have magnetization that is comparable to pure Ni81 Fe19 permalloy films. Two target compositions (Ni76 Fe19 Ag₅ and Ni72 Fe18 Ag10 ) were used to study the effect of compositional variation and sputtering parameters, including nitrogen flow rate on the phase evolution and surface properties...
March 17, 2018: Materials
https://www.readbyqxmd.com/read/29559885/a-compact-closed-loop-optogenetics-system-based-on-artifact-free-transparent-graphene-electrodes
#16
Xin Liu, Yichen Lu, Ege Iseri, Yuhan Shi, Duygu Kuzum
Electrophysiology is a decades-old technique widely used for monitoring activity of individual neurons and local field potentials. Optogenetics has revolutionized neuroscience studies by offering selective and fast control of targeted neurons and neuron populations. The combination of these two techniques is crucial for causal investigation of neural circuits and understanding their functional connectivity. However, electrical artifacts generated by light stimulation interfere with neural recordings and hinder the development of compact closed-loop systems for precise control of neural activity...
2018: Frontiers in Neuroscience
https://www.readbyqxmd.com/read/29555071/modern-procedures-for-removal-of-hazardous-compounds-from-foods
#17
Peter Šimko
This chapter deals with interactions between foods or food additives and plastic package materials oriented to elimination of hazardous compounds from foods. As found, polycyclic aromatic hydrocarbons (PAHs) can be effectively eliminated from liquid smoke flavors and smoked meat products by migration of PAHs into low-density polyethylene (LDPE), when the limiting factor of the elimination is diffusion in food matrix. After leaving food bulk, PAHs migrate deeper into LDPE bulk what brings about permanent renewal of material imbalance on LDPE/food matrix interface that maintains the migration process in an intensive regime causing extensive lowering of PAH content in food matrix...
2018: Advances in Food and Nutrition Research
https://www.readbyqxmd.com/read/29540990/the-effect-of-storage-time-temperature-and-type-of-packaging-on-the-release-of-phthalate-esters-into-packed-acidic-liquids
#18
Noushin Rastkari, Maryam Zare Jeddi, Masud Yunesian, Reza Ahmadkhaniha
Acidic liquids such as verjuice, lemon juice and vinegar are frequently consumed in Iran. Different kinds of acidic liquids are packaged in polyethylene terephthalate (PET) and high-density polyethylene (HDPE) bottles. There is evidence indicating that phthalates can leach from PET and HDPE bottles into their contents. In this work the effect of storage time, temperature and bottle type on the migration of phthalates from packaging materials into acidic liquids is studied by analyzing the samples stored under different conditions, before storage and after 2, 4 and 6 months of storage...
December 2017: Food Technology and Biotechnology
https://www.readbyqxmd.com/read/29540713/influence-of-polymer-substrate-damage-on-the-time-dependent-cracking-of-sin-x-barrier-films
#19
Kyungjin Kim, Hao Luo, Ting Zhu, Olivier N Pierron, Samuel Graham
This work is concerned with the long-term behavior of environmentally-assisted subcritical cracking of PECVD SiNx barrier films on polyethylene terephthalate (PET) and polyimide (PI) substrates. While environmentally-assisted channel cracking in SiNx has been previously demonstrated, with constant crack growth rates over short periods of time (<1 hour) during which no substrate damage was observed, the present experiments over longer periods reveal a regime where cracking also develops in the polymer substrate...
March 14, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29537024/electrohydrodynamic-printing-of-silver-nanowires-for-flexible-and-stretchable-electronics
#20
Zheng Cui, Yiwei Han, Qijin Huang, Jingyan Dong, Yong Zhu
A silver nanowire (AgNW) based conductor is a promising component for flexible and stretchable electronics. A wide range of flexible/stretchable devices using AgNW conductors has been demonstrated recently. High-resolution, high-throughput printing of AgNWs remains a critical challenge. Electrohydrodynamic (EHD) printing has been developed as a promising technique to print different materials on a variety of substrates with high resolution. Here, AgNW ink was developed for EHD printing. The printed features can be controlled by several parameters including AgNW concentration, ink viscosity, printing speed, stand-off distance, etc...
March 14, 2018: Nanoscale
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