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polyethylene terephthalate

Stephen R Kubota, Kyoung-Shin Choi
2,5-Furandicarboxylic acid (FDCA) has become an increasingly desirable platform chemical to replace terephthalic acid in the production of a variety of polymeric materials, including polyethylene terephthalate. FDCA can be produced by the oxidation of 5-hydroxymethylfurfural (HMF), which can be derived from cellulosic biomass. Oxidation of HMF to FDCA is typically performed under basic conditions. Separation of FDCA is most easily accomplished by lowering the pH until FDCA is insoluble and filtering it from solution...
June 15, 2018: ChemSusChem
Jakub Krajniak, Zidan Zhang, Sudharsan Pandiyan, Eric Nies, Giovanni Samaey
We develop novel parallel algorithms that allow molecular dynamics simulations in which byproduct molecules are created and removed because of the chemical reactions during the molecular dynamics simulation. To prevent large increases in the potential energy, we introduce the byproduct molecules smoothly by changing the non-bonded interactions gradually. To simulate complete equilibrium reactions, we allow the byproduct molecules attack and destroy created bonds. Modeling of such reactions are, for instance, important to study the pore formation due to the presence of e...
June 11, 2018: Journal of Computational Chemistry
Ryszard Pawlak, Marcin Lebioda
This paper presents an analysis of the electrical and thermal properties of miniature transparent heaters for use in a wide range of temperature applications, from 15 K to 350 K. The heater structures were produced in transparent conducting oxide (TCO) layers: indium tin oxide (ITO) and ITO/Ag/ITO on polymer substrates-polyethylene naphthalate (PEN) and polyethylene terephthalate (PET), by direct laser patterning. Thermo-resistors for temperature measurement were created in the same process, with geometry corresponding to the shape of the heating path...
June 5, 2018: Sensors
Jianmin Zhao, Wen Ran, Jia Teng, Yongliang Liu, Hui Liu, Xiaonan Yin, Ruiwen Cao, Qing Wang
Microplastics are one of the most significant pollutants in the marine environment and accumulate in sediments all over the world. To assess the pollution level in the marine environment in China, the distribution and abundance of microplastics in sediments from the Bohai Sea and the Yellow Sea were investigated in this study. The sediment samples were collected from 72 different sites in the Bohai Sea and the Yellow Sea. Microplastics were separated from sediment through density flotation and categorized according to shape and size under a microscope...
June 2, 2018: Science of the Total Environment
Fatma Masmoudi, Françoise Fenouillot, Afef Mehri, Mohamed Jaziri, Emna Ammar
In the present study, the recycled post-consumption polyethylene terephthalate (PET) flakes were investigated as possible raw materials for the production of food packaging. After heating at 220 °C for 1 h, a steaming stage was conducted as a control test to assess the quality of the product. Different samples were characterized by 1 H-NMR, FT-IR, DSC/TGA analysis, viscosity index (VI), and trace metals analysis. The results showed that the recycled post-consumed PET flakes' properties were generally conform to the standard norms of PET except the color of some flakes turned to yellow...
June 5, 2018: Environmental Science and Pollution Research International
Xiuyi Lin, Jing Yu, Hedong Li, Jeffery Y K Lam, Kaimin Shih, Ivan M L Sham, Christopher K Y Leung
As an important portion of the total plastic waste bulk but lack of reuse and recycling, the enormous amounts of polyethylene terephthalate (PET) solid wastes have led to serious environmental issues. This study explores the feasibility of recycling PET solid wastes as short fibers in Strain-Hardening Cementitious Composites (SHCCs), which exhibit strain-hardening and multiple cracking under tension, and therefore have clear advantages over conventional concrete for many construction applications. Based on micromechanical modeling, fiber dispersion and alkali resistance, the size of recycled PET fibers was first determined...
May 26, 2018: Journal of Hazardous Materials
Qi Wei, Jinhui Chen, Ping Ding, Bo Shen, Jiang Yin, Fei Xu, Yidong Xia, Zhi-Guo Liu
Bismuth triiodide, BiI3, is one of the promising 2D layered materials from the family of metal halides. The unique electronic structure and properties make it an attractive material for the room temperature gamma/x-ray detectors, high-efficiency photovoltaic absorbers and Bi-based organic-inorganic hybrid perovskites. Other possibilities including optoelectronic devices and optical circuits are envisioned but rarely experimentally confirmed yet. Here we report the synthesis of vertical 2D BiI3 nanoplates using the physical vapor deposition mechanism...
May 31, 2018: ACS Applied Materials & Interfaces
Jeun-Yan Lam, Chien-Chung Shih, Wen-Ya Lee, Chu-Chen Chueh, Guang-Way Jang, Cheng-Jyun Huang, Shih-Huang Tung, Wen-Chang Chen
Exploiting biomass has raised great interest as an alternative to the fossil resources for environmental protection. In this respect, polyethylene furanoate (PEF), one of the bio-based polyesters, thus reveals a great potential to replace the commonly used polyethylene terephthalate (PET) on account of its better mechanical, gas barrier, and thermal properties. Herein, a bio-based, flexible, conductive film is successfully developed by coupling a PEF plastic substrate with silver nanowires (Ag NWs). Besides the appealing advantage of renewable biomass, PEF also exhibits a good transparency around 90% in the visible wavelength range, and its constituent polar furan moiety is revealed to enable an intense interaction with Ag NWs to largely enhance the adhesion of Ag NWs grown above, as exemplified by the superior bending and peeling durability than the currently prevailing PET substrate...
May 30, 2018: Macromolecular Rapid Communications
Seong-Joong Kahng, Chiew Cerwyn, Brian M Dincau, Jong-Hoon Kim, Igor V Novosselov, M P Anantram, Jae-Hyun Chung
Single-walled carbon nanotubes (SWCNTs) are used as a key component for chemical sensors. For miniature scale design, a continuous printing method is preferred for electrical conductance without damaging the substrate. In this paper, a non-contact capillary pen printing method is presented by the formation of a nanoink bridge between the nib of a capillary pen and a polyethylene terephthalate (PET) film. A critical parameter for stable printing is the advancing contact angle at the bridge meniscus, which is a function of substrate temperature and printing speed...
May 29, 2018: Nanotechnology
Shinya Kano, Yasuhiro Tada, Satoshi Matsuda, Minoru Fujii
We demonstrate solution processing of hydrogen-terminated silicon nanocrystals (H-Si NC) for flexible electronic devices. To obtain high and uniform conductivity of a solution-processed Si NC film, we adopt a perfectly dispersed colloidal H-Si NC solution. We show a high conductivity (2 × 10-5 S/cm) of a solution-processed H-Si NC film which is spin-coated in air. The NC film (area: 100 mm2 ) has uniform conductivity and responds to laser irradiation with 6.8 and 24.1 μs of rise and fall time. By using time-of-flight measurements, we propose a charge transport model in the H-Si NC film...
May 29, 2018: ACS Applied Materials & Interfaces
Monika Kumaraswamy, Sean Collignon, Carter Do, Janie Kim, Victor Nizet, James Friend
We evaluated the ability of a novel lithium niobate (LN) thickness-mode device to atomize disinfectants and reduce microbial burden on model surface materials. A small-scale plastic model housed the LN thickness-mode device and circular coupon surface materials including polycarbonate, polyethylene terephthalate, stainless steel, borosilicate glass, and natural rubber. Coupon surfaces were coated with methicillin-resistant Staphylococcus aureus (MRSA) or multidrug-resistant (MDR) strains of Gram-negative bacterial pathogens (Klebsiella pneumoniae, Escherichia coli, and Acinetobacter baumannii), atomized with disinfectant solutions of varying viscosity (including 10% bleach, 70% ethanol (EtOH), or 25% triethylene glycol (TEG)) using the LN thickness-mode device, and assessed for surviving bacteria...
May 26, 2018: Applied Microbiology and Biotechnology
Barbara E Oßmann, George Sarau, Heinrich Holtmannspötter, Monika Pischetsrieder, Silke H Christiansen, Wilhelm Dicke
Up to now, only a few studies about microparticle contamination of bottled mineral water have been published. The smallest analysed particle size was 5 μm. However, due to toxicological reasons, especially microparticles smaller than 1.5 μm are critically discussed. Therefore, in the present study, 32 samples of bottled mineral water were investigated for contamination by microplastics, pigment and additive particles. Due to the application of aluminium coated polycarbonate membrane filters and micro-Raman spectroscopy, a lowest analysed particle size of 1 μm was achieved...
May 16, 2018: Water Research
Wanvisa Talataisong, Rand Ismaeel, Thiago H R Marques, Seyedmohammad Abokhamis Mousavi, Martynas Beresna, M A Gouveia, Seyed Reza Sandoghchi, Timothy Lee, Cristiano M B Cordeiro, Gilberto Brambilla
Mid-infrared (mid-IR) optical fibers have long attracted great interest due to their wide range of applications in security, biology and chemical sensing. Traditionally, research was directed towards materials with low absorption in the mid-IR region, such as chalcogenides, which are difficult to manipulate and often contain highly toxic elements. In this paper, we demonstrate a Polyethylene Terephthalate Glycol (PETG) hollow-core fiber (HCF) with guiding properties in the mid-IR. Guiding is provided by the fiber geometry, as PETG exhibits a material attenuation 2 orders of magnitude larger than the HCF propagation loss...
May 25, 2018: Scientific Reports
Feyza Dundar Arisoy, Kristopher W Kolewe, Benjamin Homyak, Irene S Kurtz, Jessica D Schiffman, James J Watkins
By combining antifouling shark-skin patterns with antibacterial titanium dioxide (TiO2 ) nanoparticles (NPs), we present a simple route toward producing durable multifunctional surfaces that decrease microbial attachment and inactivate attached microorganisms. Norland Optical Adhesive, a UV-crosslinkable adhesive material, was loaded with 0, 10, or 50 wt % TiO2 NPs from which shark-skin microstructures were imprinted using solvent-assisted soft nanoimprint lithography on a poly(ethylene terephthalate) (PET) substrate...
June 1, 2018: ACS Applied Materials & Interfaces
Lei Zhang, Nadiia Pasthukova, Yifan Yao, Xiaolan Zhong, Egon Pavlica, Gvido Bratina, Emanuele Orgiu, Paolo Samorì
Self-standing nanostructures are of fundamental interest in materials science and nanoscience and are widely used in (opto-)electronic and photonic devices as well as in micro-electromechanical systems. To date, large-area and self-standing nanoelectrode arrays assembled on flexible substrates have not been reported. Here the fabrication of a hollow nanomesh scaffold on glass and plastic substrates with a large surface area over 1 mm2 and ultralow leakage current density (≈1-10 pA mm-2 @ 2 V) across the empty scaffold is demonstrated...
May 21, 2018: Advanced Materials
My Duyen Ho, Yiyi Liu, Dashen Dong, Yunmeng Zhao, Wenlong Cheng
Percolation networks of one-dimensional (1D) building blocks (e.g., metallic nanowires or carbon nanotubes) represent the mainstream strategy to fabricate stretchable conductors. One of the inherent limitations is the control over junction resistance between 1D building blocks in natural and strained states of conductors. Herein, we report highly stretchable transparent strain-insensitive conductors using fractal gold (F-Au) nanoframework based on a one-pot templateless wet chemistry synthesis method. The monolayered F-Au nanoframework (∼20 nm in thickness) can be obtained from the one-pot synthesis without any purification steps involved and can be transferred directly to arbitrary substrates like polyethylene terephthalate, food-wrap, polydimethylsiloxane (PDMS), and ecoflex...
May 16, 2018: Nano Letters
Yong-Yan Zhao, Xue-Feng Cheng, Wen-Hu Qian, Jin Zhou, Jing-Hui He, Hua Li, Qing-Feng Xu, Na-Jun Li, Dong-Yun Chen, Jian-Mei Lu
In recent years, numerous organic molecules and polymers carrying various functional groups were synthesized and used in fabrication of wearable electronic devices. Compared to previous materials suffer from poisonousness, stiffness and complex film fabrication, we circumvent above matters by taking advantage of mussel-inspired polydopamine as our active material to realize random resistive access memories (RRAMs). Polydopamine thin film were grown on indium tin oxide glass catalyzed by Cu2SO4/H2O2 and characterized by Fourier infrared spectroscope (FT-IR), Ultra-violet (UV-Vis) and scanning electron microscope...
May 14, 2018: Chemistry, An Asian Journal
Andrea Paul, Lukas Wander, Roland Becker, Caroline Goedecke, Ulrike Braun
The increasing pollution of terrestrial and aquatic ecosystems with plastic debris leads to the accumulation of microscopic plastic particles of still unknown amount. To monitor the degree of contamination, analytical methods are urgently needed, which help to quantify microplastics (MP). Currently, time-costly purified materials enriched on filters are investigated both by micro-infrared spectroscopy and/or micro-Raman. Although yielding precise results, these techniques are time consuming, and are restricted to the analysis of a small part of the sample in the order of few micrograms...
May 12, 2018: Environmental Science and Pollution Research International
Sea C Min, Si Hyeon Roh, Brendan A Niemira, Glenn Boyd, Joseph E Sites, Xuetong Fan, Kimberly Sokorai, Tony Z Jin
Effects of dielectric barrier discharge atmospheric cold plasma (DACP) treatment on the inactivation of Salmonella and the storability of grape tomato were investigated. Grape tomatoes, with or without inoculation with Salmonella, were packaged in a polyethylene terephthalate (PET) commercial clamshell container and cold plasma-treated at 35 kV at 1.1 A for 3 min using a DACP system equipped with a pin-type high-voltage electrode. DACP treatment inactivated Salmonella (p < 0.05) without altering the color or firmness of the grape tomatoes (p > 0...
June 2018: Food Research International
Mubarak Ali, Ishtiaq Ahmed, Patricio Ramirez, Saima Nasir, Salvador Mafe, Christof M Niemeyer, Wolfgang Ensinger
The lithium ion recognition is receiving significant attention because of its application in pharmaceuticals, lubricants, and, especially, in energy technology. We present a nanofluidic device for specific lithium ion recognition via host-guest complexation in a confined environment. A lithium-selective receptor molecule, the aminoethyl-benzo-12-crown-4 (BC12C4-NH2) is designed and functionalized on single conical nanopores in polyethylene terephthalate (PET) membranes. The native carboxylic acid groups on the pore walls are covalently linked with the crown ether moieties and the process is monitored from the changes in the current-voltage (I-V) curves...
May 7, 2018: Analytical Chemistry
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