Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
ABSTRACT When PEG (M.W.∼5000 Daltons) is conjugated to poly( l ‐alanine), the polymer aqueous solutions (<10.0 wt.%) undergo sol‐to‐gel (thermal gelation), whereas it is conjugated to poly( l ‐lactic acid), the polymer aqueous solutions (>30.0 wt.%) undergo gel‐to‐sol (gel melting) as the temperature increases.…
In this paper, a new method for realizing two dimensional cloaking based on scattering cancelation for surface waves is presented. A graphene sheet is considered as a negative permittivity material shell to create cloaking cover for a dielectric object. Appropriate electromagnetic characteristics of graphene in the cl…
Dielectric relaxation processes in various phases of a chiral smectic liquid crystal compound have been investigated over a wide range of frequencies from 10 to 300 kHz. Dielectric spectroscopy reveals the existence of two relaxation frequencies corresponding to the ferroelectric and ferrielectric Goldstone modes in t…
A complete understanding of the interaction between nanoparticles and biological systems, including nanoparticle uptake and distribution and the biological responses, could guide the design of safer and more effective nanoparticles than those currently available. In this study, we compared the distribution in mice ove…
The molecular structure of lubricating motor oils is investigated by X‐ray absorption fine structure spectroscopy measurements. Both fresh and used oils are studied. Although the Zn K‐edge spectra gave information about the degradation of the antiwear/antioxidant zinc dialkyl dithiophosphate (ZDDP) additives within th…
Graphene was synthesized from pentacenequinone molecules on a Cu(111) surface using a three-step thermal treatment process: (1) self-assembly of a single layer molecular film at 190 °C, (2) formation of covalent bonding between adjacent molecules at intermediate temperatures, (3) thermal dehydrogenation and in-plane c…
Three different types of recycled polyurethane (PUR) material, two in powder form from a pulverizing process (one < 50 µm and one < 250 µm) and one in polyol form from a glycolysis process, were used as substitutes for polymeric methylene diphenyl diisocyanate (pMDI) resin at 5%, 15%, and 30% ratio, respectively, to r…
The hydrogen storage/release phenomena on a lithium hydride-polyacetylene composite (LiH-PA) are reported. LiH-PA reversibly releases 2.7 wt % hydrogen. Isotopic experiment and Raman spectroscopy reveal that hydrogen release/storage reaction proceeds via electron transfer between H – and polyacetylene. This is the fir…
Synthetically straightforward conditions have been developed for the preparation of poly(bis 2,2,2-trifluoroethoxy)phosphazene with low PDI (<1.15) at high conversion (75–99%) and on a multigram scale. A combination of 31 P NMR and GPC analyses demonstrate that molecular weight increases linearly as a function of mono…
In this work, we propose an atomically-thin all-graphene planar double barrier resonant tunneling diode that can be realized within a single graphene nanoribbon. The proposed device does not require any doping or external gating and can be fabricated using minimal process steps. The planar architecture of the device a…
Electrically conductive composite materials can be used for a wide range of applications because they combine the advantages of a specific polymeric material (e.g., thermal and mechanical properties) with the electrical properties of conductive filler particles. However, the overall electrical behaviour of these compo…
PPTA is a high-performance fibre with premium mechanical and heat-resistant properties. This study focused on developing cut-resistant gloves from recycled PPTA fibre. The cut resistance of knitted glove, from virgin and recycled PPTA fibre yarn with/without steel core, was evaluated to determine the performance of th…
In this work, glass-fiber-reinforced and unreinforced polypropylene-polyethylene blends were obtained to examine the effects of recycling process on the mechanical and chemical properties. Tensile strength, flexural strength, izod impact strength, and melt flow index tests were applied to test specimens. After recycli…
Biological organisms possess an unparalleled ability to control crystallization of biominerals with convoluted internal structures. For example, an occluded organic matrix can interact with the mineral during its formation to control its morphology and structure. Although related matrix proteins that preferentially nu…
Sr0.7Ho0.3CoO3-δ oxide has been recently described as an excellent cathode material (1274 mW cm(-2) at 850 °C with pure H2 as fuel1) for solid oxide fuel cells (SOFCs) with LSGM as electrolyte. In this work, we describe a detailed study of its crystal structure conducted to find out the correlation between the excelle…
Functionalized poly(butylene succinate) (PBS) samples were prepared by a post-polymerization method based on the coupling reaction between TEMPO derivatives bearing different functionalities and PBS macroradicals generated by H-abstraction using a peroxide. 4-Benzoyloxy-2,2,6,6-tetramethylpiperidine-1-oxyl (BzO-TEMPO)…
Strain-modulated anisotropic electronic charge transfers in perovskite ${\mathrm{Pr}}_{0.67}$${\mathrm{Sr}}_{0.33}$${\mathrm{MnO}}_{3}$ thin films were investigated using polarization dependent x-ray absorption near-edge structure at the Mn $K$ absorption edge and half-integer diffraction. The strain from the lattice…
Polyacrylate/ZnO nanocomposite is developed by employing anionic polymer (PA30) as the surface modification agent via in situ emulsion polymerization. The modification effect of PA30 on ZnO particles was investigated. Scanning electron microscopy, thermogravimetric analysis, X-ray diffraction, and nuclear magnetic res…
The present research aimed to develop an edible coating incorporated with mint essential oil, evaluate its effectiveness in inhibiting in vitro microbial development, and improve both quality and shelf-life of fresh-cut pineapple. Mint essential oil-containing edible coatings showed in vitro antimicrobial efficiency a…
L-allo-Threonine aldolase (LATA), a pyridoxal-5'-phosphate-dependent enzyme from Aeromonas jandaei DK-39, stereospecifically catalyzes the reversible interconversion of L-allo-threonine to glycine and acetaldehyde. Here, the crystal structures of LATA and its mutant LATA_H128Y/S292R were determined at 2.59 and 2.50 Å…