Materials Literature
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Prevailing opinion suggests that only substances up to 64 nm in diameter can move at appreciable rates through the brain extracellular space (ECS). This size range is large enough to allow diffusion of signaling molecules, nutrients, and metabolic waste products, but too small to allow efficient penetration of most pa…
We describe the development of novel and biocompatible core/shell (α-NaYbF(4):Tm(3+))/CaF(2) nanoparticles that exhibit highly efficient NIR(in)-NIR(out) upconversion (UC) for high contrast and deep bioimaging. When excited at ~980 nm, these nanoparticles emit photoluminescence (PL) peaked at ~800 nm. The quantum yiel…
Addition of alkali metal ions significantly promotes the activity of the Pt/TiO2 catalyst for the HCHO oxidation reaction by stabilizing an atomically dispersed Pt-O(OH)x alkali metal species and opening a new low-temperature reaction pathway. The atomically dispersed Na-Pt-O(OH)x species can effectively activate H2O…
Graphene, a single layer of carbon atoms in a honeycomb lattice, offers a number of fundamentally superior qualities that make it a promising material for a wide range of applications, particularly in electronic devices. Its unique form factor and exceptional physical properties have the potential to enable an entirel…
The crystal structure of an extremely thermostable UDP-glucose dehydrogenase (UDP-GDH) from the hyperthermophilic archaeon Pyrobaculum islandicum was determined at a resolution of 2.0 Å. The overall fold was comprised of an N-terminal NAD(+) dinucleotide binding domain and a C-terminal UDP-sugar binding domain connect…
In recent years, with growing contradiction between energy supply and demand, the more and more high demand of the environmental protection is needed. The work represented an environment friendly method for recycling of waste rubber and pulp sediment that a new composite material was prepared using pulp sediment as th…
Rothischildia lebeau which belongs to the Saturniidae family of silk-producing insects secretes protein fibers with properties between that of the Bombyx mori and the common wild silks. Traditionally, wild silks produced by insects such as Antheraea mylitta are considerably coarser and have inferior tensile properties…
A series of novel self-colored blue waterborne polyurethanes (BPUs) were successfully synthesized by incorporating a self-made colored diol 1,4-bis(2-hydroethylamino)anthrancene-9,10-dione (BHAD) into the polyurethane backbone via step growth polymerization. FTIR, 1H NMR, ultraviolet-visible (UV-vis) spectroscopy were…
Alumina coatings embedded with different nanoadditives were fabricated on aluminium alloy by microarc oxidation (MAO). Incorporation of nanograins into the prepared coatings was accomplished by dispersing nanoadditives into different electrolytes during the MAO process. Our results show that nanograins are successfull…
Medicinal plants are the oldest source of pharmacologically active compounds and provided virtually the only source of medicinally useful compounds for centuries. They contain physiologically active principles that over the years have been exploited in traditional medicine for the treatment of various ailments. The in…
Abstract A new series of Y‐type polyurethanes containing different concentrations of nonlinear optical (NLO) chromophore with aniline donor and tricyanofurane (TCF) acceptor have been successfully prepared, and characterized by FTIR, UV‐Vis, and 1 H‐NMR spectra. New polyurethanes were synthesized with different chromo…
Ten new quaternary ammonium salts (QASs) were designed and synthesized from hydrolyzed fatty oils; the hydrolyzed oils were used as a source of alkyl halides to prepare the QASs by refluxing the fatty alkyl halide with ethoxylated amines as untraditional 3° amines in acetone. The structure of the prepared QASs were ch…
Adipic acid (AA) is one of the most important commercially available aliphatic dicarboxylic acids, which has a large industrial application in the manufacture of Nylon-6 and Nylon-66. The present work demonstrated a green chemistry route for the direct oxidation of cyclohexane (CH) to AA using supported nano-gold cata…
Polypropyleneimines (PPIs) functionalized by glycerol-based entities are prepared and characterized by diffusion-ordered spectroscopy NMR. Showing low cytotoxicity against MRC5 fibroblasts, their encapsulation capacities of gadolinium complexes was evaluated. T(1) measurements were performed to determine the relaxivit…
Dielectric behavior was examined for nanodomain-forming styrene–isoprene (SI) diblock and SIIS triblock copolymers, the former having type-A dipoles aligned along its I block, whereas the latter being the head-to-head dimer of the former and having the dipoles inverted at the midpoint of the middle II block. The slow…
De Haas-van Alphen oscillations of the organic metal θ-(ET)4ZnBr4(C6H4Cl2) are studied in pulsed magnetic fields up to 81 T. The long decay time of the pulse allows determining reliable field-dependent amplitudes of Fourier components with frequencies up to several kiloteslas. The Fourier spectrum is in agreement with…
The spatial fluctuations of the dynamics of a colloidal system composed of nanoparticles are probed by a novel experimental setup, which combines homodyne and heterodyne dynamic light scattering focused onto a micron-sized volume via a microscope objective. The technique is used to measure the four-point susceptibilit…
Photoluminescence and nonlinear optical properties of CdTe/CdS core/shell quantum dots (QDs) have been investigated in this work. X-ray diffraction analysis demonstrated cubic crystalline structure for synthesized QDs with an average size around 8 nm. Transmission electron microscope image indicated spherical core/she…
Carbon fiber reinforced plastic composite materials have unique mechanical properties and could substitute aluminum alloys used in harsh environments. We performed high-speed impact experiments to study carbon fiber reinforced plastic fracture behavior at cryogenic temperatures for two specimens of different laminated…
Semi-active structural elements based on variable stiffness represent a promising approach to the solution of the conflict of requirements between load-carrying capability and shape adaptivity in morphing lightweight structures. In the present work, a structural concept with adaptive bending–twist coupling aiming at a…