Materials Literature
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Dense alumina ceramics have been fabricated by the colloidal shaping of alumina slurry using methylcellulose as the networking additive. Concentration as low as 0.08 wt% of methylcellulose had been found to be sufficient enough to convert an alumina slurry of 74–75 wt% solid loading, to consolidated shapes by thermal…
How exciting! A combined experimental and theoretical study of the surface-enhanced hyper-Raman scattering (SEHRS) provides a detailed picture of the electronic excited state of the benchmark Rhodamine 6G molecule (see picture). These results demonstrate the ability of SEHRS to explore excited states that are not easi…
Here we demonstrate a novel technique to grow carbon nanotubes (CNTs) on addressable localized areas, at wafer level, on a fully processed CMOS substrate. The CNTs were grown using tungsten micro-heaters (local growth technique) at elevated temperature on wafer scale by connecting adjacent micro-heaters through metal…
Low-coordinate first-row metal complexes of d(0) [vanadium(V)], d(1) [chromium(V)], and d(2) [chromium(IV)] assume the unusual ligand field of a pseudotetrahedron when supported by a tripodal tBu(2)(Me)CO(-) alkoxide framework. Structural, spectroscopic, and reactivity studies, supported by density functional theory c…
Acetonitrile is a choice of solvent for almost all chromatographic separations. In recent years, researchers around the globe have faced an acetonitrile shortage that affected routine analytical operations. Researchers have tried to counter this shortage by applying many innovative solutions, including using ultra per…
In an attempt to utilize ozone effectively, a series of praseodymium-modified γ-Al 2 O 3 (Pr/Al 2 O 3 ) was prepared via incipient wetness impregnation using Pr(NO 3 ) 3 ·6H 2 O as the precursor. The structure and properties of the catalysts were studied by X-ray diffraction (XRD) and the Brunauer−Emmett−Teller (BET)…
Biodegradable tri-component graft copolymers, chitosan-poly(ε-caprolactone)-poly(ethylene glycol) (CPP), were synthesized via a mild route, using sodium dodecyl sulfate-chitosan complex (SCC) as a precursor. Both PCL and PEG could be conveniently conjugated to the hydroxyl sites of chitosan without the need of tedious…
Abstract The direct vapor‐phase production of propylene oxide (PO) from propylene and molecular oxygen without the use of a co‐reactant remains a challenging problem in industrial catalysis, in spite of several decades of research. Herein, the discovery of a new class of silica‐supported multimetallic RuO 2 –CuO x –Na…
We show that the quasi-one-dimensional organic ferromagnet 2-benzimidazolyl nitronyl nitroxide (2-BIMNN) undergoes a phase transition to long-range magnetic order below ${T}_{\text{C}}=1.0(1)\text{ }\text{K}$. The intrachain exchange interactions are $J/{k}_{\text{B}}=22\text{ }\text{K}$ and so the low-temperature ord…
Graphene grown by chemical vapor deposition and supported on SiO2 and sapphire substrates was studied following controlled introduction of defects induced by 35 keV carbon ion irradiation. Changes in Raman spectra following fluences ranging from 1012 cm-2 to 1015 cm-2 indicate that the structure of graphene evolves fr…
Tm 3+ -, Tb 3+ - and Eu 3+ -doped ZrO 2 nanocrystals were prepared by a facile precipitation method with a hydrothermal process. Structural characterization showed a crystallite size ranging from 30 to 40 nm, and monoclinic and tetragonal zirconia phases were observed depending on the dopant concentration. The monocli…
Abstract Ultra‐thin free‐standing nanoporous gold leaf made by dealloying exhibits excellent electrocatalytic activities toward nitrite oxidation. The electrochemical responses of nitrite ions on this novel nano‐electrode is found not dependent on pH over a wide range from 4.5 to 8.0, which is markedly different from…
The goal of this study was to generate porous scaffolds from the genetically engineered protein, an analogue of Nephila clavipes spidroin 1 (rS1/9) and to assess the properties of new rS1/9 scaffolds essential for bioengineering. The salt leaching technique was used to make the rS1/9 scaffolds of interconnected macrop…
We consider a one-dimensional (1D) superlattice (SL) on graphene consisting of very high and very thin (δ-function) magnetic and potential barriers with zero average potential and zero magnetic field. We calculate the energy spectrum analytically, study it in different limiting cases, and determine the condition under…
The effects of ZnO on longitudinal and transverse ultrasonic wave velocities of soda lime silicate (SLS) glasses have been measured using the pulse-echo method at 5 MHz frequency at room temperature. The elastic properties: Longitudinal modulus, shear modulus, Young's modulus, bulk modulus, Poisson's ratio, and Debye…
On the surface of it: Experimental and computational analyses for a hybrid peptide–substrate system showed that changing the position of a proline residue in synthetic peptides changes their adsorption onto semiconductors substantially and predictably (see picture with a Si(100) surface). Such information is essential…
We study single wall carbon nanotubes (SWNTs) deposited on quartz. Their Raman spectrum depends on the tube-substrate morphology, and in some cases, it shows that the same SWNT-on-quartz system exhibits a mixture of semiconductor and metal behavior, depending on the orientation between the tube and the substrate. We a…
Spherulitic crystals are found in association with many materials and diseases, but the fundamental formation mechanism is not well understood. Using maleic chitosan to control CaCO 3 crystallization, we have discovered a two-stage process that produces biomimetic CaCO 3 spherulites. First, amorphous calcium carbonate…
We explored the size-dependent impairment of cognition in mice caused by the injection of gold nanoparticles (GNPs). GNPs of 17 and 37 nm in diameter were injected intraperitoneally into BALB/c mice at doses ranging from 0.5 to 14.6 mg kg( - 1). ICP-MS was performed on brain tissue collected 1, 14 and 21 days after th…
Long alkyl groups are used in many functional polymers to improve their performance. The methylene sequences usually show a strong tendency to aggregate to form small alkyl nanodomains which can be either completely amorphous or partly crystalline. The influence of main chain packing, domain size, and density on the p…