Materials Literature
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We report the sonochemical synthesis of copper(I) hydride (CuH) by the ultrasonic irradiation of a copper(II) aqueous solution. A reaction mechanism based on the reduction of copper(II) by the ultrasound-generated hydrogen atoms is discussed. To the best of our knowledge, this is the first time that a metal hydride ha…
Abstract The treatment of free‐standing sheets of multiwalled carbon nanotubes (MWNTs) with a NH 3 /He plasma results in self‐supporting sheets of aligned N‐doped MWNTs (CN x ). These CN x sheets can be easily twist spun in the solid state to provide strong CN x yarns that are knottable, weavable, and sewable. The CN…
We propose an original approach for creating tunable electromagnetic metamaterials. We demonstrate experimentally that magnetic resonance of a split-ring resonator (“meta-atom” of a composite material) with a photodiode operated in photovoltaic mode can be tuned by changing the intensity of an external light source. M…
A range of fluoride-encapsulated octasilsesquioxane cage compounds have been prepared using the TBAF route. Our studies suggest that whilst it is relatively straightforward to prepare fluoride-encapsulated octasilsesquioxane cage compounds with adjacent sp(2) carbons, leading to a range of aryl and vinyl substituted c…
A chromophore featuring a diyne bridge that connects two dibromobenzene moieties shows a much improved two-photon singlet oxygen generation ability in the biological transparency window compared to a related and relevant literature benchmark, as a result of a distorted ground state.
The self-retracting motion of a graphene flake on a stack of graphene flakes is studied using molecular dynamics simulations. It is shown that in the case when the extended flake is initially rotated to an incommensurate state, there is no barrier to the self-retracting motion of the flake and the flake retracts as fa…
Using nonequilibrium molecular dynamics simulations, we show if a multi-walled carbon nanotube (MWNT) is heated asymmetrically, an evident thermal rectification can be detected. We attribute the observed rectification to the asymmetric radial thermal transport between constructing layers in MWNT. The underlying physic…
Films and coatings were produced from a noncellulosic polysaccharide-rich wood hydrolysate (WH), and the resulting oxygen barrier performance was improved by a selective choice of upgrading conditions. The WH was obtained from process water in the hydrothermal treatment of hardwood and subjected to one of three altern…
Catalyzing magnesium hydride by 5 mol % titanium fluoride is observed to have a pronounced impact on the materials nanoscaling and the thermodynamics of H sorption. Surprisingly small ∼30 nm MgH 2 crystallites result after hydrogen uptake, which are apparently stabilized by abundant interface interactions, arresting O…
In-situ flow alignment kinetics of a self-assembled lamellar phase polystyrene- block -polyisoprene (PS- b -PI, M w = 26 500 g/mol, f PS = 51%) diblock copolymer melt has been investigated in detail under mechanical large amplitude oscillatory shear (LAOS) utilizing a unique Rheo–SAXS combination developed in cooperat…
Cobalt hydroxide (β-Co(OH)2) thin film supercapacitors are developed for the first time via screen printing and their potential application towards energy storage (as an electrode material within a supercapacitor) explored. The highly uniform, porous nanostructures were synthesized via a novel, hydrothermal, template-…
The occurrence of the long-range magnetic order of high-spin Fe${}^{3+}$ ions is found in iron-containing langasite family crystals ${A}_{3}M$Fe${}_{3}$${X}_{2}$O${}_{14}$ ($A$ = Ba, Sr; $M$ = Sb, Nb, Ta; $X$ = Si, Ge) at $T$ \ensuremath{\le} 40 K. The Neel temperature (${T}_{\mathrm{N}}$) values (27.1--37.1 K) depend…
The pyrolysis and flame retardancy of a bisphenol A polycarbonate/silicon rubber/bisphenol A bis(diphenyl phosphate) (PC/SiR/BDP) blend were investigated and compared to those of PC/BDP and PC/SiR. The impact modifier SiR consists mainly of poly(dimethylsiloxane) (PDMS > 80 wt %). The pyrolysis of PC/SiR/BDP was studi…
Proceedings of the National Academy of Sciences (PNAS), a peer reviewed journal of the National Academy of Sciences (NAS) - an authoritative source of high-impact, original research that broadly spans the biological, physical, and social sciences.
Fundamental proximity effects for electron beam induced deposition processes on nonflat surfaces were studied experimentally and via simulation. Two specific effects were elucidated and exploited to considerably increase the volumetric growth rate of this nanoscale direct write method: (1) increasing the scanning elec…
Bulk oxyfluoride glasses co-doped with Ag nanoclusters and Yb3+ ions have been prepared by a melt quenching technique. When excited in the absorption band of the Ag nanoclusters between 300 to 500 nm, these glasses emit a broad band characteristic of the Ag nanoclusters between 400 to 750 nm as well as an emission ban…
A novel hybrid spectroscopic technique is proposed, combining surface plasmon resonance (SPR) with surface-enhanced Raman scattering (SERS) microscopy. A standard Raman microscope is modified to accommodate the excitation of surface plasmon-polaritons (SPPs) on flat metallic surfaces in the Kretschmann configuration,…
Composites of poly(lactic) acid (PLA) reinforced with TEMPO-oxidized fibrillated cellulose (TOFC) were prepared to 15, 20, 25, and 30% fiber weight fractions. To aid dispersion and to improve stress transfer, we acetylated the TOFC prior to the fabrication of TOFC-PLA composite films. Raman spectroscopy was employed t…
Uniform single-crystalline hexagonal-shaped Sb2Te3 nanoplates with a thickness of 30–40 nm have been successfully synthesized by a glucose-assisted solvothermal process in the mixed solvents of ethanediamine and water. It is found that the reaction time, concentration of glucose, reaction temperature and the volume ra…
We obtain and analyze the phase diagram of doped iron pnictides under the assumption that doping adds nonmagnetic impurities to the system but does not change the densities of carriers. We show that the phase diagram is quite similar to the one obtained under the opposite rigid band assumption. In both cases, there is…