Materials Literature
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From recent Hall effect measurements and angle-resolved photo-emission spectroscopy the interesting picture emerges of co-existing hole- and electron-like quasiparticle bands, both in electron- and hole-doped superconducting cuprates. We reflect on the idea that bosonic electron-hole pairs may be formed in the cuprate…
The 120\ifmmode^\circ\else\textdegree\fi{} ordered antiferromagnetic state of the Hubbard model on a triangular lattice presents an interesting case of $U$-controlled competing interactions and frustration. The spin stiffness is found to vanish at $U\ensuremath{\approx}6$ due to competing spin couplings generated at f…
SiC nanowires (NWs) reinforce SiC matrix composites with high efficiency. With the incorporation of ∼ 6 vol.-% randomly oriented single-crystal SiC NWs in the matrices, the fracture toughnesses and flexural strengths of the composites doubled. The composites (see Figure) were fabricated in situ by a new process based…
We report the writing of very high resolution tungsten containing dots in regular arrays by electron beam-induced deposition (EBID). The size averaged over 100 dots was 1.0 nm at fwhm. Because of the statistical spread in the dot size, large and small dots are present in the arrays, with the smallest having a diameter…
Crystalline hexagonal-shaped superstructures of calcium carbonate, synthesized in the presence of ammonia, are shown to be assembled by a three-dimensional oriented attachment of vaterite nanoparticles. This unusual crystallographic lock-in mechanism enables the formation of complicated rounded structures with a cryst…
A fully inorganic analogue of the nanostructured dye-sensitized solar cell is fabricated using an electrochemically grown n-ZnO/CdSe core–shell nanowire array (see Figure). Filling the voids between the nanowires with p-type wide-bandgap CuSCN by a solution-deposition technique leads to an extremely thin solar cell ex…
The effect of citric acid and 1,2-dihydroxybenzene 3,5-disulfonic acid (DHBDSA), as additives, on the crystallization of gypsum was studied under simulated conditions of the of phosphoric acid production. Calcium hydrogen phosphate and sulfuric acid were mixed with dilute phosphoric acid at 80 °C, and the turbidity of…
Abstract The chemical modification of maritime pine sapwood ( Pinus pinaster Soland) with 3-isocyanatopropyltriethoxysilane (IPTES) and its subsequent hydrolysis were investigated. The formation of urethane linkages after the carbamoylation reaction was confirmed by Fourier-transform infrared (FTIR) spectroscopy. The…
A micro-encoder based on higher-order diffracted light interference has been developed for use in high-precision positioning. It uses ±3-order diffracted beams to obtain interference fringes for displacement detection and provides six signal periods for moving the scale grating by one grating period (3.2 µm) without a…
Abstract Metal‐containing polymers are obtained by grafting commercial poly(4‐vinylpyridine) (average molecular weight 60000 or 160000) with a Ni II chromophore complex. The metal‐containing chromophore was obtained from a tridentate benzoylhydrazine ligand. Chromophore fragments were grafted onto the polymer by forma…
We made use of the Raman spectroscopy to investigate the mechanism of hydrogen adsorption on carbon materials. We have recorded the Raman active roto-vibrational $Q$ branch of adsorbed hydrogen at various temperatures and pressures and we have developed a qualitatively theoretical model for the interpretation of the s…
Porosity-induced birefringence in a GaP membrane is studied using a method based on the analysis of beats in unpolarized and polarized transmittance spectra as well as in angular dependence of optical spectra. Birefringence as high as n e − n o = 0.25 was measured in a porous GaP membrane with the degree of porosity c…
Diamonds containing nitrogen in different forms have been irradiated by $3\text{--}\mathrm{MeV}$ electrons or $^{60}\mathrm{Co}$ gamma photons and characterized by optical absorption (OA) and electron spin resonance (ESR). An unusually low production rate of vacancies $(V)$ and interstitials $(I)$ was observed in gamm…
Abstract The effect of Co doping on the magnetic and transport properties of La 0.7 Sr 0.3 Mn 1– x Co x O 3 (0 ≤ x ≤ 0.5) is investigated. The Co doping at Mn sites dilutes the double‐exchange interaction between Mn 3+ and Mn 4+ ions and changes the long‐range ferromagnetic (FM) order of La 0.7 Sr 0.3 MnO 3 (LSMO) to…
A new nonlinear optical material L-arginine maleate dihydrate, C6H14N4O2,C4H4O4,2H2O (LAMD) was synthesized and single crystals were grown by slow cooling and also by slow evaporation method at constant temperature from its aqueous solution. Quality and size of the crystals are found to be dependent on pH of the solut…
A system of classical charged particles confined in a two-dimensional trap and interacting through a competing short-range attraction and long-range repulsion potential is studied. The structure of the system strongly depends on the interaction range of the short-range attraction potential and the total number of part…
A star in the making: Star-shaped block copolymers have been synthesized by reversible addition–fragmentation chain-transfer (RAFT) polymerization to obtain light-harvesting systems with an energy gradient from the periphery to the core. Excitation-energy transfer in the block copolymers occurs through an energy casca…
Abstract Summary: The relatively high degree of crystallinity of a new thermoplastic polyimide (PI) makes it a favorable matrix candidate for fiber reinforced composites. This advantage is the result of the ability of the matrix to recrystallize during the composite manufacturing process. In this study we examine the…
A description of a modified crystallizer for growing large crystals from solutions along with the design of a versatile electronic reciprocating control system to change and reciprocate the motor speed containing the seed holding rod for solution growth crystallizer is presented. In this system, rotation rate and numb…
In order to function in vivo, tissue engineered blood vessels (TEBVs) must encumber pulsatile blood flow and withstand hemodynamic pressures for long periods of time. To date TEBV mechanical assessment has typically relied on single time point burst and/or uniaxial tensile testing to gauge the strengths of the constru…