Materials Literature
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Two types of liquid crystal (LC) gels with radial or twisted-radial molecular orientation are fabricated using a radial electric field generated by an indium-tin-oxide hole electrode in the bottom substrate. If the top substrate is not buffed, the radial-type LC gel is formed which can convert linearly polarized light…
The topological structure resulting from the network of contacts between grains ( contact network ) is studied for large samples of monosized spheres with densities (fraction of volume occupied by the spheres) ranging from 0.59 to 0.64. We retrieve the coordinates of each bead in the pack and we calculate the average…
Abstract A straightforward and reproducible synthesis of crack‐free large‐area thin films of 3D hexagonal ( R‐ 3 m ) mesostructured nanocrystalline titania (meso‐nc‐TiO 2 ) using a Pluronic triblock copolymer (P123)/1‐butanol templating system is described. The characterization of the films is achieved using a combina…
The artificial perovskite superlattices composed of LaMnO3 and SrMnO3 have been investigated to elucidate the interface electronic phases created by adjoining the two Mott insulators. Charge transfer at the interface due to chemical potential difference, as observed in p-n junctions of semiconductors, can realize meta…
A controllable left-handed metamaterial based on a varactor-loaded S-shaped resonator structure is presented to realize an active radome. By controlling the phase properties of the radome, the antenna exhibits continuous scanning capability in a range of ±40°, which is confirmed by theoretical analysis.
Twists and turns: ZnS nanohelices have been synthesized in high yield by using a simple vapor deposition process. These nanohelices also have Y-shaped branched secondary growths, which always point toward the inside of the helix. The formation of these hierarchical structures is discussed based on structural informati…
The authors propose a new structure of ZnO∕ZnMgO field-effect transistors (FETs) for demonstrating high-performance capability of ZnO-based FETs. A very thin (2nm) ZnMgO cap layer is used for forming a hetero-metal-insulator-semiconductor (hetero-MIS) gate structure together with a 50-nm-thick Al2O3 gate dielectric. T…
Magnetic tunnel junctions with a Co2MnSi∕Al–O∕CoFe structure are prepared by magnetron sputtering and investigated with respect to the energy gap near the Fermi energy level. The plasma oxidation time for the Al–O barrier is found to affect the condition of the Co2MnSi∕Al–O interface. The optimized sample (50s oxidati…
The authors use bilayer lipid membranes (BLMs) as a means to control the gating of organic electrochemical transistors (OECTs). Upon formation of a high quality BLM, the gating of an OECT can be fully suppressed. Gating is restored when gramicidin ion channels are incorporated into the BLM. The valence-dependent perme…
The formation and growth of helium bubbles due to self-irradiation in plutonium has been modelled by a discrete kinetic equations for the number densities of bubbles having $k$ atoms. Analysis of these equations shows that the bubble size distribution function can be approximated by a composite of: (i) the solution of…
A detailed investigation of ZnCr2Se4 is presented which is dominated by strong ferromagnetic exchange but orders antiferromagnetically at T_N = 21 K. Specific heat C and thermal expansion Delta L/L exhibit sharp first-order anomalies at the antiferromagnetic transition. T_N is strongly reduced and shifted to lower tem…
Based on first principles calculations, we show that $Mn$ impurities are magnetic in $MgB_{2}$ due to exchange-splitting of $d_{3z^2-1}$ band and they substantially modify $B$ $p_σ$ and $p_π$ bands through hybridization. Thus, $Mn$ impurities could act as strong magnetic scattering centers leading to pair-breaking eff…
We report on the transmission over a wide frequency range (from the far infrared through the visible) of pristine and hole-doped, free-standing carbon nanotube films at temperatures between 50 and $300\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. Optical constants are estimated by Kramers-Kronig analysis of the transmittanc…
Abstract A photoresponsive molecularly imprinted polymer (MIP) material is successfully fabricated from an azobenzene‐based functional monomer, 4‐[(4‐methacryloyloxy)phenylazo]benzoic acid (MPABA), using caffeine as a molecular template. The trans–cis photoisomerization properties of MPABA are retained after incorpora…
The effects of tetragonal strain on the electronic and magnetic properties of strontium-doped lanthanum manganite, La(2/3)Sr(1/3)MnO(3) (LSMO), are investigated by means of density-functional methods. As far as the structural properties are concerned, the comparison between theory and experiments for LSMO strained on…
We study the equilibrium properties of a model for a binary mixture of catalytically-reactive monomers adsorbed on a two-dimensional substrate decorated by randomly placed catalytic bonds. The interacting $A$ and $B$ monomer species undergo continuous exchanges with particle reservoirs and react ($A + B \to \emptyset$…
Time-resolved photoluminescence (PL) and micro-PL imaging were used to study single CdS nanowires at 10K. The low-temperature PL of all CdS nanowires exhibits spectral features near energies associated with free and bound exciton transitions, with the transition energies and emission intensities varying along the leng…
The magnetic and structural properties of MnAs are studied with ab initio methods and by mapping total energies onto a Heisenberg model. The stability of the different phases is found to depend mainly on the volume and on the amount of magnetic order, confirming previous experimental findings and phenomenological mode…
The focused ion beam microscope has been used to cut parallel-sided {100}-oriented thin lamellae of single crystal barium titanate with controlled thicknesses, ranging from $530\phantom{\rule{0.3em}{0ex}}\mathrm{nm}\phantom{\rule{0.3em}{0ex}}\text{to}\phantom{\rule{0.3em}{0ex}}70\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$…
Abstract Micelle‐templated silicas (MTSs) such as MCM‐41 and MCM‐48 feature unique textural properties owing to their uniform distribution of mesopores with tunable sizes. MTS synthesis is relevant to unique self‐assembly processes between surfactants and inorganic matter. The properties of MTSs have been explored in…