Materials Literature
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Complex borohydrides have been studied as candidate materials for vehicular hydrogen storage. In particular, M(BH 4 ) 2, where M = Mg or Ca, has received considerable attention because of its high gravimetric capacity for H 2 . Experimental observations indicate an initial decomposition reaction: 6M(BH 4 ) 2 → 5MH 2 +…
The authors report on high quality ZnCdO alloy epilayers and ZnCdO/ZnO single quantum well structures on sapphire substrates by pulsed laser deposition. The Cd concentration in the ZnCdO alloy can be systematically adjusted via the substrate temperature and single-phase ZnCdO alloy with a band gap at room temperature…
The Pd doped amorphous carbon (a-C:Pd) films were deposited on n-Si substrates with or without a native SiO2 layer using magnetron sputtering. The photovoltaic characteristics of the a-C:Pd/SiO2/Si and a-C:Pd/Si junctions were studied. It is found that under light illumination of 15 mW/cm2 at room temperature, the a-C…
Elastic neutron-scattering studies of single-crystal LaFeAsO reveal that upon cooling, an onset of the tetragonal (T)-to-orthorhombic (O) structural transition occurs at ${T}_{\text{S}}\ensuremath{\approx}156\text{ }\text{K}$, and it exhibits a sharp transition at ${T}_{\text{P}}\ensuremath{\approx}148\text{ }\text{K}…
Broadband dielectric relaxation studies were performed on D-glucose and 1,6-anhydro-D-glucose. In the liquid phase of both systems, one can observe the cluster relaxation and structural relaxation. In the glassy state of D-glucose two secondary relaxations were recorded. The slower one, hardly detectable in the loss s…
Thermal boundary conductance (TBC) is a performance determinant for many microsystems due to the numerous interfaces contained within their structure. To assess this transport, theoretical approaches often account for only the acoustic phonons as optical modes are assumed to contribute negligibly due to their low grou…
The electrical properties of Ca-doped BaTiO3 are very different when Ca substitutes onto Ba or Ti sites. The p-type semiconductivity of Ti-substituted ceramics increases reversibly by one to two orders of magnitude under a dc-bias voltage of ≤100 V cm−1, whereas Ba-substituted ceramics show little sensitivity to a dc…
Although glassy relaxation is typically associated with disorder, here we report on a new type of glassy dynamics relating to dislocations within 2D crystals of colloidal dimers. Previous studies have demonstrated that dislocation motion in dimer crystals is restricted by certain particle orientations. Here, we drag a…
The first structurally authenticated linear, homoleptic triple-decker sandwich complex of an f-element, (η 8 -COT′′)Nd(μ-η 8:η 8 -COT′′)Nd(η 8 -COT′′) ( 2; COT′′ = [C 8 H 6 (SiMe 3 ) 2 -1,4] 2− ) has become available through a rather unexpected synthetic pathway. Treatment of [Li(THF) 4 ][Nd(COT′′) 2 ] ( 1 ) with anhy…
A cholesterol-functional trithiocarbonate reversible addition–fragmentation chain transfer (RAFT) agent was synthesized and employed to generate well-defined poly(polyethylene glycol) acrylate with cholesterol chain termini using RAFT polymerization. Subsequently, the polymers were grafted onto the surface of gold nan…
The far- and near-field properties of Au/Ag alloy nanoshell have been investigated by using Mie theory. With increasing Au content in shell, the dipole peak of alloy nanoshell shows a redshift from that of Ag nanoshell to that of Au nanoshell. It is found that the effect of the variation in shell thickness on the near…
Carbon diffusion near the core of a $[111](\overline{1}01)$ edge dislocation in $\ensuremath{\alpha}$-iron has been investigated by means of an atomistic model that brings together molecular statics and atomistic kinetic Monte Carlo (AKMC). Molecular statics simulations with a recently developed embedded atom method p…
This work presents a detailed evaluation of the performance of density functional theory (DFT) for the prediction of zero-field splittings (ZFSs) in high-spin nitrenes. A number of well experimentally characterized triplet mononitrenes, quartet nitrenoradicals, quintet dinitrenes, and septet trinitrenes have been cons…
Chemical control of surface functionality and topography is an essential requirement for many technological purposes. In particular, the covalent attachment of monomeric proteins to surfaces has been the object of intense studies in recent years, for applications as varied as electrochemistry, immuno-sensing, and the…
The one- (OPA) and two-photon (TPA) absorption spectra have been calculated for a gold dimer, for a monothiolated gold dimer anion, for a thiolated gold cluster [Au25(SH)18](-1), whose structure has been determined, and for a proposed cluster [Au12(SR)9](+1) using time-dependent density functional theory (TDDFT). Geom…
Significantly large inverse magnetic entropy changes (ΔSM) and magnetoresistance (MR) were observed at the inverse martensitic phase transitions of the Ga-based magnetic shape memory Heusler alloys: Ni50−xCoxMn32−yFeyGa18. The crystal structures of alloys were tetragonal at 300 K and the phase transition temperatures…
Self-assembling cyclic peptide-polymer conjugates were prepared by ‘clicking’ polymers (prepared by RAFT polymerization) to an azide functionalized d-alt-l cyclic octapeptide via the Huisgen 1,3-dipolar cycloaddition reaction. Due to the high graft density, the efficiency of the click chemistry conjugation reaction wa…
We outline a concept of self-assembled soft matter devices based on micro-fluidics, which use surfactant bilayer membranes as their main building blocks, arrested in geometric structures provided by top-down lithography. Membranes form spontaneously when suitable water-in-oil emulsions are forced into micro-fluidic ch…
MgAl hydrotalcites, or layered double hydroxides (LDHs), with different Mg/Al molar ratios were synthesized by the coprecipitation method. The structure of the solids was collapsed by thermal treatment at 723 K obtaining MgAl mixed oxides with high specific surface areas (264−318 m 2 /g). When these oxides were put in…
The current knowledge of the physics of electromagnetic cloaking of material objects by the wave flow method is reviewed. Experiments demonstrating the feasibility of this cloaking method are described. Some aspects of calculating cloak profiles are examined, and achievements and unsolved problems in the theory of the…