Materials Literature
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Electrical transport measurements through single InAs and CdSe semiconductor nanocrystals embedded in a thin polymer film were performed using conductance atomic force microscopy. The current and topography images showed excellent correlation, where current was detected only over the nanocrystals. A rapid current deca…
A simple and effective method for the self‐assembling of thin films with directional ordering perpendicular to the substrate surface (see Figure) is reported. These films are grown on amorphous glass substrates and show second‐order nonlinear optical effects of the order of 5 pm V –1 . The ordering in these films can…
The heat capacity of a halogen-bridged quasi-one-dimensional (Q1D) mixed-valence binuclear metal complex (the so-called MMX chain), Pt 2 ( n -PrCS 2 ) 4 I, was measured by adiabatic calorimetry. A higher order phase transition due to structural disorder was observed at 209 K. Another first-order phase transition havin…
Magnetization studies have been carried out on a single crystal of TbBaCo 2 O 5.5 in the temperature range 2–350 K and magnetic fields up to 50 kOe. Several spontaneous magnetic phase transitions have been observed and analysed in both Co ( T C = 277 K, T N1 = 210 K) and Tb ( T N2 = 3.44 K) subsystems. It is shown tha…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTSynthesis of Novel Metal Sulfide−Polymer Composite Microspheres Exhibiting Patterned Surface StructuresChaoliang Bai, Yu Fang, Ying Zhang, and Beibei ChenView Author Information School of Chemistry and Materials Science, Shaanxi Normal University, Xi'an 710062, People's Republi…
In this paper, In2O3 nanocrystals were prepared by solution dispersion from bulk indium. In2O3 nanocrystals with an average diameter of 30 nm have a single-crystalline phase and appear as a square or rhombohedral shape, and little spherical particles are also present. In addition, these nanocrystals show strong ultrav…
The origin of the slow relaxation and of the dynamic heterogeneity is studied for an orientation-ally disordered crystal, orthocarborane, composed of quasi-icosahedrally shaped molecules. Multidimensional deuteron magnetic resonance reveals that large jump angles dominate their complex, anisotropic reorientational mot…
The inherent chromonic lyotropic liquid crystalline properties of a dye have been manipulated to fabricate multi-axial micropolarizing thin films by means of the photoalignment technique. The dye aqueous solution is deposited on a photopatterned polymer film to result in the macroscopic alignment of the dye molecules,…
Abstract A novel, fluorinated diamine monomer with the ether–ketone group, 4,4′‐bis(4‐amino‐2‐trifluoromethylphenoxy)benzophenone ( 2 ), was prepared through the nucleophilic substitution reaction of 2‐chloro‐5‐nitrobenzotrifluoride and 4,4′‐dihydroxybenzophenone in the presence of potassium carbonate, followed by cat…
Layered double hydroxides (LDHs, or hydrotalcites) with Mg(2+) and Al(3+) cations in the mixed metal hydroxide layer and paratungstate anions in the interlayer have been prepared. Different methods have been followed: anion exchange with Mg,Al LDHs originally containing nitrate or adipate, reconstruction of the LDH st…
The crystal and magnetic structure of strontium ferrite Sr 4 Fe 4 O 11 (SrFeO 2.75 ) has been investigated using neutron powder diffraction and magnetic susceptibility measurements over the temperature range 1.5–293 K and by Mössbauer spectroscopy at room temperature. Sr 4 Fe 4 O 11 is orthorhombic (symmetry group Cmm…
A high‐quality (0001)‐oriented ZnO layer that emits ultraviolet light at room‐temperature has been prepared by electrodeposition on a (111) Au/(100) Si substrate. The ZnO layer emits ultraviolet light at a photon energy of around 3.3 eV due to the recombination of bound excitons and visible light at 2.34–2.8 eV at roo…
Pristine arc-produced multi-walled carbon nanotubes are contacted to liquid mercury in situ in a transmission electron microscope. The conductance G ( V ) for all tubes increases with increasing bias voltage V . This is related to the electronic density of the nanotubes. Similar G ( V ) behaviour is observed for HOPG-…
We report on a molecular dynamics study of the cross-plane lattice thermal conductivity in GaAs/AlAs superlattices. The layers of the superlattice are modelled by a three-dimensional face centred cubic lattice with cubic anharmonicity, and with atomic scale roughness at the interfaces. We perform the simulation of hea…
A study of crystal structure, elastic, and magnetic properties of low-doped Nd 1− x Ca x MnO 3 ( ) perovskites has been carried out. The ferromagnetic component is shown to increase under hole doping and, simultaneously, the temperature of the orbital order–disorder phase transition decreases. The mechanism of the con…
The infrared spectra of the metcars ${X}_{8}{\mathrm{C}}_{12}$ with $X=\mathrm{V},$ Nb, Zr, in the gas phase, recently determined experimentally using the infrared resonance enhanced multiphoton ionization technique, are computed from first-principles for several of the lowest-energy local minima found for these clust…
Binding of a poly(amido amine) dendrimer with salmon testes DNA in an aqueous solution of 0.01 M NaCl at pH 6.5 has been investigated. It was shown from the physicochemical experiments of static light scattering and ultra-violet and circular dichroism spectroscopy that at a 0.2 mixing ratio of dendrimer/DNA (number ra…
Effects of organic additives, such as benzoic acid (BA) and poly(ethylene glycol)s (PEGs), on the initial stage of the zinc electrodeposition have been investigated at iron electrodes using cyclic voltammetry, electrochemical quartz crystal microbalance measurements and in situ electrochemical scanning tunneling micro…
Abstract The formulation and finite element implementation of a finite deformation continuum theory for the mechanics of crystalline sheets is described. This theory generalizes standard crystal elasticity to curved monolayer lattices by means of the exponential Cauchy–Born rule. The constitutive model for a two‐dimen…
An expansion method for perturbation of the zero temperature grand canonical density matrix is introduced. The method achieves quadratically convergent recursions that yield the response of the zero temperature density matrix upon variation of the Hamiltonian. The technique allows treatment of embedded quantum subsyst…