Materials Literature
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The structural and morphological changes occurring in an ensemble of vapor deposited palladium nanoclusters have been studied after several hydrogenation cycles with x-ray diffraction, extended x-ray-absorption fine structure spectroscopy, Rutherford backscattering spectrometry, and STM. Initial hydrogenation increase…
Thermoelectric elements (thermogenerators) with organic semiconductors or semimetals, respectively, are presented. To show the feasibility of such elements, in particular organic charge transfer salts and graphite powder as 'active' materials were investigated. These active materials were embedded in a PVC blend and s…
Our high pressure x-ray diffraction and Raman scattering studies on lanthanum hafnate $({\text{La}}_{2}{\text{Hf}}_{2}{\text{O}}_{7})$ establish that it decomposes into its constituent oxides beyond $\ensuremath{\sim}18\text{ }\text{GPa}$. These results are supported by our first-principles total energy calculations.…
Getting the grip on wires: Lead chalcogenide heterostructures, including alloy and core–shell nanowires were achieved by solution phase synthesis (see HRTEM image of a PbSe–PbTe core–shell nanowire). Structural control was gained by changing the growth parameters. The new heterostructures have a potential to provide b…
We show that effective superconducting orders generally emerge at low energy in the superconducting state of graphene with conventionally defined pairing symmetry. We study a particular interesting example, the ${d}_{{x}^{2}\ensuremath{-}{y}^{2}}+i{d}_{xy}^{\ensuremath{'}}$ spin singlet pairing state in graphene which…
Abstract We present ab initio calculation within the framework of the density‐functional theory (DFT) on band structure and vibrational properties of bulk V 2 O 5 . The structure of V 2 O 5 comes from optimization of the experimental data with lattice parameters fixed. The band structure of the optimized structure has…
This Article describes a unique approach to building silsesquioxane nanoassemblies based on the Langmuir−Blodgett (LB) technique. Poly( N -dodecylacrylamide- co -3-methacryloxypropyl-T8-heptatrifluoropropyl (or heptaphenylpropyl) POSS)s (p(DDA/SQ)s) were synthesized through free radical copolymerization using propyl m…
A molecular computing platform to defend against illegal information theft and invasion is obtained by the rational control of chemical reaction sequences in a newly prepared multiswitchable fluorophore 2-(4-aminophenylethylyl)-5-methoxy-2-(2-pyridyl)thiazole. Some of the fluorescent states with distinct recognition f…
Abstract Poly(bipyridine)ruthenium complexes with carboxylate anchor groups are key components in dye‐sensitised solar cells. In this contribution, an improved microwave‐assisted synthetic procedure is presented for the important building block [RuCl 2 (dcmb) 2 ] (dcmb = 4,4′‐dimethoxycarbonyl‐2,2′‐bipyridine), which…
The N-end rule is a degradation pathway conserved from bacteria to mammals that links a protein's stability in vivo to the identity of its N-terminal residue. In Escherichia coli, the components of this pathway directly responsible for protein degradation are the ClpAP protease and its adaptor ClpS. We recently demons…
Near-field focusing properties of zone plates are investigated in the visible regime by a 3-dimensional finite-difference time-domain method. It is shown that Frensel zone plates (FZPs) with metallic coatings can achieve subwavelength focusing in the visible wavelength. The characteristics of subwavelength focusing ar…
Abstract Signal enhancement observed in surface‐enhanced Raman spectroscopy (SERS) is attributable to the presence of noble‐metal nanostructures on substrate surfaces. The rational development of SERS‐active substrates depends critically on the homogeneity and intensity of surface plasmon resonances, properties that a…
High-resolution core-level shift spectroscopy and temperature-programmed reaction experiments together with density functional theory calculations reveal that the oxidation of HCl with oxygen producing Cl 2 and water proceeds on the chlorine-stabilized RuO 2 (110) surface via a one-dimensional Langmuir−Hinshelwood mec…
Activated carbons obtained from rice husk exhibit low specific surface areas when physical activation is applied due to its high silica content. The purpose of this work was to improve textural parameters of powdered activated carbons obtained from rice husk. To avoid the negative influence of the raw material ash con…
A new structure model (Hansen et al 2008 J. Phys.: Condens. Mater. 20 ) of ice Ic, so-called ‘cubic ice’(König 1943 Z. Kristallogr. 105 279), allows the description of the complex diffraction pattern in terms of stacking fault probabilities and anisotropic particle size. To understand the successive transitions when g…
We report the polarized Raman spectra of undoped $R\mathrm{FeAsO}$ ($R$=Sm, La) collected at room temperature from $ab$ surfaces of impurity-free microcrystals. The spectra exhibit sharp phonon lines on very weak electronic scattering background. The frequency and symmetry of the four Raman phonons involving out-of-pl…
We study the stability of orientationally disordered crystal phases in a suspension of colloidal hard dumbbells using Monte Carlo simulations. For dumbbell bond length L/sigma<0.4 with L the separation of the two spheres of the dumbbell and sigma the diameter of the spheres, we determine the difference in Helmholtz fr…
Nanodiamond (ND) particles were functionalized with V-shaped polymer brushes of polystyrene and poly( t -butyl methacrylate) (P t BMA) through the reaction of surface carboxylic groups of NDs toward epoxy functionalities located in the middle of the polymer precursor, an ABC-type triblock copolymer. The block copolyme…
Ice Ic, so-called 'cubic ice' (König 1943 Z. Kristallogr. 105 279–86), can be obtained, for example, from direct vapour deposition at low temperatures or by warming of recovered high-pressure forms of ice. It is usually obtained in the form of very small crystallites, leading to particle size broadening of the diffrac…
Phase-change memory, which switches reversibly between crystalline and amorphous phases, is promising for next generation data-storage devices. In this work, we present a novel, nonbinary data-storage device using core-shell nanowires to significantly enhance memory capacity by combining two phase-change materials wit…