Materials Literature
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A uniform diamond nanocone array was formed by plasma etching of diamond film in a hot filament chemical vapor deposition (HFCVD) system. A surface amorphous carbon coating layer, which is formed during CH4/H2 plasma-etching process, was removed by Ar plasma in a reactive ion etching system. The hydrogenation of diamo…
We report the observation of superstructures associated with the oxygen 2p states in two prototypical manganites using x-ray diffraction at the oxygen K edge. In the stripe order system Bi0.31Ca0.69MnO3, hole-doped O states are orbitally ordered, at the same propagation vector as the Mn orbital ordering, but no oxygen…
The aim of this paper is to give a short review on cluster dynamics modeling in the field of atoms and point defects clustering in materials. It is shown that this method, due to its low computer cost, can handle long term evolution that cannot, in many cases, be obtained by Lattice Kinetic Monte Carlo methods. Indeed…
A theoretical model to calculate the thermal boundary conductance (Kapitza conductance) or, alternatively, thermal boundary resistance (Kapitza resistance) between a vertically grown mesoscopic nanowire/nanotube and a bulk substrate is presented. The thermal boundary resistance at the interface between the mesoscopic…
Controlled synthesis and organization of nanostructured materials using simple and low-cost methods is important in order to exploit their unique properties for practical applications. We describe the results of a systematic study of the solvothermal soft chemical synthesis of novel nanostructured ZnO architectures. V…
Metalation of N-methyl-1,3-thiazoline-2-thione followed by reaction with elemental S or Se affords a simple and efficient approach to N-methyl-1,3-thiazoline-2-thione-4,5-dithiolate (Me-thiazdt) and the diselenolate (Me-thiazds) analogue. In the presence of metal II centers such as Zn, Ni, and Pd these ligands afford…
The electrode reactions and pathways involved in the electrochemical fabrication of highly ordered ultrathin ZnO nanorod/nanobelt arrays in alkaline solutions of amine−alcohol mixtures are systematically studied and revealed. These include electrochemical surface oxidation of the Zn cathode to Zn(OH) 4 2−, simultaneou…
To clarify the microscopic origin of the temperature-induced three-order-of-magnitude jump in the proton conductivity of CsH(2)PO(4) (superprotonic behavior), we have investigated its crystal structure modifications within the 25-300 degrees C temperature range under both ambient- and high-pressure conditions using sy…
Carbon nanoparticles, like nanocones and nanodiscs, can be obtained by mechanical treatment of carbon nanofilaments. Microstructural studies suggest that in nanocones the conical graphene stacking with progressively increasing apex (cone) angles does not fully agree with current theoretical geometry models, such as a…
Transparent semiconductor CuAlO2 in nanodimension was prepared by mechanical alloying of Cu2O and α-Al2O3 powders in toluene medium. The formation of single phase CuAlO2 with an average crystallite size of 45 nm was confirmed by x-ray diffraction analysis. The nanocrystalline nature of CuAlO2 was confirmed by atomic f…
It is a broad consensus that the first step in the Gilch synthesis of poly( p -phenylene vinylenes) (PPVs) is 1,6-dehydrohalogenation of the 1,4-bis(halomethylene)benzene starting materials. The mechanism of the subsequent chain growth of the resulting α-halo- p -quinodimethane monomers, however, is still a matter of…
Biodegradable and biomimetic SPCL-PLAMA biohybrids were synthesized via ATRP and characterized by FT-IR, (1)H NMR, GPC and DSC. Biohybrids with small PDI were obtained, and the block length of the PLAMA glycopolymer could be varied linearly by the varying the molar ratio of glycomonomer to macroinitiator. The outer PL…
The dianthracene molecule 9-anthracenecarboxylic acid, methylene ester (9AC-ME) was synthesized and used to form molecular crystal nanorods using anodized aluminum oxide templates. A high-temperature solvent annealing process generated a crystal polymorph where neighboring monomers had overlapping anthracene moieties.…
FePt nanoparticles with controlled degree of fluorinated ligands are assembled on surfaces to form higher hierarchical structures by a simple drop casting technique. Place exchange reactions provide tunability of the film morphology and concomitant modulation of the surface from hydrophobic to superhydrophobic (see fi…
Morphology of grain boundaries observed during order−order transition at the perforated layer (PL)/gyroid interface was investigated by electron tomography in a polystyrene- block -polyisoprene (SI)/polystyrene (hS) blend. As a general result, 3D analysis shows the nonrelated orientation of the growing gyroid phase re…
The synthesis of dioxadiazuliporphyrinogen 7 and its oxidized forms: dioxadiazuliporphyrin 8 and dication 8(2+), is reported. These compounds were characterized in solution using UV-vis and 1H and 13C NMR spectroscopic means and in the solid state via single-crystal X-ray diffraction analysis. Dioxadiazuliporphyrin is…
We report on magnetic field and temperature-dependent measurements of the anisotropic magnetoresistance (AMR) in epitaxial La1−xSrxMnO3 (LSMO) thin films. While in 3d ferromagnetic alloys increasing the magnetization, either by reducing the temperature or increasing the magnetic field, increases the AMR, we find that…
A porphycene having four CF3 groups at the beta-pyrrolic positions affords a stable 20pi-conjugated form in the presence of a 2H+-2e- donor due to the high redox potential of the tetrapyrrole ring framework. No visible band in the UV-vis spectrum and the highly ruffled structure determined by X-ray crystallography sup…
Abstract In order to improve the water solubility of nonpolar compounds such as drugs or dyes, new amphiphilic molecules are needed. In this paper we describe a new class of triblock amphiphiles that we have synthesized by a straightforward convergent approach. These amphiphiles each consist of a nonpolar biphenyl cor…
Abstract A room temperature ionic liquid 1‐allyl‐3‐methylimidazolium chloride ([AMIM]Cl) was a promising direct solvent for starch and nonderivitizing solvent for starch‐effective dissolution, in which the ring‐opening graft polymerization (ROGP) of L ‐lactide ( L ‐LA) onto starch chains was carried out homogeneously.…