Materials Literature
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The thermally induced phase transition of the poly(N-isopropylacrylamide) (PNIPAM) brush covalently bound to the surface of the gold nanoparticles was studied using high-sensitivity microcalorimetry. Two types of PNIPAM monolayer protected clusters (MPCs) of gold nanoparticles were employed, denoted as the cumyl- and…
Polynuclear copper(I) complexes with bridging bis(dicyclohexylphosphino)methane (dcpm) and iodide ligands, [Cu(2)(dcpm)(2)(CH(3)CN)(2)](BF(4))(2) (1), [Cu(2)(dcpm)(2)](BF(4))(2) (2), [(CuI)(3)(dcpm)(2)] (3), [(CuI)(4)(dcpm)(2)] (4), and [(CuI)(2)(dcpm)(2)] (5) were prepared and their structures determined by X-ray cry…
Our research in nonlinear optic (NLO) polymer-based electro-optic (EO) modulators has centered on optimizing device performance through the using of polymer cladding layers with higher relative conductivities than the NLO core material. We have demonstrated as much as a 10 times increase in the effective EO coefficien…
We demonstrate the use of a high-resolution solid-state fast (45 kHz) magic angle spinning (MAS) NMR for mapping the oxygen distribution in Hg-based cuprate superconductors. We identify observed three peaks in 199Hg spectrum as belonging to the different chemical environments in the HgO? layer with no oxygen neighbors…
Previous and present "academic" research aiming at atomic scale understanding is mainly concerned with the study of individual molecular processes possibly underlying materials science applications. Appealing properties of an individual process are then frequently discussed in terms of their direct importance for the…
Abstract Summary: Hyperbranched polyesters with controlled molecular weights and properties have been prepared by an A 2 + B 3 approach by reacting glycerol and adipic acid without any solvents in the presence of tin catalysts. The hyperbranched polyesters have been evaluated by size exclusion chromatography (SEC) ana…
It is common to relate the dynamic contact angle $\theta_d$ to the relative speed between the substrate and the contact line; theory suggests $\theta_d^3 \propto U$ . In fact, available physical models show that the dynamic angle involves speed logarithmically and in a model-dependent manner. Experimental data consist…
This review presents the currently used or promising flame retardant systems for the aliphatic polyamides. The largest applications are in electrical parts, with smaller usage in automotive and textiles. A polycyclic chlorohydrocarbon, DECHLORANE PLUS, is employed in low smoke formulations. Decabromodiphenyl ether has…
The localized acid−base properties of different, aluminum oxide thin layer surfaces have been evaluated with X-ray photoelectron spectroscopy (XPS). Five types of oxide layers were studied, which were produced by oxidizing aluminum in a vacuum, with an alkaline and acidic pretreatment, and in boiling water. The photoe…
We report a lithographic process for creating high-resolution (<10 nm) carbon templates on Si(100). A scanning electron microscope, operating under low vacuum (10E-6 mbar), produces a carbon-containing deposit ("contamination resist") on the silicon surface via electron-stimulated dissociation of ambient hydrocarbons,…
We present the electrodynamic response of TiOBr, which undergoes a transition to a spin-singlet ground state for temperatures below T$_{C1}=28$ K. The temperature evolution of the phonon anomalies indicates, like in \cl, an extended fluctuation regime, extending well above T$_{C1}$. At low frequencies, the spectral we…
Soft X-ray Angle-Resolved Photoemission Spectroscopy is applied to study in-plane band dispersions of Nickel as a function of probing depth. Photon energies between 190 and 780 eV were used to effectively probe up to 3-7 layers. The results show layer dependent band dispersion of the Delta_2 minority-spin band which c…
We review key experimental and theoretical results on the Barkhausen effect, focusing on the statistical analysis of the noise. We discuss the experimental methods and the material used and review recent measurements. The picture emerging from the experimental data is that Barkhausen avalanche distributions and power…
When the surfaces of Ag nanowires were coated with thin sheaths of Pd/Ag alloys, they exhibited hydrogen absorption/desorption behaviors and capacities similar to those of pure Pd powders or nanotubes. The stronger mechanical strengths of these cable-like nanostructures also allowed them to undergo more absorption/des…
Abstract The common optimum operating conditions for sonochemical and photocatalytic oxidation coupled with the similarity in the mechanism of destruction leading to a possible synergism and the possible elimination of some of disadvantages observed for individual processing techniques due to the effects of the other…
The discovery of reversible 300 K ferromagnetic ordering in a diluted magnetic semiconductor is reported. Switching of room-temperature ferromagnetism between "on" and "off" states is achieved in Co2+:ZnO by lattice incorporation and removal of the native n-type defect, interstitial Zn. Spectroscopic and magnetic data…
We propose a new generation of materials to maximize reversible H2 storage at room temperature and modest pressures (<20 bars). We test these materials using grand canonical Monte Carlo simulations with a first-principles-derived force field and find that the Li pillared graphene sheet system can take up 6.5 mass% of…
Silver-needle shaped crystals of <TEX>$KLa_2Sb_3S_9$</TEX> from <TEX>$K_2S_x$</TEX> flux and <TEX>$KSm_2Sb_3Se_8$</TEX> from NaCl/KCl flux reactions were obtained and their crystal structures were determined by the single crystal X-ray diffraction method. <TEX>$KLa_2Sb_3S_9$</TEX> crystallizes in the orthorhombic nonc…
The relation between the dielectric constant and the particle polarizability for a polarizable liquid composed of Lennard-Jones particles carrying a saturable induced dipole is studied by computer simulations. It is shown that the widely accepted Clausius–Mossotti relation is only valid for low polarizabilities and fa…
Center for Smart Light-Harvesting Materials and Department of Polymer Science & Engineering,Hannam University, Daejeon 306-791, KoreaReceived December 23, 2003Key Words : Luminescent lanthanide complexes, Energy transfer pathways, Photosensitization, Planarwaveguide amplifiersLuminescent lanthanide complexes have attr…