Materials Literature
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Free base 5,10,15,20-tetrakis(4- n -octylphenyl) porphyrin (H 2 TOPP) belongs to a class of self-organizing porphyrins. Since its LUMO lies above the conduction band of titanium dioxide (TiO 2 ) and its visible light absorption is very strong, sensitization of TiO 2 with H 2 TOPP thin films is possible. After spin-coa…
Triphenyl phosphite was studied by powder X-ray diffractometry, adiabatic calorimetry, and dielectric relaxation measurements. The highly correlated liquid, denoted by L C, phase corresponding with the glacial phase by Cohen et al. was prepared by annealing the ordinary liquid, denoted by L N, at 210 K, and different…
Several mixed cation effects in the electrical conductivity and mechanical loss spectra of mixed alkali and mixed alkali−alkaline earth glasses are identified, and their interrelation is analyzed. Apart from the classical mixed cation effects in the ionic diffusivities, we find characteristic effects in the frequency…
The title compound, K 2 Mn 3 (H 2 O) 6 [Mo(CN) 7 ] 2 ·6H 2 O, has been synthesized by slow diffusion of aqueous solutions saturated in KNO 3 and containing K 4 [Mo(CN) 7 ]·2H 2 O and [Mn(H 2 O) 6 ](NO 3 ) 2, respectively. The compound crystallizes in the monoclinic system, space group C 2. The Mo site is surrounded by…
To improve the understanding of the applicability of CO−FTIR spectroscopy for probing the electronic properties of catalysts, the effect of CO adsorption on the geometry of small metal particles in Pt/LTL and Pt/SiO 2 catalysts with varying support acidities was determined by comparison of X-ray absorption spectra bef…
Atomic force microscopy (AFM) imaging and force−distance curves have been used to investigate, in situ, the nanoscale organization of collagen adsorbed on polymer substrata covering a wide range of surface roughness and surface hydrophobicity: bisphenol A polycarbonate (PC), poly(ethylene terephthalate) (PET), and pol…
We here study magnetic properties of Ni$_{x}$Fe$_{1-x}$ using Augmented space recursion technique coupled with tight-binding linearized muffin tin orbital method. Also the spectral properties of this alloy has been studied here.
We present metal 3s x-ray photoelectron spectra of different transition metal oxides. The values of the 3s exchange splitting for the 3d metal oxides are given as a function of the 3d electron number in the ground state. The spectra were analysed using the simple two-configuration model of the interatomic configuratio…
The surface microstructure of Nd2Fe14B magnets was modified by Fe ion implantation. Their domain structures were studied by magnetic force microscopy. Corrugation and spike pattern domains were found on the (001) plane of unimplanted Nd2Fe14B. After implantation, a domain structure transition from complex maze to stri…
A polarizable ionic interaction model for AlCl3 and FeCl3, constructed from potentials similar to those used for a variety of ionic halides by simply scaling the cation radius, is found to give a semi-quantitative account of the structural and dynamical properties of the liquid and solid phases of AlCl3 and FeCl3. Thi…
By combining positron-annihilation experiments and first-principles calculations, abundant planar ${V}_{6}$ rings are identified in heavily neutron-irradiated graphite. The calculations show that the ${V}_{6}$ ring is particularly stable. Annealing experiments exhibit that the ${V}_{6}$ ring survives up to $1500\ifmmo…
For the nanocomposite magnets (Nd0.9Dy0.1)(Fe0.77Co0.12Nb0.03B0.08)5.5/α-Fe, the best magnetic properties were obtained with the average grain size of α-Fe d=15 nm and with the content of α-Fe cm=45 wt % that is well below the structural percolation threshold of the soft magnetic phase. The measured dependence of the…
We investigate the optical properties of nanoscale InAs quantum dots (QDs) in a Si matrix. At a growth temperature of 400 °C, the deposition of 7 ML InAs leads to the formation of coherent islands with dimensions in the 2–4 nm range. A luminescence band in the 1.3 μm region found exclusively for samples with such InAs…
The Weiss mean-field theory is applied to finite systems with unrestricted sizes, yielding a partition function for supercooled liquids. Finite-size effects broaden the transition and induce a Curie-Weiss--like energy reduction which provides an explanation for the Vogel-Tamman-Fulcher law. Because the energy reductio…
A blue emission powder phosphor Sr2CeO4 for field emission displays was prepared using a chemical coprecipitation technique, which is most suitable for large-scale production. The powders were fired at different temperatures to optimize the properties. Firing the powder at 1200 °C for 2 h gave the highest luminescence…
We report significant intergrain magnetoresistance (IMR) in polycrystalline double perovskites of SrFe1−x(Mo or Re)xO3 at room temperature. Systematics of the temperature dependence of IMR indicates that the observed large room-temperature IMR in SrFe1/2Mo1/2O3 originates from the ferrimagnetic nature of insulating gr…
A mesoscopic model of a diblock copolymer is used to study the stability of a lamellar structure under a uniform shear flow. We first obtain the nonlinear lamellar solutions under both steady and oscillatory shear flows. Regions of existence of these solutions are determined as a function of the parameters of the mode…
Carbon nanotubes prepared by catalytic (CO) disproportionation were studied using TEM, XRD, UPS, XPS, and optical spectroscopies. In comparison with graphite, the carbon nanotubes show greater interplanar distance, smaller work function, steeper Fermi edge, negative core-level shift, and stronger plasma excitation. Th…
Herein we establish a relationship between controlled nanoscale surface interactions and subsequent macromolecular ordering. Striped surfaces of oxide and metal are generated over large areas, where the stripe width is comparable to the size of a polymer molecule. Homopolymers are found to anisotropically dewet such s…
High-energy electron irradiation in ZnO produces shallow donors at about ${E}_{C}\ensuremath{-}30\mathrm{meV}$. Because the production rate is much higher for Zn-face (0001) than O-face $(000\overline{1})$ irradiation, the donor is identified as a Zn-sublattice defect, most likely the interstitial ${\mathrm{Zn}}_{I}$…