Materials Literature
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Surface diffusion has an impact on the lateral resolution of nanostructures in bottom-up atom nanofabrication. In this paper we study the effects of the gallium atoms self-assembled on silicon surfaces (100) patterned with trenches at different slopes. These particular substrate morphologies have been made to enable a…
The surface conductivity is measured by a four-probe technique for pentacene and rubrene single-crystals laminated on polarized and nearly unpolarized molecular monolayers with application of perpendicular electric fields. The polarization of the self-assembled monolayers (SAMs) shifts the threshold gate voltage, whil…
Colloidal cobalt-doped TiO2 (anatase) nanocrystals were synthesized and studied by electronic absorption, magnetic circular dichroism, transmission electron microscopy, magnetic susceptibility, cobalt K-shell X-ray absorption spectroscopy, and extended X-ray absorption fine structure measurements. The nanocrystals wer…
As a novel function of ferromagnet (FM)/spacer/FM junctions, we theoretically investigate multiple-valued (or multi-level) cell property, which is in principle realized by sensing conductances of four states recorded with magnetization configurations of two FMs; (up,up), (up,down), (down,up), (down,down). In order to…
We report on the self-organized growth of a regular array of Fe nanoclusters on a nanopatterned magnetite surface. Under oxidizing preparation conditions the (111) surface of magnetite exhibits a regular superstructure with three-fold symmetry and a 42 A periodicity. This superstructure represents an oxygen terminated…
We determine optical absorption cross sections of single-wall carbon nanotubes for visible light copolarized and cross polarized with respect to the nanotube axis. The need for perfectly aligned ensembles in absorbance measurements is eliminated by using Raman scattering to measure the nematic order parameter in magne…
Carboxylate-bearing d-transition metal bipyridyls form ternary complexes with seven-coordinate lanthanide centers. The neodymium,- ytterbium-, and erbium-containing complexes exhibit lanthanide-centered emissions sensitized by the MLCT states of the d-block components.
We demonstrate that the amino acid tyrosine is an excellent reducing agent under alkaline conditions and may be used to reduce Ag+ ions to synthesize stable silver nanoparticles in water. The tyrosine-reduced silver nanoparticles may be separated out as a powder that is readily redispersible in water. The silver ion r…
Pertinent issues of collagen antigenicity and immunogenicity are concisely reviewed as they relate to the design and application of biomedical devices. A brief discussion of the fundamental concepts of collagen immunochemistry is presented, with a subsequent review of documented clinical responses to devices containin…
The charge storage mechanism in MnO 2 electrode, used in aqueous electrolyte, was investigated by cyclic voltammetry and X-ray photoelectron spectroscopy. Thin MnO 2 films deposited on a platinum substrate and thick MnO 2 composite electrodes were used. First, the cyclic voltammetry data established that only a thin l…
The local structure about the Mn site in the half-doped system ${\text{La}}_{1∕2}{\text{Ca}}_{1∕2}{\text{MnO}}_{3}$ was measured in magnetic fields up 10 T to probe the melting of the charge-ordered state. Examination of the Mn-O and Mn-Mn correlations reveals three distinct regions in the structure-field diagram. A b…
Abstract This note deals with the efficient approximation of a non‐linear constitutive relation arising in the study of the three‐dimensional mechanical behaviour of shape memory alloys at constant temperature. In particular, a variable time‐step discretization is investigated. For such an algorithm we prove sharp err…
The dynamic scattering factor S ( Q ,ω) was measured by high-resolution inelastic X-ray scattering using intense X-rays from a third-generation synchrotron radiation facility. The observed spectra demonstrate the existence of longitudinal propagating modes at small Q values, although the collective excitations are hig…
Photoconductivity and various photo-magnetotransport properties have been studied in quantum paraelectric SrTiO 3 crystals. SrTi 16 O 3 shows giant photoconductivity, as reported before. The photodoped carrier in the 16 O system is of electron type and has high mobility beyond 10 4 cm 2 V -1 s -1 at 5 K. Its number ca…
Carbon nanorods were produced with a yield of about 90% by the copyrolysis of C(6)H(6) and C(5)H(6) at 600 degrees C under the cocatalysis of Fe and Mg. Many novel Y-junction carbon nanorods were found in the products. The obtained carbon nanorods have a diameter in the range of 200-350 nm and are several micrometers…
We report the in situ formation of semiconductor and metal nanoparticles (NPs) on colloid particles precoated with weak polyelectrolyte multilayers. Poly(acrylic acid) (PAA)/poly(allylamine hydrochloride) (PAH) multilayers were assembled on the colloid spheres by the layer-by-layer technique and by exploiting copper i…
A biodeterioration study was performed on synthetic polymeric materials including homogenous film made from poly(tetrafluorine ethylene), copolymer film made from tetrafluorine ethylene and perfluoromethyl vinyl ether, vulcanized rubber containing natural caoutchouc, and vulcanized rubber, the main component of which…
Abstract Adsorption of CO and O 2 on Pd particles deposited on a well-ordered Fe 3 O 4 (111) film was studied by temperature programmed desorption. Scanning tunneling microscopy was used to provide structural information. The results show that CO adsorbed on Pd particles reacts with oxygen of the oxide support and for…
The origin of the antiferromagnetic order and puzzling properties of LaTiO_3 as well as the magnetic phase diagram of the perovskite titanates are studied theoretically. We show that in LaTiO_3, the t_{2g} degeneracy is eventually lifted by the La cations in the GdFeO_3-type structure, which generates a crystal field…
Owing to the use of porphyrins in photodynamic therapy for the treatment of malignant tumors, and the preferential interaction of lectins with tumor cells, studies on lectin-porphyrin interaction are of significant interest. In this study, the interaction of several free-base and metalloporphyrins with Momordica chara…