Materials Literature
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The blocking effect of boundaries in SrTiO 3 bicrystals on the chemical diffusion of oxygen is monitored in situ. The optical technique that is applied allows precise recording of spatial profiles as a function of time. The low symmetrical boundary (near Σ 13) shows a pronounced chemical resistance reflected by a dist…
The crystal structure and magnetoresistance of are investigated. La 1-x Na x MnO 3 crystallizes in a rhombohedrally distorted perovskite structure and exhibits a sharp ferromagnetic transition as well as a negative magnetoresistance at around room temperature. On the basis of alternating-current susceptibility and res…
The YER057c/YIL051c/YjgF protein family is a set of 24 full-length homologs, each approximately 130 residues in length, and each with no known function or relationship to proteins of known structure. To determine the function of this family, the structure of one member--the YjgF protein from Escherichia coli--was solv…
N,O -Bis(trimethylsilyl)-α-amino acids ( N,O -BTMS-AA), mediated by o -phenylene phosphorochloridate (PPC), could oligomerize into polypeptides. The mechanism might go through sequential steps, i.e., the activation of amino acid, the elongation of peptide chain, and the termination of elongation reaction, as can be tr…
TiO2 photocatalysis and ultrasound are emerging technologies for the mineralization of pollutants in water. To further investigate these technologies and to assess whether advantages and synergy can be expected from their differences, phenyltrifluoromethylketone (PTMK) was selected as a test compound for pollutants ge…
A series of thiophene-appended Ru II (bpy) 3 derivatives, Ru(1) 3 , Ru(2) 3 , Ru(3) 3 , Ru(bpy) 2 (1), and Ru(bpy) 2 (2), and their resulting polymers have been synthesized and characterized. The bpy ligands 5,5′-bis(5-(2,2′-bithienyl))-2,2′-bipyridine, 1, 4,4′-bis(5-(2,2′-bithienyl))-2,2′-bipyridine, 2, and 4-(5-(2,2…
The total structure factors of the molten trivalent metal halides MX 3 , where M 3+ denotes La 3+ or Ce 3+ and X - denotes C1 - , Br - or I - , have been measured by using neutron diffraction. Difference function methods were then applied on assuming that the LaX 3 and CeX 3 melts for a given halide ion are isomorphic…
The mechanism of primary nucleation in polymer crystallisation has been investigated experimentally and theoretically. Two types of experiments have been performed on polypropylene, polyethylene, and poly(ethylene terpthalate). Crystallisations with long induction times, studied by small and wide angle X-ray scatterin…
We have studied computationally the adsorption properties of small Ag and Pd clusters deposited on the MgO(001) surface. The calculations were carried out employing a gradient-corrected density functional approach; the oxide surface was represented by model clusters embedded in a large array of point charges. Supporte…
The modeling of liquid spreading and penetration into fibrous materials requires a better understanding of the interactions of thin liquid films and small droplets with single fibers. The wetting properties of fibers may differ significantly from those of plane solid surfaces. Convex surfaces of fibers imply a positiv…
Selective, tailored chelators are of importance in medicine for the treatment of metal intoxication, or to stabilise metal cations in diagnostic radiopharmaceuticals and paramagnetic contrast agents. In this report, the co-ordination chemistry of polyamines, polyalcohols, and polyamino-polyalcohols is examined and som…
The structure of a liquid crystalline (LC) carbosilane dendrimer of the fifth generation bearing 128 terminal cyanobiphenyl mesogenic groups has been studied. This dendrimer was synthesized by a hydrosilylation reaction and then the cyanobiphenyl mesogenic groups were chemically linked to the dendritic matrix via a-OO…
We analyze the origin of medium-range structural order in a simple monatomic liquid simulated by molecular dynamics. Convincing evidence is presented that this structural order, manifested by a prepeak in the structure factor, can be interpreted as chemical ordering in a mixture of atoms and atom-size vacancies. It is…
Activated carbon supports a high power density, but has limited specific capacity. To increase the capacity of activated carbon, ruthenium oxide was loaded into various types of activated carbon by suspending the activated carbon in an aqueous RuCl 3 solution followed by neutralization. Although the Brunauer‐Emmett‐Te…
We report a sharp band observed at 867 ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$ in polarized Raman scattering from the edge plane of highly oriented pyrolytic graphite (HOPG). Polarization measurements indicates that this band is a vibrational mode with ``out-of-plane'' atomic displacement which is absolutely unexpe…
This paper reviews work on the second-order nonlinear optical properties of chiral thin films and surfaces. In particular, we give an overview of the theoretical formalism and experimental procedures that have been used to describe second-harmonic generation from chiral surfaces or thin films. In addition, we discuss…
The simultaneous removal of a surfactant template and attachment of trialkylsilyl groups has been successfully achieved by treating uncalcined MCM-41 with trialkylchlorosilanes, resulting in the synthesis of mesoporous hydrophobic materials of highly uniform pore structure.
Thermoelectric materials are used in a wide variety of applications related to small-scale solid-state refrigeration or power generation. Over the past 30 years, alloys based on the Bi-Te compounds (refrigeration) [(Bi[sub 1[minus]x]Sb[sub x])[sub 2] (Te[sub 1[minus]x]Se[sub x])[sub 3]] and Si[sub 1[minus]x]Ge[sub x]…
From the BCS theory, we derive an equation which accounts for quantum effects of an electron motion along open Fermi surfaces and determines the upper critical field ${H}_{c2}^{\ensuremath{\perp}}(T)$ perpendicular to the chains of a quasi-one-dimensional conductor. This equation demonstrates two unusual phenomena: (1…
A simple and efficient synthesis and characterization of a series of first generation dendrimers based on cyclophosphazene cores and containing up to 16 peripheral chiral ferrocenyl ligands is described.