Materials Literature
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A procedure for Rietveld quantitative amorphous content analysis (RQACA) is outlined, in which the effects of systematic errors in the powder patterns are studied. The method derives the amorphous content from the small overestimation of an internal crystalline standard in a Rietveld refinement of an appropriate mixtu…
The 3ω method has been proven to be very useful for determining the thermal conductivity of thin films and their substrates. Several simplifications are often used in determining the thermal conductivity of the films based on the experimentally measured 3ω signal. These simplifications, however, have limited range of…
Detailed guidelines for controlling magnetic states in ZnO-based diluted magnetic semiconductors are given based on ab initio electronic structure calculations within the local spin density approximation using the Korringa-Kohn-Rostoker method. Effects of disorder were taken into account by the coherent potential appr…
The key factors determining the performance of supercapacitorshave been studied using single-walled carbon nanotube (CNT) electrodes. Heat treatment at high temperatures is found to increase the capacitance and reduce the CNT electrode resistance. A very efficient energy storage device was obtained with a CNT-Ni foam…
Global indicators of the quality of diffraction data are presented and discussed, and are evaluated in terms of their performance with respect to various tasks. Based on the results obtained, it is suggested that some of the conventional indicators still in use in the crystallographic community should be abandoned, su…
Total scattering, an increasingly important crystallographic research area, is defined theoretically in terms of correlation functions. Different researchers use different definitions for these functions, frequently leading to confusion in the literature. Here, a consistent set of equations for total-scattering correl…
The goal of the "Opportunities for Catalysis Research in Carbon Management" workshop was to review within the context of greenhouse gas/carbon issues the current state of knowledge, barriers to further scientific and technological progress, and basic scientific research needs in the areas of H2 generation and utilizat…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTNoncovalent Sidewall Functionalization of Single-Walled Carbon Nanotubes for Protein ImmobilizationRobert J. ChenRobert J. ChenDepartment of Chemistry, Stanford University Stanford, California 94305 More by Robert J. Chen, Yuegang ZhangYuegang ZhangDepartment of Chemis…
The synthesis of new metallophthalocyanine-oligonucleotide conjugates is reported. These conjugates can cause sequence-specific photosensitized or catalytic oxidation of DNA by molecular oxygen.
In this article the relation between the morphology and macroscopic mechanical properties, i.e., stiffness and strength, of blends of polypropylene (PP) and polystyrene (PS) within the framework of micromechanics of composite materials was studied. Test results on tensile properties of immiscible PP/PS blends showed t…
High strain rate mechanical testing on fully hardened AISI D2 tool steel (at 62 HRc) was performed utilizing the Compressive Split Hopkinson Bar technique (CSHB) incorporating a punching shear strain state. The high strain rate conditions were comparable to those encountered in machining processes, with shear strain r…
[Rh 6 (CO) 16 ] was prepared on the surface of TiO 2 (calcined at 200 or 400 °C) by deposition from n -hexane solution and by a surface-mediated synthesis from TiO 2 -supported [Rh(CO) 2 (acac)] in the presence of CO at 1 atm and 100 °C. The cluster preparation and subsequent decarbonylation by treatment in He or H 2…
Direct precipitation of metal oxides from high boiling point organic solvents presents an alternative to wholly aqueous hydrothermal material synthesis routes. In the current study, reaction conditions to control particle size and shape of α-alumina, precipitated from 1,4-butanediol solutions are described. Synthesis…
We consider the Cahn-Hilliard equation-a fourth-order, nonlinear parabolic diffusion equation describing phase separation of a binary alloy which is quenched below a critical temperature. The occurrence of two phases is due to a nonconvex double well free energy. The evolution initially leads to a very fine microstruc…
The photophysical properties and the excitation energy transfer (EET) process of a series of first generation dendrimers having a rigid tetrahedral core and different numbers of peryleneimide chromophores at the rim were investigated by steady-state and time-resolved fluorescence spectroscopy in toluene. It was shown…
The reaction of methanol with a preoxidized Cu(100) surface in the temperature range of 90−200 K has been studied with reflection−absorption infrared spectroscopy (RAIRS). Methanol is found to form methoxy (CH 3 O) at or below 90 K. The OH stretch vibration at 3550 cm -1 of a surface hydroxyl group (OH(ad)) appears as…
Methods for measuring the viscosity coefficients of the best known type of anisotropic fluid, nematic liquid crystals (NLCs), are reviewed. The hydrodynamic Leslie – Ericksen – Parodi theory is described in brief, which predicts five independent viscosity coefficients for a NLC. The feature that distinguishes NLCs fro…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTOxidation of TTF Derivatives Using (Diacetoxyiodo)benzene: a General Chemical Route toward Cation Radicals, Dications, and Nonstoichiometric SaltsMichel Giffard, Gilles Mabon, Emmanuel Leclair, Nicolas Mercier, Magali Allain, Alain Gorgues, Philippe Molinié, Ojars Neil…
Mixtures of polyols (glycerol, propylene glycol, glucose) and water were emulsified in oil (isopropyl myristate (IPM), medium chain triglycerides (MCT), long chain triglycerides (LCT), and d-limonene) under elevated pressures and homogenization, in the presence of polyglycerol polyricinoleate (PGPR), glycerol monoolea…
Model platinum catalysts have been designed to study the platinum−solvent interface in situ using attenuated total reflection (ATR) infrared spectroscopy. Pt and Pt/Al 2 O 3 thin films were evaporated on a Ge internal reflection element (IRE) and characterized by XRD, XPS, AFM, STM, and IR spectroscopy. Changes within…