Materials Literature
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Carbon nanotube (CNT) transistors, sensors, and field emitters have recently attracted much attention. However, it is difficult to form ordered submonolayer arrays of these molecular wires because of their high aspect ratio and strong inter-nanotube van der Waals interactions. A tractable procedure for the formation o…
The fluorescence of a triad with TTF and anthracence units can be reversibly modulated by sequential oxidation and reduction. Thus, a new redox fluorescence switch can be established on the basis of this new triad. [structure: see text]
A linear scaling method for calculation of the static {\em ab inito} response within self-consistent field theory is developed and applied to calculation of the static electric polarizability. The method is based on density matrix perturbation theory [Niklasson and Challacombe, cond-mat/0311591], obtaining response fu…
Activated carbon composite prepared from rice husk using phosphoric acid activation has been studied through precarbonization of the precursor followed by chemical activation. This method can produce carbons with micro- and mesoporous structure. The ratio of chemical activating agent to precarbonized carbon was fixed…
A new generation of optically encoded beads has been prepared by using mesoporous polystyrene beads and surfactant-coated semiconductor quantum dots. In comparison with nonporous beads of similar sizes and chemical compositions, the encoded porous beads are approximately 1000 times brighter and 5 times more uniform in…
As the size of material becomes equal to or falls below the nanometer length scale that characterizes the motion of its electrons and thus its properties, the latter become sensitive not only to the size but also to the shape and composition of the particles. In this Account, we describe the changes of some interestin…
Films of BaTiO 3 ranging from 20 nm to 300 nm in thickness were grown with pulsed laser deposition on Nb:SrTiO 3 . The quality of the layers was investigated using atomic force microscopy, X-ray reflectivity and X-ray diffraction. Both the micrographs and the X-ray reflectivity spectra indicate a smooth surface of the…
Abstract Benzoporphyrins, chlorin‐type compounds, are efficient new drugs in photodynamic therapy. In this work, some aspects of the benzoporphyrin‐1,3‐diene dimethyl ester (DiesterB) aggregation were investigated in water–organic solvent mixtures, using visible spectrophotometry. The effects of solvent mixtures, wate…
We have developed a unidirectional composite for improving magnetostrictive properties and mechanical properties of giant magnetostrictive composite. The composite consists of bulk RFe2 dendrites with a preferred orientation of 〈112〉 and an electrically insulated binder between the dendrites, which is analogous to a l…
The structure determination of diclofenac embedded in a diclofenac-containing chitosan matrix using conventional X-ray powder diffraction data is demonstrated. It reveals that sodium diclofenac, the starting material in the preparation of a controlled-release diclofenac-containing chitosan matrix, changes to diclofena…
Efficient use of any diffractometer design requires easy translation between points in reciprocal space and the setting of diffractometer angles. While it is reasonably straightforward to go from angle to reciprocal space, the opposite direction presents more challenges. In this paper, angle calculations are presented…
A high level of hole doping in CuO is realized by Li-substitution and pronounced effect on the structural, transport and magnetic properties of the cupric oxide is reported. The antiferromagnetic transition is reduced from ${T}_{N}=229\mathrm{K}$ in the undoped CuO to ${T}_{N}=91\mathrm{K}$ in ${\mathrm{Cu}}_{0.84}{\m…
A fully automated method for detecting and centring protein crystals for X-ray crystallography is described. It relies on the analysis of rotating crystal trace images. No assumption is made concerning the shape, absolute size, or position of the crystal within its holder. Crystals as small as 15 µm were successfully…
10.1088/0953-8984/16/12/026
A designer Quantitative Structure-Property Relationship, based upon molecular properties calculated using the AM1 semiempirical quantum mechanical method, was developed to predict the glass transition temperature of amine-cured epoxy resins based on the diglycidyl ether of bisphenol A. The QSPR (R2 = 0.9977) was gener…
Two μ-oxo silicon phthalocyanines have been synthesized and subjected to photophysical examination. The results have been compared to the monomeric and dimeric systems published previously. The Q-bands in the ground state absorption spectra undergo a blue shift with respect to the monomer due to an excitonic interacti…
As the closest relatives of embryophytes, the charophycean green algae ( sensu Mattox and Stewart) may reveal the evolutionary history of characters in this lineage. Recent molecular phylogenetic analysis indicates that the little‐known species Entransia fimbriata Hughes is a member of the charophycean order Klebsormi…
The large magnetic entropy change and changes in the magnetic properties of the antiferromagnetic compound LaFe 11.5 Al 1.5 caused by carbonization have been investigated. Both the parent compound LaFe 11.5 Al 1.5 and itscarbides crystallize in the cubic NaZn 13 -type structure. Carbonization brings about an obvious i…
Formation of a rough film of crystalline material on a smooth substrate resulting from kinetic roughening in epitaxy or erosion causes disproportionate changes in reflectivity for s- and p-polarized light. I present a mean-field theory of optical reflectivity difference defined as ${(r}_{p}\ensuremath{-}{r}_{p0}{)/r}_…
Abstract For Abstract see ChemInform Abstract in Full Text.