Materials Literature
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A novel class of electrocatalyst for oxygen reduction reaction (ORR) in polymer electrolyte membrane fuel cell (PEMFC) was prepared by electrochemically dealloying Pt25Cu75 precursor alloys in a membrane electrode assembly (MEA) cathode. The precursor was prepared by a novel liquid impregnation-freeze drying route. Th…
We report on a novel strategy to modify surface electrocatalytic reactivity of Pt bimetallic nanoparticles for the oxygen reduction reaction (ORR). We voltammetrically dealloy Cu rich Pt-Cu precursor until we obtain a Cu free catalyst surface. This dealloyed Pt surface exhibited up to fivefold improved ORR activities…
Camptothecin (CPT) is an alkaloid that displays considerable antitumour activity, but clinical use has been limited by its poor water solubility and the instability of the lactone moiety (active form) in physiological media. We have therefore formulated the drug into nanocarrier systems in an attempt to improve its th…
Pressure-induced phase transitions in the nanocrystals of ReO 3 with an average diameter of ∼12 nm have been investigated in detail by using synchrotron x-ray diffraction and the results compared with the literature data of bulk samples of ReO 3 . The study shows that the ambient-pressure cubic I phase (space group )…
Abstract We investigate the effect of irradiation by Ar + and N + ions on the properties of thin transparent networks of single‐wall carbon nanotubes (SWNTs). The irradiation produces a small reduction in the infra‐red transmittance of the networks at a wavelength of 2000 nm that correlates with the much larger reduct…
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A carbocyclic analogue of the beta-lactam antibiotic isopenicillin N (IPN) has been synthesised and cocrystallised with isopenicillin N synthase (IPNS), the central enzyme in the biosynthesis of penicillin antibiotics. The crystal structure of the IPNS-cyclobutanone complex reveals an active site environment similar t…
The development of in-plane orbital ordering with oxygen deficiency is investigated in epitaxially strained thin films of La 0.7 Sr 0.3 MnO 3- δ grown under in-plane tensile strain on SrTiO 3 substrates. The orbital character of 3 d states is directly probed by linear dichroism in X-ray absorption spectroscopy at the…
We discuss the results of our experiments on tunnel devices based on (Ga,Mn)As structures. Those include p + -(Ga, Mn)As/n + -GaAs Esaki diodes and laterally defined narrow nanoconstrictions in (Ga,Mn)As epilayers. We found in those structures strong anisotropic magnetoresistance behaviour with features that could be…
Abstract The effect of the KH‐550 type silane coupling agent on the properties of polypropylene (PP)/brucite (BC) composite was studied. X‐ray diffraction, scanning electron microscope, and polarization optical microscope indicated that morphology structure of PP changed with the addition of KH‐550, which activated th…
We report the synthesis and structural characterization of two dumbbell-shaped dendrimers incorporating 9-phenylcarbazole units as dendrons, as well as their thermal, morphological, photophysical, and electrochemical properties.
By a novel controlled combustion synthesis method, a large number of nanostructured ZnO whiskers with different morphologies, such as tetra-needles, long-leg tetra-needles and multi-needles, are prepared without any additive in open air at high temperature. The morphologies and crystalline structures of the as-prepare…
We report a thorough characterization of the glassy dynamics of benzophenone by broadband dielectric spectroscopy. We detect a well-pronounced beta relaxation peak developing into an excess wing with increasing temperature. A previous analysis of results from Optical-Kerr-effect measurements of this material within th…
Small angle neutron scattering was performed on disordered mixtures of nonadsorbing homopolymer (A) chains and diblock (A-B) copolymer micelles in an A selective solvent. Increasing the molecular weight or concentration of A led to an increase in the aggregation number, and a decrease in the effective hard-sphere diam…
Fluorescent proteins from the green fluorescent protein (GFP) family interact strongly with CdSe/ZnS quantum dots. Photoluminescence of GFP5 is suppressed by red-emitting CdSe/ZnS quantum dots with high efficiency in a pH-dependent manner. The elevated degree of quenching, around 90%, makes it difficult to analyze the…
Selective lateral etching of the SiGe layer for various Si/SiGe/Si systems was studied. We showed the different etching rates for SiGe layers with the same thickness and Ge concentration, but with different structures of the Si/SiGe/Si stacked layer. We described a mechanism that could explain the experimental results…
This paper describes the AnnoCryst system-a tool that was designed to enable authenticated collaborators to share online discussions about 3D crystallographic structures through the asynchronous attachment, storage, and retrieval of annotations. Annotations are personal comments, interpretations, questions, assessment…
Fluorochrome marking of the gastropod Concholepas concholepas has shown that the prismatic units of the shell are built by superimposition of isochronic growth layers of about 2 mum. Fluorescent growth marks make it possible to establish the high periodicity of the cyclic biomineralization process at a standard growth…
Various alkalis, judiciously selected on the basis of their base dissociation constant (K b), were used for degumming of ramie fiber. They were graded according to their performance with respect to the removal of individual components of the gummy material. The fiber properties were analyzed in terms of residual gum c…
A new method utilizing image capture and processing was developed for the analysis of blood plasma coagulation at surfaces. The coagulation was detected in a cuvette by time-lapse image capture of light scattering from the developing fibrin network. By image processing and computer analysis of the captured image data,…