Materials Literature
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In this work we address experimentally a number of unresolved issues related to microwave induced resistance oscillations (MIRO) and the zero-resistance states observed recently on very high-mobility 2D electron gases in GaAs/AlGaAs heterostructures. In particular, we examine electrodynamic effects via reflection/abso…
The Watts-Strogatz algorithm transferring a regular lattice to the small world network is modified by introducing preferential rewiring constrained by connectivity demand. The probability to link to/ unlink form a node is dependent on a vertex degree and adjusted by some threshold. For each threshold value there exist…
A comparative study of the crystalline and molecular structures of trifluoroacetate trihydrates of Tb(III) prepared from Tb(OH)_3 and Tb_2(CO_3)_3 by reaction with trifluoroacetic acid is made. Elemental analysis of the two reaction products in indicated them to be compounds of the same C_6H_6F_9O_9Tb. According to th…
The purification of protein complexes can be accomplished by different types of affinity chromatography. In a typical immunoaffinity experiment, protein complexes are captured from a cell lysate by an immobilized antibody that recognizes an epitope on one of the known components of the complex. After extensive washing…
Various amino acids were intercalated into Mg−Al layered double hydroxides (LDHs) as interlayer anions. The goal of this approach was to create an interlayer environment that was attractive to formamide, because of hydrogen bonding, so that penetration of formamide would lead to delamination. Some of the amino acid in…
The preparation of a new family of mixed transition metal/lanthanide clusters is reported. The reaction of [Mn3O(O2CPh)6(py)2(H2O)] with Ln(NO3)3 (Ln = Nd, Gd, Dy, Ho, and Eu) in a 1:2 molar ratio in MeOH/MeCN (1:20 v/v) leads to dark crystals in 55-60% isolated yield of complexes all containing the [Mn11Ln4]45+ core.…
The optical properties of a high quality bulk $\mathrm{ZnO}$, thermally post treated in a forming gas environment are investigated by temperature dependent continuous wave and time-resolved photoluminescence (PL) measurements. Several bound and free exciton transitions along with their first excited states have been o…
We report the synthesis and characterization of highly luminescent colloidal nanocrystals consisting of CdSe cores protected with double inorganic shells (core−shell−shell nanocrystals). The outer ZnS shell provides efficient confinement of electron and hole wave functions inside the nanocrystal as well as high photoc…
A novel europium coordination complex [Eu(AMBA)3(H2O)2·H2O]2 has been obtained from ethanol solution and characterized structurally by X-ray diffraction (AMBAH=3-amino-4-methylbenzoic acid). The results reveal that it forms a dimeric molecular structure through bridging oxygen atoms of carboxylate groups. The title co…
The first successful multi-wavelength anomalous diffraction (MAD) experiments using ultra-high-energy X-rays (∼35 keV) were performed for iodine and xenon derivatives of hen egg-white lysozyme crystals. The beamline BL41XU of SPring-8 enabled the collection of high-quality MAD data, which led to the calculation of ano…
In two previous papers [Gilmore, Barr & Paisley (2004). J. Appl. Cryst. 37 , 231–242; Barr, Dong & Gilmore (2004). J. Appl. Cryst. 37 , 243–252], it was demonstrated how to generate a correlation matrix by comparing full powder diffraction patterns, and then partition the diffractograms into groups using multi…
Abstract We present a detailed study of the electric mechanism of a thin poly( o ‐methoxyaniline) (POMA) field‐effect transistor. The device was prepared using Al‐Si/SiO 2 /(interdigitated gold lines array)/POMA structure as the gate electrode, insulating layer, source‐drain electrodes, and active layer, respectively.…
A destructive interference observed in high-resolution surface X-ray reflectivity data for diverse systems has been used as a `fingerprint' for determining the terminating plane of layered crystals. It is shown that this phenomenon is ( a ) general to layered crystal structures, ( b ) directly sensitive to the crystal…
The reactions of the low-temperature polymorph of copper(I) cyanide (LT-CuCN) with concentrated aqueous alkali-metal halide solutions have been investigated. At room temperature, KX (X = Br and I) and CsX (X = Cl, Br, and I) produce the addition products K[Cu(2)(CN)(2)Br].H(2)O (I), K(3)[Cu(6)(CN)(6)I(3)].2H(2)O (II),…
Treatment of titanyl sulfate in about 60 mM sulfuric acid with NaL(OEt) (L(OEt) (-)=[(eta(5)-C(5)H(5))Co{P(O)(OEt)(2)}(3)](-)) afforded the mu-sulfato complex [(L(OEt)Ti)(2)(mu-O)(2)(mu-SO(4))] (2). In more concentrated sulfuric acid (>1 M), the same reaction yielded the di-mu-sulfato complex [(L(OEt)Ti)(2)(mu-O)(mu-S…
Novel biodegradable polyester block copolymers have been synthesized by using well-defined poly(3-hydroxyoctanoate) (PHO) oligomers having a hydroxyl end group and an ester end group with M(n) values of 800, 2,500, 5,300, 8,000, or 20,000 as an elastomeric soft segment and poly(epsilon-caprolactone) as a more crystall…
The feasibility of measuring the coherent x-ray scatter form factors of amorphous materials using powder diffractometers has been assessed. A five-step procedure was developed: (i) Low-angle background, consisting of a portion of the incident x-ray beam that passes directly to the detector, is measured using a special…
We have obtained the magnetic field $(H)$ versus temperature $(T)$ magnetic phase diagram for the triangular lattice antiferromagnet $\mathrm{Cu}{\mathrm{Fe}}_{0.98}{\mathrm{Al}}_{0.02}{\mathrm{O}}_{2}$ using neutron diffraction, magnetization and specific heat measurements on single-crystal samples. On the substituti…
Plasma treatment of polymer surfaces is used to control the generation of topological surface structures: stripes, starlike morphologies, and pinnacles in the range from 100 nm up to several micrometers. These protrusions arise when the plasma-treated polymer surface is exposed to an organic solvent (liquid or vapor p…
Fluorescence studies of poly(2-methoxy-5-(4-(phenylazo)phenyl-4‘-(1,10-dioxydecyl))-1,4-phenylenevinylene) (MPA-10-PPV), a PPV derivative with alkyl-tethered azobenzene side chains that was first synthesized by Yoshino and co-workers, are presented. The emission intensity of MPA-10-PPV in dilute solution is partially…