Materials Literature
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Abstract A reaction of copper acetate with a phosphate salt of pentadentate ligand yielded octadecanuclear complex, [Cu18(Hbeamp)6(PO4)8]·C3H7OH·24H2O (H3beamp = 2,6-bis[N-(2-hydroxyethyl)aminomethyl]-4-methylphenol), in which Cu(II) ions were bridged by alkoxo, phenoxo, and phosphate groups. Magnetic susceptibility m…
This paper describes the relatively simple modification of a light microscope to operate with ultraviolet-based optics. Using a 280 nm UV illumination source, protein microcrystals are readily visualized in gels made from hydrated bilayers of phospholipids. Non-colored proteins stand out as clearly as colored proteins…
This paper reports an improved headspace gas chromatography (HS-GC) technique for the determination of carboxyl group content in wood fibers. The method is based on phase reaction conversion HS-GC technique developed previously [Chai et al., Ind. Eng. Chem. Res. 2003, 42, 5440−5444], but with major modifications in re…
Microstructure characterization and phase transformation kinetics of a high-energy ball-milled and post-annealed stoichiometric (1:1 mol%) m -ZrO 2 and amorphous ( a -) SiO 2 powder mixture have been investigated by Rietveld analysis of X-ray powder diffraction data. The experimental results reveal that the ball-milli…
Abstract A one-pot method characterized by thermolysis of a novel kind of single-source precursor was proposed to generate size-tunable monodisperse Ag2S(r) semiconductor nanoparticles in large scale.
A low-resolution ab initio shape determination was performed from small-angle neutron and X-ray scattering (SANS and SAXS) curves from solutions of polycarbosilane dendrimers with the three-functional and the four-functional branching centre of the fourth, fifth, sixth, seventh and eighth generations. In all cases, an…
We propose core-shell InP-CdS and InP-ZnTe nanorods as photoelectrodes in the efficient photoelectrochemical hydrogen production. On the basis of our systematic study using strain-dependent k.p theory, we find that in these heterostructures both energies and wave function distributions of electrons and holes can be fa…
Superlong single crystal tellurium nanoribbons with a width of 200-300 nm and length up to several hundred micrometers have been synthesized in tetraethylene pentamine aqueous solution at 80 degrees C. The stability of as prepared tellurium nanoribbons in solvents such as pure ethanol and deionized water has been stud…
The pyridine-containing copolymers {[NP(O 2 C 12 H 8 )] X [NP(OC 5 H 4 N) 2 ] 1 - X } n, with X = 0.7 ( 3a ) and X = 0.8 ( 3b ), and their respective organometallic derivatives of approximate formula {[NP(O 2 C 12 H 8 )] X [NP(OC 5 H 4 N·MLn) 2 ] 1 - X } n with MLn = CpFe(dppe), CpRu(PPh 2 ) 2, (n 5 -CH 3 C 5 H 4 )Mn(…
Proteins provide versatile mediators for assembling nanoparticles into organized composites. Here, we demonstrate that a single protein spacer (lysozyme) can be used to direct the self-assembly of gold mixed monolayer protected clusters into controlled ensembles with varied functional response. This efficient self-ass…
Variable-temperature high-resolution capillary-mode powder X-ray diffraction is used to assess changes in unit-cell dimensions as a function of temperature over the range 188–328 K. No evidence was found for any polymorphic transformations over this temperature range and thermal expansion coefficients for urea were fo…
Biointerfaces that limit nonspecific adhesion of serum proteins have been developed by relying solely on cross-linked hydrogels. In addition to being characterized for adhesion of serum proteins, immunoassay sensitivity was also investigated through a sandwich assay for rhIL-1ra. Among the compositions developed, the…
Abstract Gel fibers of 2-oxochromen-6-yl 4-(S)-(2,6-dimethylheptyloxy) and 4-(S)-(3,7-dimethyloctyloxy)benzoates in cyclohexane were observed to grow along the surface of wall in a fine capillary. The structure of the oriented fibers was characterized by SEM and X-ray diffraction measurements, and the fiber structure…
The refinement of the crystal structure of synthetic syngenite K2Ca(SO4) · H2O has been carried out through the Rietveld method on X-ray powder diffraction data. Space group is P21/m, a = 9.7710(2) Å, b = 7.1449(2) Å, c = 6.2469(1) Å, β = 103.992(2)°. Conventional agreement indices are Rp = 5.26%, wRp = 7.02%, RF =…
Abstract Subnanometer-sized gold clusters protected by thiolated β-cyclodextrin (HS-β-CD) were successfully isolated using polyacrylamide gel electrophoresis. Thermogravimetric measurements reveal that two β-CD ligands are bound to the Au clusters. One-dimensional assemblies of the β-CD-modified gold clusters are form…
Ultrasound was used in the presence of hydrogen peroxide as the oxidant to synthesize benzaldehyde from benzyl alcohol. A commercially available homogeneous catalyst (heteropolyacid) and a phase-transfer catalyst (PTC) were used for the reaction. The effects of various parameters, such as solvent, amount of PTC, bulk…
A tetranuclear gadolinium(III) complex, [Gd4(H2O)8], of DO3A appended onto the pentaerythrityl framework was synthesized to improve the water proton relaxivity for MRI application. The longitudinal relaxivity of [Gd4(H2O)8] is 28.13 mM-1 s-1 (24 MHz, 35+/-0.1 degrees C, pH 5.6) which is 5.86 times higher than that of…
Vanadium oxide foams have been prepared by mixing V 2 O 5 with hydrogen peroxide and a solution of 1-hexadecylamine. The resulting yellow foams (YF) have been characterized by different methods including X-ray diffraction, thermal analyses, scanning and transmission electron microscopy, infrared spectroscopy, electron…
Doubly bridged dicobalt complexes with bidentate diamine ligands were synthesized and characterized by X-ray diffraction studies. Reversible formation and decomposition of the doubly bridged structure utilizing the redox couple between Co(II) and Co(III) were investigated by cyclic voltammetry and UV-vis.
A new similarity index for automated comparison of powder diagrams is proposed. In contrast to traditionally used similarity indices, the proposed method is valid in cases of large deviations in the cell constants. The refinement according to this index closes the gap between crystal structure prediction and automated…