Materials Literature
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Abstract Polyurethane/clay nanocomposites have been synthesized using Na + ‐montmorillonite (Na + ‐MMT)/amphiphilic urethane precursor (APU) chains that have hydrophilic polyethylene oxide (PEO) chains and hydrophobic segments at the same molecules. Nanocomposites were synthesized through two different crosslinking po…
We present the results of crystallographic measurements on samples of two latexes: one with a relatively symmetric particle size distribution, and another with a highly skewed pseudobimodal distribution. For the skewed latex, crystallites are clearly visible, but they exhibit only a single Bragg reflection, indicating…
The crystal structure of a hypothetical protein AQ_1354 (gi 2983779) from the hyperthermophilic bacteria Aquifex aeolicus has been determined using X-ray crystallography. As found in many structural genomics studies, this protein is not associated with any known function based on its amino-acid sequence. PSI-BLAST ana…
The pressure behavior of Mn 2+ emission in the 10-, 4.5-, 3.5-, 3-, and 1-nm-sized ZnS:Mn 2+ nanoparticles is investigated. The emission shifts to lower energies with increasing pressure, and the shift rate (the absolute value of the pressure coefficient) is larger in the ZnS:Mn 2+ nanoparticles than in bulk. The pres…
Tetranuclear [Cu(4)mu(2)-dppm)(3)(mu(2)-mu(2)-NS(2))(mu(2)-mu(4)-NS(2))] (1) and pentanuclear [Cu(5)(mu(2)-dppm)(4)(mu(3)-mu-(3)-NS(2))(2)]PF(6) (2.PF(6)) (dppm = bis(diphenylphoshino)methane, NS(2)(2)(-) = 1,8-naphthalenedithiolate) were synthesized from the reactions between NS(2)(2)(-) and [Cu(2)(mu(2)-dppm)(2)(CH(…
The heterogeneous catalytic hydrogenation of polystyrene (PS) dissolved in decahydronaphthalene was studied in a batch reactor using 5% Pd/BaSO 4 as the catalyst. The effects of temperature and H 2 partial pressure were investigated over the ranges from 90 to 180 °C and 1.72 to 6.89 MPa. The PS concentration ranged fr…
Abstract Periodic mesoporous organosilicas have been successfully functionalized with sulfonic acid groups. The resulting materials exhibit much higher catalytic activity than ZSM-5 zeolite and higher catalytic stability than MCM-41 functionalized with the same group.
The overall crystal quality as well as the harvest period of bovine adenosine deaminase containing a zinc ion at the active centre has been compared in three different environments: crystallization as a control, crystallization with agarose gel and crystallization in a high magnetic field. In crystallization with agar…
We propose here a new model for gold nanoparticles, which are thought to be solubilized by either a Au(I)−citrate or Au(I)−sulfide layer. In the case of pure Au(0) particles, stabilization of the colloidal solutions occurs by inverse micelles or by tight adsorption of solvent covers, in particular acetone. The main ev…
The [Ru(CN)(6)](3-) ion is synthesized in aqueous solution and isolated as [Ph(4)As](3)[Ru(CN)(6)].2H(2)O (1). Compound 1 crystallizes as orange needles in the monoclinic space group P2(1)/n with cell parameters a = 11.346(2) A, b = 23.107(5) A, c = 25.015(5) A, beta = 99.55(3) degrees, V = 6467.1(22) A(3), Z = 4. The…
Recently, the observation of a new monoclinic phase in the PbZr 1− x Ti x O 3 (PZT) system in the vicinity of the morphotropic phase boundary was reported. Investigations of this new phase were reported using different techniques such as high-resolution synchrotron x-ray powder diffraction and Raman spectroscopy. In t…
To describe accurately the electronic structures of carbon nanotubes, a semi-empirical tight-binding approach is presented in which the main intrinsic curvatures have been fully taken into account. The calculated electronic structures and band gaps are consistent with experimental measurements. Studies of the relative…
Experimental evidence including infrared spectra for the formation of the dinitrosyl metalloporphyrin complexes M(P)(NO)(2) (M = Ru or Fe, P = tetraphenylporphyrin (TPP), octaethylporphyrin (OEP), or tetra-m-tolylporphryin (TmTP)) is described. Although observation of a single NO stretching band in the IR spectrum of…
F marks the spot: We report a new technique for selectively labeling Trp side chains in proteins with 19F by using 3β-indoleacrilic acid as an inhibitor of tryptophan biosynthesis. Our method finds useful application in the study of protein–protein or protein–ligand interactions (see figure) by means of 19F NMR spectr…
Abstract ZnO/MgO, ZnO/CaO, and ZnO/CaO/MgO can form solid solutions. The solid solution for we as flame retardant (SSFR) was obtained by annealing at 1023 K for 4.5 h in a muffle furnace. Flexible poly (vinyl chloride) (PVC) filled with SSFR and Sb 2 O 3 was investigated by differential thermal analysis thermogravimet…
Monodisperse cross-linked composite PMMA latex particles have been developed. The chemical cross-linking of the PMMA facilitates the preparation of particles consisting of a fluorescent core and a large nonfluorescent shell. These core−shell spheres can be dispersed in a density and refractive index matching mixture.…
Layer-by-layer multilayer films of poly(styrenesulfonate) (PSS) and 4th generation poly(amidoamine) dendrimer (4G PAMAM) assembled on particle supports were modified by a stepwise process involving (i) cross-linking of free amino groups of PSS/4G PAMAM multilayers using a bifunctional cross-linking agent, gluteraldehy…
An iterative process for improving the completeness and quality of atomic models automatically built at moderate resolution (up to about 2.8 A) is described. The process consists of cycles of model building interspersed with cycles of refinement and combining phase information from the model with experimental phase in…
We present the crystallization kinetics for two polydisperse hard-sphere particle stocks with differing particle size distributions. One of the latexes had a relatively symmetrical distribution, the other had a more polydisperse distribution, which was highly skewed to smaller sizes. The emerging Bragg reflections fro…
The Raman scattering on acoustical phonons from ${\mathrm{CdS}}_{x}{\mathrm{Se}}_{1\ensuremath{-}x}$ quantum dots in a glass matrix were investigated for in- and off-resonance conditions. By a comparison with a model calculation, the off-resonance scattering showed that the homogeneous broadening mainly contributes to…