Materials Literature
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A study aimed at investigating the process of formation of hybrid nanocomposites consisting of a thin polyimide layer containing copper nanoparticles of varying sizes (3−10 nm in diameter) is described. In this system, precursor layers in which copper ions are fully or modestly doped in a chemically modified polyimide…
Proline dehydrogenase (PRODH) catalyzes the first step of proline catabolism, the flavin-dependent oxidation of proline to Delta(1)-pyrroline-5-carboxylate. Here we present a structure-based study of the PRODH active site of the multifunctional Escherichia coli proline utilization A (PutA) protein using X-ray crystall…
A new family of molecule-based magnets of general formula V[TCNQR(2)](2).zCH(2)Cl(2) has been synthesized and characterized (TCNQ = 7,7,8,8-tetracyano-p-quinodimethane; R = H, Br, Me, Et, i-Pr, OMe, OEt, and OPh). In addition, solid solutions of V[TCNQ](x)()[TCNQ(OEt)(2)](2)(-)(x)().zCH(2)Cl(2) composition have been p…
The two flavodoxins (YkuN and YkuP) from Bacillus subtilis have been cloned, overexpressed in Escherichia coli and purified. DNA sequencing, mass spectrometry, and flavin-binding properties showed that both YkuN and YkuP were typical short-chain flavodoxins (158 and 151 amino acids, respectively) and that an error in…
This paper describes the buildup of hydrogen-bonding-directed poly(4-vinylpyridine)/poly(4-vinylphenol) (PVPy/PVPh) multilayer film that was fabricated by layer-by-layer (LbL) assembly of PVPy and PVPh from an ethanol solution. UV-visible spectroscopy and Fourier transform infrared (FT-IR) spectroscopy revealed a unif…
A light-driven process for fabrication of spatially controlled nanoporous polymer films was demonstrated with a new diblock copolymer/small molecule additive system. Poly(α-methylstyrene- b -4-hydroxystyrene) was designed and synthesized with one block functioning as a high-resolution negative-tone photoresist and the…
Cobalt oxide (Co 3 O 4 ) nanotubes were synthesized by calcining cobalt nanowires embedded in an anodic alumina template (AAT) in air. The morphologies and phases of the nanowires/nanotubes were studied by transmission electron microscope (TEM) and x-ray diffraction (XRD) respectively. A hypothesis of the tube formati…
In this study, single-walled carbon nanotube-based sensors are proposed for measuring strain and pressure at the nanoscale. The principle of sensing is based on the resonant frequency shift of a carbon nanotube resonator when it is subjected to a strain resulting from external loading. The carbon nanotube in a bridged…
The effect of synthesis and reaction conditions on the structure and activity of Au clusters supported on nanocrystalline and mesoporous TiO 2 was investigated. X-ray absorption spectroscopy was applied to correlate the particle size and the oxidation state with several parameters, such as pH of the precursor solution…
Nanotechnology is an area receiving increasing attention as progress is made towards tailoring the morphology of polymeric biomaterial for a variety of applications. In the present study an attempt was made to electrospin poly(L-lactide- co -glycolide) biodegradable polymer nanofibres. In this process, polymer fibres…
CdSe and CdSe@CdS semiconductor nanocrystals have been synthesized in aqueous solutions, using sodium citrate as a stabilizer. Although initially these quantum dots display photoluminescence with very low quantum yields, upon prolonged illumination with visible light, enhancements up to 5000% have been measured. This…
To better understand protein/material and cell/material interactions at the submolecular level, well-defined polymer brushes consisting of poly(2-methacryloyloxyethyl phosphorylcholine) (PMPC) on silicon wafers were prepared by atom transfer radical polymerization (ATRP). Silicon wafers were treated with 3-(2-bromoiso…
Four new disubstituted propylenedioxythiophene polymers have been synthesized by Grignard metathesis on the 1−5 g scale. All polymers were found to be soluble in chloroform, methylene chloride, toluene, and tetrahydrofuran and were fully structurally characterized having GPC determined number-average molecular weights…
A strong photoluminescence enhancement effect of illumination on CdTe nanocrystals stabilized by thioglycolic acid (TGA) was observed. Under optimized conditions, the fluorescence quantum yield of CdTe nanocrystals in aqueous solution reached 85% at room temperature. Optical measurements indicated that the photodegrad…
Using high-resolution x-ray scattering in the presence of an applied current, we report evidence for a dynamical decoupling between the two NbSe3 charge-density waves (CDWs), Q1 (T(C1)=145 K) and Q2 (T(C2)=59 K), coexisting below T(C2). Simultaneous and oppositely directed shifts of the relevant CDW superlattice spots…
The magnetocaloric effect and the order of magnetic transition in La(Fe 0.88 Al 0.12 ) 13 C x interstitial compounds have been investigated by means of magnetic measurements and Mössbauer spectroscopy. With increasing carbon content from x = 0.2 to 0.6, the maximum magnetic entropy change decreases from 9.6 to 8.3 J k…
A parallel analysis of the polymorphic behavior and mechanical properties of syndiotactic polypropylene samples with different stereoregularity and crystallized in the helical form and in the trans-planar mesomorphic form, stretched at room temperature and at 4 °C, is reported. Oriented fibers show good elastic proper…
A unique metal-containing liquid crystal consisting of a novel gemini-like metallic macrodiscogen with copper-bis(β-diketonate)-based twin cores has been successfully synthesized. Scanning tunneling microscopy has been used to characterize the ideal square-planar conformation (see Figure). The low ionization potential…
Structural refinement and Raman spectroscopy were used to obtain structural information for Bi 3.25 La 0.75 Ti 3 O 12 , including site preference of La atoms, cation distribution, cation occupancy and lattice parameters. Structural refinement was carried out for three cation disorder models. The best structural refine…
A new method for synthesis of novel hyperbranched poly(ester−amide)s from commercially available AA‘ and CB x type monomers has been developed on the basis of a series of model reactions. The hyperbranched poly(ester−amide)s with multihydroxyl end groups are prepared by thermal polycondensation of carboxyl anhydrides…