Materials Literature
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Luminescent semiconductor quantum dots (QDs) have great potential for use in biological assays and imaging. These nanocrystals are capped with surface ligands (bifunctional molecules, amphiphilic polymers, phospholipids, etc.) that render them hydrophilic and provide them with functional properties. These coatings alt…
Surface-enhanced Raman (SERS) signatures were measured from single living cells at different times after the uptake of gold nanoparticles. The spectra are indicative of chemical changes in the environment of the nanostructures over time. The increase of the SERS signal strength and parallel TEM studies indicate the fo…
The physical and spatial architectural geometries of electrospun scaffolds are important to their application in tissue engineering strategies. In this work, poly(epsilon-caprolactone) microfiber scaffolds with average fiber diameters ranging from 2 to 10 microm were individually electrospun to determine the parameter…
Abstract We present a computational investigation into the nature of bonds formed by rare earth elements (REE) in materials. This study focuses on the incorporation of neodymium in minerals called apatites, which are derived from fluorapatite: Ca 10 (PO 4 ) 6 F 2 . These minerals, which allow many substitutions on all…
Poly(L‐lactic acid‐co‐glycolic acid) (PLGA) was prepared from hydroxy‐acids with melt polymerization. In this way, the copoly(L‐LA/GA) (PLGA) was synthesized directly using a binary catalyst (tin chloride dihydrate/p‐toluenesulfonic acid). The thermal properties of PLGA were studied by differential scanning calorimetr…
A modified nano‐hydrotalcite was used as inorganic flame‐retardant fillers for poly(ethylene terephthalate) (PET) polymers. A flame‐retardant compound was obtained from layered hydrotalcite (LDH) dispersed in brominated polystyrene (PBS) solution and then solvent evaporation from the dissolved PBS samples. The compoun…
This paper presents a novel differential 0.13/spl mu/m CMOS active inductor circuit, which is employed in the design of an integrated negative refractive index metamaterial phase shifter. The active inductor circuit employs a digital/analog tunable feedback resistance to allow controlling both the inductance and the q…
To reduce the smoke release of poly(vinyl chloride) (PVC) during burning, layered double hydroxides (LDHs) and zinc oxide (ZnO) powders were used to modify the polymer. The results indicated that the addition of LDHs‐ZnO had a significant effect on smoke suppression. The limiting oxygen index (LOI) reached a maximum v…
Abstract Low‐frequency current oscillations (LFCOs) have been observed for the first time in the ferroelectric semiconductor TlGaSe 2 . It is shown that LFCOs can be observed in specially undoped high‐resistivity single crystals and in crystals after annealing for some hours within the incommensurate phase. LFCOs are…
Uniform polyaniline nanofibers were prepared by interfacial polymerization. The nanofibers had a diameter of 80 nm and a length of about 1μm. The effect of centrifugal force on the morphology of the nanofibers is discussed. In situ UV‐Vis spectra indicated that the interfacial polymerization process was similar to the…
Cobalt intercalation into niobium disulfide with layered structure is presented. Powder X-ray diffraction study reveals that single-phase Co x NbS 2 forms in the compositional range of 0.15 ≤ x ≤ 0.55. The hexagonal lattice parameters a and c monotonically increase with cobalt content up to x ∼ 0.5, while a and c are…
Recently, a novel form of nanodiamond exhibiting unusual mechanical properties has been synthesized by high-pressure high-temperature (HPHT) treatment of C60 fullerene, amorphous carbon and diamond powder. In this study, we have characterized the dominant defects in this nanodiamond by a combination of optical absorpt…
Treatment of [Et4N]2[WSe4] with a 1:1 mixture of AgNO3 and PCy3 (Cy = cyclohexyl) in the absence of iodide afforded a linear trinuclear compound [(mu-WSe4)(AgPCy3)2] (1). A similar reaction in the presence of iodide gave rise to the isolation of the cubanelike compound [(mu3-WSe4)Ag3(PCy3)3(mu3-I)] (2). Treatment of […
Abstract Dielectric, ferroelectric and piezoelectric properties of Pb 1− x La x (Zr y Ti 1− y ) 1−( x /4)−(3/4) z Fe z O 3 ceramics for z = 0 to 6 mol% prepared by a mixed oxide method were investigated. Fe substitution in lead lanthanum zirconate titanate (PLZT) compositions resulted in a phase transformation from co…
Imidazolonepropionase (EC 3.5.2.7) catalyzes the third step in the universal histidine degradation pathway, hydrolyzing the carbon-nitrogen bonds in 4-imidazolone-5-propionic acid to yield N-formimino-l-glutamic acid. Here we report the crystal structures of the Bacillus subtilis imidazolonepropionase and its complex…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTPersistence Length of Comblike Polymers Strongly Adsorbed on a Flat SurfaceIgor I. PotemkinView Author Information Physics Department, Moscow State University, Moscow 119992, Russian Federation, and Department of Polymer Science, Un…
We have prepared the first MRI prodrug-procontrast complex by conjugating doxorubicin to a Gd(III) chelate using an acid-labile linker. The relaxometric properties of the adduct and pH activation are reported.
Polystyrene-b-poly(N-isopropylacrylamide) (PS-b-PNIPAM) diblock copolymers either with or without thiol end groups, depending on the relative length of the two blocks, form micelles or vesicles in water. The adsorption of such micelles or vesicles on a gold surface from aqueous solution was investigated in situ at 20…
In the present work, oxidized celluloses were prepared by the 2,2,6,6‐Tetramethyl pipedine‐1‐oxyl radical (TEMPO)‐mediated selective oxidation of the primary alcohol groups at C6 position from natural cellulose pulps treated with NaOH solution. Their adsorption properties for Cu2+ and Cd2+ in aqueous salt solutions we…
Abstract Vanadium‐doped La 3 Ga 5.5 Ta 0.5 O 14 single crystal (0.05 mol% in the melt with respect to Ga) grown by the Czochralski method has been investigated using electron paramagnetic resonance (EPR) and optical absorption measurements. The optical energy gap of pure La 3 Ga 5.5 Ta 0.5 O 14 single crystal is equal…