Materials Literature
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On the basis of literature ab initio data, we show that diamond nanorods would have a brittle fracture force and a zero strain stiffness that exceeds carbon nanotubes for radii greater than about 1−3 nm, depending on the orientation of the diamond nanorod. The energetic stability of diamond nanorods is predicted by mo…
Functionalized branched polysiloxanes with star-branched, comb-branched and dendritic-branched topologies were synthesized. The branched macromolecules were generated by coupling of reactive blocks using a grafting technique ( ACS Polym. Prepr. 2001, 42, 227; ACS Symp. Ser. 2003, 838, Chapter 2). The living anionic ri…
Abstract Low‐density polyethylene (LDPE) was functionalized by melt radical grafting with glycidyl methacrylate (GMA) and employed for reactive blending with polyamide‐6 (PA6). The effect of the reaction procedure on the grafting degree of LDPE‐ g ‐GMA samples (0.5–12.5 wt.‐% GMA) was analyzed as a function of the con…
A method is developed to take the eddy currents in lamination stacks into account with the finite-element method using the three-dimensional (3-D) magnetic vector potential magnetodynamic formulation. It consists in converting the stacked laminations into continuums with which terms are associated for considering the…
ABSTRACT: The aim of this work is to develop a mathematical model to predict the lysozyme release kinetics from crosslinked polyvinylalcohol (PVOH) into an aqueous solution. The model was developed by taking into account both the diffusion of water molecules into the polymeric film and the counter‐diffusion of the inc…
meso-Arylamino- and alkylamino-substituted porphyrins were efficiently synthesized by reactions of meso-halogenated porphyrins with amines via palladium-catalyzed amination. The combination of palladium acetate and the commercially available phosphine ligand bis(2-diphenylphosphinophenyl) ether (DPEphos) is effective…
Abstract Nisin and/or chitosan were coated, in 3% concentrations, onto paper with a binder medium of vinyl acetate–ethylene co‐polymer to provide antimicrobial activity for use in food packaging. The combined use of nisin and chitosan in the coating was an attempt to give a wide antimicrobial spectrum that could inhib…
We investigated intentionally hydrogenated zinc oxide (ZnO:H) fabricated by combining photoassisted metalorganic chemical vapor deposition and mercury-sensitized hydrogen addition methods. We found that intentionally incorporated hydrogen plays an important role in n-type conduction as a donor, improving free carrier…
A systematic characterization of single-wall carbon nanotube (SWCNT) material after successive purification steps, including reflux treatment with nitric acid, air oxidation, and annealing, has been performed. Inductively coupled plasma–optical emission spectroscopy shows that a considerable reduction of the metal imp…
Fractionated extracts of persimmon (Diospyros kaki) peels were studied for cytotoxic activity, multidrug resistance (MDR) reversal activity, anti-human immunodeficiency virus (HIV) activity and anti-Helicobacter pylori (H. pylori) activity. The potent cytotoxic activity against human oral squamous cell carcinoma cells…
Nanostructured CeO2 films are produced by anodic electrodeposition onto a variety of substrates. The crystal structure and oxidation state of the films are studied by x-ray diffraction (XRD) and x-ray photoelectron spectroscopy (XPS), respectively. Calculations from XRD show that crystallite sizes of the electrodeposi…
The stability of cationic gold clusters doped with one transition metal atom was investigated by a mass spectrometric analysis of fragments resulting from high fluence irradiation of a cluster beam. Strongly enhanced abundances are found for Au 5 X + , X = V, Mn, Cr, Fe, Co, Zn, which implies that these species are fa…
Mullite (Mul) formation after high-T muscovite (Ms) breakdown has been studied in phyllosilicaterich bricks. At T ≥ 900 °C Ms dehydroxylation is followed by partial melting that triggers the nucleation and growth of Mul acicular crystals. An analytical electron microscopy study reveals that the Mul is a 3:2-type with…
OBJECTIVE: Few weight loss supplements are clinically tested for efficacy, yet their proliferation continues. Chitosan-based supplements are sold as fat trappers and fat magnets. They purportedly block fat absorption and cause weight loss without food restriction. We quantified the in vivo effect of a chitosan product…
Shikimate dehydrogenase catalyzes the fourth step of the shikimate pathway, the essential route for the biosynthesis of aromatic compounds in plants and microorganisms. Absent in metazoans, this pathway is an attractive target for nontoxic herbicides and drugs. Escherichia coli expresses two shikimate dehydrogenase pa…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTKinetics of Place-Exchange Reactions of Thiols on Gold NanoparticlesMarco Montalti, Luca Prodi, Nelsi Zaccheroni, Richard Baxter, Gilberto Teobaldi, and Francesco ZerbettoView Author Information Dipartimento di Chimica "G.Ciamician", Università di Bologna, Via Selmi 2, 40126 Bo…
Turbidity measurements performed at 450 nm were used to follow the process of simple coacervation when 1% (w/v) aqueous alkali processed gelatin (type-B) solutions were titrated with methanol, ethanol, propanol, and tert-butyl alcohol at various pHs of the solution ranging from pH = 5 to 8 and ionic strengths varying…
Rietveld refinements using neutron powder diffraction data were used to locate H atom positions and obtain a more precise crystal structure refinement for akaganéite [Fe 3+ 7.6 Ni 2+ 0.4 O 6.35 (OH) 9.65 Cl 1.25 ·nH 2 O]. Difference Fourier maps clearly showed H atoms positions near those O atoms at the midpoints of t…
Cellular material (emulsions, foams) made out of two different phases, one dispersed in another, may coarsen with time through coalescence, which is the rupture of the thin liquid film that separates two adjacent droplets or bubbles. In this Letter, we study destruction through coalescence of a model cellular material…
The synthesis and characterization of a group of new dendrimers-namely, nanoparticle-cored dendrimers (NCDs)-are described. These materials were obtained by the reduction of hydrogen tetrachloroaurate phase-transferred into toluene in the presence of Fréchet-type polyaryl ether dendritic disulfide wedges of generation…