Materials Literature
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We analyze a simple model for the copolymerization of two chemically distinct monomers that displays a wide variety of product sequence compositions depending on the rate coefficients for the stepwise addition of each monomer to a growing polymer chain. We show that in certain regions of parameter space the copolymer…
In this work, ab initio density functional calculations were performed to explore the effect of surface lithium vacancies on the initial dehydrogenation kinetics of lithium borohydride. We found that some B−H bonds in neighboring BH 4 -1 complexes around the vacancy became elongated (weakened). The activation barriers…
The objective of the present study is to develop the reaction mechanism and kinetics of photoreduction of NO by CO. For this purpose, the reactions were conducted in the presence of Pd-ion-substituted nano-TiO 2, Ti 1 - x Pd x O 2 - δ, which was synthesized via a solution combustion method. The photocatalytic activity…
Abstract Assembled complexes, Fe(NCX)2(bpp)2 (X = S, Se, BH3; bpp = 1,3-bis(4-pyridyl)propane), have been synthesized. Fe(NCS)2(bpp)2 had a novel 2D interpenetrated structure and showed a temperature-independent HS state, while Fe(NCSe)2(bpp)2 and Fe(NCBH3)2(bpp)2 exhibited a slight decrease in χMT and a complete spin…
We show that the electrical and mechanical properties of the metal electrodes to the side walls of carbon nanotubes or graphene sheets can be dramatically improved through incorporation of (−CON−) and (−COO−) bifunctional molecular anchors. Thus for Pt, the (−CON−) anchor has a contact resistance 60 times lower than t…
The effect of an external salt (AcONa) on the kinetics of adsorption and structure formation inside the adsorption layers (ALs) of chitosan (Ch) and dodecyl chitosan (C12Ch) as well as on the frequency dependence of the complex dilational elasticity modulus of these layers has been studied. The complex dilational elas…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTConductivity Shift of Polyethylenedioxythiophenes in Aqueous Solutions from Side-Chain Charge PerturbationEmril Mohamed Ali, Eric Assen B. Kantchev, Hsiao-hua Yu, and Jackie Y. YingView Author Information Institute of Bioengineering…
The syntheses, structures, and magnetic properties of the complexes [MnIV4MnIII10MnII2O2(OCH3)12(tmp)8(O2CCH3)10].3Et2O (1.3Et2O), [MnIV2MnIII18MnII2O6(OCH3)14(O2CCH3)16(tmp)8(HIm)2].2CH3OH (2.2CH3OH), and [MnIV2MnIII18MnII2O6(OCH3)14(O2CCH3)16(Br-mp)8(HIm)2].2C6H14.5CH3OH (3.2C6H14.5CH3OH) are reported. The unusual w…
We demonstrate the unique ability of catanionic vesicles, formed by mixing single-tailed cationic and anionic surfactants, to capture ionic solutes with remarkable efficiency. In an initial study (Wang, X.; Danoff, E. J.; Sinkov, N. A.; Lee, J.-H.; Raghavan, S. R.; English, D. S. Langmuir 2006, 22, 6461) with vesicles…
Spatially separated ZnO nanopillars were grown on Pt-thin-film-coated Si substrates by electrochemical deposition in Zn(NO 3 ) 2 aqueous solution. The effects of growth parameters, such as Zn(NO 3 ) 2 concentration, cathodic potential, bath temperature, and growth time, were studied with respect to the morphological,…
Here we present a simple but general method for constructing complex binary colloidal crystals with an almost full range of size ratios, which is referred to as "template-assisted electric-field-induced assembly (TAEFIA)". The dependence of the structures of binary colloidal crystals on size ratio (gamma) and volume f…
Ultra-small-angle X-ray scattering was performed on suspensions of anisotropic polystyrene particles of varying degrees of anisotropy. The wave vector dependence of particle form factors is well described by a model developed by Debye for the scattering from fused spheres. As volume fraction is raised, all suspensions…
To understand the spinning process of dragline silk by spiders, the protein conformation before spinning has to be determined. Raman confocal spectromicroscopy has been used to study the conformation of the proteins in situ in the intact abdominal major ampullate gland of Nephila clavipes and Araneus diadematus spider…
Green emission of ZnO microcrystallites has been studied in detail by directly investigating the luminescence from the different crystal surfaces of ZnO microcrystallites by means of room temperature cathodoluminescence (CL). The relative strength of the green emission was found to be strongly dependent on the crystal…
The aquatic colonial stalked diatom, Didymosphenia geminata, has acquired notoriety in recent years because of huge increases in many rivers of temperate regions. However, in some streams in northern England it has probably or, in the case of the R. Coquet (Northumberland), certainly been abundant for many decades. Th…
This paper evaluates the o-hydroxycinnamic platform for designing efficient caging groups with fluorescence reporting upon one- and two-photon excitation. The model cinnamates are easily prepared in one step by coupling commercial or readily available synthons. They exhibit a large one-photon absorption that can be tu…
A series of 2-iminopyrrole ligand precursors with increasing bulkiness [HNC4H3C(R)=N-2,6-R'2C6H3] (R = R' = H, 1a; R = Me, R'= H, 1b; R = H, R' = Me, 1c; R = R' = Me, 1d; R = H, R' = iPr, 1e; R = Me, R' = iPr, 1f) were synthesized and deprotonated with NaH to give the corresponding iminopyrrolyl sodium salts 2a-f. A s…
We present the synthesis, crystal structure, and temperature and field dependence of the magnetic properties of a new molecule-based magnet, [Co(hfac)2].BNO* (1), where hfac = 1,1,1,5,5,5-hexafluoroacetylacetonato and BNO* is the chiral triplet bis(nitroxide), 1,3-bis(N-tert-butyl-N-oxylamino)-5-{1'-methyl-1'-[2' '-(S…
The structure and properties of the possible multiferroic, BiMnO 3, are calculated using the LDA+ U method of density functional theory. The symmetry is found to be centrosymmetric C 2/ c with zero ferroelectric polarization. The stereochemically active Bi lone pairs form local dipole moments which order in an anti-po…
We have designed a type of colloidal particle whose surface characteristics are sensitive to the pH of the aqueous phase in which they are dispersed. Particles of polystyrene latex stabilized by poly(acrylic acid) can act as stabilizers of aqueous foams by adsorbing at the air-water surface. Foams can be prepared and…