Materials Literature
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Static and time-resolved photoluminescence (PL) along with transient absorption (TA) measurements have been used to elucidate the relaxation and recombination dynamics of single excitons and multiexcitons in CdSe nanorods with organic ligands and CdSe/CdS core/shell nanorods. The core/shell particles are synthesized f…
A high-throughput method for measuring the Seebeck coefficient, S, and the electrical conductivity, σ, of lithographically patterned nanowire arrays is described. Our method involves the microfabrication of two heaters and two Ag/Ni thermocouples, literally on top of an array of polycrystalline PbTe nanowires synthesi…
This study presents a special, economically valuable, unprecedented eco-friendly green process for the synthesis of silver nanoparticles. The silver nanoparticles were obtained from a waste material with oil palm biosolid extract as the reducing agent. The use of the oil palm biosolid extract for the nanoparticle synt…
A sequential self-repetitive reaction (SSRR) based on carbodiimide (CDI) chemistry was utilized for preparing a high-yield wholly aromatic polyimide. The polyimide was synthesized with 4,4′-methylene-diphenylisocyanate (MDI) and a di(acid-ester) compound which was derived from the ring-opening reaction of 3,3′,4,4′-ox…
Sodium metaborate (NaBO 2 ) is the hydrolysate of sodium borohydride (NaBH 4 ) for hydrogen production. Trimethyl borate (B(OCH 3 ) 3 ), the major reactant for producing sodium borohydride via the Brown−Schlesinger process, is successfully regenerated from sodium metaborate (NaBO 2 ) via a sequential process including…
Abstract By kinetically controlling a biomimetic reduction in a quasi‐biological system (an aqueous solution containing electrolyte, peptide, and coenzyme), water‐soluble, glutathione‐capped Au clusters with a mean diameter of 1.3 nm are successfully synthesized via a new route. Opportunities that facilitate the contr…
The effects of complexation--by bidentate nitrogen-containing ligands such as pyrazine and 4,4'-bipyridine commonly used for porphyrin self-assembly--on the photophysics of the model metalloporphyrin, ZnTPP, are reported. Ligation to form the 5-coordinate species introduces an intramolecular charge transfer (ITC) stat…
It is confirmed that a layer of vacuum-evaporated carbon on the surface of a preoriented ultrathin polymer film can lead to an oriented recrystallization of the polymer film. This has been attributed to a strong fixing effect of vacuum-evaporated carbon layer on the film surface of the polymer. To study the origin of…
The dry sliding wear of a medium carbon steel with different microstructures was measured under the normal load range of 50–150 N at 400°C by a pin-on-disc high-temperature wear setup. The wear behavior and wear mechanism were systematically studied; in particular, the characteristics of extrusive wear and the transit…
Abstract Antifungal activities of chitosans (CTS) with different molecular weights ( M w ) and different concentrations against Fulvia fulva (cooke) ciffrri ( F. fulva ) causing leaf mold in tomato plants were studied in vitro and in vivo ; the action mode and its inhibition at different stages during the life cycle o…
OBJECTIVE: The development of biological valve prostheses with lifetime native-like performance and optimal host engraftment is an ultimate goal of heart valve tissue engineering. We describe a new concept for autologous graft coating based on a CD133(+)-stem-cells-plus-fibrin (SC+F) complex processed from bone marrow…
Abstract Two series of new organosoluble polyamides with methyl‐substituted triphenylamine (MeTPA) units showing anodically electrochromic characteristic were prepared from the phosphorylation polyamidation reaction of two diamine monomers, 4,4′‐diamino‐2″,4″,6″‐trimethyltriphenylamine (Me 3 TPA‐diamine; 2 ) and 4,4′‐…
Abstract The LDA + U approach can be used essentially as a shift potential to open up the band gap of a semiconductor. This approach was previously applied to the oxygen vacancy in ZnO by Paudel and Lambrecht (PL) [Phys. Rev. B 77 , 205202 (2008)]. Here, we review the results of that approach and introduce additional…
In this work, we explore simultaneous designs of materials selection and structural optimization. As the material selection turns out to be a discrete process that finds the optimal distribution of materials over the design domain, it cannot be performed with common gradient-based optimization methods. In this paper,…
A new class of nematics with high dielectric anisotropy (Δε) for display applications has been developed and characterized by thermal and dielectric methods in mixtures with 3 nematic hosts: ClEster, 6-CHBT, and ZLI-1132. The key structural element is the zwitterionic derivative of the [closo-1-CB9H10]− anion substitu…
We present a theoretical analyses of the fine structure of the band-edge biexciton in nanometer-size crystallites [nanocrystal (NC) quantum dots] of direct semiconductors with a cubic lattice structure or a hexagonal lattice structure, which can be described within the framework of a quasicubic lattice model. The six…
Abstract Radical ring‐opening polymerization has been efficiently used to copolymerize 2‐methylene‐1,3,6‐trioxocane (MTC) and 2‐methylene‐1,3‐dioxepane (MDO). The cyclic ketene acetal MTC was first synthesized and homopolymerized at different temperatures using either 2,2‐azobisisobutyronitrile or dicumyl peroxide as…
Stützt ohne zu stören: Das Aufbringen einer porösen SiO2-Schicht auf Pt-modifizierte TiO2-Nanofasern ergibt einen sinterbeständigen Katalysator (siehe Bild). Die Pt-Nanopartikel sinterten bei Temperaturen bis 750 °C an Luft nicht, weil die SiO2-Schicht die Oberflächenwanderung physikalisch behindert; wegen der Porosit…
A new A(n)B(n)O(3n-2) homologous series of anion-deficient perovskites has been evidenced by preparation of the members with n = 5 (Pb(2.9)Ba(2.1)Fe(4)TiO(13)) and n = 6 (Pb(3.8)Bi(0.2)Ba(2)Fe(4.2)Ti(1.8)O(16)) in a single phase form. The crystal structures of these compounds were determined using a combination of tra…
In this paper we present a method to measure oxygen tracer diffusion coefficients in thin ion conducting films without being limited by slow oxygen incorporation kinetics. The method is based on a two step process. In the first step a substantial amount of 18O tracer is locally incorporated for example into an yttria…