Materials Literature
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The use of thiol-terminated ligands has recently been reported to enhance 10-fold the power conversion efficiency (PCE) of colloidal quantum dot (CQD) photovoltaic (PV) devices. We find herein that, in a representative amine-capped PbS colloidal quantum dot materials system, improved mobility following thiol treatment…
The ability of random copolymer brushes and cross-linked mats to induce the vertical orientation of domains in overlying films of lamellae- and cylinder-forming block copolymers was investigated as a function of the composition. The substrate-modifying layers consisted of styrene and methyl methacrylate random copolym…
Two planar tetranuclear dysprosium(III) complexes, [Dy(4)(mu(3)-OH)(2)(hmmpH)(2)(hmmp)(2)(Cl)(4)].3MeCN.MeOH (1) and [Dy(4)(mu(3)-OH)(2)(hmmpH)(2)(hmmp)(2)(N(3))(4)].4MeOH (2) {hmmpH(2) = 2-[(2-hydroxyethylimino)methyl]-6-methoxyphenol}, which exhibit an anion-dependent magnetic slow relaxation behavior, have been syn…
Cellulose can be dissolved in precooled (−12 °C) 7 wt % NaOH−12 wt % urea aqueous solution within 2 min. This interesting process, to our knowledge, represents the most rapid dissolution of native cellulose. The results from 13 C NMR, 15 N NMR, 1 H NMR, FT-IR, small-angle neutron scattering (SANS), transmission electr…
Hot electrons in semiconductors lose their energy very quickly (within picoseconds) to lattice vibrations. Slowing this energy loss could prove useful for more efficient photovoltaic or infrared devices. With their well-separated electronic states, quantum dots should display slow relaxation, but other mechanisms have…
The controlled synthesis of high-yield gold nanostars of varying sizes, their characterization, and their use in surface-enhanced Raman scattering (SERS) measurements are reported for the first time. Gold nanostars ranging from 45 to 116 nm in size were synthesized in high yield, geometrically and statistically modele…
Known for more than 150 years, polyaniline is the oldest and potentially one of the most useful conducting polymers because of its facile synthesis, environmental stability, and simple acid/base doping/dedoping chemistry. Because a nanoform of this polymer could offer new properties or enhanced performance, nanostruct…
The study on the mechanism of the shape evolution of nanocrystaline particles is an important and emerging field, which is applicable in the shaped control synthesis of nanoparticles. As an alternative to transmittance electron microscopy (TEM), which is already used in the study of nanoparticles, in this article a si…
A new organic nonlinear optical (NLO) material L-Histidinium trifluoroacetate was crystallized using L-Histidine and trifluoroacetic acid in 1:1 stoichiometric ratio in water-ethanol medium. X-ray diffraction analysis of the single crystals showed that they belong to triclinic system, space group P1, with two molecule…
The Al5O4(-) cluster displays a highly symmetric (D4h) planar ring structure and magic cluster stability. The enhanced stability of this nonstoichiometric cluster is the result of an unconventional electronic distribution within the cluster, which is different from that found in stoichiometric Al2O3. The corresponding…
Abstract This paper reports the anisotropic electrical properties of a layer‐by‐layer (LBL) film composed of water‐soluble conjugated polymers and single‐walled carbon nanotubes (SWNTs). The water‐soluble poly ( p ‐phenylene ethynylene)s (PPEs) are capable of a strong π ‐ π interaction with the sidewall of SWNTs and r…
Selbstzerstörend: Multipodale Goldpartikel entstehen in einer galvanischen Verdrängungsreaktion zwischen AuCl und einem selbstzerstörerischen Templat, das aus einem dreidimensionalen Aggregat magnetischer Eisennanopartikel besteht. Einmalig an diesem System ist, dass das Templat während der Reaktion spontan auseinande…
The present study shows how spectroscopic methods are implemented during the identification of diamonds. Specifically, this article presents the characteristic spectroscopic features and criteria of identification for different types of yellow diamonds, including varieties of naturally occurring yellow color and varie…
We have successfully synthesized bulk nanostructured Fe94.3B5.7 alloy using the one-step approach of a self-propagating high temperature synthesis (SHS) combining a rapid cooling technique. This method is convenient, low in cost, and capable of being scaled up for processing the bulk nanostructured materials. The soli…
Abstract Aniline‐formaldehyde resin modified by adding piperazine (AFP) was prepared in alkaline medium, and its metal polychelates have also been prepared with Mn(II), Co(II), Ni(II), Cu(II), and Zn(II) metal ions. The synthesized compounds were characterized by elemental, spectral (UV–Vis, IR, 1 H‐NMR and 13 C‐NMR),…
The Journal of Phycology was founded in 1965 by the Phycological Society of America. All aspects of basic and applied research on algae are included to provide a common medium for the ecologist, physiologist, cell biologist, molecular biologist, morphologist, oceanographer, taxonomist, geneticist, and biochemist. The…
Effects of various rare‐earth (RE) dopants (Y 3+ , La 3+ , Ce 3+ , Pr 3+ , Nd 3+ , Sm 3+ , Eu 3+ , Gd 3+ , Tm 3+ , Dy 3+ , Er 3+ , and Yb 3+ ) on the dielectric, ferroelectric, and pyroelectric properties of Sr 0.5 Ba 0.5 Nb 2 O 6 (SBN50) ceramics were investigated. In the present studies, the doping concentrations of…
The behavior of a linear polymer chain is studied in a solvent with high affinity for the polymer. The coil dimensions and specific heat are calculated as a function of chain length, solvent concentration, and polymer-solvent attraction strength epsilon(ps). All other interactions are limited to excluded volume repuls…
Electrochemical impedance spectroscopy, step current polarization, and cyclic voltammetry were applied to investigate the activation and deactivation kinetics of oxygen reduction over a novel La 0.8 Sr 0.2 Sc 0.1 Mn 0.9 O 3 (LSSM) cathode material. Oxygen vacancies were created after cathodic polarization for a certai…
A model for predicting the effects of stimuli-induced contraction of the polypyrrole ends of two-segment gold-polypyrrole nanorods on their assembly into curved superstructures is presented. The model and experimental data presented here show that small changes (ca. 3%) in the diameter of the polypyrrole segment of ea…