Materials Literature
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Density-functional calculations of the adsorption of molecular hydrogen on a planar graphene layer and on the external surface of a (4,4) carbon nanotube, undoped and doped with lithium, have been carried out. Hydrogen molecules are physisorbed on pure graphene and on the nanotube with binding energies about 80-90 meV…
Inside out: Corrosive pitting and etching can be combined in a simple, elegant, and powerful method to transform single-crystal Pd nanocubes into nanoboxes (see SEM image) and nanocages in a one-pot synthesis without the involvement of exotic templates. Emptying the interiors enables the surface plasmon resonance peak…
Abstract In der jüngsten Vergangenheit ist das Interesse an der Katalyse mit Nanopartikeln (NPs) stark gestiegen, wie zahlreiche Publikationen auf diesem Gebiet aus den letzten fünf Jahren belegen. Dieser Bereich der “semi‐heterogenen” Katalyse bildet die Nahtstelle zwischen homogener und heterogener Katalyse. Aktuell…
Interest in catalysis by metal nanoparticles (NPs) is increasing dramatically, as reflected by the large number of publications in the last five years. This field, "semi-heterogeneous catalysis", is at the frontier between homogeneous and heterogeneous catalysis, and progress has been made in the efficiency and select…
We reformulate the theory of mechanism-based strain gradient plasticity (MSG) [J. Mech. Phys. Solids 47 1239 (1999); ibid 48 99 (2000); J. Mater. Res. 15 1786 (2000)] that involves the third-order tensor of higher-order stress to a much simpler version within Fleck and Hutchinson's theoretical framework of strain grad…
Abstract The need for a safe and cost effective conveyance method in horizontal well logging increased with the increase in the number of horizontal wells and their horizontal section length. Coiled tubing was initially used for conveyance, however it has a limited reach and the operations are complicated with some op…
Elektrooptische Chromophore mit verdrehtem π-System und außergewöhnlichen molekularen Hyperpolarisierbarkeiten (−488 000×10−48 esu bei 1907 nm) wurden entworfen und synthetisiert. Die Kristallstrukturanalyse deckt große Verdrillungswinkel und einen hoch ladungsgetrennten zwitterionischen Grundzustand auf. Experimente…
Ausgehend von einfachen Metallacetaten sind bimetallische Heterocubane des Typs [O4] zugänglich (siehe Struktur, M1,2=Mn, Co, Ni, Zn), die sich wiederum als Vorstufen für die selektive Bildung von Bimetalloxid-Nanopartikeln mit kontrollierter Zusammensetzung eignen. Die Partikelgrößen lassen sich über die Thermolysete…
Mit einer einfachen Brücke ein schwieriges architektonisches Problem gelöst: Der Ligand H4tpaen mit einem Ethylendiaminrückgrat enthält zehn Donoratome, die Lanthanoide komplexieren und so die zehnfach koordinierten Metallzentren effektiv vor Wechselwirkungen mit Solvensmolekülen schützen. Dies hat zur Folge, dass EuI…
Abstract Summary: The fracture toughness of EMC was dramatically increased over a wide temperature range by the addition of a very low volume fraction of layered silicates to EMC filled with micro‐silica particles. Layered silicate‐EMC nanocomposites containing intercalated and the exfoliated silicates were fabricated…
The reaction of Ni atoms with molecular oxygen has been reinvestigated experimentally in neon matrices and theoretically at the DFT PW91PW91/6311G(3df) level. Experimental results show that i) the nature of the ground electronic state of the superoxide metastable product is the same in neon and argon matrices, ii) two…
A novel type of inorganic fullerene-like nanoparticle has been synthesized, presenting the unique structure of a closed, nested nanobox. These nanoparticles consist of WS2, and are obtained by spray pyrolysis of (NH4)2WS4 solutions at high temperature. The nanoparticles exhibit the shoebox shape of a rectangular paral…
The total gas holdup and the holdup of large gas bubbles were predicted in bubble column reactors (BCRs) and slurry bubble column rectors (SBCRs) using two Back-Propagation Neural Networks (BPNNs). Over 3880 and 1425 data points for gas holdup and Large gas bubble holdup respectively, covering wide ranges of gas-liqui…
Zinc oxide-layered titanate nanohybrids with a 1 ratio 1 ordered heterostructure have been successfully synthesized by reassembling exfoliated titanate nanosheets in the sol solution of zinc acetate under hydrothermal conditions.
The magnetic and electrical transport properties of ferromagnetic semiconductor ${\mathrm{Mn}}_{1\ensuremath{-}x}{\mathrm{Cr}}_{x}\mathrm{Te}$ ($x=0.04$, 0.08, and 0.14) compounds have been investigated. These compounds have ferromagnetic behavior with hysteresis loops showing a coercivity of $300--985\phantom{\rule{0…
We use neutron diffraction to probe the magnetization components of a crystal of Mn12 single-molecule magnets. Each of these molecules behaves, at low temperatures, as a nanomagnet with spin S = 10 and strong anisotropy along the crystallographic c axis. The application of a magnetic field H(perpendicular) perpendicul…
Abstract A novel biodegradable unimolecular reversed micelle consisting of a poly( L ‐lactide) (PLA) shell and a hyperbranched D ‐mannan (HBM) core, that is, a chestnut‐shaped polymer (PLA–HBM), was synthesized by the polymerization of L ‐lactide on HBM with 4‐(dimethylamino)pyridine (DMAP) as the catalyst. The obtain…
A schematic diagram is shown for fabricating macroporous, crosslinked polystyrene monoliths.
Novel ABA-type amphiphilic triblock copolymers composed of poly (ethylene glycol) (PEG) as hydrophilic segment and poly (2,2-dimethyltrimethylene carbonate) (PDTC) as hydrophobic segment were synthesized by ring-opening polymerization of 2,2-dimethyltrimethylene carbonate (DTC) initiated by dihydroxyl PEG. The influen…
Unique structured Au nanowhiskers were fabricated via electroless metal deposition on Si wafer in KAuCl4–HF solution. A self-assembled localized microscopic electrochemical cell model and a diffusion-limited aggregation process are associated with the formation of Au nanowhiskers. A green photoluminescence (PL) band w…