Materials Literature
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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…
A CuO–ZrO2 catalyst of nanometer size was prepared using a simple precipitation technique, assisted by cavitation, and induced by an environmentally friendly ultrasonic technique. BET surface areas of 349.2 m2 g−1 for the as-prepared catalyst and 72.4 m2 g−1 for the catalyst calcined in air at 500 °C were obtained whe…
We propose a hybrid quasicontinuum model which captures both long and short-wave instabilities of crystal lattices and combines the advantages of weakly non-local (higher gradient) and strongly non-local (integral) continuum models. To illustrate the idea, we study the simplest one-dimensional lattice exhibiting comme…
Abstract The polyamide‐6 (PA6)/natural clay mineral nanocomposites were successfully prepared by solid‐state shear milling method without any treatment of clay mineral and additives. PA6/clay mixture was pan‐milled to produce PA6/clay compounding powder, using pan‐mill equipment. The obtained powder as master batch wa…
A biomineralization process based on the promotion of precipitating agent by the urea-urease enzymatic system is developed to prepare ZnAl layered double hydroxide materials and the effects of the enzymatic reaction parameters on the structural and textural properties of the materials are investigated on the basis of…
Abstract Reaction of the [Fe III (CN) 6 ] 3– anion with [Cu II (tn)(H 2 O) n ] 2+ (tn = 1,3‐diaminopropane) affords the compounds [{Cu II (tn)} 2 {Fe II (CN) 6 }] · KCl · 5H 2 O ( 1 ), [{Cu II (tn)} 2 {Fe II (CN) 6 }] · 4H 2 O ( 2 ), and [{Cu II (tnH) 2 (H 2 O) 2 }{Fe II (CN) 6 }] · 2H 2 O ( 3 ). Each iron center in 1…