Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTMononuclear Organomolybdenum(VI) Dioxo Complexes: Synthesis, Reactivity, and Catalytic ApplicationsFritz E. Kühn, Ana M. Santos, and Marta AbrantesView Author Information Instituto Tecnológico e Nuclear (ITN), Estrada Nacional No. 10, 2686-953 Sacavem, Portugal Cite this: Ch…
In this paper, we propose a PDE-based level set method. Traditionally, interfaces are represented by the zero level set of continuous level set functions. Instead, we let the interfaces be represented by discontinuities of piecewise constant level set functions. Each level set function can at convergence only take two…
On the basis of the consideration of "host-guest" chemistry, the interactions between guest molecules are highlighted in the synthesis of nonsiliceous mesoporous materials by the "soft-template" and "hard-template" approaches. A generalized "acid-base pair" concept is utilized in selecting appropriate guest molecules…
Electroluminescence of the CO<sub>2</sub> laser annealed PECVD-grown silicon-rich silicon oxide (SRSO) based metal-oxide-semiconductor diode with embedded Si nanocrystals is demonstrated. The structural and optical properties of a CO<sub>2</sub> laser rapid thermal annealed Si-rich SiO<sub>1.25</sub> film are investig…
Spherical Si and SnOx nanoparticles in the size range between 3 and 30nm have been synthesized by microwave induced decomposition of silane and gas phase condensation, respectively. They are deposited on thin metal films and investigated by electron microscopy, Auger electron, and electron energy loss spectroscopy. An…
Abstract A method for synthesizing triangular dithiolene‐bridged trinuclear cluster complexes [{LM(S 2 C 6 H 4 )}Ru 2 (CO) 4 (S 2 C 6 H 4 )] [M = Rh, L = (η 5 ‐C 5 Me 5 ); M = Ir, L = (η 5 ‐C 5 Me 5 ); M = Ru, L = (η 6 ‐C 6 Me 6 )] by complete reconstruction of the metal framework was developed. The complexes thus obt…
Room-temperature dispersion relations of the phonon modes associated with lead ion vibrations in ferroelectric ${\mathrm{PbTiO}}_{3}$ single crystal have been investigated using inelastic neutron scattering. Both transverse acoustic and transverse optic modes propagating in the direction perpendicular to the spontaneo…
Multiplicity of the liquid-liquid phase transitions in supercooled water, first obtained in computer simulations [Brovchenko et al., J. Chem. Phys. 118, 9473 (2003)], has got strong support from the recent experimental observation of the two phase transitions between amorphous ices [Loerting et al., Phys. Rev. Lett. 9…
The effect of solvent quality on the behavior of a polyelectrolyte chain near a charged surface is studied using molecular dynamics simulation with explicit solvent. The polyion adsorbs completely on the surface for a high enough surface charge density, and the surface charge required for complete adsorption becomes l…
Closure of the two domains of 3-phosphoglycerate kinase, upon substrate binding, is essential for the enzyme function. The available crystal structures cannot provide sufficient information about the mechanism of substrate assisted domain closure and about the requirement of only one or both substrates, since lattice…
[reaction: see text] The synthesis, photophysical properties, and structural characterization of a photodimerizable ditopic ligand are described. Upon irradiation at 366 nm, ligand 1 dimerizes to the head-to-tail tetra-bpy ligand 2. This thermally stable photodimer can be dissociated back to 1 using higher energy irra…
Abstract Product engineering problems are considered that arise in the use of batch crystallization processes. Specifically forward and reverse process functions are identified that in the forward direction enable the calculation of product crystal size distributions (CSDs) from specified operating conditions, and in…
NiAl 2 O 4 /SiO 2 and Co 2+ ‐doped NiAl 2 O 4 /SiO 2 nanocomposite materials of compositions 5% NiO – 6% Al 2 O 3 – 89% SiO 2 and 0.2% CoO – 4.8% NiO – 6% Al 2 O 3 – 89% SiO 2 , respectively, were prepared by a sol–gel process. NiAl 2 O 4 and cobalt‐doped NiAl 2 O 4 nanocrystals were grown in a SiO 2 amorphous matrix…
Abstract When N ,α‐dimethyl‐α‐(4‐[2.2]paracyclophanyl)nitrone ( 1 ) is treated with dimethyl acetylenedicarboxylate ( 5 ), phenyl isocyanate ( 9 ), benzyne ( 13 ), or ethyl propiolate ( 16 ), the [2.2]paracyclophane‐based pyrrole 6 , imidazole 10 , and isoxazole derivatives 14 , 15 , and 17 are formed in good yields.…
Abstract A simple and facile fluorous biphasic catalytic oxidation of alkenes and aldehydes with 1 atm of air and 2‐methylpropanal in the presence of the (β‐perfluoroalkylated tetraphenylporphyrin)cobalt complexes [Co{TPP(C 8 F 17 ) 4 }] ( Co2 ) has been demonstrated for the first time. This kind of β‐perfluoroalkylat…
We report magnetic, structural, and electrical properties of Cr-doped CdTe crystals grown by the vertical solidification method. High-resolution x-ray diffraction showed a single phase with a zinc-blende structure of lattice constant ∼6.481Å. It exhibited ferromagnetism with temperature-dependent magnetization. The fe…
Ordered, tightly packed aryl-azide-terminated, self-assembled monolayers (SAMs) were created on gold substrates from a new disulfide precursor. These monolayers were reduced at least partially in an aqueous environment using approximately 2 nm CdS quantum dots (Qdots) as photocatalysts to give mixed monolayers of aryl…
This article demonstrates the characterization of field emission from individual carbon nanotubes (CNTs) attached to a tungsten tip, when the separation distance s between the anode and tip of the CNT (cathode) is less than 15μm. The separation distance is adjusted with a nanopositioning stage after establishing a dat…
2,3,4,5-Tetrakis(dimethylsilyl)thiophene ( 1 ), the first 2,3,4,5-tetrasilylthiophene, was synthesized by the reaction of 2,3,4,5-tetrabromothiophene with chlorodimethylsilane in the presence of magnesium and a catalytic amount of copper(I) cyanide. The dimethylsilyl groups of 1 considerably affect the structure and t…
C(3)-symmetric, octopolar 1,3,5-alkynylbenzenes with terminal pyridyl substituents are presented which show an increase up to 17-fold in the second-order NLO activity upon protonation while maintaining their octopolar character, as confirmed by the depolarization ratios measured.