Materials Literature
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Creeping Conformity , the first history of suburbanization in Canada, provides a geographical perspective –both physical and social –on Canada's suburban past. Electronic Format Disclaimer: Two images removed at the request of the rights holder.
Abstract Single crystals of methyl 3‐(4‐methoxyphenyl)prop‐2‐enoate were grown by the slow evaporation technique and vibrational spectral analysis was carried out using near‐IR Fourier transform Raman and Fourier transform IR spectroscopy. Ab initio quantum computations were also performed at the HF/6–311G (d,p) level…
Performance enhancement: The surface-science approach coupled with industrial catalyst research offers a synergistic strategy to improve the performance of industrial catalysts. The poorly understood microscopic processes that determine the structural deactivation of ruthenium-based catalysts during CO oxidation have…
Aligned liquid crystalline nanowires within ordered porous alumina templates show a pronounced texture on a macroscopic scale. We have investigated the influence of the geometric confinement and the nature of the pore walls on the mesophase formation by means of X-ray diffraction. The apparent texture is the result of…
Fine powders of Ca-α‘-SiAlON have been synthesized from the system CaO−Al 2 O 3 −SiO 2, by using an NH 3 −CH 4 gas mixture as a reduction−nitridation agent. Completion of the reduction−nitridation was achieved at low temperatures of 1400−1500 °C without unfavorable particle coarsening or carbon contamination, while th…
Uniform, flexible, wurtzite-type ZnS nanobelts decorated with a ZnS–diethylenetriamine (DETA) hybrid intermediate can be prepared by a mild solvothermal reaction in a solvent mixture consisting of DETA and water (see figure). The volume ratio of DETA to water has a significant influence on the structure, composition,…
Implants invoke inflammatory responses from the body even if they are chemically inert and nontoxic. It has been shown that a crucial precedent event in the inflammatory process is the spontaneous adsorption of fibrinogen (Fg) on implant surfaces, which is typically followed by the presence of phagocytic cells. Intera…
Saddle seen: The use of the potentially tetradentate triethanolamine (teaH3) ligand provides a useful route to three new structural types in mixed-valent manganese cluster chemistry, which include near-rectangular and closed-sinusoidal (saddle-shaped; see structure: MnIII purple, MnII yellow, O red, N blue, C gray) to…
Loopy about magnetism: The use of N-methyldiethanolamine (mdaH2) leads to new Mn12 and Mn4 single-molecule magnets (SMMs) with S=7 and S=9 ground-state spins, respectively. The Mn12 species (see structure: MnIII green, MnII orange, O red, N blue, C gray) is a rare example of an SMM with a loop structure. Its unusual S…
Porphyrins built up from two naphtho[1,2-c]pyrrole subunits and two beta-substituted pyrroles can produce five isomeric dinaphthoporphyrin systems. To gain insights into the effects of ring fusion on extended porphyrin chromophores, all five of these systems were synthesized in isomerically pure form. In four of these…
The conductivity of poly(3,4‐ethylenedioxythiophene):polystyrenesulfonate (PEDOT:PSS) film can be enhanced by more than two orders in magnitude by adding a compound with two or more polar groups, such as ethylene glycol (EG), meso‐erythritol (IUPAC name: 1,2,3,4‐tetrahydroxybutane), or 2‐nitroethanol, into the PEDOT:P…
We studied surface plasmon-coupled emission (SPCE) of semiconductor quantum dots (QDs). These QDs are water-soluble ZnS-capped CdSe nanoparticles stabilized using lysine cross-linked mercaptoundecanoic acid. The QDs were spin-coated from 0.75% PVA solution on a glass slide covered with 50 nm of silver and a 5-nm prote…
ADVERTISEMENT RETURN TO ISSUEPREVNoteNEXTAntimicrobial Behavior of Polyelectrolyte Multilayer Films Containing Cetrimide and SilverJaime C. Grunlan, John K. Choi, and Albert LinView Author Information Department of Mechanical Engineering, Polymer Technology Center (PTC), Texas A&M University, 3123 TAMU, College Statio…
The finite size and interface effects on equilibrium crystal shape (ECS) have been investigated for the case of a surface free energy density including step stiffness and inverse-square step-step interactions. Explicitly including the curvature of a crystallite leads to an extra boundary condition in the solution of t…
A force balance condition to predict quasistatic crack paths in anisotropic brittle materials is derived from an analysis of diffuse interface continuum models that describe both short-scale failure inside a microscopic process zone and macroscopic linear elasticity. The derivation exploits the gradient dynamics and t…
Hollow spheres and thin films of Ni(OH)(2) and NiO with unusual form and hierarchical structures have been synthesized by a simple solution chemistry method. First, in situ formed Ni(OH)(2) nanoflakelets organized on the surface of styrene-acrylic acid copolymer (PSA) latex particles to form core/shell structures. Ni(…
Deprotonation of polycarboxylic acids induces the self-assembly of terpyridylplatinum(II) complexes (see picture) and triggers remarkable changes in the UV/Vis spectra and emission intensities. The changes in the electronic spectra arise from metal-metal-to-ligand charge transfer transitions resulting from the aggrega…
With the aim of developing a computationally inexpensive method for modeling the high-temperature reaction dynamics of transition metal catalyzed reactions we have developed a ReaxFF reactive force field in which the parameters are fitted to a substantial quantum mechanics (QM) training set, containing full reaction p…
Cytotoxicity of CdSe and CdSe/ZnS nanoparticles has been investigated for different surface modifications such as coating with mercaptopropionic acid, silanization, and polymer coating. For all cases, quantitative values for the onset of cytotoxic effects in serum-free culture media are given. These values are correla…
A phosphor material, Y1-xEuxCa4O(BO3)3 (0⩽x⩽1) film, was fabricated on SiO2 substrates by the combinatorial laser molecular-beam epitaxy method. Photoluminescence (PL) and PL decay were measured for this film library to identify the optimum composition as well as to determine the luminescence mechanism. Results showed…