Materials Literature
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The crystal structure of synthetic damaraite, Pb 3 O 2 (OH)Cl (orthorhombic, Pmc2 1 , a = 5.8052(7), b = 6.9025(8), c = 15.141(2) A, V = 606.7(1) A 3 has been solved by direct methods and refined to R1 = 0.039. The crystal structure of synthetic mendipite, Pb 3 O 2 Cl 2 (orthorhombic, Pnma, a = 11.879(7), b = 5.808(4)…
Resonant x-ray scattering has been used to investigate the interlayer ordering of the antiferroelectric and ferrielectric smectic C* subphases in a device geometry. The liquid crystalline materials studied contain a selenium atom and the experiments were carried out at the selenium K edge allowing x-ray transmission t…
The Army Research Office (ARO) has been supporting projects focusing on basic research in the area of smart materials and adaptive structures over recent years. A major emphasis of the ARO's Structures and Dynamics Program has been on the theoretical, computational, and experimental analysis of smart structures and st…
Organic coatings are widely used to protect metal surfaces from corrosion. The effectiveness of such coatings is dependent not only on the properties of the coatings, which are related to the polymeric network and possible flaws in this network, but also on the character of the metal substrate, the surface pretreatmen…
Spin-resolved photoemission measurements from polycrystalline NiMnSb films reveal spin-resolved density of states which are in qualitative agreement with local spin density functional band structure calculations [Phys. Rev. B 51, 10 436 (1995)]. The polarization of electrons close to the Fermi level is however found t…
A relationship between the dimensionless thermoelectric figure of merit, ZT , and the ratio of the open-circuit temperature difference, Δ T o , and the short-circuit temperature difference, Δ T s , is reported. Equivalent relationship between ZT and the open circuit voltage, V o , and short-circuit current, I s , are…
Organocobalt derivatives of tetracationic water-soluble porphyrins are difficult to prepare via the typical reductive alkylation of the Co(II)(por) (porH(2) = porphyrin ligand). None have been reported. The problem may arise because the porphyrin core is made relatively electron poor by the positively charged peripher…
Hurricane damage inflicted upon coastal structures, particularly residential structures, results in millions of dollars in financial damage and loss of life each year. A major cause of this damage usually begins with roof uplifts of coastal structures; prevention of roof uplift helps mitigate damage to coastal structu…
The revised general solubility equation (GSE) is used along with four different methods including Huuskonen's artificial neural network (ANN) and three multiple linear regression (MLR) methods to estimate the aqueous solubility of a test set of the 21 pharmaceutically and environmentally interesting compounds. For the…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTSelf-Organization of Large Gold Nanoparticle ArraysBeomseok Kim, Steven L. Tripp, and Alexander WeiView Author Information Department of Chemistry, Purdue University 1393 Brown Building, West Lafayette, Indiana 47907-1393 Cite this: J. Am. Chem. Soc. 2001, 123, 32, 795…
We have used a full-potential linear muffin-tin orbital method to calculate the effects of oxygen impurities on the electronic structure of NiAl. Using the supercell method with a 16-atom supercell we have investigated the cases where an oxygen atom is substitutionally placed at either a nickel or an aluminum site. Fu…
We suggest an approach to the problem of free electron spin evolution in a semiconductor with arbitrary anisotropy or quantum structure in a magnetic field. The developed approach utilizes quantum kinetic equations for average spin components. These equations represent the relaxation in terms of correlation functions…
A novel carbon nitride compound, structurally related to the proposed graphitic phase of C(3)N(4), has been synthesized in a bulk well-crystallized form. The new material, with stoichiometry C(6)N(9)H(4)Cl, was prepared through a solid-state reaction of 2,4,6-triamino-1,3,5-triazine with 2,4,6-trichloro-1,3,5-triazine…
The current state of spontaneous formation of self-assembled monolayers (SAMs) on different substrates as well as on nanoparticles (referred to as monolayer-protected clusters, MPCs) is surveyed. Attention is then focused onto the assembly and self-assembly of nanoparticles (including MPCs), polymers, and polyelectrol…
Abstract For Abstract see ChemInform Abstract in Full Text.
Temperature induced surface transitions observed in nematic liquid crystals oriented by obliquely evaporated SiOx are analyzed. It is shown that the experimental data can be interpreted with a theory for the thermal renormalization of the anisotropic part of the surface energy based on the mean field approximation. By…
Abstract This paper addresses the finite element modelling of surface tension. The external stress vectors associated with surface tension are assumed proportional to the average curvature and oriented along the normal vector to the fluid surface. The issue of estimating the average curvature of a discretized surface…
The molecular weight of hyperbranched polyesters, prepared by condensation polymerization of the AB 2 monomer dimethyl 5-(2-hydroxyethoxy)isophthalate in the presence of either a B 3 core (trimethyl 1,3,5-benzenetricarboxylate) or a B 2 core (dimethyl isophthalate), was controlled by varying the core-to-monomer ratio.…
Abstract The effects of three dihydric phenols on the thermal properties of poly‐(ε‐caprolactone) (PCL) were investigated by DSC. The thermal properties of PCL were found to be greatly modified by the addition of 4,4′‐dihydroxydiphenyl ether (DHDPE). When the content of DHDPE reached 40%, PCL that was a semicrystallin…
Al-containing mesoporous silica hard spheres of 30−50 μm mean diameter have first been synthesized at room temperature in 80 min using 1-alkylamine as a structure-directing agent. The formation of the spheres occurs only within a definite range of molar synthesis compositions of Si, Al, HCl, H 2 O, and 1-alkylamine, e…