Materials Literature
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The relative phase shift of light transmitted through a liquid crystal television (LCTV) panel as a function of the applied voltage on the LCTV can be obtained by writing a Ronchi grating pattern to the LCTV and measuring the intensities in the diffraction pattern at the Fourier plane combined with the amplitude modul…
The optical absorption spectra of a series of small gold clusters and their cations have been measured, between 1.9 and 5.6 eV, using a method based upon the photodepletion of a molecular beam of their van der Waals complexes containing one and two xenon atoms. This method provides size-specific information even thoug…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTCoated Semiconductor Nanoparticles: The CdS/PbS System's Photoluminescence PropertiesH. S. Zhou, H. Sasahara, I. Honma, H. Komiyama, and Joseph W. HausCite this: Chem. Mater. 1994, 6, 9, 1534–1541Publication Date (Print):September 1, 1994Publication History Published online1…
Time-resolved velocity interferometry measurements have been made on boron carbide and silicon carbide ceramics to assess dynamic equation-of-state and strength properties of these materials. Hugoniot pecursor characteristics, and post-yield shock and release wave properties, indicated markedly different dynamic stren…
Assuming a saturated ferromagnet, the anomalous crystal structures of the magnetic 3d transition elements Fe, Co, and Ni are explained from simple band-filling arguments. The full-potential linear muffin-tin orbital (FP-LMTO) method is used to calculate the elastic constants (${\mathit{C}}_{11}$, ${\mathit{C}}_{12}$,…
Tomatoes at the turning stage of maturity were coated with corn-zein (CZ) protein film of 5 (0.20), 15 (0.61) and 66 μm (2.60 mil) thickness. O2 transmission rate at 0% RH and 30C and CO2 transmission rate at 0% RH and 21C of protein film were much lower than those of a typical shrink wrap film at 0% RH and 23C. Where…
The article describes molecular dynamics simulations of 4-n-pentyl-4′-cyanobiphenyl (5CB) in the nematic phase at 300 K using two interaction models. The first model comprises united atoms, while in the second, shorter simulation, the hydrogen atoms are explicitly included. Liquid crystalline order parameters were cal…
The space charge measurement technique may be applied to diagnostic technology for high-voltage machines in the near future. The authors review the progress in the various methods of space charge measurement in Japan.>
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTThird-Order Nonlinear Optical Properties of Soluble Octasubstituted MetallophthalocyaninesMaria A. Diaz-Garcia, Isabelle Ledoux, Jose A. Duro, Tomas Torres, Fernando Agullo-Lopez, and Joseph ZyssCite this: J. Phys. Chem. 1994, 98, 35, 8761–8764Publication Date (Print):Septem…
Abstract The use of magnesium hydroxide as a fire‐retardant additive in polymers is discussed in terms of its particle characteristics, thermal properties and factors influencing the mechanism of action. Consideration is also given to its role in reducing smoke evolution during polymer combustion.
To understand the role of type V collagen and its spatial interrelationship with type I collagen in bone matrix, the molecule's covalent intermolecular cross-links were structurally characterized. Type V collagen containing alpha 1(V), alpha 2(V) and alpha 1(XI) chains was isolated from bovine bone and reacted with Na…
Ferroelectric BaTiO 3 thin films were prepared on Pt(111)/ SiO 2 /Si(100) substrates at 650° C by the sol-gel method. Film thickness could be varied by repeating a dip coating/heating cycle. The texture of the BaTiO 3 thin films became more dense and homogeneous when the film thickness increased. The crystalline thin…
The mean size of colloidal lead sulfide particles in nanocomposites with organic materials was varied from 4 to 80 nm by addition of sodium dodecyl sulfate or acetic acid. The refractive index and absorption coefficients of the resulting nanocomposites were measured at 632.8 and 1295 nm. The refractive index of the re…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTLigand K-Edge X-ray Absorption Spectroscopy as a Probe of Ligand-Metal Bonding: Charge Donation and Covalency in Copper-Chloride SystemsSusan E. Shadle, Britt Hedman, Keith O. Hodgson, and Edward I. SolomonCite this: Inorg. Chem. 1994, 33, 19, 4235–4244Publication Date (Prin…
Abstract The hydroxyl stretching region of two montmorillonites (SW y-1 , Crook County, Wyoming, USA, and JP, Jelšový Potok, Slovakia) and a ferruginous smectite (SW a-1 , Grant County, Washington, USA) have been analysed using decomposition and curve-fitting. The positions and integrated intensities of component band…
Crystal structures are reported for the sterically crowded porphyrin Copper(II) 2,3,7,8,12,13,17,18-octaethyl-5,10,15,20-tetraphenylporphyrin (Cu(OETPP), 1) and its π cation radical Cu(OETPP).+ClO4- (2). 1 was chosen to assess the consequences of oxidation in a nonplanar porphyrin on the expectation that its multiple…
Abstract Bioabsorbable poly(ester‐urethane) networks were synthesized from ethyl 2,6‐diisocyanatohexanoate ( L ‐lysine diisocyanate) (LDI) and a series of polyester triols. LDI was synthesized by refluxing L‐lysine monohydrochloride with ethanol to form the ester, which was subsequently refluxed with 1,1,1,3,3,3‐hexam…
ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTA Neutron Reflectivity Investigation of Surface and Interface Segregation of Polymer Functional End GroupsJ. F. Elman, B. D. Johs, T. E. Long, and J. T. KobersteinCite this: Macromolecules 1994, 27, 19, 5341–5349Publication Date (Print):September 1, 1994Publication History P…
Similarities of large electromechanical coupling factors ( k s ) in perovskite binary material systems were studied. Five large- k s material systems, PZT 53/47, PZNT 91/9, PMNT 67/33, PSTT 55/45 and PSNT 57/43, were compared. These five large-ks material systems were found to show four similarities: rhombohedral and…
A system of averaged equations describing the motion of a mixture of spherical compressible bubbles in an inviscid liquid is derived by the ensemble-averaging method introduced in an earlier paper [Zhang and Prosperetti, J. Fluid Mech. 267, 185 (1994)]. The averaging procedure introduces new terms in the equations, am…