Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTToroidal Droplet Formation in Polymer-Dispersed Liquid Crystal FilmsGerald H. Springer and Daniel A. HigginsView Author Information Department of Chemistry, Kansas State University Manhattan, Kansas 66506 Cite this: J. Am. Chem. Soc. 2000, 122, 28, 6801–6802Publication…
A new methodology to study the second-order nonlinear optical coefficients of organic materials was developed. The combination of oriented crystal growth (epitaxy or grapho-epitaxy) with grazing incidence X-ray diffraction and second harmonic ellipsometry gives an overview of the relations between the molecular hyperp…
The reactions of Q[Au(acac) 2 ] (Q = N(PPh 3 ) 2 (PPN; a ), NPr 4 ( b ); acac = acetylacetonato) with terminal alkynes of the type HC⋮CC 6 H 4 R-4 in a 1:2 molar ratio affords the complexes Q[Au(C⋮CC 6 H 4 R-4) 2 ] (R = NO 2 ( 1 ), C 6 H 4 NO 2 -4 ( 2 ), ( E )-CH CHC 6 H 4 NO 2 -4 ( 3 )). The same alkynes react with […
This volume compiles information from physics, metallurgy, and mechanical and electrical engineering to epitomize the fundamental characteristics of flat rolling steel. Flat Rolling Fundamentals is drawn from in-depth analyses of metal properties and behaviors to technologies in application. The book provides a full c…
This paper presents the first electrochemical study of Ni(II) secochlorins, chlorophin, and homoporphyrins and demonstrates the influence of macrocycle-rigidity on the site of electroreduction. Oxidations and reductions were investigated by cyclic voltammetry. The measured electrode potentials were found to be depende…
Palladium colloid with a narrow particle size distribution is formed in the reduction of PdCl 4 2- by hydrogen in aqueous solution, using sodium citrate as stabilizer. The absorption spectrum of the Pd particles depends on their content of chemisorbed hydrogen atoms. In the absence of hydrogen, the absorption maximum…
Diatoms are a key component of marine ecosystems and are extremely important for the biogeochemical cycling of silica and as contributors to global fixed carbon. However, the answers to fundamental questions such as what diatoms can sense in their environment, how they respond to external signals, and what factors con…
A CoFe Prussian blue analogue Rb 1.8 Co 4 [Fe(CN) 6 ] 3.3 ·13H 2 O was synthesized, which presents an important photomagnetic effect. The electronic structure and the local structure of the ground and of the excited states have been investigated. X-ray absorption spectroscopy measurements at the Co and Fe L 2,3 edges…
We have studied the competitive epoxidations of olefins with cis - and trans -stilbenes and with cyclooctene and trans -stilbene in iron porphyrin complex-catalyzed epoxidation reactions by H 2 O 2, tert -butyl hydroperoxide ( t -BuOOH), and m -chloroperoxybenzoic acid ( m -CPBA) in protic solvent (i.e., a solvent mix…
We present a theoretical approach to calculate the {\it local} absorption spectrum of excitons confined in a semiconductor nanostructure. Using the density-matrix formalism, we derive a microscopic expression for the non-local susceptibility, both in the linear and non-linear regimes, which includes a three-dimensiona…
We reported a systematic change in the average magnetic relaxation rate, after the application and removal of a 5 T magnetic field, in a polycrystalline sample of La0.5Ca0.5MnO3. Magnetic relaxation measurements and magnetization versus field curves were taken from 10 K to 160 K. The long time behavior of the relaxati…
Coiled-coil motifs provide simple systems for studying molecular self-assembly. We designed two 28-residue peptides to assemble into an extended coiled-coil fiber. Complementary interactions in the core and flanking ion-pairs were used to direct staggered heterodimers. These had "sticky-ends" to promote the formation…
A novel molecular triad, representing an artificial reaction center, was synthesized via linking a fullerene moiety to an array of two porphyrins (i.e., a zinc tetraphenyl porphyrin (ZnP) and a free base tetraphenyl porphyrin (H 2 P)). In this ZnP−H 2 P−C 60 triad, the ZnP performs as an antenna molecule, transferring…
A new experimental method is presented using fluorescein dye to determine the spatial and temporal variations of the liquid volume fraction in aqueous foams. This method is used for quantitative studies of liquid redistribution ( drainage ) in three types of experiments: forced, free, and pulsed drainage. Characterist…
Photoinduced magnetization has been recently evidenced by Hashimoto et al. in CoFe Prussian blue analogues. We synthesized three compounds with a variable cobalt environment to point out the conditions required to observe the photoinduced magnetization. Structure and electronic structure of the compounds have been inv…
The deformation behavior of poly(styrene- b -butyl methacrylate) diblock copolymers, PS- b -PBMA, is studied by high-voltage electron microscopy (HVEM) with an in-situ tensile device. While in the first part the phase behavior of PS- b -PBMA diblock copolymers is investigated via small-angle neutron scattering (SANS),…
Full-potential linear-muffin-tin-orbital molecular-dynamics calculations have been performed to investigate the structures and energies of ${\mathrm{Si}}_{20}$ clusters. Among the selected 15 stable structures for ${\mathrm{Si}}_{20},$ the most stable structure is constructed by stacking ${\mathrm{Si}}_{9}$ tricapped…
As part of the U.S. nonproliferation effort, we are investigating the conversion of the production of fission-product 99 Mo from use of high-enriched uranium (HEU) to low-enriched uranium (LEU). Successful conversion from HEU to LEU (<20% 235 U) requires an irradiation target that contains 5 times more uranium but min…
We report the frequency dependence of linear and nonlinear optical susceptibilities of H−silsesquioxanes of various cage sizes and conformations using the INDO/CI method coupled with the SOS method. The average dynamic refractive index of silsesquioxanes is found to decrease as the cage size increases, and its variati…
Different types of polymers can be intercalated into α-RuCl 3 with different synthetic methodologies. Polyaniline/α-RuCl 3 nanocomposite was prepared by the in situ redox intercalative polymerization method, in which α-RuCl 3 was exposed to an aniline/acetonitrile solution in open air. Water-soluble polymers such as p…