Materials Literature
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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…
Films containing soy protein and wheat gluten were exposed to simulated farmland soil mix over a period of 30 days and monitored for degradation. The simulated farmland soil mix (topsoil/sand/Sunshine compost/vermiculite, 59:6:25:10, wt %) was mixed and stored at ambient humidity (48-55%) and temperature (20-24 degree…
Several oligothiophenes with 2-mesitylthio (MesS) substituents have been prepared and studied by UV−visible spectroscopy and cyclic voltammetry. These compounds can be considered as models for thiol-terminated conjugated oligomers, which have attracted intense interest as materials for molecular-scale electronics. Thr…
A series of 6-substituted indolinobenzospiropyrans were resolved by chiral stationary phase HPLC and rate constants k rac for their thermal racemization were measured by circular dichroism spectropolarimetry at 60 °C in three different solvents: cyclohexane, 90:10 hexanes/2-propanol, and acetonitrile. Results show tha…
Hydrogen adsorption in porous materials is one of the methods actively being studied to store hydrogen on board vehicles driven by fuel cells. Recent experiments and numerical simulations have shown that adsorbent materials appropriate to hydrogen storage could be made up of carbon nanotubes. In this work we study the…
A Fano resonance mechanism is evidenced to control the formation of optical Fermi-edge singularities in multi-subband systems such as remotely doped AlxGa1-xAs heterostructures. Using Fano parameters, we probe the physical nature of the interaction between Fermi-sea electrons and empty conduction subbands. We show tha…
An analysis of the morphological behavior of substrate-supported diblock copolymer films for thicknesses t below the equilibrium period L 0 of the copolymer is presented. Substrate-supported films generally exhibit dissimilar interactions between the copolymer block components and the free and substrate surfaces. Acco…
Micropatterned thin films have received increased interest in the past few years. Besides preparation by conventional lithography, self-assembly of materials around a template can be used for patterning. Recently a method that utilizes the condensation of micrometer-size water droplets on solutions of block copolymers…
Gelatin samples, native and chemically crosslinked with three different diisocyanates, were studied by bending-creep measurements. These samples were characterized by the number-average molecular weight of a chain segment between two points of crosslinkage Mc. The chemical network was found to contribute to a marked e…
Different modified polyamide (MPA) and modified polyethylene (MPE) resins were prepared by reactive extrusion of different contents of a compatibilizer precursor (CP) with either polyamide (PA) or polyethylene (PE). The MPE and MPA resins were then blow-molded with designed amounts of PA or PE resins to prepare four d…
The first layered vanadium borophosphate (imidazolium)3.8(H3O)1.2[(VO)4(BO)2(PO4)5].0.3H2O (1) has been synthesized hydrothermally and characterized by chemical analysis, infrared and Raman spectroscopy, and thermogravimetric and magnetic measurements. The compound crystallizes in the monoclinic space group C2/c, a =…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTEffect of Macromolecular Isomerism on the Photomodulation of Dendrimer PropertiesSheng Li and Dominic V. McGrathView Author Information Department of Chemistry, University of Arizona Tucson, Arizona 85721 Cite this: J. Am. Chem. Soc. 2000, 122, 28, 6795–6796Publication…
The effect of electron beam irradiation on the properties of carbon black-, silica-, and clay-filled fluorocarbon rubber has been studied over a range of radiation doses, loadings, and nature of the fillers. Compared to the unfilled irradiated rubber, the tensile strength and modulus improve with a decrease in the par…
Viscoelastic models were employed to analyze the stress–strain behavior of cotton, acrylic, and polyester yarns. The potential model and the modified Maxwell model gave the best fits as regards the stress–strain behavior of these yarns. The results of the potential model resembled those of the modified Maxwell model w…
Functionalized hyperbranched poly(siloxysilane)s have been prepared by hydrosilylation reactions involving the multiple silicon hydride (SiH) groups of the polymer to introduce other reactive groups such as epoxy, amine, and hydroxyl groups. The possible use of these modified polymers as novel crosslinking agents is d…