Materials Literature
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ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTA Dual Fluorescence Temperature Sensor Based on Perylene/Exciplex InterconversionNirmala Chandrasekharan and Lisa A. KellyView Author Information Department of Chemistry and Biochemistry University of Maryland, Baltimore County Baltimore, Maryland 21250 Cite this: J. A…
A mixed quantum mechanics/molecular mechanics (QM/MM) model is used for investigating the nature of molecular hydrogen adsorption in pure and alkali-metal-doped single-walled carbon nanotubes (SWNTs). Our results demonstrate that the charge transfer from the alkali metal to the tube polarizes the H 2 molecule and this…
We introduce a dissipative particle dynamics scheme for the dynamics of nonideal fluids. Given a free-energy density that determines the thermodynamics of the system, we derive consistent conservative forces. The use of these effective, density dependent forces reduces the local structure as compared to previously pro…
Microlithographic objectives have been developed for deep ultraviolet and vacuum ultraviolet wavelengths used for printing and inspection applications related to microlithographic processes. Refractive and catadioptric design solutions using fused silica, calcium fluoride and other crystals are discussed. Several refl…
Recent synthesis and NMR spectroscopy of neutral Ir(V) complexes hydridotris(3,5-dimethylpyrazol-1-yl)borato tetrahydride (Tp*IrH(4)) and hydridotris(pyrazol-1-yl)borato tetrahydride (TpIrH(4)) have been interpreted as supporting face-capped octahedral structures (C(3upsilon)) with each of three Ir-H bonds trans to an…
Abstract Spandex fibers were obtained by melt spinning segmented copolyetheresteramides with crystallizable aromatic diamide units of uniform length and poly(tetramethyleneoxide) segments. The aramid content was varied from 3 to 22 wt %, and the molecular weight of the polyether segment ranged from 1000 to 9000 g/mol.…
An ab initio coupled perturbed Hartree−Fock study has been performed to investigate the hyperpolarizabilities β of a series of heteroaromatic-substituted sym -triazines in the frame of a tensorial formalism. Effects of donor or acceptor substitution and electron correlation on the octupolar triazines have also been ex…
The effect of anionic surfactants (single-chained sodium n -dodecyl sulfate (SDS), asymmetric double-chained sodium bis(2-ethylhexyl) sulfosuccinate (AOT), and two-headed disodium oleoamido PEG-2 sulfosuccinate) on the crystallization process of calcium hydrogen phosphate dihydrate (DCPD) was investigated. All surfact…
The hyperthermophilic archaeon Pyrococcus furiosus can utilize different carbohydrates, such as starch, maltose and trehalose. Uptake of alpha-glucosides is mediated by two different, binding protein-dependent, ATP-binding cassette (ABC)-type transport systems. The maltose transporter also transports trehalose, wherea…
A novel synthetic process was developed to yield optically active polyaniline derivatives (PANIs) prepared by electron acceptor, 2,3-dichloro-5,6-dicyanobenzoquinone (DDQ), using either (+)- or (−)-camphorsulfonic acid (CSA) as the chiral inductor in organic media. Either thin films of PANIs/(+)-CSA and PANIs/(−)-CSA…
We analyze various potential environments such as electrodes, substrates, gate voltages, and flattening deformations in single-wall C nanotubes in terms of circumferential perturbations on nanotube surfaces. Considering the periodicity of perturbations, we derive selection rules in the subband mixing caused by perturb…
Abstract This study reports the results of investigations on blends of silicone rubber and fluororubber based on tetrafluoroethylene/propylene/vinylidene fluoride terpolymer and the effects of replacement of silicone rubber and/or fluororubber in their 50/50 blend by the respective vulcanizate powders of known composi…
Abstract The formation of covalent bonds between silanols in copolymer and those in silica prevents organic–inorganic phase separation. Two series of hybrid composite materials, poly(vinyl acetate‐ co ‐vinyl trimethoxysilane)/TEOS and poly[vinyl acetate‐ co ‐3‐(trimethoxysilyl)propyl methacrylate]/TEOS, were fabricate…
To better characterize the cis state and the reorientation processes in polymers containing azobenzene groups, the in situ dynamics of photoinduced orientation of a polymer with azobenzene groups bearing no donor and acceptor substituents such as poly[4-[2-(methacryloyloxy)ethyl]azobenzene] polymer (pMEA) was carried…
The pressure-induced structural changes of single-wall carbon nanotubes organized into two-dimensional crystalline bundles are studied by neutron diffraction up to $\ensuremath{\sim}50 \mathrm{kbar}.$ The strong variation of the (10) Bragg peak position with pressure is interpreted as a progressive deformation of the…
Abstract We prepared pullulan/poly(vinyl alcohol) (PVA) blend films by casting the polymer solution in dimethyl sulfoxide. Their morphology and mechanical properties were investigated. Scanning electron micrographs revealed that the pullulan was immiscible with PVA over the entire composition range. The tensile streng…
Methyltrioxorhenium(VII) (MTO) forms octahedral adducts with bidentate Lewis bases. These complexes were isolated and fully characterized, including X-ray crystallography. The compounds display distorted octahedral geometry in the solid state with a tendency of disorder concerning the Re central atom. At elevated temp…
Abstract The tensile properties of Argiope trifasciata (Argiopidae) drag line silk retrieved from mooring threads in the web were characterized. Scanning electron microscope images were used to determine the cross‐sectional area of the samples, allowing force‐displacement plots to be rescaled as stress–strain curves a…
Abstract The nonisothermal crystallization kinetics of polyoxymethylene (POM), polyoxymethylene/Na–montmorillonite (POM/Na–MMT), and polyoxymethylene/organic–montmorillonite (POM/organ–MMT) nanocomposites were investigated by differential scanning calorimetry at various cooling rates. The Avrami analysis modified by J…
Photosensitization of Porphyrins and Phthalocyanines covers the scentific background to porphyrins and phthalocyanines, and applications of the compounds, especially for the application for photosensitization. It also has a review of advances in research and applications in this field.