Materials Literature
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Abstract Regenerated Antheraea pernyi silk fibroin films prepared from calcium nitrate solution were treated with heat for crystallization. The structural and conformational changes caused by heat treatment were investigated with X‐ray diffraction, infrared spectroscopy, and differential scanning calorimetry. The temp…
Abstract Poly(β‐hydroxybutyrate) (PHB) is a bacteria storage biodegradable polyester that is considered to be a natural substitute for synthetic thermoplastics in many applications. However, brittleness hampers its utility. This study shows that oriented elastic fibers of PHB with favorable mechanical properties (360‐…
The synthesis, structure, and physical characterization of two new radical salts formed with the organic donor bis(ethylenethia)tetrathiafulvalene (BET-TTF) and the octahedral anions hexacyanoferrate(III), [Fe(CN)(6)](3-), and nitroprusside, [Fe(CN)(5)NO](2-), are reported. These salts are (BET-TTF)(4)(NEt(4))(2)[Fe(C…
ADVERTISEMENT RETURN TO ISSUEPREVCommunicationNEXTOne-Electron Reduction of an Antiferromagnetically Coupled Triradical Yields a Mixed-Valent Biradical with Enhanced Ferromagnetic CouplingDavid A. Shultz and R. Krishna KumarView Author Information Department of Chemistry North Carolina State University Raleigh, North…
Abstract p ‐Phenylenediamine was chemically attached to low molecular weight chlorinated paraffin wax. The polymer‐bound p ‐phenylenediamine was characterized by vapor‐phase osmometry (VPO), proton magnetic resonance spectroscopy ( 1 H‐NMR), infrared spectroscopy (IR), and thermogravimetric analysis (TGA). The efficie…
The interaction of a hydroxyl radical with cluster models of a hydroxylated α-quartz surface was studied by means of density functional calculations. Two molecular models representing isolated (⋮Si OH) and geminal ( Si(OH) 2 ) silanol-terminated quartz surfaces were used. Two reactive sites of the silanol models were…
The shear dependent location of the isotropic-nematic spinodals in suspensions of bacteriophage fd is studied by means of time resolved birefringence experiments. The hysteresis in the birefringence on increasing and subsequently decreasing the shear-rate allows the determination of the location of points in the shear…
The valence band and $\mathrm{C}1s$ photoemission spectra were measured from the tips and the sidewalls of multiwalled carbon nantoubes grown on Si substrates. The results show an overall spectral shift to the higher-binding-energy side, a larger density of states at the Fermi level, and a lower work function at the t…
RuO 2 (110) surfaces were prepared by exposing Ru(0001) to 107 L of O2 at 700 K. Postexposure of O2 at 300 K resulted in an additional oxygen species (O-cus) adsorbed on coordinatively unsaturated Ru atoms (Ru-cus). The surface was then exposed to CO at 300 K and studied by thermal desorption spectroscopy (TDS) and hi…
First hyperpolarizabilities β were obtained for CX4 molecules in gas and liquid phases from hyper-Rayleigh scattering measurements at λ=1064 nm. The gas-phase results for βxyz (atomic units) are 7.1±0.9 (CH4), 7.0±0.9 (CD4), 5.4±0.6 (CF4), and 11.0±0.9 (CCl4). Ab initio calculations of β are consistent with the experi…
To determine the factors affecting the ground-state electron configuration of low-spin Fe(III) porphyrin complexes, we have examined the (1)H NMR, (13)C NMR, and EPR spectra of a series of low-spin bis-ligated Fe(III) porphyrin complexes [Fe(Por)L(2)](+/-), in which the positions of porphyrin substituents and the coor…
Abstract Blend films were prepared from hydrophobic poly( L ‐lactide) (PLLA) and hydrophilic poly(vinyl alcohol) (PVA) with different PLLA contents [ X PLLA (w/w) = PLLA/(PVA + PLLA)] by solution casting and melt quenching. Their morphology, swelling behavior, and surface and bulk properties were investigated. Polariz…
Cobalt(III) porphycenes, structural isomers of cobalt(III) porphyrins, catalyze the addition of alcohols to vinyl ethers in a toluene−dioxane solution containing alcohol and Et 3 N as well as the autoxidation of the resultant metal-bound adduct; this produces two acetals, namely, those of β-formylacetaldehyde and β-hy…
Abstract Schottky barriers of the type Au/polypyrrole/Al (or In) were made in sandwich configuration. The conductivity of polypyrrole was tuned to be on the order of 10 −3 ohm −1 cm −1 by its electrodeposition from a novel ambient temperature ternary eutectic melt consisting of acetamide, urea, and ammonium nitrate. T…
By means of scanning cathodoluminescence (CL) measurements, high-resolution transmission electron microscopy (HRTEM), and electron energy loss spectroscopy (EELS), we have studied the origin of the band-$A$ emission in homoepitaxial diamond thin films grown using microwave-plasma chemical vapor deposition (CVD). A bro…
The theoretical basis for the phenomenon of quantum sieving is detailed for confined one-dimensional systems. A simple theory is presented to calculate zero-pressure selectivities due to quantum sieving in nanopores. This simple theory is used to evaluate the ability of various carbon nanotubes and interstices of nano…
The magnetic susceptibility \ensuremath{\chi}, heat capacity, and electrical resistivity \ensuremath{\rho} under pressure have been measured on ${\mathrm{La}}_{3}{\mathrm{Ni}}_{2}{\mathrm{O}}_{7}$ and ${\mathrm{La}}_{4}{\mathrm{Ni}}_{3}{\mathrm{O}}_{10}.$ Heat-capacity measurements reveal electronic heat-capacity coef…
In this paper we have investigated the effects of sintering time and temperature on the formation and critical current densities of Fe-clad MgB2 wires. MgB2 wires were fabricated using the powder-in-tube process and sintered for different periods of time at predetermined temperatures. All the samples were examined usi…
In a series of recent papers van Gastel et al have presented first experimental evidence that impure, Indium atoms, embedded into the first layer of a Cu(001) surface, are not localized within the close-packed surface layers but make concerted, long excursions visualized in a series of STM images. Such excursions occu…
We studied the correlation between magnetic, electrical, structural, and magnetostriction properties of the electron doped manganites Ca$_x$Sm$_{1-x}$MnO$_3$ (x = 0.85, 0.8). The paramagnetic to antiferromagnetic transition in both the compounds while cooling is accompanied by an abrupt increase of the spontaneous vol…