Materials Literature
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Free radicals generated by decomposition of benzoyl peroxide in the presence of alkyl iodides have been used to derivatize small-diameter single-wall carbon nanotubes (HiPco tubes). The degree of functionalization, estimated by thermal gravimetric analysis, is as high as 1 in approximately 5 carbons in the nanotube fr…
This work presents the first systematic study of the surface-enhanced Raman-scattering (SERS) properties of nanosphere lithography (NSL) derived Ag nanoparticles. Furthermore, it demonstrates the necessity of correlating nanoparticle structure and localized surface plasmon resonance (LSPR) spectroscopic data in order…
Abstract Nonlinear optical (NLO) rigid main‐chain polyesters containing azobenzene mesogens with high thermal and temporal stabilities were synthesized from derivatives of hydroxyphenylazobenzoic acid. The NLO properties of the homopolymer, poly[4‐(4‐hydroxy‐3‐methyl phenyl)azo]benzoic acid, and copolymers of 4‐[(4‐hy…
We report on the influence of semicrystalline morphology on the physical aging characteristics of poly(phenylene sulfide) or PPS. Specifically, the semicrystalline morphology of PPS was described in terms of a three-phase system comprising a crystalline phase, a mobile-amorphous phase, and a rigid-amorphous phase. The…
We study the self-assembly in thin films of a lamella-forming polystyrene- block -poly(2-vinylpyridine)- block -poly( tert -butyl methacrylate) triblock terpolymer thin film on a polyimide substrate and compare it with the self-assembly of the same system on a native oxide silicon (SiO x ) substrate. In addition to sc…
Nuclear ribosomal small subunit and chloroplast rbc L sequence data for heterokont algae and potential outgroup taxa were analyzed separately and together using maximum parsimony. A series of taxon sampling and character weighting experiments was performed. Traditional classes (e.g. diatoms, Phaeophyceae, etc.) were m…
We study a version of the one-dimensional spin-orbital model with spins $S=1$ relevant to cubic vanadates. At small Hund's coupling ${J}_{H}$ we discover dimerization in a pure electronic system solely due to a dynamical spin-orbital coupling. Above a critical value ${J}_{H},$ a uniform ferromagnetic state is stabiliz…
Embedded carbon nanotubes delay polymer film cracking via tube stretching and pulling out. Tube breaking is not observed in our experiments, which contradicts a previous report.
A mixed-valence organic−inorganic hybrid compound, (H 3 DETA)[Fe 3 (C 2 O 4 ) 2 (HPO 4 ) 2 (PO 4 )] (DETA = diethylenetriamine), has been synthesized under hydrothermal conditions and characterized by single-crystal X-ray diffraction, magnetic susceptibility, 57 Fe powder absorption Mössbauer spectroscopy, and electri…
Two new ligands 4,6-bis(4′-pyridylsulfide)dibenzofuran L1 and 4,6-bis(methylsulfanylmethyl)dibenzofuran L2, based on dibenzofuran with exodentate thio-pyridine arms were prepared. The crystal structures of three metallomacrocycles were determined. Reaction of L1 with AgClO4 in a 1 : 1 metal-to-ligand ratio gave a ClO4…
The 1.4-A crystal structure of the oxidized state of a Y25S variant of cytochrome cd(1) nitrite reductase from Paracoccus pantotrophus is described. It shows that loss of Tyr(25), a ligand via its hydroxy group to the iron of the d(1) heme in the oxidized (as prepared) wild-type enzyme, does not result in a switch at…
Aluminium nitride (AlN) nanopowder was successfully synthesized from transition alumina nanopowder via a new single-step nitridation process. A gas mixture of NH 3 –C 3 H 8 was employed as a reduction–nitridation agent, which enables direct nitridation of transition alumina at processing temperatures of 1200–1400 ° C.…
Germanium nanoclusters of average diameter 4 nm were prepared with covalently bound termination groups. Chloride-terminated nanoclusters were reacted with a Grignard reagent to form acetal-containing surface-terminated nanoclusters. Treatment with acid yielded hydroxyl-containing surface-terminated nanoclusters, and t…
Numerous approaches have been described for modifying biomaterials to incorporate extracellular matrix components. "Peptide-amphiphiles", whereby monoalkyl hydrocarbon chains are covalently linked to peptide sequences, have been shown previously to (a) form specific molecular architecture with enhanced stability and (…
Polyfluorinated surfactant (C n F 2 n +1 CONH(CH 2 ) 2 N + (CH 3 ) 2 C 16 H 33 Br -; designated as C n F-S, where n = 1−3)/clay hybrid compounds have been shown to provide polyfluorinated microcavities in the clay interlayers with molecular dimensions. The aggregation behavior of a water-soluble porphyrin (tetra(4-sul…
The crystal chemistry of a new structure type found in the Pb−M−B−O system, PbMBO 4 (M = Al, Ga), was extended to include M = Cr, Mn, and Fe. Extension to other trivalent ions, such as Ti, V, Co, Sc, In, and Y, failed for various reasons. Single crystals were grown from a PbO flux for M = Mn and Fe and the crystal str…
A facile sol–gel coating procedure has been successfully applied for the ZrO2 coating of eggshell membranes (ESM), resulting in hierarchically ordered thin films with a macroporous network structure comprising crystalline ZrO2 tubes. This hierarchical material, which was obtained through sol–gel mineralization of the…
Nanocrystalline HgE (E = S, Se, Te) particles are an important class of materials that may have applications in the opto-electronics industry, notably as potential replacements for rare-earth dopants in optical fibers or in opto-electronic modulators. Organometallic routes to nanoparticles can produce materials of a s…
A simple and rapid process has been developed for the preparation of nanometer-sized ZnO crystals via ultrasonic irradiation, by which pure ZnO nanocrystals with an average size of 6 nm and narrow size distribution can be synthesized in a short time and without using any solvents for the precipitation of ZnO.
Powder neutron diffraction data at high resolution (HRPD instrument, ISIS Facility, U.K.) were collected on the lithium ion conductor α-LiZr 2 (PO 4 ) 3 at 673 K ( a = 8.84448(3) Å, c = 22.2875(1) Å), and 873 K ( a = 8.83667(4) Å, c = 22.4177(2) Å). Previous data measured at 423 K were included in the analysis. By Fou…