Materials Literature
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Laser-induced fluorescence and dispersed fluorescence spectra measured in supersonic jets for 9,10,19,20-tetra-n-methylporphycene and 9,10,19,20-tetra-n-propylporphycene reveal, for both compounds, the presence of two different species which are assigned to trans and cis tautomeric forms. Doublet splitting of lines is…
The synthesis and characterization of a new family of ionic liquid crystal dendrimers consisting of the ammonium salts of the commercially available poly(propylene imine) ( G = 1−5) dendrimers and 4-decyloxy-, 3,4-didecyloxy-, and 3,4,5-tridecyloxybenzoic acids are reported. The liquid crystalline behavior was investi…
A new thermally stable second-order nonlinear optical (NLO) inorganic-organic hybrid film was successfully prepared by using a sol-gel process of alkoxysilane dye containing a benzothiazole unit. The dye-bonded precursor was synthesized from 3-isocyanatopropyltriethoxysilane and the heterocycle azo dye 2-[4'-(N-ethyl-…
We have evaluated the thermal stability of BaAl 2 Si 2 O 8:Eu 2+ (BAS:Eu 2+ ) phosphor using its polymorph property and hexagonal and monoclinic crystal structure, depending upon firing temperature for plasma display panel application. When BAS:Eu 2+ samples having each characteristic crystal structure were baked at 5…
Interesting multilayered nanostructures of molecular-scale alternating titania nanosheet and silver metal have been successfully fabricated by combined use of a layer-by-layer route and an in situ room-temperature ultraviolet irradiation technique with a titania nanosheet and a polyethylenimine−Ag + (PEI−Ag + ) comple…
Octylamine capped ZnO nanoparticles with mean diameters in the range of 4-14 nm were obtained by thermolysis of single source metal-organic precursors. The nanocrystals were characterized by X-ray diffraction, transmission electron microscopy, and UV-visible, luminescence, and excitation spectroscopies. The nanocrysta…
Helical mesoporous silica, methylene−silica, ethane−silica, ethene−silica, octane−silica, and phenylene−silica nanofibers were successfully prepared by sol−gel polymerization using a chiral cationic gelator under a shear flow. These helical nanofibers were constructed by bundles of ultrafine nanofibers that were forme…
Pyrophyllite, Al2[Si4O10](OH)2, is the simplest structural prototype for 2:1 dioctahedral phyllosilicates. Since it does not possess permanent structural charge as other clay minerals do, it is used to investigate sorption properties of the clay surfaces not related to the permanent structural charge. The bulk structu…
A series of nitronyl nitroxide (NN) diradicals with linear conjugated couplers and another series with aromatic couplers have been investigated by the broken-symmetry (BS) DFT approach. The overlap integral between the magnetically active orbitals in the BS state has been explicitly computed and used for the evaluatio…
We demonstrate a technique that enables ferromagnetic resonance (FMR) measurements of the normal modes for magnetic excitations in individual nanoscale ferromagnets, smaller in volume by a factor of 1000 than can be probed by other methods. The measured peak shapes indicate two regimes of response: simple FMR and phas…
We show that the accumulation of spin-polarized electrons at a forward-biased Schottky tunnel barrier between Fe and n-GaAs can be detected electrically. The spin accumulation leads to an additional voltage drop across the barrier that is suppressed by a small transverse magnetic field, which depolarizes the spins in…
Optically-detected magnetic resonance (ODMR) and positron annihilation spectroscopy (PAS) experiments have been employed to study magnesium-doped GaN layers grown by metal-organic vapor phase epitaxy. As the Mg doping level is changed, the combined experiments reveal a strong correlation between the vacancy concentrat…
A systematic, decoration-based technique to discover the atomic structure of a decagonal quasicrystal, given pair potentials and experimentally measured lattice constants, is applied to the ``basic'' cobalt-rich decagonal Al-Co-Ni quasicrystal. First lattice-gas Monte Carlo simulations are performed, assuming the atom…
Layered core-shell bimetallic silver-gold nanoparticles were prepared by coating Au layers over Ag seeds by a seed-growth method. The composition of Ag100-xAux particles can vary from x=0 to 30. TEM and SEM images clearly show that the bimetallic nanoparticles are of core-shell structure with some pinholes on the surf…
Deformation twinning is confirmed upon large plastic deformation in nanocrystalline (nc) Ni by transmission electron microscopy examinations. New and compelling evidence has been obtained for several twinning mechanisms that operate in nc grains, with the grain boundary emission of partial dislocations determined as t…
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Abstract This study develops a modified free‐volume model to predict solvent diffusion coefficients in amorphous polymers by combining the Vrentas–Duda model with the Simha–Somcynsky (S‐S) equation‐of‐state (EOS), and all the original parameters can be used in the modified model. The free volume of the polymer is esti…
We report here on a method of suspending carbon nanotubes (CNTs) in aqueous buffer solutions and functionalizing CNTs with a molecule that is “sticky” to proteins. The specific bifunctional molecule used in this study is 1-pyrene butanoic acid succidymidyl ester (1-pbase). We report successful protein and quantum dot…
Abstract Poly(ethylene terephthalate) (PET) has been subjected to high energy ball milling at two different temperatures (cryogenic temperature and ambient temperature). The morphological and crystal structural evolutions of milled powders are characterized by means of scanning electron microscopy (SEM), transmission…
It has previously been noted that the implantation of argon atoms into amorphous SiBCN materials (prepared by magnetron sputtering in various N 2 +Ar mixtures) leads to variations in a number of material properties; for example an increase in compressive stress. Little is known about the mechanism by which Ar incorpor…