Materials Literature
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Abstract Polycarboxylic acids have been used as nonformaldehyde durable press finishing agents for cotton fabrics. Previously, we found that itaconic acid (IA) polymerized in situ on cotton fabric and also in an aqueous solution in the presence of a K 2 S 2 O 8 /NaH 2 PO 2 initiation system. Both poly(itaconic acid) (…
Three new germanate solids, ASU-19, ASU-20-DAPe, and ASU-20-DACH, have been synthesized under hydrothermal conditions using respectively 1,4-diaminobutane (DAB), 1,5-diaminopentane (DAPe), and 1,4-diaminocyclohexane (DACH) as bases. The structures of ASU-19 and ASU-20-DACH have been characterized by single-crystal X-r…
High quality semiconducting famatinite (Cu3SbS4) nanofibers and tetradrite (Cu12Sb4S13) nanoflakes have been selectively synthesized through mild hydrothermal and solvothermal synthesis routes, respectively. The morphology and phase of the products can be successfully controlled by choosing appropriate reaction media…
Amorphous poly(l-lactide) (PLLA) was annealed in two different ways: amorphous samples were heated at a given temperature to induce crystallization (one-step annealing); and amorphous samples were first crystallized at a low temperature and subsequently annealed at a higher temperature than the crystallization tempera…
In revisiting the original argument of de Gennes and Hervet [J. Phys. (Paris) 44, L351 (1983)]] leading to "hollow-core" dendrimers, we show that a self-consistent application of their model leads to the "filled-core" model first elucidated by Lescanec and Muthukumar [Macromolecules 23, 2280 (1990)]]. The monomer dens…
A simple thermodynamic model for determining the wetting free energy of a small, sessile drop spreading on a solid surface has been derived by assuming that the process can be treated as adsorption. According to the model, free energies are expected to be small for large contact angles and increase exponentially as co…
Mono-urea serine derivatives with low molecular weights were prepared in one step and show remarkable self-assembling and gelation properties in water.
High-speed melt spinning of racemate polylactide (r-PLA), which is a blend of equal amounts of poly(l-lactide) and poly(d-lactide) molecules, was performed up to the take-up velocity of 7.5 km/min. In the fiber structure analysis, particular attention was paid to the formation of stereocomplex crystals, because this c…
A variety of semicrystalline isotactic polypropylene composites containing carbon nanotubes and nanofibers were produced by melt and solution techniques. The effect of the nanofillers on the crystallization process was investigated by transmission electron microscopy, scanning electron microscopy, and differential sca…
The effect of some metal ions (Fe2+, Ni2+, Zn2+, Pb2+) upon the fluorescent intensity of a first generation polyamidoamine dendrimer with a peripheral 4-dimethylaminoethylamine-1,8-naphthalimide group was investigated. The presence of metal ions was found to evoke a photoinduced electron transfer leading to an enhance…
This review article deals with the recent work published on the catalytic activity of transition metal oxides of group IV of the periodic table. These oxides are mainly in the form of MO2, where M refers to either titanium, zirconium, or hafnium. The preparation of the pure, mixed, and supported oxides, as well as the…
Layer-by-layer sequential adsorption technique (LBL) can be utilized as a deposition method for nanostructured coatings on highly curved micrometer to millimeter scale surfaces, which is demonstrated in this work on a model films of strongly luminescent CdTe nanoparticles. Unlike LBL on colloids and flat surfaces, suc…
(Y 0.95 Eu 0.05 ) 2 O 3 nanoparticles have been synthesized by subambient homogeneous reduction using alkalide solutions and subsequent oxidation. As synthesized, the material consists of free-flowing agglomerates of ill-defined, amorphous, or subnanocrystalline nanoparticles. Samples annealed at 500 °C or greater are…
New hybrid polyoxazolines (CubePOZO) were synthesized by ring-opening polymerization of 2-methyl-2-oxazoline initiated by functionalized polyhedral oligomeric silsesquioxane (POSS) with various feed ratios. The hybrid micelles derived from CubePOZO with both seven hydrophobic cyclopentyl groups of POSS and polyoxazoli…
A low-temperature, nonaqueous synthesis approach is described that produces a series of gallium sulfide and polysulfide three-dimensional superlattices from binary Ga-S and ternary Zn-Ga-S supertetrahedral clusters. The diversity of superlattices is achieved by modifying the cluster size, the cluster composition, and…
We report the magnetotransport characteristics of a trilayer ferromagnetic tunnel junction built of an electron doped manganite (${\mathrm{L}\mathrm{a}}_{0.7}{\mathrm{C}\mathrm{e}}_{0.3}{\mathrm{M}\mathrm{n}\mathrm{O}}_{3}$) and a hole doped manganite (${\mathrm{L}\mathrm{a}}_{0.7}{\mathrm{C}\mathrm{a}}_{0.3}{\mathrm{…
A spatially ordered quantum dot array of cationic indium nanoclusters has been synthesized in a single crystal of zeolite X. A single crystal of fully dehydrated and fully indium-exchanged zeolite X (ca. In 87 Si 100 Al 92 O 384, In 87 −X) was exposed to 0.5 atm of H 2 S for 12 h at 673 K. After it was evacuated at te…
Transmission gratings were formed holographically in polymer dispersed liquid crystal (HPDLC) composite materials using commercially available UV-curable acrylate monomers and the nematic liquid crystal TL203. Monomer mixtures with average functionality ranging from 1.3 to 3.5 were used to prepare HPDLC transmission g…
We report an enhancement of the electron spin relaxation time (T1) in a (110) InAs/GaSb superlattice by more than an order of magnitude (25 times) relative to the corresponding (001) structure. The spin dynamics were measured using polarization sensitive pump probe techniques and a mid-infrared, subpicosecond PPLN OPO…
We report on the generation of coherent phonon polaritons in ZnTe, GaP and LiTaO$_{3}$ using ultrafast optical pulses. These polaritons are coupled modes consisting of mostly far-infrared radiation and a small phonon component, which are excited through nonlinear optical processes involving the Raman and the second-or…