Materials Literature
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Currently available IR transparent materials typically exhibit a trade-off between optical performance and mechanical strength. For instance, sapphire domes are very strong, but lack full transparency throughout the 3-5 micron mid-wave IR band. Yttria is fully transparent from 3-5 microns, but lacks sufficient strengt…
When the emulsion inversion from an abnormal oil-in-water (O/W) system to a normal water-in-oil (W/O) morphology is produced by continuous stirring, the fraction of dispersed phase at which the inversion is triggered (which is known as the critical dispersed phase fraction) and the inversion mechanism are affected by…
Abstract Polylactide (PLA) fibers were dyed with Disperse Blue 79 in supercritical carbon dioxide (SC‐CO 2 ). The effects of dyeing conditions such as the temperature, pressure, and time on the dyeing and mechanical properties were discussed in comparison with those in water. A major advantage of dyeing PLA in SC‐CO 2…
Abstract In this work, integration on the same chip of porous silicon gas sensors along with their driving/readout electronic circuits by using an industrial microelectronic process is demonstrated. To ensure maximum compatibility, the porous silicon formation is performed after the integrated circuit fabrication flow…
We report electrochemical studies, spectroscopy, and electrogenerated chemiluminescence (ECL) of four monodisperse star-shaped truxene core-oligofluorene compounds (T1-T4). All oligomers produced stable radical anions and radical cations and showed blue ECL by ion annihilation with an intensity that could be seen with…
We demonstrate control of ZnO nanorod density for self-organized growth on ZnO buffer layers on Si by varying Zn supersaturation during the initial growth phase, thereby altering the competition between 2D and 1D growth modes. Higher initial supersaturation favours nanorods of diameter <200 nm with micron-sized bas…
Abstract The polypeptide sequence MS14 (MHGKTQATSGTIQS) was used to explore a new method for biomimetic preparation of gold nanoparticles and their aggregates. Self‐congregation of gold nanoparticles into aggregates in MS14 aqueous solution and self‐assembly of gold crystallites onto the designed complex of MS14‐PET f…
The multifunctional acyl-acyl carrier protein (ACP) desaturase from Hedera helix (English ivy) catalyzes the Delta(4) desaturation of 16:0-ACP and the Delta(9) desaturation of 18:0-ACP and further desaturates Delta(9)-16:1 or Delta(9)-18:1 to the corresponding Delta(4,9) dienes. The crystal structure of the enzyme has…
With X-ray and neutron reflectivity, the structure and composition of polyelectrolyte multilayers from poly(allyl amine) (PAH) and poly(styrene sulfonate) (PSS) are studied as function of preparation conditions (salt concentration and solution temperature, T). The onset of a temperature effect occurs at 0.05 M NaCl (D…
Two new polynuclear azido-bridged Co(II) compounds with formulas catena-[Co(mu1,3-N3)(N3)(py)2(H2O)]n (1) and [Co(mu1,3-N3)2(4-acpy)2]n (2) (py=pyridine, 4-acpy=4-acetylpyridine) have been structurally and magnetically characterized. Compound 1 crystallizes in the orthorhombic system Fddd space group and consists of a…
Abstract The FTIR spectroscopic technique was used in the study of ternary polymer–metal complexes containing two polyelectrolytes of opposite charge and metal ions. The structure of the ternary (PAA‐Fe 3+ ‐PVP) complexes was examined by following the changes in their infrared spectra. It was found that the shapes of…
The films coating urban impervious surfaces have been found to be comprised of about 7% inorganic nitrate and approximately 10% organic compounds (by mass). A simple steady-state analysis of the lifetime of the nitrate in the film suggests the existence of a loss process(es) in addition to washout by rainfall. We show…
Highly luminescent zinc(II)-bis(8-hydroxyquinoline) (Znq(2)) complex nanorods have been synthesized via a sonochemical route from the microemulsion containing zinc acetate and 8-hydroxyquinoline. The scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images showed that the products were rod-…
A computational study using the B3LYP/6-31G(d) level of theory shows that the chemisorptions of one and two hydrogen atoms on the external surface of (3,3), (4,4), (5,5), and (6,6) armchair single-walled carbon nanotubes (SWNTs) are exothermic processes. Our results clearly indicate that two hydrogen atoms favor bindi…
Transparent glass-ceramics containing β-Ga 2 O 3:Ni 2+ nanocrystals were synthesized and characterized by X-ray diffraction, transmission electron microscopy, and electron energy loss spectroscopy. Intense broad-band luminescence centering at 1200 nm was observed when the sample was excited by a diode laser at 980 nm.…
In this work, the lateral mobility of polyelectrolyte multilayers was investigated by means of the fluorescence recovery after photobleaching (FRAP) technique, with special attention to the effect of relevant parameters during and after preparation. Different polyelectrolytes with respect to charge density, stiffness,…
Abstract Two types of mixtures were prepared by solution blending: high molecular weight polyhydroxybutyrate (PHB)/poly( ε ‐caprolactone) (PCL) and PHB/low molecular weight chemically modified PCLs (mPCL). The morphology, crystallization, and enzymatic degradation of the blends were studied by differential scanning ca…
Equilibrium molecular dynamics simulations on amorphous polymers filled with solid nanoparticles show that mechanical reinforcement results from the formation of a long-lived transient polymer−particle network only over a narrow range of parameter space. In these cases it is necessary that (i) the interfacial zone occ…
Abstract Zein fibers have been produced by electrospinning from acetic acid, aqueous methanol, ethanol and isopropyl alcohol. Alcohol solutions produced fibers that were predominantly ribbons. Fibers spun from acetic acid solution have a round morphology with a narrower distribution of diameters when spun under suitab…
Colloidal zinc oxide (ZnO) quantum dots (QDs) with a uniform particle size of around 5 nm have been synthesized, purified and blended with polymethylmethacrylate (PMMA) by solution mixing to prepare PMMA/ZnO nanocomposite films. The structure and morphology of ZnO QDs and PMMA/ZnO nanocomposite films have been charact…