Materials Literature
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Deposition of molecular contamination onto spacecraft surfaces changes the thermo-optical and electrical properties of those surfaces. Such changes may induce changes in the properties and performance of other spacecraft systems. Interactions with space environments may continue to change the nature of contaminant spe…
The effect of saturation of polydienes with varying microstructures on the phase behavior of poly(vinylcyclohexane) (PVCH)/poly(ethylene- co -1-butene) (PEB) and PVCH/poly(ethylene- alt -propylene) (PEP) blends was investigated. For the study, a series of polyisoprenes (PI) and polybutadienes (PB) with varying microst…
PZT(Zr:Ti=52:48) ceramics can be modified by Gd 3+ , giving compositions Pb 1-x Gd x - ( Zr 0.52 Ti 0.48 )1-x/4 O 3 with x = 0.00, 0.01, 0.5, 1, 2, 6 and 10 mole percent. X-ray diffraction patterns show that all PGZT samples are of tetragonal structure and the highest doping should be no more than 2 mole percent Gd at…
A two‐fluid, computational fluid dynamics study of the phenomena of bubble collapse under a submersed flat plate has been performed. In order to handle the rapidly changing bubble‐water interface accurately, second order upwind differencing is used in calculating the advection term. Good agreement with experimental da…
We present exact numerical results indicating that ionization could be a useful tool to study electron correlations in artificial molecules and nanoarrays of metallic quantum dots. For nanorings consisting of Ag quantum dots of the type already fabricated, we demonstrate that the molecular orbital picture breaks down…
Since natural blood vessels are lined with an endothelial cell (EC) monolayer, it is proposed that synthetic biomaterial surfaces be covered or seeded with endothelial cells for ideal nonthrombogenicity under normal conditions. The effects of the surface energy of hydrophilic-hydrophobic IPN on EC adhesion and growth…
We report a new method to control both the nucleation and growth of polypyrrole (Ppy) for the formation of the patterns from micrometer to nanometer sizes using adsorbed sodium dodecyl sulfate bilayers as a molecular mask. Polystyrene (PS) and poly(4-vinylpyridine) blend and block poly(styrene- b -4-vinylpyridine), wh…
The two main goals of the current work are: (i) to test the effects of Proton Sponge as a H + scavenger and (ii) to test and rank the relative efficacy of the anions (Y - ) listed below for their relative ability to allow the formation, stabilization (including isolability), high catalytic activity, and long catalytic…
Nanometre-size cobalt columns with tilt angle ranging from ∼0 º to ∼40 º and fixed density on Si(100) were fabricated by combining oblique-angle physical evaporation with controlled substrate motion. The column tilt angle can be controlled by the speed and phase of substrate rotation in addition to the angle of the in…
Crystals of Cs 2 NaYCl 6 singly doped with Mo 3+ or V 3+ and a series of V 3+:Mo 3+ codoped Cs 2 NaYCl 6 crystals were studied by low-temperature optical absorption and luminescence spectroscopy with particular focus on their near-infrared (NIR) to visible (vis) photon upconversion properties. In the codoped crystals…
The spectral and geometric trends of Ln(trensal) complexes (H(3)trensal = 2,2',2' '-tris(salicylideneimino)triethylamine) along the lanthanide series are analyzed. Low-temperature polarized absorption and luminescence spectra are reported for nine of the complexes with transitions suitable for analysis. Both the angul…
The synthetic route to a new fully conjugated phenanthroline appended phthalocyanine is described. This compound has been fully characterised by elemental analysis, UV-VIS, IR, MS and 1H NMR spectroscopy.
We predict that freely suspended, linear molecular conductors or dielectrics, such as carbon nanotubes, can support electronic states that are localized far from the surface. These "tubular image states" are formed in extended potential wells resulting from the tug of war between the external electron's attraction to…
A copper(II) Schiff base complex bearing hydroxyl groups [bis(4-hydroxysalicylaldehyde)ethylenediaminate] copper(II), [Cu(4-HOsalen)], was directly anchored onto an air-oxidized activated carbon. Oxidation of the activated carbon was done with a mixture of air and N 2 (with 5% O 2 ) to increase the oxygenated surface…
We use the spectral moments method in the framework of the bond-polarization theory to calculate polarized nonresonant Raman spectra of chiral and achiral single-wall carbon nanotubes as a function of their diameter and length. In a previous approach, an investigation of finite-size effects was limited to a narrow len…
Wool is a complex material, composed of cuticle and epicuticle cells, surrounded by a cell membrane complex. Wool fibers absorb moisture from air, and, once immersed in water, they take up considerable amounts of liquid. The water absorbency parameter can be determined from weight gain, according to a standard method,…
This brief review critically assesses achievements, current trends, limitations, and prospects for crystal engineering with an emphasis on the growth opportunities for this field.
A new approach to the preparation of epoxy−clay nanocomposites is reported based on the intercalation and exfoliation of homostructured mixed inorganic/organic cation exchanged forms of a commercially available montmorillonite (PGW) and a synthetic fluorohectorite (FH) clay. In these mixed-ion homostructures both the…
In this study, two series of the polyimide−silica hybrid optical thin films, PMDA−ODA/SiO 2 and 6FDA−ODA/SiO 2, were synthesized using an in situ sol−gel reaction combined with spin coating and multistep curing. The hybrid thin films were prepared by the aminoalkoxysilane-capped poly(amic acid)s and tetramethoxysilane…
We show that the electronic and atomic structure of carbon nanotubes undergo dramatic changes with hydrogen chemisorption from first principle calculations. Upon uniform exohydrogenation at half coverage, the cross sections of zigzag nanotubes become literally square or rectangular, and they are metallic with very hig…