Materials Literature
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The antineoplastic agent paclitaxel (PTX), a microtubule-stabilizing agent, is known to arrest cell cycle progression and induce apoptosis. Mild hyperthermia (HT) also disrupts the microtubule system and triggers apoptosis. We therefore investigated whether concurrent exposure of murine breast cancer cells to 10 micro…
An immiscible polymer-clay nanocomposite has been synthesized consisting of dispersed layers of organically modified montmorillonite (OMOM) in a polybenzoxazine matrix as shown by thermogravimetry, wide angle x-ray diffraction (WAXD), and transmission electron microscopy. Five small protonated amines showed high ion-e…
The structure of pure TeO2 and alkali tellurite glasses has been examined by neutron diffraction and ab initio molecular orbital methods. The experimental radial distribution functions along with the calculated results have demonstrated that the basic structural units in tellurite glasses change from highly strained T…
This paper presents an experimental technique to measure the directional thermal conductivity and thermal diffusivity of materials. A heated thermistor heats the sample and a sensing thermistor placed about 2.5 mm away measures the temperature rise due the heating pulse at the heated thermistor. An empirical relation…
A method for synthesizing polyoxymethylene (POM) film at high deposition rates was achieved via hot filament chemical vapor deposition (HFCVD). Nuclear magnetic resonance spectra show that the structure of the polymer is linear, rather than cross-linked (which plasma enhanced CVD would have produced). The linear struc…
All articles of this category Our studies on synthesis of directly meso-meso -linked and fused porphyrin arrays were reviewed. Ag I -promoted meso-meso coupling reaction of 5,15-diaryl Zn II -porphyrins is advantageous in light of its high regioselectivity as well as its easy extension to large porphyrin arrays. Doubl…
The effect of galvanized corrosion steel sheets and zinc-rich primer coated steel sheets on the perforation corrosion of actual automobiles and the relevant corrosion mechanism was studied. Perforation occurred in 6-7 years for zinc-rich primer coated steel panels inside of door hems and after more than 14 years for g…
A series of iron porphyrins bearing one to eight beta-nitro substituents were synthesized and evalauted as catalysts for hydrocarbon oxidation with H2O2; iron porphyrins bearing five or six beta-nitro groups were the best catalysts for cyclooctene epoxidation and adamantane or anisole hydroxylation without need of a c…
Extrusion-blended and injection-molded PEI/PBT blends were found to be miscible whatever the composition. The processability of the blends clearly improved with the presence of PBT. The melt pressure at the exit was seen to be a parameter as representative of the processability of the blends as the torque of blending.…
In contrast to earlier methods requiring the presence of organic modifiers for the preparation of cubic MCM-48 mesostructures from low cost sodium silicate, we show that this three dimensional framework structure can be readily assembled in the absence of co-surfactants simply by using the overall SiO2/OH- ratio as me…
Hyperbranched polyglycerols exceeding Mn > 15,000 g/mol (DPn > 270) have been prepared, using a modified version of the synthetic protocol reported earlier. In the optimized process polydispersities recorded by SEC remained narrow, with Mw/Mn < 1.7 over a large molecular weight range. The drastic increase of viscositi…
This paper describes the correlation between the ability to control nematic liquid crystal (LC) alignment and wetting properties of mixed monolayers formed by coadsorption of two O-octacarboxymethylated calix[4]resorcinarenes (CRA-CMs) with either perfluorooctyl- or octylazobenzene units. Photoirradiation of CRA-CM mo…
An over-oxidized poly(N-acetylaniline) (PNAANI)/GCE was used to determine dopamine (DA) in a large excess of ascorbic acid (AA) by differential pulse voltammetry. A linear relation between Ip and DA concentration was found over the range 5.0 x 10(-7) to 2.0 x 10(-5) M. The detection limit was 1.68 x 10(-8) M for S/N =…
Spontaneous core–shell and shell–shell reactivities of thiolate-capped nanoparticles are exploited for assembling nanoparticle network thin films via an exchange–crosslinking–precipitation route. Gold nanoparticles of two different core sizes (2 and 5 nm) capped with decanethiolates and alkylthiols of two different fu…
Freshly prepared porous silicon (PSi) surfaces have been modified with different organic molecules such as alkenes (1-decene, ethyl undecylenate) and nonconjugated dienes (1,7-octadiene) in a thermal process to yield organic monolayers covalently attached to the surface through Si-C bonds. These monolayers have been c…
Mixed oxide samples of Sn1 − xTixO2 (0.0 ≤ x ≤ 1.0), prepared by the co-precipitation method followed by heating at variable temperatures, have been investigated by powder X-ray diffraction and 119Sn MAS NMR spectroscopy. Based on powder X-ray diffraction studies, the formation of solid solutions has been observed for…
Aqueous polymerization of 3-chloroaniline (mCA) was studied using sodium dichromate as oxidant in the presence of hydrochloric acid. The effect of hydrochloric acid, sodium dichromate and monomer concentration on the polymerization rate, specific viscosity of the obtained polymer and ac conductivity was investigated.…
Polycrystal pellets and single-crystal fibers of doped with were prepared. Spectroscopic studies reveal that the ions occupied three nonequivalent sites, with two at sites and one at sites. Their emission lines for to transition are located at 578.1, 580.0, and 581.0 nm, respectively. Dominant emission originates from…
The reaction of (NBun4)[Mn8O6Cl6(O 2CPh)7(H2O)2] with 2-(hydroxymethyl)pyridine (hmpH) or 2-(hydroxyethyl)pyridine (hepH) gives the MnII2MnIII10 complexes [Mn12O8- Cl4(O2CPh)8(hxp)6] [hxp− = hmp− (1) or hep− (2)]; these compounds are core isomers with markedly different magnetic properties, compound 1 having an S = 7…
[RuCl2(NO)(terpy)]PF6 ([1]PF6) has been synthesized by the reaction of K2[RuCl5(NO)] with terpy and characterized by single-crystal X-ray crystallography. [1]PF6 has a structure in which the two chloro ligands are located trans to each other with the nitrosyl ligand on the plane of the terpy ligand. Reactions of [1]PF…