Materials Literature
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The purposes of this project were to prepare amorphous carbamazepine by dehydration of crystalline carbamazepine dihydrate, and to study the kinetics of crystallization of the prepared amorphous phase. Amorphous carbamazepine was formed and characterized in situ in the sample chamber of a differential scanning calorim…
New N-methylimidazole-functionalized gold clusters 2 catalyze, in 6∶4 methanol–water solution, the cleavage of 2,4-dinitrophenyl acetate with more than an order of magnitude rate acceleration with respect to acetyl-N-methylhistamine 3; comparison with dodecanoyl-N-methylhistamine 4 comicellized with Brij 35 reveals th…
Gram-scale quantities of microcrystalline powdered CeO2–ZrO2 solid solutions can be produced continuously in a near-critical water flow reactor at ca. 300 °C and 25 MPa; rapid hydrothermal co-precipitation leads to nano-particulate Ce1−xZrxO2 (x = 0 to 1), the composition of which is merely determined by the initial c…
Layer-by-layer supramolecular structures composed of alternate layers of negatively charged enzymes and cationic redox polyelectrolyte have been assembled. Glucose oxidase (GOx), lactate oxidase (LOx) and soybean peroxidase (SBP) have been electrically wired to the underlying electrode by means of poly(allylamine) wit…
A search for the occurrence of the rare pi-helix was performed with Iditis from the Oxford Molecular Group upon the Protein Data Bank. In 8 of the 10 confirmed crystal structures that harbor the pi-helix, its unique conformation has been linked directly to the formation or stabilization of a specific binding site with…
The effects of zinc borate (ZB), aluminum trihydrate (ATH), and their mixture on the flame-retardant and smoke-suppressant properties of poly(vinyl chloride) (PVC) as well as their mechanism for flame retardancy and smoke suppression were studied through the limiting oxygen index (LOI) test, smoke density test, TGA, G…
The fused deposition of ceramics (FDC) technique was used to fabricate piezoelectric ceramic skeletons for the development of piezoelectric composite transducers with 2–2 connectivity for medical imaging. The green parts were designed to have 30 vol% lead zirconate titanate ceramic (PZT‐5H) in the final composites. Ph…
We have conducted comprehensive electron spin resonance (ESR) investigations on single crystals of the one-dimensional organic compounds $(\mathrm{TMTTF}{)}_{2}{\mathrm{PF}}_{6}, (\mathrm{TMTTF}{)}_{2}{\mathrm{ClO}}_{4},$ $(\mathrm{TMTTF}{)}_{2}\mathrm{Br},$ $(\mathrm{TMTSF}{)}_{2}{\mathrm{PF}}_{6},$ and $(\mathrm{TMT…
The laboratory combustion technique operating on a typical combustor of a gas turbine engine is used for soot sampling. Soot particles are derived by combustion of a hydrocarbon C3H8–n-C4H10 mixture at typical cruise conditions. Size, morphology, microstructure, surface area, porosity, and the chemical nature of the s…
We developed the uniaxial strain method to compress a crystalline sample along any direction without involving Poisson’s effect. The uniaxial strain is realized by inserting a composite of either the sample embedded in epoxy or the sample in frozen oil into a cylinder much harder than the sample composite followed by…
The effect of crystalline morphology on the hydrolytic degradation behavior of poly(butylene succinate) (PBS) in an alkaline solution was investigated by using scanning electron microscopy, gel permeation chromatography, and weight loss measurement. Morphological changes were induced on PBS samples by different therma…
1. The GW Approximation and Vertex Corrections 2. The LDA+U Method: Screened Coulomb Interaction in the Mean-Field Approximation 3. LDSA and Self-Interaction Correction 4. Orbital Functionals in Density Functional Theory: The Optimized Effective Potential Method
In the presence of octadecylamine, poly(propylene imine) dendrimers modified with long alkyl chains self-assemble to form well-defined aggregates that stabilise for periods exceeding 14 days the normally unstable amorphous calcium carbonate (ACC) which persists in competition with the thermodynamic product, calcite.
The electronic absorption spectrum of free-base porphin has been studied at density-functional theory (DFT) level using the time-dependent perturbation theory approach. The optimization of the molecular structure was carried out using the Becke–Perdew functional and split-valence quality basis sets augmented by polari…
The passive film formed by electrochemical oxidation on two different stainless steels differing in molybdenum (Mo) content in physiological solution with and without the addition of complexing agent, i.e., citrate, was studied using X-ray photoelectron spectroscopy. The alloys were polarized at different oxidation po…
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When nanotubes form in a carbon arc, the presence of boron results in long boron-doped carbon nanotubes which are generated as dominant zigzags. Metallic behaviour is observed, in contrast to carbon nanotubes, which are semi-conducting.
Comparisons of simple shear, oscillatory, and creep flow rheological behaviors are presented for several poly(propylenimine) dendrimers (DAB), hyperbranched (HBP) polyesters, and poly(ether−imide) (PEI) HBPs. Variables examined include molecular weight, degree of branching, nature of peripheral groups, and molecular a…
The use of time-resolved 337 nm and 248 nm laser flash photolysis with transient absorbance detection has shown direct evidence of electron transfer from dGMP to the triplet state of riboflavin (3RF*). dGMP was used as a DNA model system in order to study the damaging potential of photoexcited riboflavin. The evidence…
Clay–polyimide [3,3′, 4,4′-benzophenone tetracarboxylic dianhydride–4,4′-oxydianiline (BTDA–ODA)] nanocomposites were synthesized from ODA-modified montmorillonite (organoclay) and poly(amic acid). The layered silicates of organoclay were intercalated by polyimide (BTDA–ODA), as confirmed by X-ray diffraction and by t…