Materials Literature
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We calculate the effective resistivity of a macroscopically disordered two dimensional conductor consisting of two components in a perpendicular magnetic field. When two components have equal area fractions, we use a duality theorem to show that the magnetoresistance is non-saturating and at high fields varies exactly…
The first magnetic circular dichroism (MCD) spectra are reported for tetraphenyltetraacenaphthoporphyrin (TPTANP). The impact on the electronic structure of steric interactions between the fused acenaphthalene rings and the meso-tetraphenyl substituents is explored based on an analysis of the optical spectra of the Zn…
We present a simplified computational scheme in order to calculate the effects of electron correlations on the energy bands of diamond and silicon. By adopting a quasiparticle picture we compute first the relaxation and polarization effects around an electron set into a conduction band Wannier orbital. This is done by…
We report magnetic and electrical transport studies of an epitaxially grown trilayer thin film structure comprising La0.59Ca0.41MnO3 sandwiched between La0.67Ca0.33MnO3 electrodes. Since La0.59Ca0.41MnO3 lies at the edge of the thin film ferromagnetic metallic phase field, phase separation effects are expected. These…
The isotropic elastic moduli closest to a given anisotropic elasticity tensor are defined using three definitions of elastic distance, the standard Frobenius (Euclidean) norm, the Riemannian distance for tensors, and the log-Euclidean norm. The closest moduli are unique for the Riemannian and the log-Euclidean norms,…
We investigate theoretically and experimentally how the hydrodynamically correlated lateral motion of particles in a suspension confined between two surfaces is affected by the suspension concentration. Despite the long range of the correlations (decaying as 1/ r 2 with the inter-particle distance r ), the concentrati…
The syntheses of copper and silver delafossite-type oxides from their constituent binary metal oxides, oxide hydroxides and hydroxides, by low temperature (<210 °C) and low pressure (<20 atm) hydrothermal reactions are described. Particular emphasis is placed on how the acid−base character of a constituent oxide deter…
This Account focuses on structural and dynamic behavior of molecules encapsulated in carbon nanotubes. The impact of the confinement on the molecular packing, orientation, translation, rotation, and reactivity is demonstrated for a range of fullerene and nonfullerene molecules. These phenomena are described and analyz…
Colloidal zinc oxide (ZnO) nanocrystals are attractive candidates for a low-temperature and solution-processible semiconductor for high-performance thin-film field-effect transistors (TFTs). Here we show that by controlling the shape of the nanocrystals from spheres to rods the semiconducting properties of spin-coated…
We report that freestanding films of vertically aligned carbon nanotubes exhibit super-compressible foamlike behavior. Under compression, the nanotubes collectively form zigzag buckles that can fully unfold to their original length upon load release. Compared with conventional low-density flexible foams, the nanotube…
The ability of engineered cerium oxide nanoparticles to confer radioprotection was examined. Human normal and tumor cells were treated with nanoceria and irradiated, and cell survival was measured. Treatment of normal cells conferred almost 99% protection from radiation-induced cell death, whereas the same concentrati…
Diamond nanocrystals emit bright fluorescence at 600-800 nm after irradiation by a 3 MeV proton beam (5 x 1015 ions/cm2) and annealing at 800 degrees C (2 h) in vacuum. The irradiation/annealing process yields high concentrations of nitrogen-vacancy defect centers ( approximately 107 centers/mum3), making possible vis…
The localized synthesis of 4.2-5.6 nm-Si nanocrystals (nc-Si) in Si-rich SiO<sub>2</sub> (SRSO) by CO<sub>2 </sub>laser annealing at laser intensity of below ablation-threshold (6 kW/cm<sup>2</sup>) is demonstrated. Since the SRSO exhibits a high absorption coefficient of up to 0.102 cm<sup>-1</sup> at wavelength of 1…
As indicated by the data presented in this chapter, modem electrochemical techniques are useful for MIC investigations. However, the nature of MIC makes it extremely difficult to use electrochemical techniques for detection, quantification, mechanistic studies, or monitoring. MIC is often the result of viable microorg…
In this work, flame retardancy of ethylene-vinyl acetate copolymer (EVA) is investigated incorporating Mg(OH) 2 (MDH) as flame retardant combined with ammonium polyphosphate (APP) as potential synergist. It is shown that APP is a synergistic agent in EVA-MDH formulations in terms of LOI and cone calorimetry. The inter…
We prepared carbon nanospheres by pyrolysis of core cross-linked diblock copolymer micelles. Poly(ethylene oxide)- b -poly(4-ethynylstyrene) (PEO−PES) with a hydrophobic block having curable acetylenic groups was synthesized by atom transfer radical polymerization. The number-average molecular weight ( M n ) of the PE…
Three DTPA-derivative ligands, the non-substituted DTPA-bis(amide) (L(0)), the mono-substituted DTPA-bis(n-butylamide) (L(1)) and the di-substituted DTPA-bis[bis(n-butylamide)] (L(2)) were synthesized. The stability constants of their Gd3+ complexes (GdL) have been determined by pH-potentiometry with the use of EDTA o…
FeCo-Al2O3 nanocomposite aerogels were studied by high-resolution electron microscopy, energy filtered transmission electron microscopy, Mössbauer spectroscopy, and measurements of static magnetizations and hysteretic behavior. The combined use of such techniques provided insights on the formation of bcc FeCo nanocrys…
This paper describes the synthesis and in-depth characterization of two new porphyrogenic macrocycles 1 and 2, and provides an evaluation of these molecules as photosensitizer agents. By tuning the reaction conditions and starting from readily available 1,9-diformyl-5-phenyldipyrromethane (4) and tripyrrane dicarboxyl…
Peptide-based hydrogels have gained interest for biomedical applications as a result of their biodegradability and bioresorbability. For in vivo applications, these hydrogels should be able to easily assemble in a controlled manner and should possess compatibility with entrapped biomolecules. Mutually attractive but s…