Materials Literature
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We report an experimental study by electron paramagnetic resonance (EPR) of ${E}_{\ensuremath{\delta}}^{\ensuremath{'}}$ point defect induced by $\ensuremath{\gamma}$-ray irradiation in amorphous $\mathrm{Si}{\mathrm{O}}_{2}$. We obtained an estimation of the intensity of the 10 mT doublet characterizing the EPR spect…
The structures of polydisulfide-based biodegradable macromolecular Gd(III) complexes were modified to improve their in vivo retention time and MRI contrast enhancement. Steric hindrance was introduced around the disulfide bonds to control their access to free thiols in order to alter the degradation rate of the copoly…
The phenomenon of on-off luminescence intermittency---blinking---in silicon nanocrystals was studied using a single-dot microphotoluminescence technique. From recordings of the luminescence intensity trace, on- and off-time distributions were extracted revealing exponential behavior, as expected for systems with blink…
The inclusion of Tb3+ ions doped into the storage phosphor BaFBr:Eu2+ results in increased purity of the host material as well as an improvement in the linearity of the photostimulated luminescence (PSL) intensity versus the x-ray irradiation dose. Films produced by pulsed laser deposition (PLD) also show similar resu…
The metabolic pathway by which beta-D-galactose is converted to glucose 1-phosphate is known as the Leloir pathway and consists of four enzymes. In most organisms, these enzymes appear to exist as soluble entities in the cytoplasm. In yeast such as Saccharomyces cerevisiae, however, the first and last enzymes of the p…
The first example of "Pt"-nanocluster-catalyzed regioselective generation of hybrid polymers via attachment of organic functionalities to evenly distributed Si-H bonds of poly(methylhydro)siloxane is described. In addition, participation of Pt-nanoclusters as an active catalyst was evidenced by various spectroscopic t…
Cancer chemotherapeutic agents are often administered systemically. Following systemic administration, numerous biological factors associated with the tumours influence the delivery of the drugs to the tumours. These factors have been extensively studied for the last 2 decades. The influence of these biological factor…
We kinetically stabilize oil-in-water emulsions comprising paraffin crystals by adsorbing solid particles (silica) of colloidal size at the oil/water interface. We obtain a set of emulsions that are quiescently stable for a long period of time (months), while the same emulsions are destabilized after only a few hours…
Magnetic resonance imaging (MRI) contrast agents are utilized adjunctively to enhance the contrast between normal and abnormal structures on MRI scans. Along with the rapid evolution of the field has come a new appreciation for the medicinal chemistry of this unique class of metallopharmaceuticals. The efficacy of MRI…
Nanoporous carbide-derived carbon (CDC) was synthesized starting with Ti 2 AlC powders via chlorination in the 400−1200 °C temperature range. X-ray diffraction, Raman spectroscopy, and transmission electron microscopy (TEM) confirmed a structural dependence on chlorination temperature. At low chlorination temperatures…
The reactivity of 5/7/7/5 (Stone-Wales, SW) defects is compared to that of the pristine sidewalls of (5,5) and (10,0) carbon nanotubes (CNTs) using density functional theory (PBE). Infinite tube models (periodic boundary conditions) are used to investigate the reaction energy for CH(2) addition to the ten [5,6], [5,7]…
This paper reports on the preparation of poly(methyl methacrylate) (PMMA), poly(n-butyl acrylate) (PBA), and polystyrene (PS) brushes at the surface of conducting materials that were modified by the electrochemical reduction of a brominated aryl diazonium salt BF4-, +N2-C6H4-CH(CH3)-Br (D1). The grafted organic specie…
Iopamidol is one of the most common contrast media used for diagnostic CT-based clinical protocols. Chemically, this molecule contains two pools of mobile protons (amide and alcoholic) that are in exchange with water. At 7.05 T, pH 7.4, and 312 K, the exchange rate of the alcoholic protons is too fast to affect the NM…
The versatility and efficiency of dynamic covalent chemistry (DCC) has been exploited in the convergent synthesis of mechanically interlocked dendrimers that are based upon the mutual recognition expressed between secondary dialkylammonium ions and crown ether-like macrocycles. Reversible imine bond formation is emplo…
Using the first-principles method, we have studied the stability and electronic band structures of the transparent conducting oxides $\mathrm{Sn}{\mathrm{Zn}}_{2}{\mathrm{O}}_{4}$, $\mathrm{Sn}{\mathrm{Cd}}_{2}{\mathrm{O}}_{4}$, and $\mathrm{Cd}{\mathrm{In}}_{2}{\mathrm{O}}_{4}$. Our calculated lowest-energy phases of…
Tiopronin monolayer-protected silver nanoparticles with different core sizes (average diameter = 2, 5, 20 nm) were prepared by using different mole ratios of silver nitrate/tiopronin. Ligands on the silver particles were partially displaced by fluorescein-labeled thiolate single-stranded oligonucleotides or their comp…
We propose a kinetic theory of transport in metals embedded with ferromagnetic nanoclusters, describing the dependence of the form of magnetoresistance on anisotropy characteristics of the ensemble of clusters and the influence of the electron spin depolarisation by clusters. We note that this effect is strongest when…
A microscopic model is employed to calculate the spectrum of spin waves in quasiperiodic magnetic multilayers in the dipole-exchange regime. Results are presented for structures in which thin ferromagnetic films are separated by non-magnetic spacers following a Fibonacci sequence and extend previous magnetostatic calc…
The exchange coupling at the interfaces of magnetic superlattices consisting of ferromagnetic $SrRuO_3$ and antiferromagnetic $SrMnO_3$ grown on (001) oriented $SrTiO_3$ is studied with in-plane and out-of-plane orientations, with respect to the substrate plane, of the cooling magnetic field. The magnetization of the…
We report on magnetic and electrical transport properties of ${\mathrm{Sb}}_{2\ensuremath{-}x}{\mathrm{Cr}}_{x}{\mathrm{Te}}_{3}$ single crystals with $0\ensuremath{\leqslant}x\ensuremath{\leqslant}0.095$ over temperatures from $2\phantom{\rule{0.3em}{0ex}}\mathrm{K}$ to $300\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. A f…