Materials Literature
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Novel 5-(5-carboxy-2-thienyl)-10,15,20-tris(2,4,6-trimethylphenyl)-porphyrinatozinc(II) (Zn5S), 5-(5-carboxy-2-furyl)-10,15,20-tris(2,4,6-trimethylphenyl)porphyrinatozinc(II) (Zn5O), and 5-(4-carboxy-2-thienyl)-10,15,20-tris(2,4,6-trimethylphenyl)porphyrinatozinc(II) (Zn4S) were synthesized to evaluate the spacer effe…
The spectroscopic properties of CdSe/ZnS quantum dots (QDs) were observed to change as a function of thioalkyl acid ligand. Experiments were performed using 2, 3, 6, and 11-carbon linear thioalkyl acids, as well as mercaptosuccinic acid (MSA) and dihydrolipoic acid (DHLA). Bathochromic shifts of up to 14 nm in the emi…
The selective crystallization of either α or γ polymorph of glycine was obtained by both static and dynamic membrane crystallization. The membrane matrix acts as a selective medium for solvent evaporation by modulating the rate for the achievement of supersaturation. In static membrane system this was obtained by chan…
Biosilica structures containing foreign proteins with desired functionalities can be generated by a molecular genetic method. An enzyme immobilized in diatom silica was found to display better activity than purified hydroxylaminobenzene mutase in solution. Such immobilized active biomolecules may find application for…
The dispersion of single-walled carbon nanotubes (SWNT) in poly(ε-caprolactone) with the aid of a zwitterionic surfactant is reported. Melt rheology and electrical conductivity measurements indicate geometrical percolation and electrical percolation for nanocomposites with ∼0.08 wt % SWNT, implying an effective anisot…
A new micromechanical technique was developed to study the mechanical properties of single collagen fibrils. Single collagen fibrils, the basic components of the collagen fiber, have a characteristic highly organized structure. Fibrils were isolated from collagenous materials and their mechanical properties were studi…
Based on density functional theory (DFT), four different methods with the generalized gradient approximation (GGA) have been employed to investigate the structural and electronic properties of the four polymorphs (alpha.H2O, beta, gamma, and epsilon phases) of CL-20, which is a well-known high energy density compound…
To study the electronic interactions in donor-acceptor (D-A) ensembles, D and A fragments are coupled in a single molecule. Specifically, a tetrathiafulvalene (TTF)-fused dipyrido[3,2-a:2',3'-c]phenazine (dppz) compound having inherent redox centers has been synthesized and structurally characterized. Its electronic a…
Aqueous suspensions of length selected single-walled carbon nanotubes were studied by atomic force microscopy (AFM) in order to probe the influence of sonication on nanotube scission. The maximum of the tube length distribution, lM, initially exhibits a power law dependence on the sonication time, t - roughly as lM ap…
Extraordinary structure: An unprecedented Co12 supercluster in which three Co4O4 cubes surround a central μ6-nitrate ligand exhibits single-molecule magnet behavior. The picture shows the structure of the Co12 core and the temperature dependence of the in-phase (χ′, full symbols) and out-of-phase (χ′′, open symbols) c…
PURPOSE: To retrospectively review data in 13 patients with biopsy-confirmed nephrogenic systemic fibrosis (NSF), assess the associated risk factors, and report the incidence of NSF at the authors' institution. MATERIALS AND METHODS: This HIPAA-compliant study had institutional review board approval; informed consent…
Copper/lophine core/shell nanocomposites were fabricated through the self-assembly of lophine on the surfaces of copper nanostructures. The growth of the lophine shells was induced by the cooperation of coordination and several other noncovalent interactions. The dimensions, structures, and morphologies of the nanocom…
The molecular mobility of peroxy radicals at the ends of isolated polystyrene chains (IPSOO) tethered on the solid surface of poly(tetrafluoroethylene) (PTFE) was investigated in a vacuum in the temperature range from 10 to 250 K by electron spin resonance spectroscopy. The onset of an anisotropic tumbling motion of I…
The pulsed field gradient nuclear magnetic resonance method has been used to study self-diffusion of cyclohexane in a commercial MCM-41 material at different external gas pressures from zero to saturated vapor pressure. It is found that the effective diffusivities exhibit three different regions with increasing pressu…
We present experimental studies on the dielectric properties of amorphous cerium dioxide in Au–CeO 2 –Au systems on strontium titanate substrates. From measurements of the capacitance versus contact area we calculated the dielectric constant of cerium dioxide at room temperature to be r = 26.9 ± 0.5. These measurement…
[structure: see text] The synthesis of a Pacman heterobisporphyrin associating an octaethyl porphyrinatozinc (ZnOEP) energy donor and a triaryl porphyrinatozinc (ZntPP) energy acceptor around a calix[4]arene spacer is described. Contrary to previous symmetrical architectures, correlations between the chromophores in t…
A ray-theoretic account of the passage of light through a radially inhomogeneous transparent sphere has been used to establish the existence of multiple primary rainbows for some refractive index profiles. The existence of such additional bows is a consequence of a sufficiently attractive potential in the interior of…
Gold nanoparticles (Au NP) have been synthesized in aqueous phase under ambient conditions in the presence of a series of various cationic double chain as well as dimeric (gemini) surfactants. The spacer chain and twin tail length of these surfactants has been systematically varied to see the effect of hydrophobicity…
The formation of cadmium sulfide (CdS) particles in the gaps between the layers of the multilamellar vesicles is described, introducing a new pathway in the preparation of nanometer-scale particles. The in situ structural characterization of both the CdS particles and the vesicles as a reaction medium was performed in…
Poly( d, l -lactide)s with fluorocarbon functional groups located at either the chain end or center are synthesized by the ring-opening solution polymerization of d, l -lactide using monohydroxy or dihydroxy terminated semifluorinated alcohols as co-initiators respectively. The surface composition−depth profiles of th…