Materials Literature
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The synthesis of perylene and terrylene chromophores carrying a single poly(ethylene oxide) chain is presented. These chromophores reveal a strong solvatochromic behavior: High fluorescence in nonpolar solvents and weak fluorescence in polar solvents which is mainly attributed to aggregation. Therefore, such chromopho…
The fabrication of organic–inorganic hybrid nanotubes organized into concentric layers is described. Self-assembly of glycolipids inside the confined nanospace of hollow cylindrical silica nanotubes produced a hybrid nanotube consisting of two concentric layers, one of silica and one of lipid. Addition of glucopyranos…
The crystal structure of Ba2LaTi2Nb3O15 was determined using high resolution powder neutron diffraction data collected at 100 K and 400 K. Both structures, refined in space groups P4bm (100 K) and P4/mbm (400 K), are closely related tetragonal tungsten bronzes with Ba in large 15-coordinate sites, La in 12-coordinate…
Chlorins/oxochlorins bearing distinct patterns of substituents are valuable compounds in bioorganic and materials chemistry. Treatment of a 5,10-diaryl-substituted chlorin or oxochlorin with TFA-d(1) resulted in selective deuteriation of the remaining meso positions (15, 20) rather than any of the beta-pyrrolic positi…
The non-emissive supramolecular assembly of urea end-capped oligo(p-phenylenevinylene) flourophores turned strongly emissive in the presence of tetrabutylammonium flouride which has implications in the anion controlled design of supramolecular architectures with tunable emission properties.
Oilfield formation damage by scale formation can occur when two incompatible brine streams are mixed. A common method for preventing scale formation is the use of chemical scale inhibitors such as aminotri(methylene phosphonic acid) (ATMP). Scale inhibitors are injected and retained in the reservoir by adsorption and/…
The energies of zinc-blende and rocksalt structures FeN and CoN were calculated as function of lattice constant using the local density approximation and generalized gradient approximation density functional methods and the linear muffin-tin orbital band-structure method. The zinc-blende structure is found to be prefe…
We derive an expression for the free energy of the blends of block copolymers expressed as a functional of the density distribution of the monomer of each block. The expression is a generalization of the Flory−Huggins−de Gennes theory for homopolymer blends and also a generalization of the Ohta−Kawasaki theory for the…
Mesostructured thin films of CeO2, ZrO2and CeO2–ZrO2 mixed oxides with highly crystalline pore walls and ordered arrays of mesopores were obtained by a straightforward fabrication process employing evaporation-induced self-assembly (EISA) and a well-designed temperature treatment, taking advantage of a novel type of a…
Nanoindentation-induced interlayer bond switching and phase transformation in carbon nanotubes (CNTs) and graphite are simulated by molecular dynamics. Both graphite and CNTs experience a soft-to-hard phase transformation at room temperature at compressive stresses of 12 and 16 GPa, respectively. Further penetration l…
Novel hierarchical HgS dendrites were synthesized in high yield by hydrothermal treatment of a mercury (II)-thiourea complex. The individual HgS dendrite consists of a long central trunk with secondary and tertiary sharp branches, which preferentially grow parallel to the (001) plane. The possible growth process is pr…
The kinetics of the water−gas shift reaction (WGSR) over a commercial copper/zinc oxide/alumina catalyst has been studied. Experiments were carried out in an isothermal plug-flow reactor at temperatures ranging from 453 to 490 K and a pressure of 0.3 MPa. Sixteen redox and associative models were proposed to obtain ra…
The reported Mn(II)-azide system is the first example of a two-dimensional homometallic ferrimagnet, in which the magnetic properties are due exclusively to topological reasons related with the coordination mode of the bridging ligands; it is also the first case in which a system of this kind exhibits long range order…
Galactokinase functions in the Leloir pathway for galactose metabolism by catalyzing the MgATP-dependent phosphorylation of the C-1 hydroxyl group of alpha-D-galactose. The enzyme is known to belong to the GHMP superfamily of small molecule kinases and has attracted significant research attention for well over 40 year…
OBJECTIVES: Chronic pulmonary infection by Pseudomonas aeruginosa in cystic fibrosis patients is virtually impossible to eradicate by means of existing free antibiotics. We sought to assess the antibacterial activities of liposomal gentamicin against clinical isolates of P. aeruginosa. METHODS: Gentamicin was encapsul…
Deformation-induced phase transitions and superstructure formation in poly(ethylene terephthalate) (PET) were studied by means of in-situ synchrotron small-angle X-ray scattering (SAXS) and wide-angle X-ray diffraction (WAXD) as well as Raman spectroscopy. The deformation conditions involved uniaxial stretching of que…
ADVERTISEMENT RETURN TO ISSUEPREVCommunication to the...Communication to the EditorNEXTNanoporous Polystyrene Containing Hydrophilic Pores from an ABC Triblock Copolymer PrecursorJavid Rzayev and Marc A. HillmyerView Author Information Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455-0431…
Many of water's peculiar physical properties are still not well understood, and one of the most important unresolved questions is its glass transition related dynamics. The consensus has been to accept a glass transition temperature (T(g)) around 136 K, but this value has been questioned and reassigned to about 165 K.…
We use time-domain electrostatic force spectroscopy (TD-EFS) for characterising the dynamics of mobile ions in a partially crystallised LiAlSiO$_4$ glass ceramic, and we compare the results of the TD-EFS measurements to macroscopic electrical conductivity measurements. While the macroscopic conductivity spectra are de…
We propose a spintronic magnetic field sensor, fashioned out of quantum wires, which may be capable of detecting very weak magnetic fields with a sensitivity of ~ 1 femto-Tesla per root Hertz at a temperature of 4.2 K and ~ 80 femto-Tesla per root Hertz at room temperature. Such sensors have applications in magnetomet…