Materials Literature
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Drugs turn the light off: Conjugated polyelectrolytes (CPEs) have been used in fluorescent assays for real-time screening of small molecules that prevent the RNA-protein complexation that is important for virus replication and thereby can be considered potential initial candidates for drug discovery (see picture).
The nonisothermal melt crystallization kinetics of polypropylene (PP) and polypropylene/single-walled carbon nanotube (PP/SWNT) nanocomposite were analyzed according to Avrami and Mo models. The values of half-life, corrected composite rate constant and F(T) indicated that the crystallization rate increased with the i…
We report a theoretical study of hydroxyl vacancies in aluminosilicate and aluminogermanate single-walled metal-oxide nanotubes. Defects are introduced on both sides of the tube walls and lead to occupied and empty states in the band gap which are highly localized both in energy and in real space. Different magnetizat…
Our tribological experiments on nanocrystalline (nc) Ni (grain size down to approximately 10 nm) showed significant reductions in both, the coefficient of friction and wear rate compared to its microcrystalline (mc) counterpart. A consistent relationship was found between grain size, hardness and tribological behavior…
Abstract We present the synthesis of symmetrical (pyrrolidine‐salen)Cr III complexes immobilized on hyperbranched polyglycerol 1 through linkers of different lengths and their application in the asymmetric ring‐opening of meso ‐epoxides. This reaction proceeded through a cooperative bimetallic mechanism and for the po…
Subambient thermal decomposition of ruthenium tetroxide from nonaqueous solution onto porous SiO(2) substrates creates 2-3 nm thick coatings of RuO(2) that cover the convex silica walls comprising the open, porous structure. The physical properties of the resultant self-wired nanoscale ruthenia significantly differ de…
A synergistic effect on flame retardancy was found when hydroxy silicone oil (HSO) was incorporated into ethylene vinyl acetate/aluminum hydroxide (EVA/ATH) composite. The fire performance of EVA and EVA composites was studied by using limiting oxygen index (LOI), UL 94, and cone calorimeter test (CCT). Compared with…
A well-reproducible and completely green route towards highly water dispersible multi-walled carbon nanotubes (MWNT) is achieved by a non-invasive, polymer wrapping technique, where the polymer is adsorbed on the MWNT's surface. Simply mixing an amino-acid-based polymer derivative, namely poly methacryloyl beta-alanin…
Extensive calculations using density functional theory enable us to explain the origin of the surprising room-temperature conversion of anatase to rutile phase of ${\text{TiO}}_{2}$ when doped with Co and Ni, but not with Cu. Contrary to earlier suggestion, neither high spin nor strain of the transition metals is foun…
Among the many and varied applications of nanotechnology, the dispersion of nanoscopic fillers to form polymer nanocomposites with improved fire behaviour illustrates the potential and diversity of nanoscience. Different polymers decompose in different ways and fire retardants act to inhibit the decomposition or flami…
Abstract Metallophilic Au⋅⋅⋅Ag interactions exist in concentrated solutions as well as in the 2D polymeric solid‐state structure of [AuAg 3 (C 6 F 5 )(CF 3 CO 2 ) 3 (CH 2 PPh 3 )] n (see picture for the asymmetric unit) according to EXAFS and pulsed‐gradient spin‐echo NMR spectroscopy measurements. Calculations suppor…
A novel method that enables single-crystal diffraction data to be obtained from a powder sample is presented. A suspension of LiCoPO(4) microrods was subjected to a frequency-modulated dynamic elliptical magnetic field to align the microrods; the alignment achieved was consolidated by photopolymerization of the suspen…
The stability of Pd dendrimer-encapsulated nanoparticles (DENs) in air-, N(2)-, and H(2)-saturated aqueous solutions is reported. The DENs consisted of an average of 147 atoms per sixth-generation, poly(amidoamine) dendrimer. Elemental analysis and UV-vis spectroscopy indicate that there is substantial oxidation of th…
Fascinating packing patterns of identical spherical and discotic objects on curved surfaces occur readily in nature and science. Examples include C(60) fullerenes, (1, 2) 13-atom cuboctahedral metal clusters, (3) and S-layer proteins on outer cell membranes. (4) Numerous situations with surface-arranged objects of var…
The adsorption of the anionic surfactants sodium dodecyl sulfate (SDS) and sodium dodecyl benzene sulfonate (SDBS) in poly(ethylene oxide) (PEO) brushes was studied using a fixed-angle optical flow-cell reflectometer. We show that, just as in solution, there is a critical association concentration (CAC) for the surfac…
We measured the single-photon detection efficiency of NbN superconducting single-photon detectors as a function of the polarization state of the incident light for different wavelengths in the range from 488 nm to 1550 nm. The polarization contrast varies from ~5% at 488 nm to ~30% at 1550 nm, in good agreement with n…
The ground and first excited states of PaX(6)(2-) (X=F,Cl,Br,I), UX(6)(-) (X=F,Cl,Br) and NpF(6) are calculated using the spin-orbit complete active space perturbation theory at second order method and the g-factors are deduced. The isotropic g-matrix is built from first principles, and the g-factors are found to be n…
Morphology and deformation mechanisms and tensile properties of tetrafunctional multigraft (MG) polystrene- g -polyisoprene (PS- g -PI) copolymers were investigated dependent on PS volume fraction and number of branch points. The combination of various methods such as TEM, real time synchrotron SAXS, rheo-optical FTIR…
Substantial dipoles are formed at interfaces between metals and organic molecules, even in case of relatively weak interactions. We monitor interface dipoles by first-principles calculations of work function changes caused by adsorption of perylene and 3,4,9,10-perylene-tetra-carboxylic-dianhydride monolayers. These c…
Morphology variation: The Boc-alanine linked OPV exhibits an unprecedented formation of periodic macroporous honeycomb structures in chloroform and aligned fiber bundles in toluene (see SEM images). This represents a unique example for a distinct morphology change of an organogelator from macroporous honeycomb to alig…