Materials Literature
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Abstract Hierarchical porous silica, particles or monoliths, were synthesized by polycondensation of sodium silicate in the presence of cetyltrimethylammonium bromide and ethyl acetate at different concentrations under hydrothermal conditions. They were used as the support for the immobilization of β‐galactosidase fro…
This paper investigates the voltage hysteresis effect and residual birefringence in the polymer-stabilized blue phase I and II, under various phase separation conditions. By irradiating samples with ultraviolet (UV) light and curing the samples at a reduced temperature, the polymer in the blue phase formed a compact n…
The rate constants of intermolecular photoinduced electron transfer from triplet excited states of metalloporphyrins to a series of p-benzoquinone derivatives in benzonitrile were determined to examine the effects of the driving force, the metal, and the conformational distortion of the porphyrin ring on the reorganiz…
We study the electronic transport properties of a dual-gated bilayer graphene nanodevice via first-principles calculations. We investigate the electric current as a function of gate length and temperature. Under the action of an external electrical field we show that even for gate lengths up 100 \AA{}, a nonzero curre…
PURPOSE: To investigate the transport of Gd-DTPA(2-) in different layers of femoral knee cartilage in vivo. MATERIALS AND METHODS: T(1) measurements (1.5 Tesla) were performed in femoral knee cartilage of 23 healthy volunteers. The weight-bearing central cartilage was analyzed before contrast and at eight time points…
Polyhydroxybutyrate (PHB) was produced by Cupriavidus necator CCGUG 52238 using organic acids from fermented kitchen waste. HPLC and nuclear magnetic resonance (NMR) analyses revealed that the acid comprised mainly of lactic and acetic acids. In shake flask culture, the lactic acid concentration above 10 g/L…
Active doping of B was observed in nanometer silicon layers confined in SiO(2) layers by secondary ion mass spectrometry (SIMS) depth profiling analysis and confirmed by Hall effect measurements. The uniformly distributed boron atoms in the B-doped silicon layers of [SiO(2) (8 nm)/B-doped Si(10 nm)](5) films turned ou…
Abstract We demonstrated an efficient improvement of activity of Ni catalysts by combining with Mo and Mg elements, by which massive growth of multiwalled carbon nanotubes (MWNTs) with straight and double helical structures have been achieved from polypropylene (PP) by means of a one-step combustion method. Scanning e…
Verdrehte Organisation: Die Pyrolyse von Filmen eines Komposits aus nanokristalliner Cellulose (NCC) und Kieselgel ergibt mesoporöse Kohlenstoffmaterialien mit weitreichender chiraler Organisation (siehe Bild). NCC fungiert als Templat, und das Kohlenstoffprodukt hat eine hohe spezifische Oberfläche (>1400 m2 g−1) und…
The oxidation of the Ni(111) surface is studied experimentally with low-energy electron microscopy and theoretically by calculating the electron reflectivity for realistic models of the NiO/Ni(111) surface with an ab initio scattering theory. Oxygen exposure at 300 K under ultrahigh-vacuum conditions leads to the form…
First-principles calculations reveal large zone-center spin-phonon coupling and magnetically-driven phonon anisotropy in cubic perovskites Sr$M$O${}_{3}$ ($M=\text{V}$,Cr,Mn,Fe,Co). In particular, the frequency and splitting of the polar Slater mode is found to depend strongly upon magnetic ordering. The coupling is p…
Ni with different purities between 99.69 and 99.99 wt.% was deformed by high-pressure torsion (HPT) to high strains, where no further refinement of the microstructure is observed. The HPT deformation temperature varied between -196 and 400 °C. Both impurities and temperature significantly affect the lower limit of the…
The process of selecting, manufacturing, and installing a large quantity (2500 km) of commercially available radiation tolerant specialty fibers is described. Radiation tests of various types of fibers from different manufacturers provided sufficient understanding of the radiation effects to select the best performing…
We study the vortex dynamics of Na${}_{x}$Ca${}_{1\ensuremath{-}x}$Fe${}_{2}$As${}_{2}$ single crystals with $x$ = 0.5 (underdoped) and $x$ = 0.75 (optimally doped), having ${T}_{c}$ \ensuremath{\approx} 19.4 and 33.4 K, respectively, by performing magnetization measurements of the critical current density ${J}_{c}$ a…
A mid-IR wire-grid polarizer with a 500 nm pitch was fabricated on a low toxic chalcogenide glass (Sb-Ge-Sn-S system) by the thermal imprinting of periodic grating followed by the thermal evaporation of Al metal. After imprinting, deposition of Al on the grating at an oblique angle produced a wire-grid polarizer. The…
CC coupling of 1,7-dibromoperylene bisimide with sterically hindered 2,6-di-tert-butylphenol by a carbon nucleophilic substitution reaction in the absence of transition-metal catalysts gave novel halochromic perylene bisimides (see picture). The corresponding phenolate ions of these compounds exhibit unprecedented NI…
The controlled release of diclofenac sodium (DFNa) from a chitosan-oxidized konjac glucomannan (CTS-OKG) polymer film was studied. Konjac glucomannan (KGM) was initially oxidized by sodium periodate and then cross-linked to CTS via imine bonds (-C=N-) to form the new CTS-OKG copolymer. The DFNa loaded CTS-OKG polymers…
To address the issue of electron correlation driven superconductivity in graphene, we perform a systematic quantum Monte Carlo study of the pairing correlation in the $t\ensuremath{-}U\ensuremath{-}V$ Hubbard model on a honeycomb lattice. For $V=0$ and close to half filling, we find that pairing with $d+id$ (${d}_{{x}…
An open and closed case: The photochromic bisthienylethene BTTE based on benzobisthiadiazole exhibits excellent photochromic performance in both solution and single crystals (see picture). BTTE shows excellent thermal stability, which is comparable to the widely known five-membered hexafluorocyclopentene-based counter…
We study the magnetic excitation spectra in the paramagnetic state of BaFe(2)As(2) from the ab initio perspective. Both the one-particle and the magnetic two-particle excitation spectra are determined within the combination of the density functional theory and the dynamical mean-field theory method. This method reprod…