Materials Literature
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Strukturwechsel: Für eine stimulierte Peptidselbstorganisation braucht es eine Balance zwischen Konformationsänderung und struktureller Kontinuität stabiler β-Faltblätter. In einem amphiphilen Bipyridin-Tripeptid-Modell gelingt der reversible Morphologiewechsel zwischen Vesikeln und Nanofasern durch Temperatur und Ult…
Gold nanoparticles were synthesized by a hot-wire generator at atmospheric pressure using a gold-platinum composite wire. At low gas flow velocities the nanoparticles were found to be agglomerates of partially sintered primary particles. By reducing the tube size via the insertion of a nozzle with a throat diameter of…
Finite shear elasticity has been identified in the liquid state. The study is expanded to a van der Waal's molecular glass-former, o-terphenyl, and to an ordinary polymer melt, polybutylacrylate, as a function of their molecular weight. These fluids exhibit shear elasticity at the sub-millimetre scale and far above an…
Epitaxial SrTi${O}_{3}$ (STO)/Si templates open a unique opportunity for the integration of ferroelectric oxides, such as BaTi${O}_{3}$ on silicon and for the realization of new devices exploiting ferroelectricity. STO itself has been shown as ferroelectric at room temperature when deposited in thin layers on Si, whil…
We have theoretically investigated the influence of antireflective sub-wavelength structures on a monolithic white light-emitting diode (LED). The simulation is based on the rigorous coupled wave analysis (RCWA) algorithm, and both cylinder and moth-eye structures have been studied in the work. Our simulation results…
Electrospinning is a technique for producing micro- to nano-scale fibers. Fibers can be electrospun with varying degrees of alignment, from highly aligned to completely random. In addition, fibers can be spun from a variety of materials, including biodegradable polymers such as poly-L-lactic acid (PLLA). These charact…
The up-conversion (UC) photoluminescence and ferroelectric properties of Bi4−xErxTi3O12 (BErT) thin films were studied in terms of annealing temperature and Er3+ doping concentration. The thin films were prepared by chemical solution deposition method. There are two green emission bands centered at 527 and 548 nm, and…
We report an unprecedented hierarchical self-assembly of an achiral twin-tapered bi-1,3,4-oxadiazole derivative (2,2-bis(3,4,5-trioctanoxyphenyl)-bi-1,3,4-oxadiazole, BOXD-T8). This molecule can form a layer-structured lyotropic liquid crystal and further forms a helical fibrous organogel in DMF at concentrations abov…
We report an experimental investigation of the edge effect on the room-temperature transport in graphene nanoribbon and graphene sheet (both single-layer and bilayer). By measuring the resistance scaling behaviors at both low- and high-carrier densities, we show that the transport of single-layer nanoribbons lies in a…
A new approach to prepare and characterize prestressed competitive double network elastomeric systems was investigated. A styrene−butadiene−styrene (SBS) triblock copolymer system containing physical cross-links was used to achieve a double network by additional chemical cross-linking using ultraviolet (UV) light. Pro…
Pt/ZnO nanorod (NR) and Pt/modified ZnO NR Schottky barrier ultraviolet (UV) photodetectors (PDs) were prepared with different seed layers and metal oxide modifying layer materials. In this paper, we discussed the effect of metal oxide modifying layer on the performance of UV PDs pre- and post-deposition annealing at…
We show how an oxidative pretreatment of Fe, Co, or Ni growth catalyst on SiO2 support can be used to switch the growth mode of carbon nanotubes from tip growth to root growth, thus favoring the growth of dense, vertically aligned nanotube forests. The oxidative treatment creates a strong catalyst–support interaction…
Abstract This is the first report on an AlN/diamond heterojunction field effect transistor (HFET). The AlN epilayer is grown on oxygen‐terminated (111) diamond substrates using metalorganic vapor phase epitaxy at a temperature as high as 1240 °C. The transistor and gate capacitance–voltage characteristics indicate tha…
Porphyrin-2,3-dione mono- and dioximes were used as starting materials for the efficient syntheses of mono- and bis-quinoline-annulated porphyrins and their corresponding N-oxides. Owing to an extended π-system, these novel porphyrinoid chromophores show significantly red-shifted UV-vis spectra compared to the parent…
The initial stages of epitaxial graphene growth were studied by characterization of graphene formed in localized areas on C-face 6H-SiC substrates. The graphene areas were determined to lie below the level of the surrounding substrate and showed different morphologies based on size. Employing electron channeling contr…
In this paper, a hydrodynamic model coupling electron and phonon transport in silicon semiconductors has been formulated to describe off-equilibrium phenomena. Closure relations for the higher order moments and the production terms have been obtained on the basis of the maximum entropy principle of extended thermodyna…
Nanoporous membranes are used as templates for polyelectrolyte encapsulation of colloidal nanoparticles, leading to colloidally dispersible, multifunctional, and multicompartment microfibers. The protocol is simple and independent of the chemical nature of the nanoparticles and polyelectrolytes. Furthermore, the surf…
Abstract The thermal, mechanical, and structural properties of poly(methyl methacrylate) (PMMA) samples casted from solutions of chloroform, toluene, and N , N ‐dimethylformamide (DMF) were investigated by means of differential scanning calorimetry, nanoindentation, and Fourier transform infrared spectroscopy, respect…
A novel heterogenized Pd(II) organometallic catalyst was synthesized by coordinating Pd(II) ions with PPh2-functionalized silica nanospheres containing an ordered mesoporous structure. This catalyst exhibited higher activity and selectivity in a water-medium for the Barbier, Sonogashira and Ullmann reactions than the…
Using molecular simulation, we establish the pivotal role played by liquid polymorphs during the crystallization of silicon. When undercooled at a temperature 20% below the melting point, a silicon melt is under the form of the highly coordinated, high-density liquid (HDL) polymorph. We find that crystallization start…