Materials Literature
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We show the growth of high-quality epitaxial graphene on 6$H$-SiC with Raman signatures comparable to exfoliated flakes. We ascribe the remaining low-quality transport properties to the strong electron-phonon coupling to two low-energy phonon modes at 70 and 16 meV. The coupling of these modes is enhanced by the defec…
In this paper, we propose a tunable all optical switch based on metamaterial structure enhanced with metal nanocomposite layer which has adjustable optical properties and strong nonlinear Kerr effect. The results demonstrate an ultrafast, low threshold and high extinction ratio all optical switch with tunable frequenc…
Double-shell composite microcapsule with a ripened CaCO3 nanoparticle outer shell and melamine formaldehyde (MF)/copolymer inner shell shows advantages in adjustable permeability and mechanical strength, comparing with single shell microcapsules. Here, we have systematically studied the effects of certain formulation…
Abstract The impact of grafted surface of cellulose fibers on the mechanical and physical properties of fiber-cement composites (FCC) has been investigated. The grafting was performed with n -octadecyl isocyanate [i.e., with an aliphatic isocyanate (AI)], with the intention to protect the cellulose fiber from alkali d…
Abstract Sintering and consequent deactivation in supported metal catalysts is a severe problem encountered in heterogeneous catalysis. This problem can be addressed by encapsulating active metal nanoparticles within inert oxides such as silica, provided the oxide shell is porous to enable access of reactant molecules…
The aim of this research is to prepare a biomaterial to be used in health care. A series of hydrogels based on polyvinyl pyrrolidone (PVP)/κ-Carrageenan (KC) has been prepared by radiation technique. PVP (5-15%) were mixed with ΚC (2%) and irradiated by gamma rays at the doses from 25 kGy to 35 kGy (dose rate 7 kGy/h)…
We demonstrate active control of plasmonic bandgap on a metallic photonic crystal slab using thermo-optic effects. The Au grating, which is milled by focused-ion beam on a glass substrate, is designed to exhibit an extraordinary optical transmission and a sharp transitional edge for high modulation efficiency. Only a…
Shining a nanobeacon: Single-label nanobeacon sensors were constructed by using graphitic carbon nanoparticles (CNPs) and their oxides as energy acceptors (see figure; FRET=fluorescence resonance energy transfer). Excellent sensing performances were achieved with simplified operation and lowered cost.
The internal organization of a fifth-generation dendronized polymer (PG5) has been investigated by atomistic molecular dynamics simulations in a vacuum. This study reveals an exceptional behavior of PG5 within the homologous series of g-generation PGg polymers. Three molecular configurations, which present a heterogen…
Schlanke Gäste sind willkommen: Aromatische makrobicyclische Amphiphile selbstorganisieren über ihre Flächen zu dimeren Micellen, die wiederum durch laterale Assoziation poröse Schichten mit nanometergroßen Poren bilden. Die Schichten interkalieren planare Gastmoleküle und werden dabei reversibel von porösen in geschl…
We study the dispersion relations and spectra of invariant Schr\"odinger operators on a graphyne structure (lithographite). In particular, description of different parts of the spectrum, band-gap structure, and Dirac points are provided.
Pd-catalyzed Sonogashira cross-coupling reactions were used to synthesize novel π-conjugated oligothienylene-ethynylene dendrons and their corresponding terpyridine-based ligands. Their complexation with Ru(II) led to interesting novel metallodendrimers with rich spectroscopic properties. All new compounds were fully…
The intramolecular exchange interactions within the single-molecule magnet (SMM) ``butterfly'' molecule [Fe${}_{3}$Ln(${\ensuremath{\mu}}_{3}$-O)${}_{2}$(CCl${}_{3}$COO)${}_{8}$(H${}_{2}$O)(THF)${}_{3}$], where Ln(III) represents a lanthanide cation, are determined in a combined experimental [x-ray magnetic circular d…
Semicrystalline/fluorinated side-chain crystalline block copolymers, dinonylphenyl end-capped poly(ethylene glycol)- block -poly(fluorinated methyl methacrylate) (DNPEPEO- b -PFMAs), were synthesized by ATRP of 3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,10-heptadecafluorodecyl methacrylate using a surfactant poly(ethylene glyc…
Measurements of the temperature dependence of the charge carrier mobility in single-crystal chemical vapour deposition diamond using the transient current technique are presented in a temperature range from 2 K to room temperature. An α-source is used to create free charge carriers in the diamond bulk. The evolution o…
Enhancements of the Raman signal by the newly prepared gold-palladium and gold-platinum double-shell hollow nanoparticles were examined and compared with those using gold nanocages (AuNCs). The surface-enhanced Raman spectra (SERS) of thiophenol adsorbed on the surface of AuNCs assembled into a Langmuir-Blodgett monol…
We demonstrate that the inclusion of van der Waals dispersive interaction sensibly improves the prediction of lattice constants by density functional theory in iron-chalcogenides (FeCh) superconductor compounds, namely FeSe and FeTe. We show how generalized gradient approximation (GGA) for the exchange correlation pot…
Heteroepitaxial growth of Cr metal on Nb-doped SrTiO₃(001) is accompanied by Cr diffusion to interstitial sites within the first few atomic planes, an anchoring of the Cr film to the substrate, charge transfer from Cr to Ti, and metallization of the near-surface region, as depicted in the figure. The contact resistanc…
The angular spectrum (AS) method is a popular solution to the Helmholtz equation without the use of approximations. Modified band-limited AS methods are of particular interest for the cases of high-off-axis and large distance propagation problems, because conventional AS methods are impractical due to requirements reg…
Surface pyroelectricity: Centrosymmetric crystals of α-glycine display an anomalous quadrupole-like pyroelectric current. This observation implies the formation of water–glycine hybrid polar layers at the (010) faces of the α-glycine crystals (see picture).