Materials Literature
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A comprehensive ellipsometric study was performed on Fe$_{1-x}$Co$_{x}$Si single crystals in the spectral range from 0.01 eV to 6.2 eV. Direct and indirect band gaps of 73 meV and 10 meV, respectively, were observed in FeSi at 7 K. One of four infrared-active phonons that is energetically close to the direct absorptio…
Hierarchical roughness is beneficial for superhydrophobic and self-cleaning surfaces. Biomimetic hierarchical surfaces were fabricated by replication of a micropatterned master surface and self-assembly of two kinds of tubular wax crystals, which naturally occur on the superhydrophobic leaves of Tropaeolum majus (L.)…
The high carrier mobility of films of semiconducting single-walled carbon nanotubes (SWNTs) is attractive for electronics applications, but the presence of metallic SWNTs leads to high off-currents in transistor applications. The method presented here, cycloaddition of fluorinated olefins, represents an effective appr…
We analyze the formation and evolution statistics of single molecule junctions bonded to gold electrodes using amine, methyl sulfide and dimethyl phosphine link groups by measuring conductance as a function of junction elongation. For each link, maximum elongation and formation probability increase with molecular leng…
We have used a combined dynamic scanning tunneling and atomic force microscope to study the organisation of weakly bound adsorbed molecules on a graphite substrate. Specifically we have acquired images of islands of the perylene derivative molecules. These weakly bound molecules may be imaged in dynamic STM, in which…
We compute atomistically the heat conductance for ultra-thin pristine silicon nanowires (SiNWs) with diameters ranging from 1 to 5 nm. The room temperature thermal conductance is found to be highly anisotropic: wires oriented along the <110> direction have 50-75% larger conductance than wires oriented along the <100>…
We present a first-principles study of geometrical structure and energetics of hydrogen adsorbed on hexagonal single-walled silicon nanotubes (SiNTs). The adsorption behaviors of hydrogen molecules in SiNTs are investigated. The binding energies for the most stable physisorbed configurations are calculated to be less…
We simulate the indirect exchange interaction between Mn-rich Mn(Ga)As nanoclusters in GaAs by analytical means. In contrast to the conventional Ruderman-Kittel-Kasuya-Yosida (RKKY) formula which considers the mediation by the carriers in the medium, we also include the contribution from those inside the clusters. Sin…
Abstract Polymer, heal thyself! Dynamic polymers formed by a reversible Diels–Alder reaction were formed and studied by using neutron scattering at room temperature. They were used to obtain thin films that displayed self‐healing at room temperature (see figure). magnified image Dynamers based on reversible Diels–Alde…
Crystal surface templates may improve the electronic properties of conjugated polymers by linking them into two-dimensional networks.
Mesoscale hierarchical helical structures with diverse functions are abundant in nature. Here we show how spontaneous helicity can be induced in a synthetic polymeric nanobristle assembling in an evaporating liquid. We use a simple theoretical model to characterize the geometry, stiffness, and surface properties of th…
Exfoliation of expanded GO represents an attractive route to functionalized graphenes as versatile 2D carbon nanomaterials and components of a wide variety of polymer nanocomposites. Thermally reduced graphite oxides (TrGO) with specific surface areas of 600 to 950 m(2) · g(-1) were obtained by oxidation of graphite f…
The capacity of natural zeolites (ZAPS, ZNT, and ZSL) to adsorb N2O and NO in both static and dynamic regimes was studied experimentally. It was found that the cations present in the zeolites act as centers of adsorption for both gases, suggesting their competitive adsorption. However, a considerable difference was ob…
The ferroelectric-to-ferroelectric phase transition between the high temperature (FE(RH)) and the low temperature (FE(RL)) rhombohedral phases in a Nb-doped Pb(Zr(0.95)Ti(0.05))O(3) ceramic was investigated with transmission electron microscopy (TEM). Both bright field images and electron diffraction patterns were mon…
This presentation will review and compare different purification processes of starting materials and different synthesis processes developed so far to prepare high purity rare-earth doped and un-doped fluoride glasses. Discovered in 1975 at Rennes University and intensively developed for more than 25 years, fluoride g…
We previously demonstrated that the supramolecular self-assembly of cyanines could be useful for developing fluorescent enzymatic assays. We took that concept a step further by synthesizing a covalent adduct of the tetrapeptide Asp-Glu-Val-Asp (DEVD) and a cyanine (DEVD-cyanine). The DEVD-cyanine due to its canonical…
The target of the present computational study was the acid catalyzed bond cleavage of the Si-O and C-O bonds in siloxane, alkoxysilane and ether in aqueous media. In the present study the effect of water as a solvent has been modeled using a full primary solvate shell built up from water molecules connected via hydrog…
In the present study, a new method for searching all exit parameters of the thermoelectric module has been realized. The new method is based on measurement of thermo-emf of a working module and comparing the results obtained with those of classical methods. The new method is used for investigation of the values of par…
Abstract The wettability of PLLA substrates was modified by plasma copolymerising on its surface thin films based on EA and HEA. The composition of the reactive gas inside the plasma chamber was that of the corresponding liquid mixture of the comonomers. The surface of the substrates was investigated by AFM, which sho…
The self-assembly kinetics of a peptide-block-poly(n-butyl acrylate) copolymer (pnBA-(TV){5}{switch}nFGconjugate) in solution and the blend behavior of the resulting fibrillar nanoobjects are investigated. By using a switch peptide segment with temporarily suppressed aggregation behavior, the solution self-assembly of…