Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Absolute values of (79) geminal (2)J((29) Si-O-(29)Si) couplings were measured in an extensive series of (55) unstrained siloxanes dissolved in chloroform-d. Signs of (2)J((29)Si-O-(29)Si) in some (9) silicon hydrides were determined relative to (1)J((29)Si-(1)H) which are known to be negative. It is supposed that pos…
Sesam öffne Dich! Graphennanobänder (GNRs) mit glatten Kanten und einstellbaren Breiten sind für die Anwendung von Graphen in der Elektronik und Spintronik entscheidend. Hochwertige schmale GNRs sind mit einem Cu-Katalysator aus einwandigen Kohlenstoffnanoröhren bei 200–300 °C zugänglich, wobei die Energiebarriere für…
We use inelastic neutron scattering to study the effect of an in-plane magnetic field on the magnetic resonance in optimally doped superconductors FeSe${}_{0.4}$Te${}_{0.6}$ (${T}_{c}=14$ K) and BaFe${}_{1.9}$Ni${}_{0.1}$As${}_{2}$ (${T}_{c}=20$ K). While the magnetic field up to 14.5 T does not change the energy of t…
Research in supramolecular chemistry has been carried out in my laboratory for the past 12 years. Intrigued by the fascinating power of supramolecular chemistry, as seen in biomolecular recognition events in nature, we started out by trying to mimic the basic principles of such recognition events in small artificial m…
The effect of temperature on the charge recombination (CR) rate in bare and dye-sensitized nanocrystalline TiO 2 films was studied by means of transient absorption spectroscopy. For bare TiO 2 films, the CR rate was not sensitive to temperature, indicating that CR occurs by means of tunneling and without trapping of c…
An approximately 125 nm thick pulsed laser deposited blue, nonstoichiometric WO 3−δ film grows on TiO 2 (110) in the [220] direction. Oxidative treatment at 400 °C turns the film color from blue to yellow and improves the film quality considerably, as shown by improvement of the Kiessig oscillations in the X-ray refle…
Current–voltage ( I – V ) and impedance measurements were carried out in doped poly(3-methylthiophene) devices by varying the carrier density. As the carrier concentration reduces the I – V characteristics indicate that the conduction mechanism is limited by metal–polymer interface, as also observed in impedance data.…
Abstract Plasticized polymer materials have taken an enormous role in our everyday life. Most of the common plasticizers are aromatics, esters of phthalic acid. Since they are not chemically bonded to the polymer matrix, they can be released from material while being used. The concerns raised about toxicity led to a l…
Zn K edge and O K edge x-ray absorption near-edge structure (XANES) spectra of ZnO surfaces are calculated. The difference between theoretical XANES for ZnO surfaces and ZnO bulk is then compared to the earlier observed differences between experimental XANES for ZnO nanostructures and ZnO bulk as taken from the litera…
We developed a straightforward synthesis of gold nanoparticles with diameters in the range 2.1-7.0 nm which display solubility in both aqueous and nonpolar (toluene, chloroform) media. This versatile solubility of the nanoparticles is achieved by the use of a thiolated PEG capping agent. Their plasmon resonance band i…
Abstract Dynamic heterogeneity is now recognized as a central aspect of structural relaxation in disordered materials with slow dynamics, and was the focus of intense research in the last decade. Here, this chapter describes how initial, indirect observations of dynamic heterogeneity have recently evolved into well‐de…
The adsorption of and conformation adopted by a branched-linear polymer conjugate to the hydrophilic silica-aqueous solution interface have been studied by in situ null ellipsometry and Monte Carlo simulations. The conjugate is a highly branched polyethyleneimine structure with ethyleneoxide chains grafted to its prim…
The structure and properties of some blends obtained by mixing two semicrystalline samples of isotactic polypropylene (iPP) characterized by different degree of stereoregularity have been analyzed in the whole range of composition. The two components are a highly isotactic and crystalline sample (iPP1) and a stereoirr…
The kinetics of chiral scandium(III)-catalyzed hydroxymethylation of silicon enolates using aqueous formaldehyde have been investigated, and a reaction mechanism of this process in organic/aqueous medium is proposed.
The effects of seed preparation method and operating conditions during the batch cooling crystallization of adipic acid in aqueous solution are reported. Seeds were prepared by cooling crystallization with and without ultrasound and by grinding commercial crystals. The effects of cooling rate, initial concentration, s…
Dense and highly porous silicon oxycarbide ( Si–O–C ) submicrometer‐sized spheres, with diameters in the range 100–400 nm are synthesized through pyrolysis of sol–gel‐derived hybrid precursors. A modified Stöber process is used for the synthesis of silsesquioxane submicrometer‐sized particles from different organotrie…
Watching the changes: Aberration-corrected transmission electron microscopy is used to image CeO2 nanoparticles during an electron-beam-induced structure transformation. Analysis of the phase of the computationally restored exit wavefunction (see Figure, a) allows the nature of the different surfaces (b) to be charact…
The axial positions of planar metallomacrocycles are unoccupied. The positively charged metal is thus a potential binding site for electron-donating groups. The binding strength is affected by the central metal, the ligand, and the macrocycle. One ligand leads to the out-of-plane displacement of the central metal, whe…
Abstract Density functional theory (DFT) calculations were performed by using FP‐LAPW method to investigate the effect of defects on the electronic and magnetic structure of Fe 2 MnSi Heusler alloy. The formation energies were calculated for antisite, swap, and vacancy defects. We found that three defects, namely Mn F…
Abstract A large quantity of linear strain and LCTE data from −55 °C to 75 °C on LX‐17, PBX 9502 and ultrafine TATB (ufTATB) is presented. Axial and diametral measurements are blended to give final densities, which agree with the liquid immersion values of Baytos et al. The nominal densities at 21, −55 and 75 °C in g…