Materials Literature
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Human carbonic anhydrase II pseudo-wild type (HCAIIpwt) and two truncated variants were adsorbed to approximately 9 nm silica nanoparticles. Ellipsometry was used as an indirect measure of protein adsorption. The structural changes of adsorbed proteins were investigated with the use of circular dichroism (CD), intrins…
The presence of columnar defects (CDs) in NbS${\mathrm{e}}_{3}$ is shown to induce oscillations in the nonlinear charge density wave (CDW) conductivity as a function of magnetic field, when the field is oriented parallel to the axes of the defects. The period of oscillation corresponds to a change in the magnetic fiel…
The two macrocyclic ligands H2L1 and H2L2 are not very different, but their FeIIFeIII complexes are remarkably so. [L1Fe2(μ-OAc)2](ClO4) is valence-delocalized on the Mössbauer time scale over the range 1.8–364 K, whereas [L2Fe2(μ-OAc)(OAc)(H2O)](ClO4)·2H2O is valence-trapped even at room temperature. The difference i…
Abstract Die in den letzten Jahren stark vorangetriebene Entwicklung von solvatothermalen Methoden im mittleren Temperaturbereich (100–600°C) war vor allem durch das aufkommende Interesse motiviert, Festkörper mit offenen Gerüststrukturen zu entwerfen. Eine sehr vielversprechendes Anwendungsgebiet in dieser Hinsicht i…
Here we propose and analyze the behavior of a field effect transistor (FET)-like switching device, the Mott transition field effect transistor, operating on a novel principle, the Mott metal-insulator transition. The device has FET-like characteristics with a low “ON” impedance and high “OFF” impedance. Function of th…
We have studied the thermal oxidation of free-standing porous silicon films from room temperature to 730 °C with a differential scanning calorimeter and a thermogravimeter. We have observed three different thermal oxidation processes for the porous silicon. The change of enthalpy (ΔH) and activation energy (Ea) for th…
The crystal structure of cadmium mercury thiocyanate [CdHg(SCN)4] is determined by means of a four circle diffractometer. The structural features and properties of the crystal are described. Blue-violet light output by frequency doubling of a 809 nm GaAlAs laser diode using a cadmium mercury thiocyanate crystal device…
The electrical conductivity in chalcogenide glasses is found to obey the Meyer–Neldel rule,σ=σ00eΔE/EMNe−ΔE/kT. The Meyer–Neldel characteristic energy, EMN, lies in the range 25–60 meV with σ00 in the range 10−5–10−15 S cm-1 which seems to be too small for band transport. A surprising correlation between σ00and EMN is…
Unambiguous evidence for resonant photoemission in Ni is presented. Interference effects are identified at the $2p$ edges for the valence band and the 6 eV satellite. A rapid transition from a resonant Raman to an Auger-like regime shows that the core-excited states above threshold are not localized enough to signific…
By size-selective precipitation homodimeric CdSe nanocrystals could be isolated from a mixture of oligomers formed when monodisperse CdSe nanocrystals (see right) were linked by the bifunctional organic ligand, bis(acyl hydrazide). TEM images revealed a reproducible separation between CdSe particles of approximately a…
We provide the first direct observation of a $\ensuremath{\beta}\ensuremath{-}\mathrm{S}\mathrm{i}\mathrm{C}\left(100\right)\ensuremath{-}c\left(4\ifmmode\times\else\texttimes\fi{}2\right)$ surface reconstruction. The experiments are performed using high-resolution scanning tunneling microscopy (STM). Flat surfaces ha…
We have measured the equation of state for DNA solutions at different ionic strengths covering 5 orders of magnitude in DNA osmotic pressure. At high osmotic pressures the equation of state is independent of the ionic strength and is dominated by exponentially decaying hydration repulsion. At lower pressures the equat…
Divalent 4f element chemistry can now be expanded from Eu, Yb, and Sm to include Tm since a synthetic route to the first crystallographically characterizable molecular complex to TmII has been found. The intense green title complex was isolated from the reaction of TmI3 and Tm in dimethoxyethane. The photosensitive co…
We report a first-principle study of the ${E}_{1}^{\ensuremath{'}}$ defect in $\ensuremath{\alpha}$-quartz and of the analogous ${E}_{\ensuremath{\gamma}}^{\ensuremath{'}}$ defect in amorphous ${\mathrm{SiO}}_{2}$. Our calculation supports the attribution of both these defects to a positively charged oxygen vacancy. T…
The Hall coefficient of Gd-doped ${\mathrm{La}}_{2/3}{\mathrm{Ca}}_{1/3}{\mathrm{MnO}}_{3}$ exhibits Arrhenius behavior over a temperature range from ${2T}_{c}$ to ${4T}_{c}$, with an activation energy very close to $\frac{2}{3}$ that of the electrical conductivity. Although both the doping level and thermoelectric co…
[111] ordered common atom strained layer superlattices (in particular the common anion GaSb/InSb system and the common cation InAs/InSb system) are investigated using the ab initio full potential linearized augmented plane wave (FLAPW) method. We have focused our attention on the potential line-up at the two sides of…
Using density-functional theory with the local-density approximation and the generalized gradient approximation we compute the energy barriers for surface diffusion for Ag on Pt(111), Ag on one monolayer of Ag on Pt(111), and Ag on Ag(111). The diffusion barrier for Ag on Ag(111) is found to increase linearly with inc…
We briefly introduce tweed, which is found above the martensitic transition in a variety of shape-memory, high-T_c, and other materials. Based on our previous mapping of the problem onto a spin-glass model, we conjecture that the two-way shape-memory effect is due to tweed.
The effects of electron-hole interaction on the exciton energy of semiconductor quantum dots are calculated using pseudopotential wave functions. A comparison with the widely used, but never tested, effective-mass approximation (EMA) shows that the electron-hole Coulomb energy is significantly ( $\ensuremath{\sim}40%$…
The perpendicular arrangement of porphyrin units in dimer 1 is reflected in a large excitonic coupling that leads to splitting of the Soret bands and only modest spectral changes in the Q-bands. Compound 1 and the analogous trimer and tetramer are prepared by oxidative coupling of the corresponding 5,15-diarylporphyri…