Materials Literature
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The biological activity of some proteins is known to be sensitive to oxidative damage caused by a variety of oxidants. The model protein staphylococcal nuclease was used to explore the effect on protein structural stability of oxidizing methionine to the sulfoxide form. These effects were compared with the effects of…
The temperature dependence of the viscosity and stress‐relaxation kinetics of sol–gel‐derived SiOC glasses that contain up to 14 at.% carbon have been characterized in the temperature range of 1000°–1400°C. The viscosity, as determined from relaxation experiments, is in good agreement with the creep viscosity and is t…
The equilibrium core structure of isolated (a/2)〈111〉 screw dislocations are calculated using a first-principles pseudopotential plane-wave method within the local-density approximation of density functional theory, The long-range strain field of the dislocation is treated using a variation of the recently developed l…
Ultraviolet photoelectron spectroscopy was performed on phthalocyanine samples in the gas phase and as thin vapor-deposited solid films. The results are compared to those of molecular orbital calculations and electrochemical redox experiments in solutions and as solid films. Electron-withdrawing groups or substituents…
Diamond field effect transistors have operated in electrolyte solution for the first time. Since the hydrogen-terminated diamond surfaces are stable enough for the use as an electrochemical electrode, the diamond surface channels are exposed to the electrolyte in the transistor structure. A perfect pinch-off and satur…
Two new methods that substantially ease the processing and study of refractory metals, when an electrostatic levitation furnace is used, are reported. The first technique is concerned with preheating the sample on a pedestal, prior to launch, to a temperature (∼1500 K) at which thermionic emission dominates all other…
A critical review is presented of recent experimental and theoretical work on the steady sedimentation of particulate suspensions in viscous fluids. The point of view is that of a practitioner of non-equilibrium statistical physics rather than classical fluid mechanics.
The helical structure of the B 4 phase in the banana-shaped molecules, the 1,3-benzene bis[4-(4-n-alkoxyphenyliminomethyl) benzoate] (P- n -O-PIMB) series, has been studied by means of optical microscopy, X-ray diffraction and circular dichroism for homogeneously and homeotropically aligned cells. The homogeneously al…
Single-dot microscopy has been employed to unravel the electronic interactions between nanoscopic surfaces and adsorbed molecules. It is illustrated that the blinking effect of single nanocrystals changes in the presence of oxygen. The influence of the surrounding atmosphere as well as illumination on the fluorescence…
The rapid increase in the development of medical devices using nearly equiatomic Ni–Ti alloys (Nitinol) provides evidence of their advantages as biomaterials. Two generic properties of Nitinol, thermally induced shape recovery and superelasticity, are successfully employed for medical uses. However, several aspects of…
Nanocrystalline titanium and indium oxides and TiO 2 −In 2 O 3 composites have been prepared by sol−gel technique using concentrated hydrous titanium dioxide and indium hydroxide sols. Structure, optical, and photoelectrochemical properties of the composites with different molar ratios of TiO 2 to In 2 O 3 have been s…
Er3+-doped and Er3+/Yb3+-codoped Na2O·Ca3Al2Ge3O12 glasses that are suitable for use in optical waveguide devices have been fabricated and characterized. The density, the refractive indices, the optical absorption, the Judd–Ofelt parameters, and the spontaneous transition probabilities of the glasses have been measure…
Abstract Rubber compounds based on butadiene rubber (BR) or styrene—butadiene rubber (SBR) containing organophilic layered silicates were prepared. Organophilic silicates were swollen in a rubber/toluene solution. Matrix—filler reactive bonding was performed by adding bis(triethoxysilylpropyl)-tetrasulfan (TESPT) duri…
On short time scales, the diffusion of mobile ions in glasses is nonrandom, i.e., the ions perform correlated forward-backward motions. By using linear response theory, we show in detail how typical distances characterizing the spatial extent of the nonrandom ionic diffusion can be derived from frequency-dependent con…
With the purpose of creating ZnO-based amorphous transparent conductors, a range of amorphous films InGaoO3(ZnO)m (where m ≤ 4) was prepared using a pulsed-laser deposition method. The resulting films exhibited an optical bandgap of 2.8-3.0 eV, and an n-type electric conductivity of 170-400 Scm−1 at room temperature,…
The first time-dependent DFT study of the excited states of ZnPc is presented. The theoretical results provide an accurate description of the UV−vis and vacuum−UV spectra and prove to be in excellent agreement with gas-phase spectra and generally in line with deconvolution analyses of solution and Ar/matrix absorption…
Piezoelectric response nonlinearity is approached using the Preisach description of hysteretic systems as collection of distributed bistable units. The Preisach model and its recent physical interpretation in terms of moving domain wall in a stochastically described pinning field are reviewed. It is shown that such an…
Zircon crystals synthesized in a Li-Mo oxide melt and doped with trivalent lanthanides and Y (REE), both with and without P, were examined by single-crystal X-ray diffraction (XRD). REE are incorporated into the Zr site in the zircon structure, and some Zr appears to be displaced to the Si site. Crystals doped with mi…
Abstract This document is the first published by the IUPAC Commission on Macromolecular Nomenclature dealing specifically with liquid crystals. Because of the breadth of its scope, it has been prepared in collaboration with representatives of the International Liquid Crystal Society. The document gives definitions of…
NOESY-HSQC 3D-NMR and NOESY 2D-NMR techniques have been used on a 750 MHz spectrometer to study the chain conformations of different generation DAB dendrimers (poly[propylene imine] dendrimers) in chloroform and benzene solutions. The high-field multidimensional NMR techniques provided the chemical shift dispersion ne…