Materials Literature
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ZnO nanoparticles of about 30−60 Å size in ethanolic solution were etched by addition of anhydrous acetic acid. Upon dissolution, the volume-weighted particle size decreased by about 10%. The polydispersity increased slightly. The dissolution rate was strongly dependent on particle size, and size selective etching of…
This review summarizes recent work in nanostructured insulating materials that contain optically active lanthanide ions. These materials find applications in lasers, optical amplifiers, and optical-display phosphors. This review concentrates on the synthesis and luminescence spectroscopy of lanthanide-containing nanos…
To verify our model for the local-mode-coupled low-energy excitation of the oxygen in silicon [H. Yamada-Kaneta, C. Kaneta, and T. Ogawa, Phys. Rev. B 42, 9650 (1990)], we have performed high-resolution far-infrared absorption measurements for the oxygen lines at 29.3, 37.7, 43.3, and 48.6 ${\mathrm{cm}}^{\mathrm{\ens…
The crystal structures of the title compounds, [Ce(C5H7O2)3(C12H8N2)], (1), and [Pr(C5H7O2)3(C12H8N2)], (2), have been determined. There are two independent molecules in the asymmetric unit of (1) but only one molecule in the asymmetric unit of (2). In both compounds the metal atom is eightfold coordinated by six O an…
Single crystals of V6O13 were grown by chemical vapour transport (CVT) and subsequently electrochemically lithiated. The title compound, trilithium hexavanadium tridecaoxide, was the phase formed during electrochemical lithiation at 2.45 V versus Li/Li+. The Li3V6O13 structure comprises single and double layers of VO6…
Biaxial stress in diamond film deposited on titanium coated copper substrate is investigated. Raman spectra show that with an increase in the film thickness, the diamond Raman line shifts from higher wave numbers to lower, approaching 1332 cm−1. Fitting the experimental plot of the in-plane stress σx versus the film t…
The structure and magnetic properties of the rf-sputtered Fe/Ti multilayers with the fixed Ti-layer thicknesses (series 1: tTi=1 nm and series 2: tTi=2 nm) and the variable Fe-layer thicknesses (1 nm⩽tFe⩽6 nm) have been studied by the high-angle x-ray diffraction, transmission electron microscopy, conversion electron…
The current transport mechanism through porous silicon (PS) films fabricated from 8 to 12 Ω cm p-type silicon (p-Si) substrates has been investigated using current–voltage I(V) measurements on metal/PS/p-Si/metal devices in the temperature range of 77–300 K. The characteristics for all devices show a rectifying behavi…
The reaction between BCl 3 and NH 3 to produce dichloroboramine (Cl 2 BNH 2 ) and HCl was probed using a flow-tube reactor interfaced to a molecular-beam mass-sampling system. A composite method that couples the detailed simulation of the fluid mechanics and chemical reactions occurring in the flow tube to an algorith…
The design of a controlled environment electron microscope is described and examples are presented to demonstrate the information that can be obtained by studying gas-solid interactions in real time and at high spatial resolution. Miscrosc. Res. Tech. 42:260–269, 1998. © 1998 Wiley-Liss, Inc.
Three types of novel N-[4-(N′-substituted aminocarbonyl)phenyl] maleimide (RPhMI: N-substituent (R) = phenyl, cyclohexyl, and cyclododecyl) were synthesized and homopolymerized under several conditions. In the copolymerizations of RPhMI (M1) with styrene (ST; M2) or methyl methacrylate (MMA; M2), monomer reactivity ra…
We report a combined study using an ultrasonic shear wave reflection technique and conventional low-frequency rheology for the investigation of the crystallization kinetics and melting of a poly(ethylene oxide) (PEO) homopolymer and a poly(ethylene oxide)−polystyrene−poly(ethylene oxide) (PEO−PS−PEO) triblock copolyme…
We here present an analysis of valence distributions and Peierls-type distortions in one-dimensional halogen-bridged chains MMX. In those systems which result from the linking of metal dimers, the phenomenological chain and cluster models show that Peierls distortions can be associated with internal degrees of freedom…
We report our studies of magnetic-domain structure in Nd2Fe14B permanent magnets using advanced transmission and scanning electron microscopy, including Lorentz imaging and electron holography. Domain-wall spacing D was measured as a function of thickness t for thin crystals, and also wall width of 90° and 180° domain…
The glass transition can be measured at different experimental conditions. Using spectroscopic methods at relative high frequency the α-relaxation is measured in the thermodynamic equilibrium. In the caloric case we call this phenomenon thermal relaxation transition (TRT). With a conventional differential scanning cal…
During spherulitic crystallization of polymers, there is a tendency for low molecular weight and other less crystallizable entities to be rejected from the body of the spherulites. This rejection process causes a segregation of these species to those areas where spherulites impinge. As a result of this segregation, la…
Transport properties of polyaniline (PANI)--cellulose acetate (CA) conducting blends have been investigated at various length scales and temperatures. We report on the results of dc and ac conductivity measurements, magnetoresistance and electron-spin resonance (ESR) performed on composite films with PANI weight fract…
The influence of ion bombardment on the nucleation and growth of diamond films by microwave plasma chemical vapor deposition (CVD) has been investigated. The following findings were obtained. (i) Modification of surface diffusion by a substrate bias voltage was demonstrated by the measurement of the first-nearest-neig…
The first part of a series of two, this paper analyzes the degradation of pure and filled PTFE under high energy UV radiation. The polymer morphology is first investigated using differential scanning calorimetry, highlighting the respective nucleating efficiency of TiO2 and CaF2 during polymer crystallization. Then, t…
Polypyrrole films containing perchlorate were electrochemically synthesized and the bending and recovery motion of the films obtained has been investigated. It was found that the thickness of the film and ambient relative humidity (RH) were crucial to the motion of film: An increase of the film thickness decreased the…