Materials Literature
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A photochromic all-optical switch in telecommunication-grade fiber is fabricated by filling a fiber Bragg grating Fabry-Pérot resonator with a spiro-oxazine solution. The narrow linewidth of the resonator allows for a high sensitivity of the resonance wavelengths to the index change. The switch is controlled by low in…
Atom transfer radical polymerization has been applied for the first time to synthesize optically active, photochromic methacrylic polymers having three-arm star structure, starting from a central core of C 3 symmetry that can be used to investigate the conformational origin of chirality in this class of synthetic mate…
We report on the properties of Pb(Zr0.3Ti0.7)O3∕PbTiO3 (PZT/PT) multilayer thin films for pyroelectric infrared sensor application. The effect of various PZT and PT stacking sequences has been systematically studied. The optimal structure for pyroelectric infrared sensor application is found to be the multilayer 5PZT/…
With 35 taxa reported by Hustedt (1942a), the genus Surirella (Turpin) is one of the most taxonomically rich and important genera in the Malili Lakes, a system of five ancient lakes located on the island of Sulawesi, Indonesia. We examine in detail the taxonomy of diatoms within the genus Surirella from the Malili Lak…
Abstract The objectives of this study were to improve the dimensional stability of medium-density fibreboard (MDF) by heat treatment and to determine the effects of the treatment on the mechanical properties and vertical density profile of the panels. MDF panels were produced from untreated fibres and fibres treated a…
In this work, a photothermal-resistance technique is developed to characterize the thermophysical properties of one-dimensional micro∕nanostructures. In this technique, a periodically modulated laser beam is used to achieve noncontact heating of suspended individual wires. The temperature response of the sample is mon…
A field-emission triode based on the low-temperature (75/spl deg/C) and hydrothermally synthesized single-crystalline zinc-oxide nanowires (ZnO NWs) grown on Si substrate with a silicon dioxide (SiO/sub 2/) insulator was fabricated for the controllable field-emission device application. Field-emission measurement reve…
Abstract Three supramolecular isomers of an Fe–NCS complex and two isomers of an Fe–NCSe complex bridged by 1,2-di(4-pyridyl)ethane have been obtained. 57Fe Mössbauer spectroscopy revealed a drastic change in the QS value by changing the structure and by changing NCS to NCSe. Solid-to-solid transformation was observed…
We utilize spin-casting and ultraviolet (UV) light-induced polymerization to make organic−inorganic nanocomposite thin films. The initial mixture consists of polycaprolactone (PCL) stabilized gold nanoparticles, reactive monomer alkoxytitanium triacrylate, and photoinitiator benzophenone, dissolved in n -butyl acetate…
Reaction of Ti[N(But)Ar]3 (Ar = 3,5-C6H3Me2 or Ar' = C6H5) with CO2 at -40 degrees C produces diamagmetic Ti(III) paddlewheel complexes with long Ti-Ti separations (>3.4 Angstrom), thus excluding direct Ti-Ti bonding. 1H NMR spectroscopy shows that the compounds are diamagnetic in solution in the temperature range of…
Magnetomechanical coupling factor, piezomagnetic d-constant and magnetic permeability are reported as a function of magnetic field and applied stress for stress annealed Fe-Ga and Fe-Al alloys. Magnetic field dependences of the samples were measured as a function of the intrinsic saturation flux density (Js), lowest o…
Many utilities are focusing their efforts on developing methods to assess the condition of equipment to extend the life of existing infrastructure. In many cases, these utilities focus their efforts on extending the life of power transformers and paper-insulated lead-covered (PILC) cables because these components offe…
By means of dielectric spectroscopy, the segmental dynamics (α-relaxation) of four different polymers (poly(vinyl acetate), poly(vinyl methyl ether), poly(vinyl chloride) and poly( o -chlorostyrene)) was mea-sured over a broad range of frequencies (10 -1 −10 7 Hz), pressures (0−300 MPa), and temperatures (240−460 K).…
Conventional Cu-ultra low K (ULK) integration schemes lead to a drastic increase of the effective dielectric constant due to porous material degradation during process steps. Although a postintegration porogen removal scheme allows overcoming these issues, only spin-on dielectrics were developed to validate this appro…
When most proteins undergo oxidative damage, they yield a variety of products containing oxidative damage at a large number of sites, most of which are modified substoichiometrically. The resulting complex mixture of products is not amenable to high-resolution structural analyses. The previous methods of structural an…
Attempts to produce Zn analogues of the structural model complexes [M2(mu-O2CR)2(O2CR)2(mu-H2O)(tmen)2] (M = Ni, Co, Mn; R = CH(3), C(CH3)3, CF3) by the reaction of a series of zinc carboxylates with N,N,N',N'-tetramethylethylenediamine (tmen), resulted in the mononuclear complexes [Zn(OAc)(2)(tmen)] (1) and [Zn(crot)…
In the absence of weak boundary layers, surface energy can be an excellent indicator of the suitability of a fiber-reinforced composite surface for adhesive bonding. Mechanical surface treatments such as grit blasting are effective and commonly used to prepare composite surfaces, but the roughness introduced by these…
We have undertaken a detailed analysis of the X-ray photoelectron spectra obtained from the three polymorphs of Al 2 SiO 5 ; andalusite, sillimanite, and kyanite. Comparison of the spectra was made based on the chemical bonding and structural differences in the Al- and Si-coordination within each polymorph. The spectr…
Abstract The structure and the electrical properties of porous and dense liquid-phase sintered silicon carbide ceramics (LPS-SiC), containing yttria and alumina additives, have been studied. The electrical resistance of LPS-SiC-materials varies in a wide range. This paper is focused on the influence of porosity on the…
The Au nanoparticles have been synthesized in the presence of micellar solutions of fixed concentration (i.e. 1.4 x 10(-3) mol dm(-3)) of each poly(ethylene oxide)-poly(propylene oxide)-poly(ethylene oxide), triblock polymers (TBP), such as P103, P84, P123, and F127. The nanoparticles have also been synthesized in the…