Materials Literature
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Raman scattering measurements have been made on SiC ceramics prepared from two powdered by sintering at different temperatures. The Raman spectra of starting powders have also been measured. The volume contents of the 4H and 15R polytype phases relative to that of the 6H phase in the ceramics are inferred from the Ram…
This paper describes the relation between the flow resistance of a textile material and its geometry. A literature survey reveals that the orifice model is most suited to modeling the flow resistance of woven fabrics, but applications of this model were, until now, restricted to relatively open fabrics due to the geom…
A new series of chiral liquid crystalline materials having the same rigid core containing a keto group, and various numbers of (S)-lactate groups in the chiral segment, has been synthesized and studied. All the compounds contain a branched terminal alkyl chain derived from (S)-2-methylbutanol. The influence of the num…
The possibility of developing fine‐grained (∼0.5–3 μm) and dense (≥0.98ρ th ) alumina (90 vol%)–aluminum titanate (10 vol%) composites with improved thermal shock resistance and maintained strength is investigated. One alumina material and one composite with similar microstructures (porosity and grain‐size distributio…
The stabilities of porous silicon samples after thermal oxidation, thermal carbonization, thermal nitridation and dodecene-treatment have been compared. The stability of these samples in different temperatures and RH-atmospheres was examined by measuring the weight increase as a function of time. Also, the reactivity…
An inexpensive and compact carbon dioxide sensor based on a porous silicon (PS) film modified with 3-amino-1-propanol has been demonstrated. The modifying reaction as well as the interaction of carbon dioxide with the PS amine-terminated surface has been investigated using Fourier Transform Infrared Spectroscopy. Opti…
Analyzes the performances of closed-loop control systems when real hysteretic actuators (e.g., Terfenol-D-based devices) are of concern. Shown is a simple but effective strategy, based on the simple idea of pseudo-compensator, for transducer's hysteresis compensation. Such a strategy improves the control system's beha…
In a previous study, we reported observation of the novel inverted phase (the minority blocks comprising the continuum phase) in kinetically controlled phase separating solution-cast poly(styrene- b -butadiene- b -styrene) (SBS) triblock copolymer films [Zhang et al. Macromolecules 2000, 33, 9561−7]. In this study, we…
Ferroelectric (FE) materials display very peculiar structural, electrical, and electromechanical features. Their properties have been addressed, by means of ab initio simulations, from 1990. Since then, a great number of different contributions has greatly expanded our understanding of this important class of material…
“Reactive‐templated grain growth” (RTGG) processing of Bi 1/2 Na 1/2 TiO 3 (BNT)‐based ceramics is reported. Molten salt synthesis was used to prepare platelike (∼0.2 μm × 5 μm × 5 μm) Ruddlesden–Popper (Sr 3 Ti 2 O 7 (ST)) and Aurivillius (BaBi 2 Nb 2 O 9 (BBN)) phases which were used as “templates” in studies of RTG…
The dielectric function of nanocrystalline silicon (nc-Si) with crystallite size in the range of 1 to 3 nm has been determined by spectroscopic ellipsometry in the range of 1.5 to 5.5 eV. A Tauc–Lorentz parameterization is used to model the nc-Si optical properties. The nc-Si dielectric function can be used to analyze…
Reports on the electromagnetic wave absorption properties of amorphous alloy-ferrite-epoxy composites with various amorphous alloy fractions in the frequency range from 1 to 5 GHz. We varied the fraction of amorphous alloy in amorphous alloy-ferrite-epoxy composites from 0 to 50 vol.% at a fixed 50 vol.% fraction of e…
New meta -substituted homologous three-ring mesogens, the 4-(3-n-decyloxyphenyliminomethyl) phenyl 4-n-alkyloxybenzoates, have been synthesized, which are non-linear due only to the attachment of one of the alkyloxy groups in a meta -position. The mesophases were studied by optical microscopy, differential scanning ca…
The sensitivity of the optical reflectivity of porous silicon structures to the refractive index of liquid within the pores is studied for a single layer, a Bragg mirror and a microcavity. Sucrose solutions of concentration in the range 0.05 to 1.0% by weight are introduced into the pores within a flow cell in order t…
Abstract We report a Raman scattering investigation of CsPbCl 3 as a function of temperature in four different scattering configurations allowing us to obtain the various irreducible representations of the appropriate symmetry groups describing the substance in its successive phase transitions: cubic, tetragonal, orth…
Abstract The DepthCube™ 3D display is a solid‐state multi‐planar volumetric display system in which a DLP based high speed projector projects slices of the 3D scene onto a stack of LC scattering shutters acting as an electronically controlled projection volume. The scattering shutters are based on Polymer Stabilized C…
The corrosion products of zinc in an atmospheric environment in the presence of sodium chloride (NaCl) particles have been studied by in situ detection using Raman spectroscopy. Zinc plate with the NaCl precipitate at a density of 0.4 mg/cm2 was exposed for 3 days or longer in air with controlled relative humidity (RH…
The relation between the phase transition in the vicinity of 420 K discovered earlier and the formation of an incommensurate phase in the temperature range 410–460 K is established based on the X-ray, dielectric, and dilatometric studies of sodium niobate (NaNbO 3 ) single crystals and ceramics. It is also established…
Abstract Various substituted phenylthienyl perhydro‐ and perfluorocyclopentenes have been synthesized in order to compare their spectroscopic and photochromic properties. The difference in the electron densities of the central cyclopentene moieties in the perhydrocyclopentene and perfluorocyclopentene molecular switch…
Abstract Montmorillonite clay was organically modified by primary and quaternary ammonium salts (having C 12 -C 18 ). The modified clay was added to a solution of natural rubber in toluene at various contents. Characterization of the structure of the nanocomposites was performed by using x-ray diffraction and transmis…