Materials Literature
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A new type of surfactant with a hydrophile of dendritic polyethylenimine (C(12)(EI)(7)) was synthesized by a cationic polymerization of dodecylamine with aziridine and was used as a stabilizer to prepare Pt colloid, which is then used in situ to prepare carbon-supported Pt nanoparticles. The effects of supporting carb…
Single crystalline ZnO nanorods were prepared by the hydrothermal method with synthesized ZnCl2·4Zn(OH)2 as the precursor. Morphologies of the nanorods were controlled by various reaction conditions with cetyltrimethylammonium bromide (CTAB) as the modifying agent. The nanorods were characterized by XRD, TEM, UV-Vis s…
A model for the modulated crystal structure of an antigorite polysome with m = 16 (where m is related to the number of tetrahedra spanning a wavelength along a) was refined by single-crystal synchrotron diffraction data in C2/m, using crystals coexisting with the m = 17 polysome from Val Malenco, Italy, which was prev…
The incorporation of the electronegative cyano group into the structure of the title dithiazolyl radical 1 induces a lamellar packing motif that favors spin-transition behavior. Variable-temperature magnetic studies on 1 reveal a reversible phase transition at 250 K between a diamagnetic low-temperature phase and a pa…
The unit cell parameters a and c of nonirradiated [N(C 2 H 5 ) 4 ] 2 ZnBr 4 crystals in the temperature region 90–300 K and of samples irradiated with γ rays to doses of 10 6 and 5 × 10 6 R in the 270-to 300-K interval were measured using x-ray diffraction. The data obtained were used to derive the thermal expansion c…
ø200 mm silicon single crystals were grown in the ø450 mm hot zone of a Czochralski (CZ) furnace. By modifying the pattern and the velocity of the argon flow, the silicon single crystals with different oxygen concentrations were obtained. Through numerical simulation, the velocity of the argon gas flow was plotted for…
Epiclon, 5‐(2,5‐dioxotetrahydrofurfuryl)‐3‐methyl‐3‐cyclohexenyl‐1,2‐dicarboxylic acid anhydride, reacted with p‐aminobenzoic acid to give a dicarboxylic acid containing imide rings. This was further treated with thionyl chloride to give the corresponding diacid chloride having epiclon units and imide rings. New poly(…
Abstract In this paper thermal and thermo‐oxidative stability of nylon 6 based nanocomposites containing up to 5% by weight of fatty acid coated calcium carbonate (CaCO 3 ) nanoparticles is studied. Thermal stability of compression‐moulded samples was evaluated by thermogravimetric analysis (TG) under air and nitrogen…
The IEC 60093 Standard, prepared by the International Electrotechnical Commission in 1980, sets up methods of measurements, determination and calculation of volume and surface resistivities of solid dielectrics. The document contains some editorial mistakes as well as content-related inaccuracies that require revision…
Allanite-(La) is a member of the epidote group. It was sampled at Buca della Vena mine, near Stazzema, Apuan Alps, Tuscany, Italy. It occurs as prismatic crystals up to 2–3 mm in length along [010] within barite veins cutting a dolomitic metamorphosed limestone. The mineral is black with brownish refl ections, a brown…
Viscometric measurements, in toluene solution at 30 ºC, were performed with high-cis polybutadiene synthesized by neodymium based catalyst. Six different equations were used to calculate intrinsic viscosities and viscosimetric constant values: Huggins, Kraemer, Martin and Schulz-Blaschke by graphic extrapolation, and…
A 0.1–0.15-eV displacement of the fundamental absorption edge in the optical absorption spectra of nanocrystalline oxide n -CuO (relative to the position of the fundamental absorption edge in the spectra of CuO single crystals) towards lower energies (red shift) is observed against the background of strong blurring. N…
Systematic series of lead-bismuth borate glasses, where PbO, Bi2O3 and B2O3 content change for every series based on their weight percentage have been prepared. The ultrasonic and glass transition temperature (Tg) of this glass system have been studied using the Matec MBS-8000 Digital Signal Processing and conventiona…
Despite variation in their protoplast organization and wall structure, monoraphid diatoms have traditionally been grouped as a single family or order, intermediate between the araphid and biraphid diatoms. However, the predominantly marine or brackish species of Achnanthes sensu stricto share protoplast and frustule f…
The effects of the degree of silicate surface modification by organic surfactants and the nature of surfactant−matrix enthalpic interactions on polymer-layered silicate nanocomposite (PLSN) morphology have been systematically investigated. Using cation exchange to modify montmorillonite, a series of “partially” modifi…
Two tripodal, hexadentate pyrone-based chelators have been prepared. These ligands form stable, soluble complexes with gadolinium(III). The complexes show aqueous stability comparable to that of [Gd(DTPA)]2- at pH 7.4. Evaluation by relaxometry shows that these complexes have two inner-sphere water molecules and a ver…
We consider a chain of coupled and strongly pinned anharmonic oscillators subject to a non-equilibrium random forcing. Assuming that the stationary state is approximately Gaussian, we first derive a stationary Boltzmann equation. By localizing the involved resonances and identifying the umklapp processes, we next inve…
Hemp strands as natural lignocellulosic fibers are used to reinforce polypropylene composites obtained by injection molding. The aim of this work is to improve the final mechanical properties using simple and cheap treatments. Therefore, a refining process is applied to increase the specific surface and the fibrillati…
Yttria‐stabilized zirconia (YSZ) hollow fiber membranes have been developed by a combined phase inversion and sintering method. An organic binder solution (dope) containing suspended YSZ particles is spun to form a hollow fiber precursor, which is then sintered at elevated temperatures. The prepared hollow fibers have…
A new concept of a passive matrix ferroelectric liquid crystal display (FLCD) with a memorized gray scale is proposed. The physical origin of the gray scale in ferroelectric liquid crystal displays is considered. The criterion of reliable bistability is derived depending on the FLC hysteretic behavior in an electric f…