Materials Literature
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The tribological characteristics of a diamondlike carbon (DLC) film deposited on high‐speed steel were investigated systematically by using a ball‐on‐flat reciprocating tribometer over a range of temperatures (from −40° to 20°C). The results indicated that the temperature dependence of the DLC film's tribological beha…
There is an ongoing interest on the photoluminescence (PL) and related properties of doped nano ZnS since there is a large change in their PL properties with particle size reduction. Such PL properties are theoretically predicted to be much enhanced with ZnS particle sizes below the Bohr radius, i.e., in ZnS for parti…
Abstract Iron oxides, oxyhydroxydes and oxycarbonates derived from the layered Ruddlesden‐Popper (RP) structure form a large family of layered compounds. Besides the classical RP oxides Sr n+1 Fe n O 3n+1 , single intergrowths with the generic formulation (A,Sr) n+2 Fe n O 3n+2 and (A,Sr) n+3 Fe n O 3n+3 (A = Tl, Pb,…
Abstract Crystal structures of R 3 CuSnS 7 (R = La–Nd, Sm, Gd–Ho) (La 3 CuSiS 7 structure type, space group P 6 3 , Pearson symbol hP24 ) were determined by means of X‐ray single crystal diffraction ( a = 1.0317(1) nm, c = 0.60274(7) nm, R 1 = 0.0202 for La 3 CuSnS 7 ; a = 1.0209(1) nm, c = 0.60150(7) nm, R 1 = 0.0273…
Rare-earth ion (Ce3+, Tb3+) doped LaPO4 nanoparticles were prepared by the polyol method and characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), UV-vis absorption spectroscopy, photoluminescence (PL) spectroscopy, and lifetimes. The results of XRD indicate that the as-prepar…
Hydrothermal reaction of the mixed thiolate-carboxylate-aromatic amine ligand, 6-mercaptonicotinic acid (6-mnaH2) with Co(II) and Ni(II) leads to two network coordination solids [M9(6-mna)8(mu3-O)2(OH3)2(OH2)6] (M = Co, Ni), 1, and [M2Ni12(6-mna)12(mu3-OH)2(OH2)6] x 8H2O (M = K, Rb, Cs), 2. These compounds are unusual…
Abstract A natural fiber hybrid composite containing equal proportions of kenaf fibers (KFs) and wood flour (WF) as the reinforcements and polypropylene (PP) as the polymer matrix was prepared, and its static and dynamic mechanical properties were compared with KF/PP and WF/PP composites. Static tensile and flexural t…
The present contribution reports the unlubricated friction and wear properties of Ti 3 SiC 2 against steel. The fretting experiments were performed under varying load (1–10 N) and the detailed wear mechanism is studied using SEM‐EDS, Raman spectroscopy, and atomic force microscopy. Under the selected fretting conditio…
The knowledge of the inelastic double differential scattering cross section (DDSCS) is of utmost importance for microanalysis in electron energy loss spectrometry (EELS) in the electron microscope and for the investigation of electron energy loss near edge structure (ELNES). Calculations are usually based on a nonrela…
Abstract Water‐soluble, electrically conductive polyaniline (PANI)–poly(vinyl alcohol) (PVA) blends of different compositions (10, 30, 50, and 70 w/w) were synthesized by emulsion and inverted emulsion methods with ammonium persulfate and benzoyl peroxide as the oxidants, respectively, with PANI protonated with sulfos…
Abstract The strain‐induced crystallization of natural rubber (NR) was investigated by the measurement of the tear energy of a crosslinked blend consisting of NR and noncrystalline styrene–butadiene rubber (SBR). When NR was dispersed into the SBR matrix, the tear energy of SBR increased at various temperatures and te…
The influence of Co2+ ions on the homogeneous nucleation of ZnO is examined. Using electronic absorption spectroscopy as a dopant-specific in-situ spectroscopic probe, Co2+ ions are found to be quantitatively excluded from the ZnO critical nuclei but incorporated nearly statistically in the subsequent growth layers, r…
Phthalocyanine−perylene derivative blends present a homogeneous columnar hexagonal mesophase in a wide temperature range. This mesophase is highly stabilized and ordered compared to the one of pure phthalocyanine.
The origin of the insulating ground states and the charge disproportionation in the two Fe-based perovskite oxides, viz., $\mathrm{Ca}\mathrm{Fe}{\mathrm{O}}_{3}$ and ${\mathrm{La}}_{1∕3}{\mathrm{Sr}}_{2∕3}\mathrm{Fe}{\mathrm{O}}_{3}$, are examined from ab initio electronic structure calculations based on the density-…
Aluminum titanate (Al 2 TiO 5 ) is a promising engineering material because of its low thermal expansion coefficient, excellent thermal shock resistance, good refractoriness, and nonwetting with most metals. However, it is susceptible to thermal dissociation in the temperature range of 800°–1280°C, which degrades its…
We report on a new synthetic method for mesoporous titania/silica (MTS), which is framed by titania-coated silica nanospheres. The MTS has extremely high thermal stability (stable up to 1000 °C), a high surface area (690−480 m 2 /g), a high pore volume (0.65−2.16 cm 3 /g), and a narrow pore size distribution. The anat…
Layered thin films composed of avidin and 2-iminobiotin-labeled poly(ethyleneimine) (ib-PEI) were prepared by a layer-by-layer deposition of avidin and ib-PEI on a solid surface, and the disintegration induced by changing environmental pH and adding biotin in the solution was studied. The avidin/ib-PEI layered film co…
Diarylethene derivatives having imino nitroxide and nitronyl nitroxide have been prepared to examine the effect of the radical substituents on the photochromic reactivity of 1,2-bis(2-methyl-1-benzothiophen-3-yl)perfluorocyclopentene. These radical substituents reduce the quantum yields of both cyclization and cyclore…
A photoinduced transition in an azobenzene-containing liquid crystal leads to a phase that does not exist in the thermal cycle. The smectic A phase is induced and stabilized only in the presence of UV light, producing fan-shaped focal conic textures typical of the SmA phase, as observed by polarized-light microscopy (…
Abstract A series of water‐based polyurethane dispersions were synthesized by the polyaddition of isophorone diisocyanate, poly(oxytetramethylene) glycol, and dimethylol propionic acid as prepolymers, which were end‐capped and crosslinked with 3‐aminopropyl trimethoxysilane (APTMS) to produce silylated polyurethane di…