Materials Literature
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Abstract The crystal structure of hydrothermally synthesized Rb-feldspar (monoclinic, space group C 2/ m , a = 8.839(2)Å, b = 13.035(2)Å, c = 7.175(2)Å, β = 116.11(1)8, V = 742.3(3)Å 3 , Z = 4) has been refined to a final R of 0.0574 for 692 independent X-ray reflections. Microprobe analyses of the Rb-feldspar suggest…
The present paper describes the morphology, chemistry and crystallography of silicide precipitates that were observed in Nb–Si and Nb–Ti–Si solid solutions. Although the stable structure of Nb3Si is tetragonal (tP32), within the bcc Nb solid solution, fine-scale Nb3Si precipitates were observed with a metastable ortho…
A polarizerless reflective guest-host LCD, which exhibits high luminance and good legibility has been fabricate by using NLC with Δ ε < 0 that is doped with nanomaterial molecules, fullerene C60, and dichroic dye molecules, where the NLCs are homeotroptically aligned without rubbing. It is considered that the doped C6…
Reaction of [Ti7O4(OEt)20] with benzoic acid results in the formation of the new cluster [Ti6O4(OEt)14(OOCPh)2] with concomitant rearrangement of the cluster structure. The molecular structure of the new cluster was determined by single-crystal X-ray diffraction and can be represented by the extended formula [Ti6(μ4-O…
A new type of photo-crosslinkable methacrylate polymer liquid crystal (PLC) with a coumarincontaining mesogenic side group was synthesized and applied as the photoalignment layer for low molecular mass nematic liquid crystals. Linearly polarized ultraviolet light was directed onto a thin film of PLC under various expo…
Abstract The growth of Au clusters on TiO 2 (110)−(1 × 1) and −(1 × 2) single‐crystal surfaces and on ordered Al 2 O 3 films prepared on Re(0001) has been studied by low‐energy electron diffraction (LEED), Auger electron spectroscopy (AES), low‐energy ion scattering spectroscopy (LEISS) and high‐resolution electron en…
Abstract The main features of inelastic mechanical behavior of glassy state were studied theoretically and experimentally in terms of tensile stress‐strain and tensile creep experiments. A theoretical treatment introduced in earlier work, which takes into account the viscoelastic path at small strains and the viscopla…
Abstract Silver nanoclusters in poly(methyl methacrylate) (Ag/PMMA) were prepared by bulk polymerization of MMA with radical initiators (AIBN or BPO) in the presence of silver(I) trifluoroacetate, followed by a period of UV irradiation. It was revealed that any of Ag/PMMA samples prepared by both the initiators shows…
Direct precipitation of nanometer‐sized particles of ceria–zirconia (CeO 2 –ZrO 2 ) solid solutions with cubic and tetragonal structures was successfully attained from acidic aqueous solutions of cerium(III) nitrate (Ce(NO 3 ) 3 ) and zirconium oxychloride (ZrOCl 2 ) through the addition of ammonium peroxodisulfate ((…
1,7-Diaminoheptane (DAH) had been covalently grafted on glassy carbon electrode by amino cation radical formation, which resulted in a stable cationic monolayer under proper pH conditions. Dawson-type tungstodiphosphate anion, P2W18O626– and small molecule, Ru(NH3)63+ were alternately assembled on the DAH modified ele…
Abstract The Raman spectra of both low‐ and high‐defect kaolinites in the hydroxyl stretching and low‐wavenumber region were obtained with excitation at three visible wavelengths of 633, 514 and 442 nm and a UV wavelength of 325 nm. The UV‐excited spectra were comparable to those excited by the visible wavelengths. Th…
Traditionally, studies on soil organic matter (SOM) begin with the extraction of SOM from soils, its fractionation into humic acid, fulvic acid, and humin, followed by de-ashing of each fraction. These are tedious, laborious and inefficient procedures that do not provide any chemical information on these materials. In…
Conductivity and Hall experiments are performed on hydrogenated poly-CVD, atomically flat homoepitaxially grown Ib and natural type IIa diamond layers in the regime 0.34 to 400 K. For all experiments hole transport is detected with sheet resistivities at room temperature in the range 104 to 105 Ω/□. We introduce a tra…
Hydrogen distribution in multipass submerged arc weld metal has been measured and analysed. The measurement of initial hydrogen content in a molten pool by obtaining samples directly from the pool shows that the effect of dilution on the initial hydrogen content can be neglected. The transient hydrogen distribution in…
We report a detailed study of the exchange interactions in the neutral Mn acceptor, A0, and excitons bound to Mn acceptors, A0X, in bulk GaAs. By means of spin-flip Raman scattering we measured the constant of antiferromagnetic exchange interaction between valence band holes and electrons in the inner Mn shell, deform…
Shows how observations (1993‐1999) and on‐site and laboratory measurements (1993‐1996) have made it possible to define certain prevalent parameters concerning AC corrosion risks. These are from the evaluation and prevention of AC corrosion risks as practised by Gaz de France.
Chitin was extracted from locally collected shrimp shells. Chitosan was produced by alkali deacetylation of chitin. Poly(DEAEMA)‐chitosan‐graft‐copolymer, poly(COOH)‐chitosan‐graft‐copolymer, poly(V‐OH)‐chitosan‐graft‐copolymer, and carboxymethyl‐chitosan were prepared. The extent of the preparation reactions was expr…
A phase diagram in the parameter space of temperature and blend composition that contains order−disorder transition (ODT) and thermoreversible macrophase separation between constituent copolymers was constructed for binary blends of polystyrene- block -polyisoprene (PS−PI) copolymers. The constituent copolymers, desig…
Abstract Raman scattering investigations on triphenyl phosphite, performed in both the low‐ and high‐wavenumber ranges, provide a detailed description of the glacial state. The latter can be described as a two‐phase (amorphous–nanocrystalline) system if it is prepared by isothermal aging in the 210–222 K temperature r…
Nanocrystalline two-phase NdFeB+α-Fe material was prepared by milling techniques and subsequent heat treatment. These isotropic exchange-coupled powders show excellent hard magnetic properties with enhanced remanences up to 1.20 T and energy densities (BH)max around 150 kJ/m3. The performance is based on (i) the use o…