Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
Three unusual compounds based on polyoxometalate building blocks, [(C 6 H 5 NO 2 ) 2 Ln(H 2 O) 4 ] 2 [IMo 6 O 24 ][NO 3 ]·4H 2 O (Ln = Ce 1 and La 2 ) and [(H 2 O) 4 Ag 3 ][Cr(OH) 6 Mo 6 O 18 ]·3H 2 O 3, have been synthesized and characterized by elemental analysis, IR and X-ray photoelectron spectroscopy, thermogravi…
We report the grafting of polystyrene (PS) and poly( tert -butyl acrylate) (P t BA) from poly(vinylidene fluoride- co -chlorotrifluoroethylene) (P(VDF- co -CTFE)) via atom transfer radical polymerization (ATRP). The initiating sites on P(VDF- co -CTFE) for the graft copolymerization are the secondary chlorines, indica…
Ferroelectric nanoparticles of different shape and their nanocomposites are actively studied in modern physics. Because of their applications in many fields of nanotechnology, the size effects and the possible disappearance of ferroelectricity at a critical particle volume attract a growing scientific interest. In thi…
Ordered mesoporous materials show great importance in energy, environmental, and chemical engineering. The diffusion of guest species in mesoporous networks plays an important role in these applications, especially for energy storage, such as supercapacitors based on ordered mesoporous carbons (OMCs). The ion diffusio…
Poly( N -isopropylacrylamide) (PNIPAM) is perhaps the most well-known member of the class of responsive polymers. Free PNIPAM chains have a lower critical solution temperature (LCST) in water at about 30 °C. This very sharp transition (about 5 °C) is attributed to alterations in the hydrogen-bonding interactions of th…
The complexity of the Portevin-Le Chatelier effect in Al-2.5%Mg polycrystalline samples subjected to uniaxial tensile tests is quantified. Multiscale entropy analysis is carried out on the stress time series data observed during jerky flow to quantify the complexity of the distinct spatiotemporal dynamical regimes. It…
Determination of lattice misfit and microstructural parameters of the coherent precipitates in Ni based alloy Inconel-625 is a challenging problem as their peaks are completely overlapping among themselves and also with the matrix. We have used a novel X-ray diffraction technique on the bulk samples of Inconel 625 at…
We present an experimental investigation of band-gap shrinkage in n-type GaN using photoluminescence spectroscopy, as a function of electron concentration and temperature. The observed systematic shift of the band-to-band transition energy to lower energies with increasing electron concentration has been interpreted a…
Nanoscale monocrystalline starch particles were successfully modified using stearic acid chloride and poly(ethylene glycol) methyl ether. Surface modification was confirmed using FTIR, XPS spectroscopy, and contact angle measurements. X-ray diffraction and DSC analysis confirmed that there was no alteration of the sta…
A new approach was developed to detect the activity of alkaline phosphatase (ALP) enzyme at ultralow concentrations using a surface-enhanced Raman scattering (SERS) technique. The approach is based on the use of gold nanoparticles as a SERS material whereas 5-bromo-4-chloro-3-indolyl phosphate (BCIP) is used as a subs…
Röhren oder Käfige? Quantenchemische Rechnungen liefern Hinweise darauf, dass Methylaluminoxane bevorzugt als Nanoröhren mit etwa 1 nm Durchmesser vorliegen (siehe Bild). Unter den Strukturen, die diese Nanoröhren einnehmen können, ist die Zickzack-(4,0)-Variante energetisch am günstigsten.
Recently there has been considerable interest in the displacive ferroelectric phase transition near T = 28 K in O-18 isotopic strontium titanate. Special efforts have been made to combine the quantum criticality exponents α = -2 (2D) or -3 (3D), δ = 3, and γ = 2 with the thermodynamic inequalities of Rushbrooke, Griff…
Sixteen mesomorphic derivatives of the title compounds have been investigated for their phase behavior. These compounds constitute four homologous series that differ from each other by the substituent X. The latter varies between CH3O, CH3, Cl, and NO2, and the number (n) of carbons in the alkoxy chain varies, within…
The first preparation of telechelic oligopropylene with succinic anhydride units (iPP–MA) was achieved by the ene reaction of α,ω-bis(2-propenyl)oligopropylene (iPP–TVD) with maleic anhydride. A degradable polypropylene [isotactic polypropylene-block-isotactic polypropylene (iPP-b-iPP)] was prepared with iPP–MA and di…
▪ Abstract During the past decade, researchers in the field of polymer chemistry have developed a wide range of very powerful procedures for constructing ever-more-sophisticated polymers. These methods subsequently have been used in suitable systems to solve specific medical problems. This is complicated, and many key…
Despite many projections on the inevitable post-PVD evolution of interconnect technology, it remains PVD-based for liner-seed through 45 nm and perhaps farther, with an ALD process change the obvious next step perhaps followed by a switch from Ta to Ru. Cu size effects are not critical to low-level (1times) line RC an…
Abstract The aligned films, the homogeneous film, the 90°‐twisted film and the 180°‐twisted film, have been prepared by immobilizing the polymerizable liquid crystals under the UV irradiation. The relation between the thermal conductivity and the aligned molecular direction of the films was investigated. It is indicat…
Nacre or mother-of-pearl in the shell of Pinctada margaritifera is composed of 95-99% calcium carbonate and 1-5% organic matrix. In this study, we developed an original technique to characterize the genes differentially expressed in nacre-forming cells (NFC) by combining suppression subtractive hybridization (SSH), to…
Density functional theoretic studies are performed for the high-spin copper clusters (n)(+1)Cu(n) (n = 2-14), which are devoid of electron pairs shared between atoms, hence no-pair clusters (J. Phys. Chem. 1988, 92, 1352; Isr. J. Chem. 1993, 33, 455; J. Am. Chem. Soc. 1999, 121, 3165). Despite the lack of electron pai…
Abstract Quasi‐spherical Si nanocrystals with diameters from 0.8 to 1.6 nm are embedded into amorphous SiO 2 networks and further optimized using density functional methods. After relaxation the nanocrystals exhibit a smooth interface without defects to the glass matrix. Tensile strain is observed within the nanocryst…