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。
A number of new chiral binaphthol (BN) derivatives with different substituents R,R′ in the 6,6′-positions in open (BN-diethylethers) and bridged forms (BN-acetals) have been synthesized. The syntheses of the chiral 6,6′-disubstituted-2,2′-diethoxy-1,1′-binaphthyls (R,R′ = -CH'CHCHO, -CH'CH-(p-BrPh), -CH'CH-(p-CHOPh))…
Abstract Several macromonomers were prepared by cationic ring‐opening polymerization of 2‐nonyl‐ and 2‐phenyl‐2‐oxazoline using different techniques of functionalization. Introduction of the unsaturated functional group directly via a suitable termination agent proved to be superior to the use of a phenol‐functionaliz…
Shaping zeolites into useful forms is very important for technical applications in areas such as catalysis, separation, and sensing. Normally it is difficult to form zeolites into appropriate shapes without mixing them with binders. Here, a method is presented for transforming preformed layered silicates into silicali…
Abstract The mineralogy, crystallochemistry and microfabric of clay minerals from acidic soils were studied using transmission electron microscopy (TEM) and analytical electron microscopy (AEM). Soil profiles, developed on saprolites, sampled in the main crystalline massifs of France represent different pedological en…
Electroactive organic molecular gels based on the title compound (see Figure) are reported along with their sol‐gel behavior and ionic conductivities, and their application as electrochromic materials is discussed. Furthermore the correlation between molecular structure and gel formation is examined in order to provid…
The dynamics of proton and deuteron glasses has been studied via the NMR spin-lattice relaxation (${T}_{1}$) of $^{87}\mathrm{Rb}$ and O-D\ifmmode\cdot\else\textperiodcentered\fi{}\ifmmode\cdot\else\textperiodcentered\fi{}\ifmmode\cdot\else\textperiodcentered\fi{}O deuterons down to $T=1.6$ K in ${\mathrm{Rb}}_{0.50}$…
Spectral and decay properties of the photoluminescence (PL) emission in the range 3.5-5.0 eV are investigated in various types of silica ($a$-Si${\mathrm{O}}_{2}$), as grown and after $\ensuremath{\gamma}$ irradiation. We report experimental results on the ultraviolet (5.0 eV) absorption, on the emission and excitatio…
The fluid-solid equilibrium of a system made of charged hard spheres with positive and negative ions of the same size is considered. At high temperatures freezing occurs in a substitutionally disordered close packed structure, the face centered cubic solid (fcc). At low temperatures freezing occurs in the ordered cesi…
The luminescence intensity of trivalent lanthanides, especially terbium(III) and europium(III), is shown to be enhanced by coordination with the ligand 2,6-pyridinedicarboxylic acid (DPA). Further enhancement can be obtained by forming a columinescent complex aggregate with ions such as gadolinium(III), terbium(III),…
Abstract Modern solid state nuclear magnetic resonance (NMR) techniques afford powerful experimental strategies for elucidating detailed structural information in noncrystalline materials. While previous research emphasis has been on the identification and quantification of local environments (short‐range‐order), prim…
The growth, microstructure, and electrochemical oxygen intercalation of c-axis ${\mathrm{La}}_{2}$${\mathrm{CuO}}_{4+\mathrm{\ensuremath{\delta}}}$ thin films on substrates with different lattice mismatch [${\mathrm{SrTiO}}_{3}$ (001) and ${\mathrm{SrLaAlO}}_{4}$ (001) substrates] are compared. Except for the absence…
According to theoretical predictions made in 1989–1990, carbon nitride can be even harder than diamond. Carbon nitride thin films may become a good competitor for diamondlike carbon, which possesses a high hardness, high wear resistance, and low friction coefficient. At present, there are only a few studies on the tri…
Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Twitter Facebook Reddit LinkedIn Tools Icon Tools Reprints and Permissions Cite Icon Cite Search Site Citation F. Beekmans, A. D. Gotsis, B. Norder; Transient and steady‐state rheological behavior of the ther…
Human fibroblasts cultured for 10 days in a collagen sponge migrated through the pores of the sponge and expressed a moderate mitotic activity, which stabilized after 10 days, and a high collagen and protein synthesis. Between 10 and 27 days, the newly synthesized collagen filled the pores of the sponge. This matrix a…
Carbon nitride thin films prepared by radio frequency reactive sputtering of graphite in pure nitrogen plasma have been characterized by x-ray photoelectron spectroscopy (XPS) for probing the chemical bonding in the films. The multiple binding energy values obtained for the C 1s and N 1s photoelectrons in the film sug…
The machining and subsequent annealing behavior of an Al 2 O 3 ‐SiC nanocomposite (A1 2 O 3 + 5 vol% 0.2 μm SiC particles) was compared to that of single‐phase A1 2 O 3 . The machining‐induced residual line force was determined by measuring the extent of elastic bending in thin disk specimens, and the surface roughnes…
The microstructures and age hardening behaviours of a series of Mg–Al–rare earth (RE) alloys that had been either pressure die cast or permanent mould cast were investigated by SEM and analytical TEM. Two types of phases, Al4MM and Al12Mg17, were found in the as cast alloys and no pseudoternary Mg–Al–RE phases were pr…
We have observed multiple electronic states in the presence of a magnetic field in the half-doped ${\mathrm{La}}_{0.5}{\mathrm{Ca}}_{0.5}\mathrm{Mn}{\mathrm{O}}_{3+\ensuremath{\delta}}$ system. The resistivity of each state differs from one another by at least one order of magnitude. Application of a magnetic field in…
By chemical liquid deposition in which an alkoxide with a carbon number of 4 or smaller was used as raw material, a Sr 0.7 Bi 2.3 Ta 2 O 9+α (SBTO) thin film was fabricated for use as a ferroelectric memory device for the purpose of decreasing the temperature of crystallization and improving surface morphology. The cr…
Abstract Individual but connected synthetic routes for the preparation of the all‐E ‐configured 2,5‐dipropoxy‐substituted oligo(1,4‐phenyleneethenylene)s 1a–g were developed. An increasing number of conjugated stilbene units from n = 1 to n = 11 led to a convergent bathochromic shift (Δλ = λ ∞ − λ 1 = 127 nm) in the U…