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。
Abstract Design and dimensioning of manufacturing processes based on filling molds with polyurethane foams still require the use of highly empirical approaches. This includes numerous experimental runs with expensive prototypes. Therefore, a method has to be found to analyze the molding process at an early stage of pr…
The theory of the acoustics of dilute bubbly liquids is reviewed, and the dispersion relation is modified by including the effect of liquid compressibility on the natural frequency of the bubbles. The modified theory is shown to more accurately predict the trend in measured attenuation of ultrasonic waves. The model l…
Matching matters when building supramolecular n/p-heterojunction photosystems on solid supports that excel with efficient photocurrent generation, important critical thickness, smooth surfaces, and flawless responsiveness to functional probes for the existence of operational intra- and interlayer recognition motifs.
Chiral polycatenar 1H-pyrazoles self-assemble to form columnar mesophases that are stable at room temperature. X-ray diffraction and CD studies in the mesophase indicate a supramolecular helical organization consisting of stacked H-bonded dimers. The liquid-crystalline compounds reported are 3,5-bis(dialkoxyphenyl)-1H…
Both lipase PS and Novozym 435 promote the ring-opening polymerization of lacOCA, the O-carboxylic anhydride derived from lactic acid. Accordingly, PLA of relatively high molecular weights (M(n) up to 38400 g/mol) and low polydispersities (M(w)/M(n) < 1.4) are obtained in high yields within a few hours at 80 degrees C…
In this paper we analyse the electronic properties of Dirac electrons in finite-size ribbons and in circular and hexagonal quantum dots. We show that due to the formation of sub-bands in the ribbons it is possible to spatially localize some of the electronic modes using a p-n-p junction. We also show that scattering o…
Hydrogen release: A novel catalyst based on a MOF (metal–organic framework, see figure) exhibits unexpectedly high catalytic activity for hydrogen generation from aqueous NH3BH3 solution. The H2 release was complete within 5 min (NH3BH3, 0.32 m) at 298 K in air. This work presents a new strategy for a highly efficient…
Abstract Titanium‐silica catalysts have been prepared by supporting titanium(IV) precursors with different nuclearity {mononuclear titanocene dichloride Ti(Cp) 2 Cl 2 , dinuclear titanium diethyl tartrate and the tetranuclear titanium peroxo complex (NH 4 ) 8 [Ti 4 (C 6 H 4 O 7 ) 4 (O 2 ) 4 ]⋅8 H 2 O} onto the surface…
We demonstrate near-infrared electroluminescence from ambipolar, electrolyte-gated arrays of highly aligned single-walled carbon nanotubes (SWNT). Using electrolytes instead of traditional oxide dielectrics in carbon nanotube field-effect transistors (FET) facilitates injection and accumulation of high densities of ho…
Barbarian aggregates: A barbituric acid-functionalized quarterthiophene self-aggregates in aliphatic solvents to form nanorods. Upon addition of a bismelamine receptor, the nanorods are converted into nanotapes, which can be thermally reconverted to nanorods. Nanorods and nanotapes self-organize into hexagonal columna…
Electrospun starch acetate (SA) nanofibers with different degrees of substitution (DS) have been developed using formic acid/water as solvents, and their properties and potential applications in drug delivery have been studied. Although SA is biodegradable, biocompatible, and inexpensive, the mechanical properties and…
I see UC UV! Gd3+/Tm3+/Yb3+- and Ce3+/Tm3+/Yb3+-doped LiYF4 nanocrystals are capable of generating UV, visible, and NIR upconversion (UC) emissions following λ=980 nm excitation (see figure). Gd3+ and Ce3+ can be sensitized by the Tm3+ ion, which results in UV upconversion in the region of λ=280–340 nm, making them at…
The 270-nm optical-absorption band is seen in a wide variety of diamonds but there are conflicting opinions about its relationship with the common substitutional nitrogen center. Here we use density-functional theory to show that in addition to a deep donor level, substitutional nitrogen has an acceptor level lying in…
A convenient two-step protocol is presented for synthesis of linear-hyperbranched diblock copolymers consisting of a linear, organometallic poly(ferrocenylsilane) (PFS) block and hyperbranched poly(carbosilane) (hbPCS) segments. Linear PFS diblock copolymers were synthesized through photolytic ring-opening polymerizat…
We report that the pressure-temperature phase diagram of single-crystalline SrFe$_2$As$_2$ is easily affected by the hydrostaticity of a pressure-transmitting medium. For all of the three mediums we used, superconductivity with zero resistance appears, accompanied by the suppression of an antiferromagnetic (orthorhomb…
Abstract Copper oxide thin films were obtained by annealing (temperature ranging between 100 and 450 °C) the metallic Cu films deposited on glass substrates by e‐beam evaporation. XRD studies confirmed that the cubic Cu phase of the as‐deposited films changes into single cubic Cu 2 O phase and single monoclinic CuO ph…
Nanosilver on a string: Crystalline silver polyoxovanadate supramolecular architectures are employed as precursors for the synthesis of composite nanowires (see scheme). The nanostructures are composed of semiconducting vanadium oxide which forms wires with high aspect ratios, and are embedded with metallic silver nan…
A variety of measurements using a differential scanning calorimeter were used to probe how single-walled carbon nanotubes (SWCNTs) affect polymer dynamics associated with the glass transition. Tubes were dispersed in N, N -dimethylformamide containing dissolved polystyrene, and precipitation was quickly forced by the…
Abstract Mechanical properties and glass transitions of cross‐linked polymer networks depend strongly on both the network topology and cross‐linking density. A model is developed using a dynamic cross‐linking approach based on a cutoff distance criterion followed by a high‐temperature annealing procedure. The analysis…
ADVERTISEMENT RETURN TO ISSUECommunication to the...Communication to the EditorNEXTOne-Step Synthesis of Donor−Acceptor type Conjugated Polymers from Ferrocene-Containing Poly(aryleneethynylene)sTsuyoshi Michinobu*†‡, Hiroe Kumazawa§, Keiichi Noguchi§, and Kiyotaka Shigehara§View Author Information† Global Edge Instit…