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。
The efficient synthesis of a number of novel poly(ethylene glycol)-based branched soluble polymer supports with high loading capacities has been developed. These compounds are characterized and tested for their loading levels utilizing a number of coupling reactions.
Gleiten durch das Gitter: Molekularer Sauerstoff reagiert in einem Radikalmechanismus mit Kristallen des Chinodimethans 1 zu einem hochkristallinen alternierenden Copolymer. Die röntgenographische Untersuchung ergab, dass die einzigartige Anordnung von 1 im Kristall für die Copolymerisation entscheidend ist.
Steady-state absorption and emission as well as time-resolved fluorescence spectra of NR (nile red) and ZnP (zinc tetraphenylporphyrin) were studied in a variety of solvents. All spectra were decomposed as a sum of Gaussian bands, and the spectral shifts found were analyzed in terms of the general solvatochromic theor…
Electrical resistivity of ${\mathrm{Al}}_{82.6\ensuremath{-}x}{\mathrm{Re}}_{17.4}{\mathrm{Si}}_{x}$ $(7<~x<~12)$ 1/1-1/1-1/1 approximants was discussed in terms of their electronic structure near the Fermi level and the local atomic arrangements. Strong composition dependence of the electrical resistivity was o…
Slipping through the lattice: Molecular oxygen reacts with crystals of quinodimethane 1 to give highly crystalline alternating copolymers by means of a radical mechanism. An X-ray crystallographic study indicates that the unique arrangement of 1 in the crystal is crucial to the copolymerization.
Abstract Porous conducting polypyrrole (PPy) films have been obtained by electrochemical synthesis–solvent extraction method. The results of scanning electron microscopy (SEM) show that the size and the distribution of pores can be controlled during the electrochemical synthesis. The porous PPy films have sufficiently…
The in vitro rate and specificity of fibrillogenesis in type I collagen depends on the integrity of the amino (N)-telopeptide domain. In vivo an intact N-telopeptide domain is also required for normal fibril assembly. Although Chou-Fasman predictions and NMR studies suggested that a type I beta-turn could be induced i…
A high-purity ${\mathrm{Sr}}_{2}{\mathrm{FeMoO}}_{6}$ sample was synthesized. According to Rietveld analysis of x-ray diffraction (XRD) data the occupancy of Fe at its regular B site was 95.6% with the rest occupying the Mo site, i.e., the antisite of Fe. Despite this, according to ${}^{57}\mathrm{Fe}$ M\"ossbauer spe…
The development of synthetic biodegradable polymers, such as poly(alpha-hydroxy acid), is particularly important for constructing medical devices, including scaffolds and sutures, and has attracted growing interest in the biomedical field. Here, we report a novel approach to preparing high molecular weight poly(malic…
Picosecond transient absorption spectroscopy of diiron(III) mu-oxo bisporphyrins appended to xanthene, (DPX)Fe2O and (DPXM)Fe2O, and dibenzofuran (DPD)Fe2O have been investigated in order to decipher the effect of a spring-loaded cleft on their photophysics and attendant oxidation photocatalysis. The tension of the co…
A novel, structurally characterized Ni(III) complex of an N-confused porphyrin inner C-oxide has been synthesized from the oxidation of a Ni(II) N-confused porphyrin using OsO4. Crystal data: C53H40N5NiO.CH2Cl2, monoclinic, space group P2/a (No. 13), a=21.229(1) A, b=8.6451(5) A, c=25.762(2) A, beta=93.004(3) degrees,…
The dynamics of magnetization under femtosecond optical excitation is studied in a ferromagnetic semiconductor ${\mathrm{Ga}}_{0.94}{\mathrm{Mn}}_{0.06}\mathrm{As}$ with a time-resolved magneto-optical Kerr effect measurement with two-color probe beams. The transient reflectivity change indicates the rapid rise of the…
Shape evolution of one-dimensional (1D) single-crystalline ZnO nanostructures, which were produced via a facile microemulsion-based approach, was clarified by SEM observations by stepwise prolonging the reaction time. It suggested that at the initial stage the nucleation process dominated and the shape of ZnO nanostru…
Polycrystalline quartz was formed from amorphous silica in seawater and distilled water at temperatures and pressures ranging from 50 to 450o C and 50 MPa to 3 GPa, respectively. The data at 100 and 200 MPa pressures can be reasonably modeled using Avrami' s nucleation and growth equation. Experimental results reveal…
Abstract Waterborne polyurethane (WPU) and casein (1 : 1 by weight) were blended at 90°C for 30 min, and then were crosslinked by adding 1–10 wt % ethanedial to prepare a series of sheets. Their structure and properties were characterized by using infrared spectroscopy, scanning electron microscopy, thermogravimetric…
The solubility of water in melts of the haplobasaltic system (N a AlSi 3 O g -CaAl 2 Si 2 O 8 -CaMgSi 2 O 6 , Ab-An-Di) was investigated at pressures of 50, 200 and 500 MPa and at temperatures between 1200°C and 1420°C using an internally heated gas pressure vessel. Compositions close to the binary joins Ab 100 -An 10…
Abstract In this investigation, the influence of filler type and filler content on the mechanical properties of nylon‐6 is investigated. The mineral fillers were selected on the basis of their shape and size: flake‐like kaolin and talc, spherical glass beads or fibrous wollastonite. These fillers were added to nylon‐6…
A general phenomenological description and a simple molecular model is proposed for the "discrete" flexoelectric effect in tilted smectic liquid crystal phases. This effect defines a polarization in a smectic layer induced by a difference of director orientations in the two smectic layers adjacent to it. It is shown t…
Abstract Various kinetic models, namely, the Avrami analysis modified by Jeziorny, the Ozawa model, and a method developed by Mo, were applied to describe the nonisothermal melt crystallization process of poly(ethylene terephthalate) (PET) and two PET/clay nanocomposites of different viscosities. The Avrami analysis m…
This paper describes the chemical functionalization of hydrogen-terminated porous silicon surfaces with simple and functional 1-alkenes under microwave irradiation to give organic monolayers covalently attached to the surface through Si−C bonds. Using microwaves as a source of energy led to a remarkable increase in th…