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。
In the past few decades, supramolecular polymers have emerged as novel materials with a wide variety of different functions. In this essay we reflect on the history of supramolecular polymers, their function in various applications and the challenges to be met in the near future.
There is a controversy in the literature over whether small gases, such as Ne, can adsorb in the interstitial channels (ICs) of carbon nanotube bundles. We distinguish between two types of ICs: nondefect, defined as ICs in perfectly packed arrays of nanotubes having all of the same diameter (homogeneous) defined where…
Initial sintering rates of nearly monodisperse Pd model catalyst particles on silica, titania, and mixtures thereof were measured as a function of temperature on the time scale of a few seconds in the gas phase. Support particles and active phase were synthesized by aerosol based techniques permitting a high degree of…
We performed low-temperature electron transport spectroscopy to evaluate defects in individual single-walled carbon nanotube (SWNT) devices assembled via dielectrophoresis from a surfactant-free solution. At 4.2 K, the majority of the devices show periodic and well-defined Coulomb diamonds near zero gate voltage corre…
Gas-phase production of carbon nanotubes in presence of a metal catalyst with a continuous wave ${\text{CO}}_{2}$ laser is investigated by combining coherent anti-Stokes Raman scattering (CARS), laser-induced fluorescence (LIF), and laser-induced incandescence (LII). These in situ techniques provide a unique investiga…
Abstract Bi2(FexAl1–x)4O9 solid solutions with 0.1 ≤ x ≤ 1.0 prepared by mechanochemical processing of α‐Fe2O3/Bi2O3/Al2O3 mixtures and subsequent annealing were investigated by X‐ray diffraction, Mössbauer spectroscopy, and EDX. A Rietveld refinement was made for the whole range of the solid solutions. The structure…
Abstract Gadolinium disulfide was prepared by high‐pressure synthesis at 8 GPa and 1173 K. It crystallizes in the monoclinic space group P121/a1 (No. 14) with lattice parameters a = 7.879(1) Å; b = 3.936(1) Å, c = 7.926(1) Å and β = 90.08(1)°. The crystal structure is a twofold superstructure of the aristotype ZrSSi a…
A study of the temperature dependence of the electromechanical response of ferroelectric lead zirconate titanate (PZT) ceramics at high electric fields (up to 1.3 kV mm −1 ) is reported. Simultaneous measurements were performed of strain, electric field and polarization to form a complete response map from room temper…
A focused ion beam and electron backscatter diffraction were used to investigate the three-dimensional microstructure of small dynamically recrystallised grains in a deformed Cu–Sn alloy and to determine their orientation relationships. It was found that many of the grains, which form as thin sheets at the prior bound…
The gas phase interaction between borazine (IBz) and diborane (DB) has been investigated using MP2/6-311++G** and M05-2X/6-311++G** methods. The calculations have also been carried out at the same levels on the intermolecular complex formed between benzene (Bz) and DB to compare the modes of interaction. The complexat…
Broadband dielectric spectra of supercooled 1,2,6-hexanetriol are presented in order to reveal physical picture behind a glass transition of polyhydric alcohols. It has been reported so far that temperature dependences of alpha relaxation time for sugar alcohols exhibit systematic trend against number of carbon atoms…
A study is presented of the preparation of zeolite films (Pt/ZSM5 and Pt/Zeolite Y) on microreactor channels with a diameter of 500 μm. The catalysts were prepared and fully characterized as powders and then incorporated into the microreactors by a seeded hydrothermal synthesis procedure. The performance of the zeolit…
Lanthanide-doped RbY 2 F 7 nanocrystals with a mean diameter of approximately 10 nm were synthesized at 185 °C in the high boiling organic solvent N -(2-hydroxyethyl)-ethylenediamine (HEEDA) using ammonium fluoride, rare earth chlorides, and a solution of rubidium alkoxide of N -(2-hydroxyethyl)-ethylenediamine in HEE…
Currently, we witness a fabulous revival of blue phases. For many years, the small temperature range of blue phase stability in traditional systems seemed to restrict the extremely interesting research on these defect structures to purely academic questions. But the dramatically extended stability range in polymer-sta…
The thermoelectric properties of inclinedly oriented thin films of layered cobaltite Ca x CoO 2 have been investigated in response to infrared lamp heating. Upon heating the film surface, anisotropic voltage signals were identified along the film in-plane directions, which showed a close relation to the inclined cryst…
Abstract Melt polycondensation was used to prepare a systematic series of random and amorphous copolyesters using the following cycloaliphatic diesters: dimethyl‐1,4‐cyclohexane dicarboxylate (DMCD), dimethyl bicyclo[2.2.1]heptane‐1,4‐dicarboxylate (DMCD‐1), dimethyl bicyclo[2.2.2]octane‐1,4‐dicarboxylate (DMCD‐2), di…
With ultrafast electron microscopy (UEM), we report observation of the nanoscopic crystallization of amorphous silicon nitride, and the ultrashort optomechanical motion of the crystalline silicon nitride at the interface of an adhering carbon nanotube network. The in situ static crystallization of the silicon nitride…
Abstract The oxidative/hydrolytic stability of polyurethanes (PUs) containing exclusively polyisobutylene (PIB), or mixed PIB/polytetramethylene oxide (PTMO), or mixed PIB/polyhexamethylene carbonate (PC) soft segments was investigated. The tensile strengths and elongations of various PUs were determined before and af…
Abstract Y2Si2O7 is an intriguing material combining a complex structural polymorphism with several important technological applications. Raman spectra were experimentally determined for most of the seven known modifications of Y2Si2O7 except the form ε, and in the case of β, γ, δ and ζ for the first time. The error‐p…
Spectral fluctuations observed in single CdSe/ZnS nanocrystals at 5 K are found to be entirely the result of discrete charge hops in the local environment of the nanocrystal, which occur at a rate comparable to the acquisition time of a single spectrum. We show that intervals between discrete spectral hops introduce a…