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。
We show that the extension of the widely studied GaMnAs system to quaternary ${\text{Ga}}_{1\ensuremath{-}\text{x}}{\text{Mn}}_{\text{x}}{\text{As}}_{1\ensuremath{-}\text{y}}{\text{P}}_{\text{y}}$ alloys allows to change and inverse the Mn doping induced uniaxial strain and thus the uniaxial magnetocrystalline anisotr…
In this study, discotic azo compounds were prepared by a reductive coupling of 5-nitroisophthalic acid followed by a convergent synthesis, resulting in five new examples of azo photoisomerizable discotic molecules, which differ from each other by the linking groups (ester, amide or 1,3,4-oxadiazole) and number of alip…
Abstract The thermal degradation products of 1-alkyl-3-methyl-imidazolium-type ionic liquids (e.g., BMIM, EMIM), which are commonly used in cellulose chemistry, were identified. Imidazole ( 5 ), N -methylimidazole ( 6 ), and N -alkylimidazoles ( 7 , 8 ) are the main products. Moreover, dimeric substituted imidazoles (…
The generation of arbitrarily shaped nonspherical laser-induced cavitation bubbles is demonstrated with a optical technique. The nonspherical bubbles are formed using laser intensity patterns shaped by a spatial light modulator using linear absorption inside a liquid gap with a thickness of 40 microm. In particular we…
Ultra‐fine HfC powders with particle sizes of 380 or 225 nm were synthesized by carbothermal reduction of HfO 2 with graphite or carbon black, respectively. The investigation of the process indicated that a vacuum level as high as 5 Pa was appropriate for decreasing the reaction temperature and consequently limiting t…
This study presents first investigations on the high‐temperature stability and microstructure evolution of SiOC/HfO 2 ceramic nanocomposites. Polymer‐derived SiOC/HfO 2 ceramic nanocomposites have been prepared via chemical modification of a commercially available polysilsesquioxane by hafnium tetra ( n ‐butoxide). Th…
The presence of nanodomains in polymer‐derived ceramics constitutes one of the most intriguing features of this class of materials. In the present work, the nanostructure of novel carbon‐rich silicon carbonitride (SiCN) ceramics synthesized via thermolysis of poly(methylphenylsilylcarbodiimide), –[Ph(CH 3 ) Si‐NCN] n…
The piezoelectric and ferroelectric properties of 0.852[Bi 0.5 (Na (1− x ) Li x ) 0.5 ]TiO 3 –0.110(Bi 0.5 K 0.5 )TiO 3 –0.038BaTiO 3 ( x =0, 0.02, 0.05, 0.10, 0.15, and 0.30, abbreviated as BNKLBT x ) lead‐free piezoelectric ceramics were prepared by conventional ceramic processing. X‐ray diffraction on the samples r…
ZrB 2 –SiC coating on C/C composites was prepared through vapor silicon infiltration process. The coated C/C composites showed excellent oxidation performance at 1500°C. Isothermal oxidation results showed that there was weight gain accompanied in the whole oxidation process and no evidence of oxidation of C/C composi…
To reduce energy losses by thermalization of charge carriers in a silicon solar cell, quantum-cutting luminescent materials are desired for the efficient downconversion of UV-visible radiation into near-IR radiation. In this Letter, quantum cutting involving emission of two near-IR photons for each UV-blue photon abso…
Visible-light emitting single-walled carbon nanotubes (SWNTs)/organic hybrids have been successfully synthesized and promise to be a photon source to be used in future optoelectronic devices. The nanohybrids are “peapods” having sexithiophene molecules inside the hollow space of SWNTs. High-resolution transmission ele…
An efficient green phosphor, Ba 2 MgSi 2 O 7 :Eu 2+ , was prepared by a solid‐state reaction. Excited by 350–420 nm light, the phosphor shows a strong and broad emission band centering at 505 nm. The concentration quenching mechanism was verified to be a dipole–dipole interaction and the critical energy‐transfer dista…
We present a simple method to fabricate a polymer optical sheet with antireflection and antifogging properties. The method consists of two consecutive steps: photocross-linking of UV-curable polyurethane acrylate (PUA) resin and reactive ion etching (RIE). During photopolymerization, the cured PUA film is divided into…
High–surface area gold catalysts exhibit promising properties suitable for industrial application.
Goldeneye: A model for CO oxidation on gold electrodes in alkaline media is presented, and it assumes that CO enhances the adsorption of its own oxidant. This model explains a reaction order larger than 1, and that dissolved CO was easier to oxidize than adsorbed CO. DFT calculations confirmed that CO and OH enhanced…
A novel cavity-containing porphyrin catalyst based on a previously reported clip architecture, substituted on the outer face with urea terminated tails, has been synthesized, and its properties toward the epoxidation of polybutadiene have been studied. It is shown that the presence of the urea tails provides efficient…
Shape memory alloys (SMAs) belong to the class of smart materials and have been used in numerous applications. Solid phase transformations induced either by stress or temperature are behind the remarkable properties of SMAs that motivate the concept of innovative smart actuators for different purposes. The SMA element…
Eine glänzende Gelegenheit: Eine Erklärung für den chemoselektiven Verlauf der Hydrierung α,β-ungesättigter Ketone (oder Aldehyde) zu ungesättigten Alkoholen mit monodispersen Au25(SR)18-Partikeln als Katalysator wird vorgeschlagen (siehe Bild). Dank der nun bekannten Struktur dieser Nanopartikel können Struktur-Aktiv…
An experimental investigation of the impact of sample inhomogeneity on measurements of the linear elongational viscosity of two low-density polyethelenes is presented. A novel method of in-situ measurements of the diameter of samples under extension has recently been implemented to properly account for the sample non-…
Abstract Rigid polyurethane foam (PUF) filled with mixture of alumina trihydrate (ATH) and triphenyl phosphate (TPP) as fire retardant additive was prepared with water as a blowing agent. In this study, the ATH content was varied from 10 to 100 parts per hundred polyol by weight (php), and TPP was used at a higher loa…