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 direct selective synthesis of clamshell-type binuclear phthalocyanines via structural modification of monohydroxyphthalocyanines in up to 95% yield has been developed. Previously unknown clamshell-type Lu complex has been obtained. The spectral properties of the resulting binuclear phthalocyanines have been studied.
Abstract magnified image Diastereomeric biaryliminium cations made of an ( R a)‐5,5′,6,6′,7,7′,8,8′‐octahydrobinaphthyl core and exocyclic appendages derived from ( S )‐ or ( R )‐3,3‐dimethylbutan‐2‐amine are effective asymmetric epoxidation catalysts for unfunctionalized alkenes. Herein, we report that the negative c…
The specifics of X-ray-induced reduction of copper(II) ions in the polyacrylic acid-polyethyleneimine-copper(II) (PAA-PEI-Cu 2+ ) complexes were studied. It was found that the action of radiation led to the effective reduction of Cu 2+ in the PAA-PEI-Cu 2+ films swollen in an aqueous-alcohol medium. The formation of m…
Magnesium alloy AE42 has long been recognized as a superior high temperature magnesium alloy for aerospace and automotive components. The elevated temperature strength of this alloy is attributed to the Mg-Alx-REy intermetallics on the grain boundaries preventing grain boundary sliding. However, these intermetallics a…
A measurement of quantum yield of up-conversion luminescence has been done for the Er(3+)-doped transparent oxyfluoride glass-ceramics 32(SiO,)9(AlO1.5)31.5(CdF2)18.5(PbF2)5.5(ZnF2): 3.5(ErF3) mol%, where most of Er3+ dopants partition in 8 nm diameter nano-crystals Er10Pb25F65. The yield was found by newly proposed m…
The inhibition effect of some phenylhydrazone derivatives, namely,.[ethyl(2Z)-cyano[(4E)-5-oxo-3-phenyl-4-(phenylhydrazono)-1,3-thia-zolidin-2-ylidene] acetate (A), ethyl(2Z)-cyano[(4E)-5-oxo-3-phenyl-4-(p-methylphenylhydrazono)-1,3-thiazolidin-2-ylidene] acetate (B), ethyl(2Z)-cyano[(4E)-5-oxo-3-phenyl-4-(o-methoxyph…
The corrosion inhibition of Neem (Azadirachta indica (AZI)) leaves extract as a green inhibitor of zinc corrosion in H2SO4 has been studied using the gravimetric method. The results of the study reveal that the different concentrations of the AZI extract inhibit zinc corrosion and that inhibition efficiency of the ext…
Mössbauer studies of perovskites Bi1−x La x FeO3 (x = 0, 0.10, 0.20, 0.61, 0.90, 1.00) were conducted at 295 and 87 K. The spatial spin-modulated structure (SSMS) observed in perovskites BiFeO3 and Bi0.9La0.1FeO3 leads to a specific distribution of hyperfine fields P(B) with two peaks. Substitution of La for Bi (x = 0…
Amorphous thin films with compositions Se1−xSbx (x=0, 0.025, 0.05, 0.075, and 0.10 at. %) have been deposited by thermal evaporation (at ∼10−4 Pa) from bulk samples. The compositional dependence of their optical properties, refractive index, extinction coefficient, absorption coefficient, and optical band gap with inc…
We have investigated the magnetic and dielectric properties of A 2 CoSi 2 O 7 ( A =Ca, Sr, and Ba) crystals with a two-dimensional network of CoO 4 and SiO 4 tetrahedra connected with each other through the corners. In Ca 2 CoSi 2 O 7 , a weak ferromagnetic transition occurs at 5.7 K, where the dielectric constant par…
The earliest reported observations of hysteresis in rocks were published at the beginning of the last century. In analogy with magnetic systems, a Preisach model was adapted in the early 1980s and used to describe the elastic hysteresis in rocks. In spite of its apparent success, as with any model of a physical proces…
Abstract The spin-crossover (SCO) complex [Fe(qnal)2]·CH2Cl2 (1), (Hqnal: N-(8′-quinolyl)-2-hydroxy-1-naphthaldimine) with an N4O2 donor set, has been synthesized and characterized. Investigation of magnetic properties shows that the complex exhibits an abrupt and complete spin transition with a 5 K wide thermal hyste…
The orientational mobility of segments in dendrimers are studied by the method of Brownian dynamics, and the results are analyzed in terms of an earlier proposed analytical theory. The orientational autocorrelation function for the cosine of an angle of segmental rotation in dendrimers of a given generation P 1(t) is…
We report a novel technique of directly coating colloidal CdSe/ZnS core/shell quantum dots (QDs) with silk fibroin (SF), a protein derived from the Bombyx mori silk worm. The approach results in protein-modified QDs with little or no particle aggregation, and mitigates the issue of biocompatibility. QDs have desirable…
We have investigated phosphorus ion (P+) implantation in Si nanocrystals (SiNCs) embedded in SiO2, in order to clarify the P donor doping effects for photoluminescence (PL) of SiNCs in wide P concentrations ranging in three orders. Some types of defects such as Pb centers were found to remain significantly at the inte…
Problem statement: The chitosan derivatives promote diverse defensive responses in plants, which are affected by chitosan chemical fea tures and concentration. Glucanase (EC 3.2.1.6), Phenylalanine Ammonia-Lyase (PAL, EC 4.3.1.5) and peroxidase (POD, EC 1.11.1.6) are key enzymes in tobacco defense responses. Thus, the…
The comparative study of the role of binary oxide support on catalyst physico-chemical properties and performance in methanol synthesis were undertaken and the spinel like type structures (ZnAl 2 O 4 , FeAlO 3 , CrAl 3 O 6 ) were prepared and used as the supports for 5% metal (Cu, Ag, Au, Ru) dispersed catalysts. The…
A shallow explosion in a fluid is one of the fundamental processes of airwave generation in volcanic eruptions. To better understand the mechanism of the airwave generation, underwater explosion experiments were conducted. Although the underwater explosions have been intensely studied over the last century, airwaves h…
The Curie point ( T c ) of Ba(Ti 1- x Al x )O 3-δ shifted to lower temperatures as the Al content ( x ) was increased. In the high-temperature region (>350 °C), dielectric constants markedly increased with increasing temperature. At lower frequencies (<1 kHz), dielectric constants steeply decreased with increasing fre…
We study epitaxial NdNiO3 thin films on NdGaO3(001) single-crystal substrates grown using a pulsed-laser deposition method. The films show a clear first-order metal-insulator transition (MIT) at TMI∼240 K, which is significantly higher than TMI∼190 K in bulk NdNiO3. The x-ray reciprocal space map shows in-plane tensil…