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61.
Alice E. Dearle Daniel J. Cutler Hector W. L. Fraser Sergio Sanz Edward Lee Sourav Dey Ismael F. Diaz‐Ortega Gary S. Nichol Hiroyuki Nojiri Marco Evangelisti Gopalan Rajaraman Jürgen Schnack Leroy Cronin Euan K. Brechin 《Angewandte Chemie (Weinheim an der Bergstrasse, Germany)》2019,131(47):17059-17062
The dissolution of anhydrous iron bromide in a mixture of pyridine and acetonitrile, in the presence of an organic amine, results in the formation of an [Fe34] metal oxide molecule, structurally characterised by alternate layers of tetrahedral and octahedral FeIII ions connected by oxide and hydroxide ions. The outer shell of the complex is capped by a combination of pyridine molecules and bromide ions. Magnetic data, measured at temperatures as low as 0.4 K and fields up to 35 T, reveal competing antiferromagnetic exchange interactions; DFT calculations showing that the magnitudes of the coupling constants are highly dependent on both the Fe‐O‐Fe angles and Fe?O distances. The simplicity of the synthetic methodology, and the structural similarity between [Fe34], bulk iron oxides, previous FeIII–oxo cages, and polyoxometalates (POMs), hints that much larger molecular FeIII oxides can be made. 相似文献
62.
Alsabery A. I. Ismael M. A. Chamkha A. J. Hashim I. 《Journal of Thermal Analysis and Calorimetry》2019,135(1):729-750
Journal of Thermal Analysis and Calorimetry - This paper investigates a steady mixed convection in a lid-driven square cavity subjected to an inclined magnetic field and heated by corner heater... 相似文献
63.
Nitesh Mittal Tobias Benselfelt Farhan Ansari Korneliya Gordeyeva Stephan V. Roth Lars Wgberg L. Daniel Sderberg 《Angewandte Chemie (International ed. in English)》2019,58(51):18562-18569
Designing engineering materials with high stiffness and high toughness is challenging as stiff materials tend to be brittle. Many biological materials realize this objective through multiscale (i.e., atomic‐ to macroscale) mechanisms that are extremely difficult to replicate in synthetic materials. Inspired from the architecture of such biological structures, we here present flow‐assisted organization and assembly of renewable native cellulose nanofibrils (CNFs), which yields highly anisotropic biofibers characterized by a unique combination of high strength (1010 MPa), high toughness (62 MJ m?3) and high stiffness (57 GPa). We observed that properties of the fibers are primarily governed by specific ion characteristics such as hydration enthalpy and polarizability. A fundamental facet of this study is thus to elucidate the role of specific anion binding following the Hofmeister series on the mechanical properties of wet fibrillar networks, and link this to the differences in properties of dry nanostructured fibers. This knowledge is useful for rational design of nanomaterials and is critical for validation of specific ion effect theories. The bioinspired assembly demonstrated here is relevant example for designing high‐performance materials with absolute structural control. 相似文献
64.
We study the combined effects of dynamic gain saturation and two-photon absorption on the amplification of short pulses in semiconductor optical amplifiers and show that two-photon absorption can saturate the amplifier gain and limit the output pulse energies even for amplifiers with large gain saturation energies. We discuss the upper limits for the pulse energies obtainable from semiconductor optical amplifiers in the presence of two-photon absorption and show that for single transverse mode waveguide amplifiers these upper limits can range from values as small as a few picojoules to several hundred picojoules for pulse widths in the 0.5 ps to 20 ps range, respectively. 相似文献
65.
Hussein Bassal Akram Hijazi Hussein Farhan Christine Trabolsi Bouchra Sayed Ahmad Alia Khalil Marc Maresca Fawaz El Omar 《Molecules (Basel, Switzerland)》2021,26(15)
Psophocarpus tetragonolobus has long been used in traditional medicine and cuisine. In this study, Psophocarpus tetragonolobus extracts were isolated by maceration and ultrasound-assisted extraction and were evaluated for their antioxidant and anti-inflammatory effects in lipopolysaccharide (LPS)-stimulated RAW264.7 macrophages. The obtained results show that both extracts (maceration and ultrasound) were rich in bioactive molecules and exerted substantial antioxidant and anti-inflammatory effects. The P. tetragonolobus extracts’ treatment in LPS-stimulated RAW264.7 macrophages resulted in a significant downregulation of the expressions of tumor necrosis factor-α (TNF-α), interleukin-6 (IL-6), and IL-1β mRNA. In addition, the P. tetragonolobus extracts’ treatment attenuated inducible nitric oxide synthase (iNOS) and cyclooxygenase-2 (COX-2) protein expression. Our observations indicate that there is no significant difference between the two studied extracts of P. tetragonolobus in terms of biological properties (specifically, antioxidant and anti-inflammatory effects. Regardless of the extraction method, P. tetragonolobus could be used for treating diseases related to oxidative stress and inflammatory reactions. 相似文献
66.
Ye Jingyao Al-Jobory Alaa Zhang Qian-Chong Cao Wenqiang Alshehab Abdullah Qu Kai Alotaibi Turki Chen Hang Liu Junyang Ismael Ali K. Chen Zhong-Ning Lambert Colin J. Hong Wenjing 《中国科学:化学(英文版)》2022,65(9):1822-1828
Science China Chemistry - Destructive quantum interference (DQI) provides a unique approach to controlling the leakage current in the OFF state of molecular devices. However, the DQI in... 相似文献
67.
Journal of Solid State Electrochemistry - Remarkable selective analysis of biomolecules i.e., glucose and ascorbic acid on copper oxide facets was reported for the first time. The copper oxide... 相似文献
68.
A new class of 2-arylamino-dihydroxyindenopyrroles were prepared by the one-pot multicomponent reaction of ninhydrin, N-methyl-1-(methylthio)-2-nitroethenamine and aromatic amines in EtOH at room temperature. The advantages of this procedure are short reaction times, good to high yields, easy separation of products and good functional group tolerance. 相似文献
69.
Dosage des traces de magnésium dans l'aluminium par le para-nitrobenzène-azo-α-naphtol (magneson II)
F. Farhan 《Mikrochimica acta》1950,35(4):560-564
Zusammenfassung Es wird ein Verfahren zur Extraktion und nachfolgenden spektrophotometrischen Bestimmung von Magnesiumspuren in hochgradig gereinigtem Aluminium beschrieben. Die mit Magneson II (p-Nitrobenzol-azo--naphthol) entwickelte Blaufärbung gelangt hierfür zur Anwendung. Es konnten so noch 0,00015% Magnesium mit einem ungefähren relativen Fehler von 5% bestimmt werden.
Résumé d'une Thèse soutenue devant la Faculté des Sciences de Paris, le 22 juin 1950.
Avec 2 figures. 相似文献
Summary The author gives a procedure for the extraction of traces of magnesium in extra pure aluminum. He then determined these traces by a spectrophotometric method in which he used the blue coloration given with magneson II. He thus measured 1,5 p. p. m. of magnesium with a probable error of the order of 5% (Magneson II = para-nitrobenzene-azo--naphthol).
Résumé L'auteur donne un procédé d'extraction des traces de magnésium dans l'aluminium extra-pur, puis, il dose ces traces par voie spectrophotométrique, en se servant de la coloration bleue donnée avec le magnéson II; il mesure ainsi 1,5 p. p. m. de magnésium avec une erreur probable de l'ordre de 5%.
Résumé d'une Thèse soutenue devant la Faculté des Sciences de Paris, le 22 juin 1950.
Avec 2 figures. 相似文献
70.
Juan Antonio González Ismael Mozo Isaías García de la Fuente José Carlos Cobos Nicolás Riesco 《The Journal of chemical thermodynamics》2008,40(10):1495-1508
Densities, ρ, and speeds of sound, u, of systems formed by 1-heptanol, or 1-octanol, or 1-decanol and dibutylether have been measured at a temperature of (293.15, 298.15, and 303.15) K and atmospheric pressure using a vibrating tube densimeter and sound analyser Anton Paar model DSA-5000. The ρ and u values were used to calculate excess molar volumes, VE, and deviations from the ideal behaviour of the thermal expansion coefficient, Δαp and of the isentropic compressibilities, ΔκS. The available database on molar excess enthalpies, HE, and VE for (1-alkanol + linear monoether) systems was used to investigate interactional and structural effects in such mixtures. The enthalpy of the OH?O bonds is lower for methanol solutions, and for the remainder systems, it is practically independent of the mixture compounds. The VE variation with the chain length of the 1-alkanol points out the existence of structural effects for systems including longer 1-alkanols. The ERAS model is applied to the studied mixtures. ERAS represents quite accurately HE and VE data using parameters which consistently depend on the molecular structure. 相似文献