Precise Vibrational Analysis of B-X System of BiI

The bands of the B-X system of BiI have been photographed in the second order of a 35 ft concave grating spectrograph (with a dispersion of 0.33 Åing;/mm and resolution 2 × 180,000). A precise vibrational analysis of this system has been carried out and the vibrational constants WeYe and WeZe for the upper and lower states have been evaluated for the first time.     

Study of the lithium thiocyanate quadrupole by ultra-violet absorption spectroscopy

A spectroscopic method for studying quadrupole formation is described, and experimental results are presented for lithium thiocyanate in a tetrahydrofuran/hexane solvent system. From molar absorptivity equations and an equation by Fuoss and Kraus, a direct relationship is derived between the quadrupole formation constant, K_Q, and the dielectric constant of the medium. Experimental results are consistent with the equation and allow an estimate of the distance between lithium and thiocyanate in the ion pair.     

Quantification of Dopamine in Portulaca oleracea Linn,by High-Performance Thin-Layer Chromatography

JPC – Journal of Planar Chromatography – Modern TLC - A sensitive and accurate high-performance thin-layer chromatographic method has been developed, validated, and used for...     

Back Cover: Electrochemical Radical Borylation of Aryl Iodides (Chin. J. Chem. 4/2019)

The back cover picture shows an electrochemical strategy for the borylation of aryl iodides via a radical pathway using current as a driving force. This method features mild reaction conditions, good functional groups tolerance, and prompt reaction time. EPR, CV and DPV experiments verified the formation of aryl radicals in this electrochemical borylation reaction, and the current plays an important role in the generation of radical intermediate. More details are discussed in the article by Mo et al. on page 347–351.

     

Effect of 100 MeV O7+ ions irradiation on ethanol sensing response of nanostructures of ZnO and SnO2

Tin dioxide nanoparticles and zinc oxide nanorods were synthesized chemically and thick film gas sensors on alumina substrates were fabricated of these materials. Morphology and crystallite size of synthesized powders were investigated by TEM. The fabricated sensors were irradiated with 100 MeV O⁷⁺ ions at fluences of 1×10¹¹, 1×10¹² and 1×10¹³ ions/cm². The X-ray diffraction analysis of the samples before and after ion bombardment was performed for structural characterization. The sensing response to ethanol before and after irradiation was carried out for each fabricated sensor. Investigation revealed that irradiated SnO₂ based sensor’s response and response time increased significantly. Results show that ZnO based sensor exhibit strong resistance to damage caused by ion irradiation which might be due to defects annihilation.     

Different strategies for the synthesis of graphene/ZnO composite and its photocatalytic properties

Owing to its unique physical and chemical properties, graphene has attracted tremendous attention in the preparation of graphene-based composites for various applications. In this study, two different strategies have been developed to load zinc oxide (ZnO) nanorods onto reduced graphene oxide (RGO) sheets, i.e., in situ growth and a self-assembly approach. The microstructure and morphology of the synthesized RGO/ZnO nanocomposites was investigated by X-ray diffraction (XRD), Raman spectroscopy, field emission scanning electron microscopy (FESEM) and Brunauer–Emmett–Teller (BET) measurements. Fluorescence emission spectra (PL) of RGO/ZnO composites were performed to attribute quality of combination between RGO and ZnO. Significantly enhanced photocatalytic activity of RGO/ZnO nanocomposites in comparison to bare ZnO nanoparticles was revealed by the degradation of methylene blue under irradiation, which can be attributed to the inhibition of electron–hole pair recombination and enhanced adsorption due to the presence of RGO sheets.     

Frequency domain approach for probabilistic flutter analysis using stochastic finite elements

Meccanica - In this work, a stochastic finite element method based on first order perturbation approach is developed for the probabilistic flutter analysis of aircraft wing in frequency domain....     

HPTLC Quantitation of Camptothecin in Nothapodytes foetida (Wight) Sleumer Stem Powder

JPC – Journal of Planar Chromatography – Modern TLC - A sensitive and reliable high-performance thin layer chromato-graphic method has been developed for quantitation of camp-tothecin...