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The biological potentials of substituted 1,2-diazines: a review on versatile pyridazine derivatives

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Journal of Chinese Pharmaceutical Sciences 2016年第10期25卷 707-725页

作者： Mohammad Asif Department of Pharmacy GRD (PG) Institute of Management and Technology

Many studies have been performed on the pyridazine(1,2-diazine) derivatives in the past decade. This heterocyclic nucleus possesses almost all types of pharmacological activities. This small and simple pyridazine nucleus is present in various compounds that are involved in the research aiming to evaluate new compounds with interesting biological activities, including anti-bacterial, anti-fungal, anti-viral, analgesic, anti-inflammatory, anti-platelets, anti-ulcer, anti-secretory, anti-depressants, anxiolytics, sedative-hypnotics, anti-convulsant, anti-tumor, anti-thrombotics, cardiotonics, vasodilatators, anti-arrhythmics, anti-diabetic, anti-tubercular agents and so on. This review focuses on the pyridazine derivatives with potential activities that have been developed. Pyridazine compounds draw attention of scientists and researchers because of their diverse biological activities as well as simple chemical and easy functionalization at various ring positions, making them attractive synthetic building blocks for designing and development of novel pyridazinone-based therapeutic agents.

关键词： Pyridazines Heterocyclic Pharmacological activities

Structural and photoluminescence studies on europium-doped lithium tetraborate(Eu:Li2B4O7)single crystal grown by microtube Czochralski(μT-Cz)technique

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Chinese Physics B 2016年第5期25卷 429-433页

作者： A Kumaresh R Arun Kumar N Ravikumar U Madhusoodanan B S Panigrahi K Marimuthu M Anuradha grd Centre for Materials Research PSG College of TechnologyCoimbatoreIndia Department of Physics PSG College of TechnologyCoimbatoreIndia Radiation Safety Division Indira Gandhi Centre for Atomic ResearchKalpakkamIndia Department of Physics Gandhigram Rural UniversityDindigulIndia PSG Institute of Advanced Studies CoimbatoreIndia

Rare earth europium（Eu（3＋））-doped lithium tetraborate（Eu：Li_2B_4O_7） crystal is grown from its stoichiometric melt by microtube Czochralski pulling technique（μT-Cz） for the first time. The grown crystals are subjected to powder x-ray diffraction（PXRD） analysis which reveals the tetragonal crystal structure of the crystals. UV–vis–NIR spectral analysis is carried out to study the optical characteristics of the grown crystals. The crystal is transparent in the entire visible region, and the lower cutoff is observed to be at 304 nm. The existence of BO_3 and BO_4 bonding structure and the molecular associations are analyzed by Fourier transform infrared（FTIR） spectroscopy. The results of excitation and emission-photoluminescence spectra of europium ion incorporated in lithium tetraborate（LTB） single crystal reveal that the observations of peaks at 258,297, and 318 nm in the excitation spectra and peaks at 579, 591, 597, 613, and 651 nm are observed in the emission *** chromaticity coordinates are calculated from the emission spectra, and the emission intensity of the grown crystal is characterized through a CIE 1931（Commission International d＇Eclairage） color chromaticity diagram.

关键词： crystal growth optical material growth from melt photoluminescence study

Grain boundary effect on structural, optical, and electrical properties of sol-gel synthesized Fe-doped SnO_(2) nanoparticles

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Chinese Physics B 2021年第4期30卷 555-564页

作者： Archana V Lakshmi Mohan Kathirvel P Saravanakumar S Department of Sciences Amrita School of EngineeringCoimbatoreAmrita Vishwa VidyapeethamIndia Research and Development Center Bharathiar UniversityCoimbatore-641046TamilnaduIndia grd Center for Materials Research Department of PhysicsP S G College of TechnologyCoimbatore-641004TamilnaduIndia Department of Physics N S S CollegePandalam-689501KeralaIndia

Tin oxide(SnO_(2)) and iron-doped tin oxide(Sn_(1-x)Fe_(x)O_(2),x=0.05 wt%,0.10 wt%) nanoparticles are synthesized by the simple sol-gel *** structural characterization using x-ray diffraction(XRD) confirms tetragonal rutile phases of the *** variations in lattice parameters and relative intensity with Fe-doping concentration validate the incorporation of iron into the *** compressive strain present in the lattice estimated by using peak profile analysis through using Williamson-Hall plot also exhibits the influence of grain boundary formation in the *** radiative recombination and quenching observed in optical characterization by using photoluminescence spectrum(PL) and the shift in the band gap estimated from UV-visible diffused reflectance spectrum corroborate the grain boundary *** spectrum and the morphological analysis by using a field emission scanning electron microscope(FESEM) also indicate the formation of grain *** compositional analysis by using energy dispersive x-ray spectrum(EDAX) confirms Fe in the SnO_(2) *** conductivity studies exhibit that the impendence increases with doping concentration increasing and the loss factor decreases at high frequencies with doping concentration increasing,which makes the Sn_(1-x)Fe_(x)O_(2) a potential candidate for device applications.

关键词： sol-gel compressive strain grain boundary AC conductivity

H2 production by ethanol decomposition with a gliding arc discharge plasma reactor

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Frontiers of Chemical Science and Engineering 2013年第2期7卷 145-153页

作者： Baowei WANG Wenjie GE Yijun LV Wenjuan YAN Key Laboratory for Green Chemical technology of the Ministry of Education School of Chemical Engineering and Technology Tianjin University Tianjin 300072 China

A gliding arc discharge （grd） reactor was used to decompose ethanol into primarily H2 and CO with small amounts of CH4, C2H2, C2H4, and C2H6. The ethanol concentration, electrode gap, input voltage and Ar flow rate all affected the conversion of ethanol with results ranging from 40.7% to 58.0%. Interestingly, for all experimental conditions the SH2/Sco selectivity ratio was quite stable at around 1.03. The mechanism for the decomposition of ethanol is also described.

关键词： gliding arc discharge ethanol hydrogen,decomposition plasma

Enhancement of luminescence intensity and spectroscopic analysis of Eu^(3+) activated and Li^+ charge-compensated Bi_2O_3 nanophosphors for solid-state lighting

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Journal of Rare Earths 2019年第4期37卷 356-364页

作者： S.Ashwini S.C.Prashantha RamachANDra Naik H.Nagabhushana Department of Physics Channabasaveshwara Institute of Technology Research Center Department of Science East West Institute of Technology Department of Physics New Horizon College of Engineering CNR Rao Center for Advanced Materials Tumkur University

The present work reports the synthesis, characterization, photoluminescence and photocatalytic activity of Eu^(3+)(1 mol%-11 mol%) doped and Li^+(0.5 mol%-5 mol%) co-doped Bi_2 O_3 nanophosphors(NPs) by sonochemical method. The average particle size was estimated using powder X-ray diffraction(PXRD)and transmission electron microscopy(TEM) and is found to be in the range of 30-35 nm. The scanning electron microscopy(SEM) images were highly dependent on sonication time and concentration of epigallocatechin gallate(EGCG) bio-surfactant. The energy gap of doped and co-doped Bi_2 O_3 nanophosphors was estimated using Kubelka-Munk(K-M) function and is found to be in the range of2.9-3.08 eV. The effect of Li+ co-doping on luminescence of optimized Bi_2 O_3:Eu^(3+) was studied and is found about more than 3 fold enhancement of emission intensity. Judd-Ofelt parameters(Ω_2, Ω_4 and Ω_6).transition probabilities(A_T), quantum efficiency(η), luminescence lifetime(τ_(rad)), color chromaticity coordinates(CIE) and correlated color temperature(CCT) values were estimated from the emission spectra and are discussed in detail. The estimated CIE chromaticity co-ordinates are very close to the NTSC(National Television Standard Committee) standard value of red emission. The synthesized NPs show excellent photocatalytic activity of acid red-88 under UV-light irradiation, which can degrade 98.1% in60 min. The decreasing electron-hole pair recombination rate with quick electron transfer ability is predominantly ascribed to the balance between crystallite size, morphology, band gap, defects, surface area, etc. These results show a light for the use of sonochemical route of Bi_2 O_3:Eu^(3+):Li^+ in solid state display and photocatalytic applications.

关键词： Bi2O3:Eu3+:Li+ Sonochemical Photoluminescence CIE n CCT Photocatalysis Rare earths

Ionic liquid-assisted hydrothermal synthesis of SnS nanoparticles:Electrode materials for lithium batteries,photoluminescence and photocatalytic activities

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Journal of Energy Chemistry 2018年第3期27卷 806-812页

作者： K.N.Manukumar G.Nagaraju Brij Kishore C.Madhu N.Munichandraiah Department of Chemistry Siddaganga Institute of TechnologyTumkurKarnatakaIndia Department of Inorganic and Physical Chemistry Indian Institute of ScienceBangaloreKarnatakaIndiac Department of Physics.Siddaganga Institute of technology.Tumkur KarnatakaIndia

Tin mono-sulphide（Sn S） nanoparticles（Nps） have been successfully synthesised through ionic liquid assisted hydrothermal method using hydrated tin（II） chloride as a precursor, thiourea as sulphur source precursors using 2-Methoxy ethyl methyl imidazolium methane sulfonate ionic liquid as co-solvent. The Reitveld refinement on powder X-ray diffraction（PXRD） confirmed the presence of orthorhombic Sn S structure as major phase along with traces amount of Sn S2 and Sn2 S3. Diffuse reflectance spectrum studies revealed the energy band gap around 1.38 e V. TEM images confirmed the Sn S Nps with average particle size of 40 nm and HRTEM suggest good crystallinity. The electrochemical property for lithium storage behaviour shows an initial discharge capacity of 658 m Ah/g and it retains discharge capacity of 426 m Ah/g for 16 cycles, at current density 100 m A/g. The obtained results indicate that Sn S Nps to be one of the possible promising anode materials for next generation Lithium batteries. Photoluminescence study of Sn S Nps shows a strong green emission at 530 nm. Sn S Nps were also tested for the photocatalytic adsorption of methylene blue and Rhodamine B.

关键词： Nanoparticles Lithium-ion batteries Ionic liquids Ionothermal

GRA-Based Approach to PID Parameter Tuning for Closed-Loop Servo Systems 25th

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GRA-Based Approach to PID Parameter Tuning for Closed-Loop S...

Recent developments in self-powered smart chemical sensors for wearable electronics

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作者： PENG An-hua Engineering Training Center Huaihai Institute of Technology

ISBN: (纸本)9781467355339

Performances of servo system are the key factors, which determine the best process accuracy and efficiency that computer-numerical-control （CNC） machine tools can reach, and therefore it is absolutely necessary to conduct dynamic simulation and to design a corrector after static design. PID （proportion-integral-differential）-controller as a correction device is adopted. Overshoot of closed-loop servo system of the machine tool remains still as high as 13.27%, after corrected by proportion-integral-differential （PID） controller, whose parameters are tuned only with critical one fourth attenuation curve. Therefore PID controller parameters merely based on critical oscillation are required to be further optimized by grey relational analysis （GRA） combined with orthogonal experiment, in which controllable factor values are assigned according to the single-factor experiment results, and the two examined indexes, overshoot and rise time, are converted into one index through analysis of grey relational grade. In MATLAB software, a simulation model was created, and the simulation results to unit step response are 3.03% in overshoot and 0.1960 second in rise time, reflecting better dynamic performances, both smoothness and rapidity, and showing that the method is effective.

关键词： Servo System PID Single-factor experiment Orthogonal Experiment Grey Relational Grade (grd)

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Nano Research 2021年第11期14卷 3669-3689页

作者： Aaryashree Surjit Sahoo Pravin Walke Saroj Kumar Nayak Chandra Sekhar Rout Dattatray J.Late Shibaura Institute of technology Koto-CityTokyo135-8548Japan School of Basic Sciences Indian Institute of Technology BhubaneswarJatniOdisha752050India National Centre for Nanosciences and Nanotechnology University of MumbaiMumbaiMaharashtra400098India Centre for Nano and Material Sciences Jain UniversityRamanagaramBangalore562112India Centre for Nanoscience&Nanotechnology Amity University MaharashtraMumbai-Pune ExpresswayBhatanPost—SomathnePanvelMaharashtra410206India

The next generation of electronics technology is purely going to be based on wearable sensing systems. Wearable electronic sensors that can operate in a continuous and sustainable manner without the need of an external power sources, are essential for portable and mobile electronic applications. In this review article, the recent progress and advantages of wearable self-powered smart chemical sensors systems for wearable electronics are presented. An overview of various modes of energy conversion and storage technologies for self-powered devices is provided. Self-powered chemical sensors (SPCS) systems with integrated energy units are then discussed, separated as solar cell-based SPCS, triboelectric nano-generators based SPCS, piezoelectric nano-generators based SPCS, energy storage device based SPCS, and thermal energy-based SPCS. Finally, the outlook on future prospects of wearable chemical sensors in self-powered sensing systems is addressed.

关键词： chemical sensors self-powered wearable electronics smart sensors

Rational design of monovalent ions （Li,Na,K） co-doped ZnAl2O4:Eu3+ nanocrystals enabling versatile robust latent fingerprint visualization

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Journal of Rare Earths 2019年第7期37卷 699-705页

作者： F.Femila Komahal H.Nagabhushana R.B.Basavaraj G.P.Darshan Hajeebaba K.Inamdar S.C.Sharma B.Daruka Prasad C.N.R.Rao Centre for Advanced Materials Research Tumkur UniversityTumkur-572 103India Department of Physics Acharya Institute of Graduate StudiesBangalore-560 107India Department of Physics J.B.Institute of Engineering&Technology(Autonomous)MoinabadPR.DistrictHyderabad-75India National Assessment and Accreditation Council Bangalore 560 072India Department of Physics B.M.S.Institute of TechnologyVisveswaraya Technological UniversityBangalore 560064India

Alkali metal ions(M+ = Na+,Li+,K+) co-doped ZnAl2O4:Eu3+(5 mol%)(ZAE) nanopowders(NPs) were prepared via solution combustion route using Mimosa pudica(MP) leaves extract as a fuel. PXRD results of co-doped samples enhance the crystallinity and grain growth. Photoluminescence(PL) of the prepared ZAE and ZAE:M+(M+ = Na+, Li+, K+) NPs shows intense emission peaks in the range of 550-750 nm and ascribed to 5D0→7FJ(J=0-4) transitions of Eu3+ ions, respectively. A 2-fold enhancement in PL intensity was observed in Li+ co-doped samples. The optimized ZnAl2O4:Eu3+(5 mol%), Li+(1 wt%)(ZAEL)NPs were used to visualize LFPs on various porous, semi-porous and non-porous surfaces through robust powder dusting technique. The visualized latent fingerprints(LFPs) reveal well defined level 1-3 ridge characteristics under several tests such as fingerprint aging and fresh water treatment for various time durations. The obtained results clearly evidence that the prepared NPs are quite useful for multifunctional applications such as advanced forensic and solid state lightning.

关键词： Photoluminescence Latent fingerprints Solid state lightning Alkali metal ions Rare earths