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非晶态金属-磷酸铝催化正庚醛和苯甲醛羟醛缩合制茉莉醛(英文)

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催化学报 2015年第2期36卷 209-215页

作者： A. Hamza n. nagaraju Catalysis Research Laboratory St. Joseph's College P.G. and Research Centre Bangalore 560027 India

Amorphous aluminophosphate(AlP) and metal-aluminophosphates(MAlPs, where M = 2.5 mol%Cu, Zn, Cr, Fe, Ce, or Zr) were prepared by coprecipitation method. Their surface properties and catalytic activity for the synthesis of jasminaldehyde through the aldol condensation of nheptanal and benzaldehyde were investigated. The nitrogen adsorption-desorption isotherms showed that the microporosity exhibited by the aluminophosphate was changed to a mesoporous and macroporous structure which depended on the metal incorporated, with a concomitant change in the surface area. Temperature-programmed desorption of nHand COrevealed that the materials possessed both acidic and basic sites. The acidic strength of the material was either increased or decreased depending on the nature of the metal. The basicity was increased compared to AlP. All the materials were X-ray amorphous and powder X-ray diffraction studies indicated the absence of metal oxide phases. The Fourier transform infrared analysis confirmed the presence of phosphate groups and also the absence of any M-O moieties in the materials. The selected organic reaction occurred only in the presence of the AlP and MAlPs. The selectivity for the jasminaldehyde product was up to 75% with a yield of 65%. The best conversion of nheptanal with a high selectivity to jasminaldehyde was obtained with FeAlP as the catalyst, and this material was characterized to have less weak acid sites and more basic sites.

关键词： Amorphous aluminophosphate Metal-aluminoposphate Surface property Acid-base bi-functional catalyst Aldol condensation Jasminaldehyde

KOH activated carbon derived from biomass-banana fibers as an efficient negative electrode in high performance asymmetric supercapacitor

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Journal of Energy Chemistry 2017年第1期26卷 56-62页

作者： ChaitraK Vinny R T Sivaraman P narendra Reddy Chunyan Hu Krishna Venkatesh Vivek C S nagaraju n Kathyayini n Department of nanobiosciences Centre for Emerging TechnologiesJain Global CampusJain UniversityJakkasandra postKanakapura TalukRamanagara DistrictBangalore Rural 562112 KarnatakaIndia naval Materials Research Laboratory DRDOAmbernathThane 421506India Department of Chemistry St.Joseph’s College P.G.Centre.46Langford RoadShanthinagarBangaloreKarnataka 560027India Research Resource Centre Visveswaraya Technological UniversityBelagaviIndia College of Chemistry Chemical Engineering and BiotechnologyDonghua UniversityShanghai 201620China national Engineering Research Center for Dyeing and Finishing of Textiles Donghua UniversityShanghai 201620China

Here we demonstrate the fabrication, electrochemical performance and application of an asymmetric supercapacitor (AS) device constructed with ss-ni(OH)(2)/MWCnTs as positive electrode and KOH activated honeycomb-like porous carbon (K-PC) derived from banana fibers as negative electrode. Initially, the electrochemical performance of hydrothermally synthesized ss-ni(OH)(2)/MWCnTs nanocomposite and K-PC was studied in a three-electrode system using 1 M KOH. These materials exhibited a specific capacitance (Cs) of 1327 Fig and 324 F/g respectively at a scan rate of 10 mV/s. Further, the AS device i.e., ss-ni(OH)(2)/MWCnTs// K-PC in 1 M KOH solution, demonstrated a Cs of 156 F/g at scan rate of 10 mV/s in a broad cell voltage of 0-2.2 V. The device demonstrated a good rate capability by maintaining a Cs of 59 F/g even at high current density (25 A/g). The device also offered high energy density of 63 Wh/kg with maximum power density of 5.2 kW/kg. The AS device exhibited excellent cycle life with 100% capacitance retention at 5000th cycle at a high current density of 25 A/g. Two AS devices connected in series were employed for powering a pair of LEDs of different colors and also a mini fan. (C) 2016 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. and Science Press. All rights reserved.

关键词： Asymmetric supercapacitor device Activated porous carbon High energy density Cyclability Power source

Catalytic role of Cu(I) species in Cu_2O/CuI supported on MWCnTs in the oxidative amidation of aryl aldehydes with 2-aminopyridines

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Chinese Journal of Catalysis 2015年第11期36卷 1825-1836页

作者： H. n. Hareesh K. U. Minchitha n. nagaraju n. Kathyayini 耆那大学纳米生物科学系新兴技术中心印度卡纳塔克邦格讷格布尔圣约学院及研究中心化学系催化研究实验室印度卡纳塔克邦班加罗尔

Cu2O and Cul were supported on multiwalled carbon nanotubes （MWCnTs） using a wet impregna- tion method, and the resulting materials were fully characterized by powder X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron microscopy with energy dispersive X-ray spectroscopy, transmission electron microscopy, and temperature-programmed desorption with ammonia analysis. The results of these experiments revealed that Cu2O and CuI were deposited on the MWCnTs in the cubic and γ phases, respectively. These results also showed that the Cu-containing MWCnTs exhibited weak to strong electron-accepting （Lewis acidic） properties. The catalytic activities of these materials were studied for the synthesis of biologically significant n-（pyridin-2-yl）benzamides via the oxidative amidation of aryl aldehydes with 2-aminopyridines. The yields of the products were in the range 50%-95% with 100% selectivity. notably, the CuI/MWCnT catalyst was much more effective than the Cu2O/MWCnT catalyst with respect to the isolated yield of the product, although the latter of these two catalysts exhibited much better recyclability. A preferential interaction was observed between the polar nature of the acid-activated MWCnTs and the ionic Cu2O compared with covalent CuL The differences in these interactions had a significant impact on the rate of the nucleophilic attack of the amino group of 2-aminopyridine substrate on the carbonyl group of the aryl aldehyde.

关键词： Cuprous oxide Cuprous iodide Multiwalled carbon nanotube2-Aminopyridine Oxidative amidation

非晶态介孔FeAlP催化剂用于合成1,5-苯二氮类化合物(英文)

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催化学报 2010年第11期31卷 1321-1327页

作者： A.V.VIJAYASAnKAR S.DEEPA B.R.VEnUGOPAL n.nagaraju Department of Chemistry Catalysis Research LaboratorySt.Joseph's College Research Centre Department of Organic Chemistry Indian Institute of Science

A simple and versatile method for the synthesis of 1,5-benzodiazepines from o-phenylenediamine and ketones in the presence of solvents and under solvent-free conditions that used an amorphous mesoporous iron aluminophosphate as catalyst was *** yields with excellent selectivity were obtained with a wide variety of ketones under mild reaction *** catalyst had the advantages of ease of preparation,ease of handling,simple recovery,reusability,non toxicity,and being inexpensive.

关键词： benzodiazepine amorphous metal aluminophosphate mesoporous iron aluminophosphate o-phenylenediamine ketone solvent free synthesis

氧化铝和氧化锆催化剂上2-取代苯并咪唑和1,5-二取代苯并二氮的合成(英文)

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催化学报 2012年第3期33卷 439-446页

作者： M. REKHA A. HAMZA B. R. VEnUGOPAL n. nagaraju Catalysis Research Laboratory St. Joseph's College and Research Centre 39 Lalbagh Road Shanthinagar Bangalore 560 027 India Laboratory of Chemistry and Electrochemistry of Surfaces Facultés Universitaires Notre-Dame de la Paix Rue de Bruxelles 61 B-5000 Namur Belgium

In this study, alumina, zirconia, manganese oxide/alumina, and manganese oxide/zirconia have been investigated for their catalytic activity in the condensation reaction between o-phenylenediamine and an aldehyde or a ketone to synthesise 2-substituted benzimidazoles and 1,5-disubstituted benzodiazepines respectively. Surface area, surface acidity, and morphology of the catalysts have been analysed and correlated with their catalytic activity. The isolated yields of 2-substituted benzimidazoles and 1,5-disubstituted benzodiazepines are in the range of 30% to 95%. A good correlation between the amount of surface acid sites as well as the surface morphology of the catalysts and the catalytic activity has been observed. This method has been found to be simple and economical. The solid supports could be regenerated and reused without much loss in their activity. Further, the solid supports have been also found to be effective as general catalysts in the condensation of o-phenylenediamine with other substituted aldehydes and ketones.

关键词：取代苯并咪唑锆催化剂二取代苯氧化铝合成药物催化活性氮

Socio-Economic and Scientific Impact Created by Whitefly-Transmitted,Plant-Virus Disease Resistant Tomato Varieties in Southern India

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Journal of Integrative Agriculture 2012年第2期11卷 337-345页

作者： John Colvin n nagaraju Carlos Moreno-Leguizamon R M Govindappa T B Manjunatha Reddy S A Padmaja neena Joshi Peter M Hanson Susan E Seal V Muniyappa natural Resources Institute University of GreenwichChatham MaritimeKentME4 4TBUnited Kingdom University of Agricultural Sciences G.K.V.K.Bangalore 560065India AVRDC-The World Vegetable Center

Research carried out to assess the impact of open-pollinated Tomato leaf curl virus（ToLCV）-resistant tomatoes and hybrids on the livelihoods of resource-poor farmers in Southern India is described and *** high-yielding ToLCV-resistant tomato varieties were developed initially using conventional breeding and screening techniques involving inoculation by ToLCV-viruliferous whitefly,Bemisia *** 2003 and 2004,respectively,these varieties were released officially by the Karnataka State Seed Committee and the Indian Ministry of Agriculture through notification in the Gazette of *** 2003 to 2005,eleven seed companies bought breeder seed of the ToLCV-resistant varieties and used them to begin breeding F1 hybrids from ***-economic studies carried out to assess the benefits obtained from growing the ToLCV-resistant varieties found that farmers could gain up to 10 times the profit by growing the ToLCV-resistant varieties compared to the pre-existing ToLCV-susceptible *** of ToLCV-resistant tomatoes was also associated with reduced pesticide *** income from tomato sales was prioritised by farmers to pay for children＇s education,better nutrition and *** a joint effort with the commercial seed sector in India,a promotional field day was organised in *** well as the three ToLCV-resistant varieties,62 ToLCV-resistant hybrid tomatoes were exhibited during a farmer-field day by 17 commercial seed companies and several public *** with ToLCV-resistance are now grown widely in South India and seeds of the three open-pollinated varieties have been distributed to more than 12 *** 2007,a conservative estimate of the financial-benefit to cost of the research ratio was already more than 837：1.

关键词： Bemisia tabaci begomovirus international development tomato resistance Tomato leaf curl virus

High energy density performance of hydrothermally produced hydrous ruthenium oxide/multiwalled carbon nanotubes composite: Design of an asymmetric supercapacitor with excellent cycle life

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Journal of Energy Chemistry 2016年第4期25卷 627-635页

作者： K.Chaitra P.Sivaraman R.T.Vinny Umananda M.Bhatta n.nagaraju n.Kathyayini Department of nanobiosciences Centre for Emerging TechnologiesJain Global CampusJain UniversityJakkasandra postKanakapura TalukRamanagara District naval Materials Research Laboratory Department of Chemistry St.Joseph's College

Hydrous ruthenium oxide(h-Ru O) nanoparticles and its composite with multiwalled carbon nanotubes(h-Ru O/MWCnT) were synthesized by a simple hydrothermal method and proved to have potential application as hybrid supercapacitor *** h-Ru Oand h-Ru O/MWCnT were characterized for their physico-chemical properties by PXRD,BET surface area,Raman,SEM-EDS and TEM *** electrochemical performance of the materials were investigated,specific capacitance(Cs) of h-Ru Oand hRu O/MWCnT estimated by their cyclic voltammetric studies were found to be 604 and 1585 F/g respectively at a scan rate of 2 m V/s in the potential range 0–1.2 ***,this value was found to be nearly three times higher than that of pure h-Ru *** asymmetric supercapacitor(AS) device was fabricated by employing h-Ru O/MWCnT as the positive electrode and activated carbon as the negative *** device exhibited Cs of 61.8 F/g at a scan rate of 2 m V/***,the device showed excellent long term stability for 20,000 cycles with 88% capacitance retention at a high current density of 25 A/g.

关键词： Carbon nanotubes Hybrid composites Asymmetric supercapacitors Cycle life

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

AMS studies on a 450 km long 2216 Ma dyke from Dharwar craton, India:Implications to magma flow

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Geoscience Frontiers 2019年第5期10卷 1931-1939页

作者： E. nagaraju V. Parashuramulu Paleomagnetism Division CSIR-National Geophysical Research InstituteUppal RoadHyderabad-500007India TSMS Jr. College BaswapurPulkalSangareddy DistrictTelanganaIndia

Anisotropy of magnetic susceptibility (AMS) studies were carried out on a precisely dated (2216.0 ± 0.9 Ma),450 km long neS striking dyke in the Dharwar Craton,to determine the magma flow direction along the dyke *** order to use the imbrication of the magnetic foliation,forty eight samples were collected from 13 locations along the length of the *** studies show that AMS fabric is dominated by medium grained interstitial Ti-poor multidomain *** corrected anisotropy degree (Pj) of the samples was found to be low to moderate,between 1.007 and 1.072,which indicates primary magnetic *** magnetic ellipsoid is either triaxial,prolate or oblate and clearly defines normal,intermediate and inverse magnetic fabrics related to magma flow during the dyke *** maximum susceptibility axes (Kmax) of the AMS tensor of the dyke is predominantly inclined at low angles (no systematic variation in depth along the neS profile,indicating sub-horizontal flow even at mid crustal levels which could probably be governed by location of the focal region of the magma source (mantle plume?),flow dynamics together with the compressive stresses exerted by the overlying crust.

关键词： Anisotropy of magnetic susceptibility Dharwar craton Dyke swarms