01316nas a2200181 4500008004100000022001400041245012500055210006900180260007100249300001600320490000800336520056000344100002800904700001700932700002800949700003000977856012701007 2008 eng d a1932-744700aHighly selective catalytic hydrogenation of arenes using rhodium nanoparticles supported on multiwalled carbon nanotubes0 aHighly selective catalytic hydrogenation of arenes using rhodium a1155 16TH ST, NW, WASHINGTON, DC 20036 USAbAMER CHEMICAL SOCcSEP a13317-133190 v1123 a

Rhodium nanoparticles (RhNPs; 4.9 +/- 0.4 nm) supported on multiwalled carbon nanotubes (Rh/MWNT), prepared by simple microwave treatment, show a remarkable catalytic activity for arene hydrogenation with enhanced turnover numbers of similar to 10000; disubstituted arenes show selective conversion of thermodynamically less favorable cis products (>80%). A series of arenes have been tested using various Rh-based catalysts, and a comparison of the results with that of reported rhodium catalysts shows unique selectivity under mild conditions.

1 aKakade, Bhalchandra, A.1 aSahoo, Suman1 aHalligudi, Shivappa, B.1 aPillai, Vijayamohanan, K. uhttps://library.ncl.res.in/content/highly-selective-catalytic-hydrogenation-arenes-using-rhodium-nanoparticles-supported-002167nas a2200193 4500008004100000022001400041245010500055210006900160260010600229300001200335490000700347520136800354100002801722700002001750700002501770700002301795700003001818856012501848 2008 eng d a0008-622300aHigh-purity synthesis of scrolled mats of multi-walled carbon nanotubes using temperature modulation0 aHighpurity synthesis of scrolled mats of multiwalled carbon nano aTHE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLANDbPERGAMON-ELSEVIER SCIENCE LTDcAPR a567-5760 v463 a

Felt-like mats (6-7 mu m thick) of multimalled carbon nanotubes wrapped into scrolls have been synthesized by chemical vapor deposition from a toluene-ferrocene mixture using a temperature ramp from 680 degrees C to 550 degrees C in hydrogen-argon atmosphere. Thermogravimetric analysis reveals a very low catalyst content of ca. 1.25 wt% in the as-synthesized sample while, X-ray photo electron and Raman spectroscopies suggest the results matching with that of multiwalled carbon nanotubes. Considering, different time scales of various reactions and the diffusion of different reactants and products a tentative base growth mechanism has been proposed as per the available characterization data in conjunction with possible scrolling effects. Thermal expansion effects could explain a tentative mechanism for rolling action of sheets. Interestingly, electrical conductivity measurements as a function of temperature suggest a semiconducting behavior, despite being governed by different electron transport mechanisms with activation energies of 0.33 and 1.03 meV corresponding to two temperature ranges respectively. Cyclic voltammetry and electrochemical impedance analysis show a reversible redox behavior due to very low catalyst content and an irreversible etching of the Fe catalyst after acid treatment. (C) 2007 Elsevier Ltd. All rights reserved.

1 aKakade, Bhalchandra, A.1 aAllouche, Hatem1 aMahima, Subhramanyam1 aSathe, Bhaskar, R.1 aPillai, Vijayamohanan, K. uhttps://library.ncl.res.in/content/high-purity-synthesis-scrolled-mats-multi-walled-carbon-nanotubes-using-temperature-001822nas a2200265 4500008004100000022001400041245010300055210006900158260012500227300001100352490000700363520081100370653002101181653002001202653001901222653001501241100002801256700003001284700002401314700002501338700002201363700002301385700002001408856012801428 2010 eng d a0003-695100aHigh current density, low threshold field emission from functionalized carbon nanotube bucky paper0 aHigh current density low threshold field emission from functiona aCIRCULATION & FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USAbAMER INST PHYSICScAUG a0731020 v973 a

Field emission studies of bucky paper of multiwalled carbon nanotubes (MWNTs), prepared after microwave (MW) assisted acid functionalization are reported along with a comparison with that of ``as-grown'' sample. MW treated bucky papers reveal an interesting linear field emission behavior in Fowler-Nordheim plot. The field emission currents at preset value are found to be remarkably stable over a period of more than 3 h sustaining current densities of 4.9 mA/cm(2) and 8.5 mA/cm(2) for ``as-grown'' and functionalized sample, respectively. The enhancement in the field emission due to functionalization has been discussed in terms of tip opening and defect induced charge transport caused by intershell and intertubular interaction. (C) 2010 American Institute of Physics. [doi:10.1063/1.3479049]

10aCarbon nanotubes10acurrent density10afield emission10afullerenes1 aKakade, Bhalchandra, A.1 aPillai, Vijayamohanan, K.1 aLate, Dattatray, J.1 aChavan, Padmakar, G.1 aSheini, Farid, J.1 aMore, Mahendra, A.1 aJoag, Dilip, S. uhttps://library.ncl.res.in/content/high-current-density-low-threshold-field-emission-functionalized-carbon-nanotube-bucky-0