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Now showing items 2261-2280 of 2767

An approach to the synthesis of organically templated open-framework metal sulfates by the amine-sulfate route

Choudhury, Amitava; Krishnamoorthy, Jayaraman; Rao, C N R (Royal Society Chemistry, 2001-12-21)

The first organically templated cadmium sulfates, [C4N2H12][CdCl2SO4].H2O and [C4N2H12](4)[Cd3Cl10(SO4)(2)-(H2O)]. 3H(2)O, consisting of infinite linear chains and a quasi-2D layer formed by strip-like units respectively, ...
Synthesis and characterization of submicron-sized mesoporous aluminosilicate spheres

Gundiah, Gautam; Eswaramoorthy, M; Neeraj, S; Natarajan, Srinivasan; Rao, C N R (Indian Academy of Sciences, 2001-06)

Mesoporous aluminosilicate spheres of 0.3-0.4 mum diameter, with different Si/Al ratios, have been prepared by surfactant templating. Surface area of these mated als is in the 510-970 m(2) g(-1) range and pore diameter in ...
Electron-Hole Asymmetry in the Rare-Earth Manganates: A Comparative Study of the Hole- and the Electron-Doped Materials

Sarathy, K Vijaya; Vanitha, P V; Seshadri, Ram; Cheetham, A K; Rao, C N R (American Chemical Society, 2001-03)

Properties of the hole-doped Ln(1-x)A(x)MnO(3) (Ln = rare earth, A = alkaline earth, x < 0.5) are compared with those of the electron-doped compositions (x > 0.5). Charge ordering is the dominant interaction in the latter ...
An investigation of the re-entrant ferromagnetic transition in rare earth manganates in the regime of competing charge-ordering and ferromagnetic interactions

Vanitha, P V; Rao, C N R (IOP Publishing Ltd, 2001-12-17)

Manganates of the compositions Nd0.5-xLaxCa0.5MnO3 and Pr0.5-xLaxCa0.5 MnO3, with the average A-site cation radius, <r(A)>, in the range 1.17-1.20 Angstrom, are charge ordered at ordinary temperatures (T-CO similar to 240 ...
Surface Enrichment in Alcohol-Water Mixtures

Raina, G; Kulkarni, G U; Rao, C N R (American Chemical Society, 2001-11-15)

Molecular beams generated from the vapors above the surfaces of alcohol-water mixtures have been examined by mass spectrometry. The alcohols examined are methanol, ethanol, n-propanol, and n-butanol. The variation of the ...
Basic building units, self-assembly and crystallization in the formation of complex inorganic open architectures

Rao, C N R (Indian Academy of Sciences, 2001-10)

Careful investigations of open-framework metal phosphates reveal that the formation of these complex architectures is likely to involve a process wherein one-dimensional ladders or chains, and possibly zero-dimensional ...
Open-Framework Cadmium Succinates of Different Dimensionalities

Vaidhyanathan, R; Natarajan, Srinivasan; Rao, C N R (American Chemical Society, 2002-09-07)

Open-framework cadmium succinates, [CN3H6](2)[Cd-2(C4H4O4)(CI)(2)], I; [CN3H6](2)[Cd(C4H4O4)(2)], II; Cd-2(C4H4O4)(2)(C4N2H8)-(H2O)(3), III; [C4N2H12][Cd-2(C4H4O4)(3)].4H(2)O, IV; Cd(C4H4O4)(H2O)(2), V; and Cd-3(C4H4O4)( ...
Transformations of two-dimensional layered zinc phosphates to three-dimensional and one-dimensional structures

Choudhury, Amitava; Neeraj, S; Natarajan, Srinivasan; Rao, C N R (Royal Society of Chemistry, 2002)

Transformations of the layered zinc phosphates of the compositions [C6N4H22](0.5) [Zn-2 (HPO4)(3)], I, [C3N2H12][Zn-2 (HPO4)(3)], II and [C3N2OH12][Zn-2 (HPO4)(3)], III, containing triethylenetetramine, 1,3-diaminopropane, ...
An open-framework zincoborate formed by Zn6B12O24 clusters

Choudhury, Amitava; Neeraj, S; Natarajan, Srinivasan; Rao, C N R (Royal Society of Chemistry, 2002-04-07)

A novel zincoborate, Zn(H2O)B2O4.xH(2)O (xapproximate to0.12), I, with open architecture has been synthesized hydrothermally. The 3-dimensional structure is built up of Zn6B12O24 clusters formed by the capping of the ...
Carbon Nanotubes from Organometallic Precursors

Rao, C N R; Govindaraj, A (American Chemical Society, 2002-12)

Multiwalled as well as single-walled carbon nanotubes are conveniently prepared by the pyrolysis of organometallic precursors such as metallocenes and phthalocyanines in a reducing atmosphere. More importantly, pyrolysis ...
Nanostructured advanced materials. Perspectives and directions

Jortner, Joshua; Rao, C N R (International Union Pure Applied Chemistry, 2002-09)

A focus of frontline interdisciplinary research today is the development of the conceptual framework and the experimental background of the science of nanostructured materials and the perspectives of its technological ...
Organometallic precursor route to carbon nanotubes

Govindaraj, A; Rao, C N R (International Union Pure Applied Chemistry, 2002-09)

Multi-walled as well as single-walled carbon nanotubes are conveniently prepared by the pyrolysis of organometallic precursors, such as metallocenes and phthalocyanines, in a reducing atmosphere. Pyrolysis of organometallics ...
Phase separation and segregation in rare earth manganates: the experimental situation

Rao, C N R; Vanitha, P V (Pergamon-Elsevier Science Ltd, 2002-02)

Rare earth manganates of the general formula, Ln(1-x)A(x)MnO(3) (Ln = rare earth, A = alkaline earth) exhibit phase separation due to the occurrence of tiny clusters or small nanometric regions of one type of magnetic phase ...
Novel Effects of Metal Ion Chelation on the Properties of Lipoic Acid-Capped Ag and Au Nanoparticles

Berchmans, Sheela; Thomas, P John; Rao, C N R (American Chemical Society, 2002-05-09)

The effects of the interactions of metal ions with lipoic acid-capped Ag and Au nanoparticles have been studied by the combined use of electronic absorption spectroscopy and transmission electron microscopy. Three types ...
Barkhausen jumps and related magnetic properties of iron nanowires encapsulated in aligned carbon nanotube bundles

Satishkumar, B C; Govindaraj, A; Vanitha, P V; Raychaudhuri, Arup K; Rao, C N R (Elsevier Science BV, 2002-08-19)

Iron nanowires encapsulated in aligned carbon nanotube bundles show interesting magnetic properties. Besides the increased coercivity, Barkhausen jumps with 5 emu/g steps in magnetization are observed due to magnetization ...
Raman scattering in charge-ordered Pr0.63Ca0.37MnO3: Anomalous temperature dependence of linewidth

Gupta, R; Pai, G Venketeshwara; Sood, A K; Ramakrishnan, T V; Rao, C N R (EDP Sciences, 2002-06)

We report on the evolution of the Raman-active A(g) phonon modes in the charge-ordered manganite Pr0.63Ca0.37MnO3 as a function of temperature from 300 K to 25 K. Our studies reveal that the linewidths of the A(g)(2) and ...
Synthesis and characterization of silicon carbide, silicon oxynitride and silicon nitride nanowires

Gundiah, Gautam; Madhav, G V; Govindaraj, A; Seikh, Md Motin; Rao, C N R (Royal Society of Chemistry, 2002)

Several methods have been employed to synthesize SiC nanowires. The methods include heating silica gel or fumed silica with activated carbon in a reducing atmosphere, the carbon particles being produced in situ in one of ...
Single-walled carbon nanotube bundles intercalated with semiconductor nanoparticles

Nath, Manashi; Teredesai, Pallavi V; Muthu, D V S; Sood, A K; Rao, C N R (Current Science Association, 2003-10-10)

Nanoparticles of CdSe, CdS and ZnSe have been incorporated in the inter-tubular gaps of single-walled carbon nanotube (SWNT) bundles. Electron microscope, X-ray diffraction (XRD), electronic spectroscopy and Raman studies ...
Organically Templated Vanadyl Selenites with Layered Structures

Pasha, Intyaj; Choudhury, Amitava; Rao, C N R (American Chemical Society, 2003-01-27)

Two layered vanadyl selenites with the compositions, [DABCOH(2)](0.5)[((VO)-O-IV)(HSeO3)(SeO3)].H2O, I, and [enH(2)][((VO)-O-iv)(2)((VO)-O-V)O-2(SeO3)(3)]-.1.25H(2)O, II, have been prepared by the reaction of NaVO3 with ...
Amine-Templated Linear Vanadium Sulfates with Different Chain Structures

Paul, G; Choudhury, Amitava; Nagarajan, R; Rao, C N R (American Chemical Society, 2003-03-24)

Amine-templated vanadium sulfates of the formula [HN(CH2)(6)NH][((VO)-O-IV)(2)(OH)(2)(SO4)(2)].H2O, I, [H3N(CH2)(2)NH3][V-III-(OH)(SO(4)2)].H2O, I, and [H2N(CH2)(4)NH2][((VO)-O-IV)(H2O)(SO4)(2)], III, have been prepared ...

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