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V. Pillai
University of Florida
13Publications
10H-index
1,101Citations
Publications 13
Newest
#1V. PillaiH-Index: 10
#2James R. KanickyH-Index: 6
Last.Dinesh O. ShahH-Index: 53
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1 CitationsSource
#1V. Pillai (UF: University of Florida)H-Index: 10
#2Dinesh O. Shah (UF: University of Florida)H-Index: 53
Magnetic nanoparticles of cobalt ferrite (CoFe204) have been synthesized using water-in-oil microemulsions consisting of water, cetyl trimethyl ammonium bromide (surfactant), n-butanol (cosurfactant), and n-octane (oil). Precursor hydroxides were precipitated in the aqueous cores of water-in-oil microemulsions and these were then separated and calcined to give the magnetic oxide. X-ray diffraction confirmed the formation of phase pure cobalt ferrite. These nanoparticles were less than 50 nm in s...
348 CitationsSource
#1V. PillaiH-Index: 10
#2Dinesh O. ShahH-Index: 53
41 Citations
#1V. ChhabraH-Index: 6
#2V. PillaiH-Index: 10
Last.Dinesh O. ShahH-Index: 53
view all 5 authors...
Nanophase Ti02 particles, with typical particle sizes in the range of 20-50 nm, have been synthesized using a microemulsion-mediated process. In this process, the aqueous cores ofwater/TritonX-100/exanol/ cyclohexane microemulsions have been used as constrained microreactors for the precipitation of precursor titanium hydroxide. The hydroxide particles thus formed were separated, dried, and calcined at different temperatures to form nanoparticles of TiO2. In order to see the phase transition tem...
144 CitationsSource
#1V. Pillai (UF: University of Florida)H-Index: 10
#2P. Kumar (UF: University of Florida)H-Index: 10
Last.Dinesh O. Shah (UF: University of Florida)H-Index: 53
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I. II. III. IV. V. ABSTRACT Water-in-oil microemulsions have been used for the synthesis of a variety of nano- particles since the technique was first introduced in 1982. In this paper we have reviewed several articles pertaining to the synthesis of nanoparticles in microemulsions and described in some detail our research efforts in the past decade in the field of synthesis of nanoparticles of silver halides, superconductors and magnetic materials using water- in-oil microemulsions as nano-react...
188 CitationsSource
#1Sunita Hingorani (UF: University of Florida)H-Index: 4
#2V. Pillai (UF: University of Florida)H-Index: 10
Last.Dinesh O. Shah (UF: University of Florida)H-Index: 53
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Abstract This paper describes a microemulsion-mediated synthesis of zinc oxide nanoparticles for varistor studies and possible applications. These ultrafine polycrystalline ZnO nanoparticles have size ranging from 5–40 nm ESD. The microstructure, high density and electrical conductivity of sintered disks of pure and doped ZnO nanoparticles resulting from clean interfaces of particles and scaled down size of grains are found to result in a higher critical electric field and a higher coefficient o...
137 CitationsSource
#1V. Pillai (UF: University of Florida)H-Index: 10
#2P. Kumar (UF: University of Florida)H-Index: 10
Last.Dinesh O. Shah (UF: University of Florida)H-Index: 53
view all 4 authors...
Abstract Nanoparticles of barium ferrite (BaFe 12 O 19 ) were synthesized using a novel method called microemulsion processing. In this process, the aqueous cores (typically 5–25 nm in size) of water—cetyltrimethylammonium bromide— n -butanol—octane microemulsions were used as constrained microreactors for the co-precipitation of precursor carbonates (typically 5–15 nm in size). The carbonates thus formed were separated, dried and calcined to form nanoparticles (less than 100 nm) of barium ferri...
100 CitationsSource
#1P. Kumar (UF: University of Florida)H-Index: 10
#2V. Pillai (UF: University of Florida)H-Index: 10
Last.Dinesh O. Shah (UF: University of Florida)H-Index: 53
view all 4 authors...
Abstract We describe a new technique for the synthesis of ultra-homogeneous nanoparticles of precursor oxalate powders by coprecipitation in the aqueous cores of water-in-oil microemulsions for the preparation of YBa2Cu3O7−x (1-2-3) oxide superconductors. This novel technique ensures uniform mixing of cations down to the scale of 10 nm. This ultrafine powder results in phase pure “1-2-3” oxide superconducting material of almost theoretical density and > 93% Meissner shielding expected from an id...
23 CitationsSource
#1P. Kumar (UF: University of Florida)H-Index: 10
#2V. Pillai (UF: University of Florida)H-Index: 10
Last.Dinesh O. Shah (UF: University of Florida)H-Index: 53
view all 3 authors...
We describe a new technique for the synthesis of ultrahomogeneous nanoparticles of precursor oxalate powder by coprecipitation in the aqueous core of a water‐in‐oil microemulsion for the preparation of Bi‐Pb‐Sr‐Ca‐Cu‐O (2223) oxide superconductor. This process ensures a uniform mixing of metal cations down to a scale of at least 10 nm. This finely dispersed precursor powder results in phase pure (2223) oxide superconductor after proper heat treatment.
28 CitationsSource
#1P. Kumar (UF: University of Florida)H-Index: 10
#2V. Pillai (UF: University of Florida)H-Index: 10
Last.Dinesh O. Shah (UF: University of Florida)H-Index: 53
view all 3 authors...
Abstract The YBa 2 Cu 4 O 8 , 124, superconductor was prepared from the coprecipitated oxalate precursor powder. Almost complete (>99.9%) precipitation of the cations as oxalates is achieved from concentrated acetic acid medium. Firing at 780°C under atmospheric oxygen pressure yielded pure phase YBa 2 Cu 4 O 8 superconducting material with T c ∼ 81 K. This material is quite stable upto 840°C. Further firig at 860°C it transforms to YBa 2 Cu 3 O 7-x .
6 CitationsSource
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