title: Organized and highly dispersed growth of MnO2 nano-rods by sonochemical hydrolysis of Mn3acetate.
abstract: Highly dispersed and non-agglomerated alpha-MnO(2) nano-needles of dimensions 20-30 nm have been synthesized by the application of ultrasound radiation on the aqueous solution consisting of manganese(3)acetate close to neutral pH followed by mild drying. With a similar reaction system, hot hydrolysis (non-sonochemical process) produced beta-MnO(2) nano-rods of length 100-200 nm but with high degree agglomeration. Sonochemical cavitation phenomenon is suggested to have a pronounced effect for the formation of special phase and morphology. The effect is proved by the difference in the intermediate products which has difference in crystalinity and phase-purity. The intermediate phases are identified to be single-phase gamma-MnOOH for the non-sonochemical reaction and mixture of gamma-MnOOH, alpha-MnO(2) and beta-MnO(2) for the sonochemical products.
authors.affiliation: Division of Material Science and Engineering, Yonsei University, Seodaemoon-gu, Seoul, Republic of Korea.
authors.forename: V Ganesh
authors.initials: VG
authors.lastname: Kumar
authors.forename: Kwang Bum
authors.initials: KB
authors.lastname: Kim
mesh_terms: D006863:Hydrogen-Ion Concentration; D006868:Hydrolysis; D006885:Hydroxybutyrates / Q000737:chemistry*; D007700:Kinetics; D008345:Manganese; D017895:Manganese Compounds / Q000737:chemistry*; D046529:Microscopy, Electron, Transmission; D036103:Nanotechnology; D010087:Oxides / Q000737:chemistry*; D010422:Pentanones / Q000737:chemistry*; D010777:Photochemistry; D011208:Powders; D013010:Sonication; D013696:Temperature; D014465:Ultrasonics; D014961:X-Ray Diffraction
chemical_list: D006885:Hydroxybutyrates; D017895:Manganese Compounds; D010087:Oxides; D010422:Pentanones; D011208:Powders; C049529:acetyl acetonate; D008345:Manganese; C016552:manganese dioxide