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RISS 인기검색어
- 검색키워드
- 저자 : K.M. Parida (검색결과 2 건)
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Morphological instabilities in argon ion sputtered CoSi binary mixtures
B.K. Parida,M. Ranjan,S. Sarkar 한국물리학회 2018 Current Applied Physics Vol.18 No.9
Nanopattern formation on CoxSi1−x (0 < x < 1) surfaces has been studied under a range of low energy Ar+ ion bombardment at oblique incidence and also at varying ion fluences. Our study shows a clear morphological change for the nanostructures depending upon the incident beam energies and binary mixture stoichiometries. From an initial smoothening regime, well-ordered nanoscale ripples form at sub-keV energies at ion fluences ∼ 1018 ions cm−2. These ripples further transform into micrometer-sized ellipsoidal structures upon increasing the ion energy from 500 eV to 1200 eV. The wavelengths of the nanostructures increase with ion fluence obeying a power law behaviour f 0.123, where f is the fluence. For higher values of Co content, the rippled morphology is gradually replaced by bug-like hierarchical structures.
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Dramatic enhancement of catalytic activity over transition metal substituted hematite
Gajendra K. Pradhan,K.M. Parida 한국공업화학회 2012 Journal of Industrial and Engineering Chemistry Vol.18 No.5
This paper reports the fabrication of hematite (a-Fe2O3) and its mixed oxides (a-Fe2-xO3Cux, a-Fe2-xO3Cox, a-Fe2-xO3Nix) by hydrothermal technique without using any surface directing agent or capping agent. The products were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The synthesized catalysts were screening for epoxidation of cyclohexene and trans-stilbene. Cu based mixed oxide shows almost two-fold higher conversion than pure hematite. Although we have not got significant conversion, but the epoxidation of the above two substrate over the hematite and its mixed oxide is new-fangled.
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