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RISS 인기검색어
- 검색키워드
- 저자 : Bhoraskar, V.N. (검색결과 3 건)
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Moon Dal-Ho,Chavan Vivek,Bhoraskar Vasant,Jeong Yeong Hoon,Park Jung Ho,Suh Su-Jeong,Hong Seung-Woo 한국물리학회 2023 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.82 No.11
A thin coating of thorium on aluminium substrates with the areal density of 110 to 130 μg/cm2 is developed over a circular area of 22 mm diameter by using the electrodeposition method. An electrodeposition system is fabricated to consist of three components; an anode made of a platinum mesh, a cylindrical-shape vessel to contain the thorium solution, and a cathode in the form of a circular aluminium plate. The aluminium plate is mounted horizontally, and the platinum mesh is connected to an axial rod of an electric motor, mounted vertically and normal to the plane of the aluminium. The electrolyte solution is prepared by dissolving a known-weight thorium nitrate powder in 0.8 M HNO3 and isopropanol. The system is operated either in constant voltage (CV) or constant current (CC) mode. Under the electric feld between the anode and cathode, thorium ions were deposited on the aluminium substrate mounted on the cathode. In the CV mode at 320, 360, and 400 V and in the CC mode at 15 mA, thorium flms were formed over a circular area of the aluminium substrate. The areal density of thorium coating was measured by detecting emitted alpha particles. The areal density of thorium varied from 80 to 130 μg/ cm2 by changing the deposition time from 10 to 60 min. The results from the CV mode and CC mode are compared, and the radial dependence in the measured areal density is discussed for diferent modes of the electric feld. The developed thorium coatings are to be used in the in-house development of particle detectors, fast neutron converters, targets for thorium fssion experiments, and other purposes.
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Patole, S.P.,Kim, H.I.,Jung, J.H.,Patole, A.S.,Kim, H.J.,Han, I.T.,Bhoraskar, V.N.,Yoo, J.B. Pergamon Press ; Elsevier Science Ltd 2011 Carbon Vol.49 No.11
Aligned carbon nanotubes (CNTs) were grown on an aluminum foil laminated on a flexible stainless steel (SS) substrate. Lamination was carried out under a pressure of 10MPa with simultaneously heating at 400<SUP>o</SUP>C. The laminated Al foil was spray-coated with an iron chloride catalyst precursor solution and the CNTs were grown using water-assisted chemical vapor deposition at 810<SUP>o</SUP>C. The CNTs grew as vertically aligned forests, approximately 600μm in height, within 600s without crumpling of the Al foil. The Al foil acts as a sacrificial barrier layer to grow the CNTs. The CNTs had 2-30 walls with an inner diameter of 3-8nm. Thermogravimetric and field emission analysis of the CNTs revealed a degradation temperature and turn-on field of 643.5<SUP>o</SUP>C and 0.46V/μm, respectively. Transmission electron microscopy and X-ray photoelectron spectroscopy were used to analyze the Al-SS interface and chemical states. After removing the CNTs, the flexible SS substrate could be cleaned, recoated with Al and reused for CNT growth. Overall, this process is a repeatable and continuous roll-to-roll processable method that can be scaled up for industrial production.
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In Eun Jin,Min Kyung Joo,Bak Sang-In,Kim Do Yoon,함철민,Shim Chungbo,Zhou Yujie,Hong Seung-Woo,Park Tae-Sun,Shin Jae Won,Bhoraskar V. N. 한국물리학회 2020 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.77 No.9
The cross sections of 89Y(n,3n)87m,87gY and 209Bi(n,4n)206Bi reactions at a neutron energy of 30 MeV are measured by making use of neutron beams of continuous energy spectra and a subtraction method. By impinging proton beams of 30 and 35 MeV to a thick beryllium target, neutron beams of continuous and broad energy spectra are produced and are guided to Y and Bi sample targets. The difference between the two neutron spectra generated by two neighboring proton energies is found to be peaked in a narrow energy range and thus can be regarded as quasi-monoenergetic, which can be used to extract (n,xn) cross sections. The uncertainty in the neutron fluence is reduced by analyzing the activities of aluminum and niobium reference samples placed on top of the Y and Bi samples. The use of a subtraction method by employing neutron beams of continuous energy spectra gives us the 89Y(n,3n)87m,87gY and 209Bi(n,4n)206Bi cross sections in fair agreement with the existing experimental data and nuclear data libraries.
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