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- 저자 : Yoshinori Tokoi (검색결과 1 건)
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Effect of energy deposition on TiO2 nanosized powder synthesized by pulsed wire discharge
Yoshinori Tokoi,Tsuneo Suzuki,Tadachika Nakayama,Hisayuki Suematsu,Futao Kaneko,Koichi Niihara 한국물리학회 2009 Current Applied Physics Vol.9 No.3
Titanium dioxide (TiO2) nanosized powder was synthesized by pulsed wire discharge (PWD) using Ti wire in O2 gas. The pressure of O2 gas (P) and relative energy (K), which is defined as the ratio of the charged energy of the capacitor to the vaporization energy in the wire, were varied from 10 to 100 kPa and 4.3– 51.9, respectively. The density of the plasma/vapor (Dexp), determined by the maximum volume, was decreased with decreasing P and increasing K as observed by high-speed photography during PWD. Xray diffraction analysis confirmed that the rutile content (CR) was increased from 7 to 84 vol% with decreasing Dexp. The median diameter (D50), determined from scanning electron microscopy, was decreased from 36.5 to 10 nm with decreasing Dexp. Therefore, an increase in CR and decrease in D50 both accompany the decrease in Dexp. Titanium dioxide (TiO2) nanosized powder was synthesized by pulsed wire discharge (PWD) using Ti wire in O2 gas. The pressure of O2 gas (P) and relative energy (K), which is defined as the ratio of the charged energy of the capacitor to the vaporization energy in the wire, were varied from 10 to 100 kPa and 4.3– 51.9, respectively. The density of the plasma/vapor (Dexp), determined by the maximum volume, was decreased with decreasing P and increasing K as observed by high-speed photography during PWD. Xray diffraction analysis confirmed that the rutile content (CR) was increased from 7 to 84 vol% with decreasing Dexp. The median diameter (D50), determined from scanning electron microscopy, was decreased from 36.5 to 10 nm with decreasing Dexp. Therefore, an increase in CR and decrease in D50 both accompany the decrease in Dexp.
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