分类: 核科学技术 >> 核材料与工艺技术 提交时间: 2023-06-18 合作期刊: 《Nuclear Science and Techniques》
摘要: Pulse radiolysis studies of the reactions between balofloxacin (BFX) and eaq‒ , hydroxyl radical (˙OH), and N3 were carried out to investigate the photosensitive toxicity of BFX. The BFX radical anion formed in the reaction of BFX with eaq‒ was located at 380 nm. The transient species formed in the reaction of BFX with ˙OH radical were located in the region of 370 nm to 580 nm, with a maximum max at 390 nm. The BFX radical cation was obtained by reacting BFX with N3˙, and showed an absorption band at around 365 nm. The UV-Vis absorption of the BFX was found to be clearly dependent on pH. The pKa value of BFX was estimated to be 6.00.2. Under neutral conditions, the rate constants of BFX reacting with N3˙ and eaq‒ were determined to be 1.31010 dm3mol‒1s‒1 and 1.41010 dm3mol‒1s‒1, respectively.
分类: 物理学 >> 凝聚态:结构、力学和热性能 提交时间: 2017-03-26
摘要: Thermal aging effects on surface of 2.5 MeV Fe ion irradiated Fe-0.6%Cu alloy were investigated using positron annihilation techniques. The samples were irradiated at 573 K to a dose of 0.1 dpa. Their thermal aging was performed at 573 K for 5, 50, and 100 h. From the results of Doppler broadening measurement, an obvious trough could be seen in near surface region from the S parameters and inflection point form at S-W curves. This indicates changes in the annihilation mechanism of positrons in surface region after thermal aging. Coincident Doppler broadening indicates that the density of Cu precipitates in the thermal aged samples decreased, due to recovery of the vacancies. Keywords Fe-Cu alloy; Positron annihilation; Irradiation; Thermal aging