報告題目：Electrochemical Studies of Nanoparticles
報告人：Richard G. Compton（牛津大學University of Oxford）
報告時間：2019年9月24日 上午10：00
報告地點：新化工樓D區報告廳
邀請人：周一歌
報告人簡介：Richard G Compton，英國牛津大學教授，英國皇家化學學會、國際理論和應用化學聯合會（IUPAC）和國際電化學學會會士，歐洲科學院院士，是愛思唯爾(Elsevier)出版的《電化學通訊》(Electrochemistry Communications)雜志的創刊編輯兼總編，也是《電化學最新觀點》(Current Opinion in Electrochemistry)雜志2017年創刊聯合主編。1980年于倫敦帝國理工學院獲得博士學位，其研究工作主要集中于基礎電化學、應用電化學以及包括納米化學在内的電化學分析方面，基于Compton課題組專利的Senova pHit掃描儀是世界上第一台無校準pH值計，并于2013年3月在匹茲堡展會（PITTCON）上獲得了“最佳新産品”獎。現已發表論文1500餘篇，專著7本，h指數102，文章總引用次數超過43000次。已申請專利25項，包括新型pH傳感器、氣體傳感和檢測食品中的大蒜強度和辣椒熱度的方法等。
報告摘要：First the analytical need for nanoparticle detection will be introduced and electrochemical studies of nanoparticles shown to allow for and electrochemical studies on suspensions of nanoparticles shown to allow the detection and characterisation of diverse nanoparticles at the single entity level. For electroactive nanoparticles such as those of silver, Ag, or iron oxide, Fe3O4, quantification of the charge associated with single collisional impacts, allows the sizing of the particles in the range from ca 100 nm down to less than 5 nm. The frequency of impact events permits particle concentrations to be estimated and the potential dependence indicates the chemical nature of the impact particles.
In many cases the electrochemistry reveals agglomeration or aggregation of the particles and since the monomers and agglomerated diffuse at different speeds the kinetics of de-agglomeration can be inferred in cases such as that of uncapped Bi2O3 particles where the electrochemical signals are dominated by the monomer signal whilst independent evidence shows significant agglomeration in bulk solution. A model for the extent of agglomeration will be discussed.
Second the extension to the study, at the single entity, will; be described in terms of the detection of bacteria, red blood cells, the doping of particles of solids and polymers and in nano-droplets will be reported.
Finally the possible nano-toxicity of silver will be discussed.
