中文摘要

　　奈米微粒因為粒徑很小而可能顯現出與巨觀材料性質不同的效應。在大氣中因為天然及人為因素亦產生相當多的奈米微粒，成為大氣氣膠中重要成分。本研究以電噴霧法製備TiO2 以及甘露糖(D-Mannose)奈米微粒並以流動型雲霧室探討正丁醇蒸氣在帶電甘露糖奈米微粒(10~30nm)以及帶電或不帶電之TiO2奈米微粒(5~20nm)上所引起之非均勻相核凝機構。
　　在TiO2 與甘露糖奈米微粒所引起的非均勻相核凝方面，無論是帶電或不帶電的微粒，其粒徑越小，臨界過飽和度隨之增大，定性上與理論相符合。而帶單一正、負電荷之微粒臨界過飽和度大約相同，也就是說並沒有明顯的因微粒所帶之正負電荷極性不同而有不同的效應產生。有關電荷效應，在7~20nm之間的TiO2微粒，不帶電微粒所需之臨界過飽和度小於帶電微粒的值，定性上和理論不符合。
對帶有單一正或負電荷之甘露糖微粒而言，在實驗之粒徑範圍內，其電荷的差別對所需之臨界過飽和度並未造成明顯的差異。

ABSTRACT

　　Nanoparticles may have a property different from the bulk due to such a small size. Recently, the subjects concerning their production, properties and applications have received extensively attention and been intensively investigated. On the other hand, nanoparticles are generated due to natural and anthropogenic activities, and become an important component of the atmospheric aerosols. In the study, an electrospray aerosol generator was used to generate organic/inorganic nanoparticles and the flow cloud chamber(FCC) was employed to examine the effects of particle size and charge on the critical supersaturation for the condensation of a supersaturated n-butanol vapor on organic/inorganic nanoparticles with a diameter from 5 to 30nm, each carrying a single positive or negative charge or no charge.
　　For the condensation of n-butanol vapor on TiO2 and D-Mannose. The results show that no matter the neutral or charged particles, the experimental Scr increases with decreasing particle size at a rate qualitatively in reasonable agreement with the theoretical prediction. The Scr of single-chaged positive and negative particles are almost the same. On the other hand there is not a charge effect on Scr. The Scr of neutral particles is greater than that of the charged particles for TiO2 particles with a diameter in the range of 7~20nm.
The condensation of supersaturated vapor on singly-positively-charged or singly-negatively-charged D-Mannose particles, with diameters of 10~30 nm is also examined. No obvious effect of a charge on Scr is observed.

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