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不可溶SiO2 (10nm-6nm)以及可溶鼠李糖(25nm- 8nm)奈米微粒並以流動型雲霧室探討正丁醇蒸氣上所引起之非均勻相核凝機構。
　　SiO2微粒與鼠李糖微粒在過飽和正丁醇蒸氣中，臨界過飽和度隨粒徑減小而增大。定性上與理論計算之趨勢相符合，但定量上仍有一段差距。
　　電荷效應部分，SiO2微粒於實驗範圍中可觀察到電荷效應對核凝現象的影響，但效果並不明顯，與理論相符。鼠李糖微粒電荷效應則不明顯。電荷極性效應部分，SiO2微粒於實驗範圍中，帶單一負電對正丁醇蒸氣的核凝能力大於帶單一正電微粒，與部分理論相矛盾。可往更小粒徑去探討電荷極性效應對核凝現象的影響。鼠李糖單一正電微粒在正丁醇蒸氣中核凝能力則大於帶單一負電微粒，與理論相符。
　　可溶性微粒與不可溶性微粒比較方面，實驗結果與理論相符，可溶性微粒臨界過飽和度皆小於不可溶性微粒。

　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.A systematic study on the heterogeneous nucleation of n-butanol vapor on neutral and various single-charged nanoparticles of SiO2(10nm to 6nm)/Rhamnose(8nm-25nm) is performed employing an electro- spraying device and a flow cloud chamber (FCC).
　The results show that the experimental critical supersaturation,Scr, decreases with increasing particle size, at a rate in reasonable agreement with that predicted by Fletcher’s version of Volmer’s theory of heterogeneous nucleation.
　The Scr of neutral and charged SiO2 particles are slightly different.On the other hand, a charged effect on Scr is observed. The condensation on single- charged positive and single-charged negative particles are also examined. N-butanol vapor is more readily to condense on single-charged negative SiO2 particles and single-charged positive Rhamnose particles.
　Solube particle Scr is smaller than insoluble particle Scr, in agreement with the theoretical prediction.

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