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以及可溶葡萄糖(Glucose)、味精(Glutamate)奈米微粒並以流動型雲霧室探討微粒在水蒸氣中所引起之非均勻相核凝機構。
實驗中利用電噴霧系統製備10nm以下之高濃度SiO2、葡萄糖及味精微粒，故探討溶液濃度、溶液流速、暈光放電電壓、載流氣體流量等因素對微粒粒徑及濃度的影響。
SiO2微粒與葡萄糖、味精微粒在過飽和水蒸氣中，臨界過飽和度皆隨粒徑減小而增大。定性上與理論計算之趨勢相符合，但定量上仍有一段差距。
電荷效應部份，單一粒徑之SiO2與葡萄糖中性微粒臨界過飽和度皆大於帶電微粒，可觀察到電荷效應對核凝現象的影響，粒徑越小越明顯。味精微粒則稍微有電荷效應，但不明顯，需往更小粒徑探討。
電荷極性效應部份，帶單一負電之SiO2微粒對水蒸氣的核凝能力大於帶單一正電微粒。葡萄糖、味精微粒帶單一負電之對水蒸氣的核凝能力大於帶單一正電微粒，此結果與文獻中所提之結果相符。

Condensation of a supersaturated water vapor on nanoparticles of SiO2 、glucose and glutamate was investigated in the FCC. An electrospray system is developed and has succeeded in producing nanoparticles of less than 10 nm. The particle size distribution is controllable by the adjustment of the operation parameters such as flow rates, corona discharge voltage, etc.
The onset of heterogeneous nucleation was determined through measurements of removal efficiency as a function of the supersaturation along with observations of the laser light scattered by the falling droplets. Our results showed that the experimental Scr decreases with increasing particle size at a rate in reasonable agreement with the predictions.
The Scr of neutral particles of SiO2 are slightly higher than the predictions of the Fletcher version of Volmer theory for neutral particles. For glucose and glutamate, experimental Scr of neutral and charged particles are higher than the theoratical predictions of Volmer theory and kohler theory.
The charge effect of SiO2 and glucose are observed, and it is much higher than the theoretical predictions. Furthermore, for the sign preference, water condenses more readily on negatively charged particle SiO2 、glucose and glutamate. The sign preference we observed agrees with the sign preference observed in the condensation of water vapor on ions.
The Scr of the soluble particles is smaller than the insoluble particles, agreeing with the theoretical prediction.

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