酒精溶液中微米氣泡的動態與穩定性

近幾年來，微米氣泡技術因為低成本且對環境友善的方式，廣泛運用在許多領域上，微米氣泡的動態研究已經引起極大的關注。本研究發現刺激特定濃度的酒精溶液，可以簡單快速地激發濃密且高穩定性的微米氣泡。為了以物理的角度去解釋這不尋常的氣泡動態，本實驗使用光散射技術、收集溶液釋放的氣體與剪切力實驗，了解氣泡的形成過程與消耗方式。然後使用兩種激發氣泡的方式，即加氣泡/撞擊法，分別在不同表面張力、氣泡數目與溶液氣體量下，觀察氣泡衰減動態。此外，我們也用顯微光學技術捕捉氣泡在激發瞬間的影像，分析氣泡大小、數目和氣泡氣體量隨時間的變化。根據本實驗結果，我們推論在特定濃度下的酒精溶液，溶液氣體的釋放過程緩慢。當刺激溶液時，此系統會激發出許多半徑1 ~ 2 um的微小氣泡，並同時競爭氣體，造成氣泡成長延遲的現象。

關鍵字

微米氣泡；聲波成核；氣泡穩定性；氣泡成長

並列摘要

Recently, because of the advantages of eco-friendly and low cost, microbubble technology has brought great attention on many fields. In our research, we study dynamics and stability of microbubbles in an alcohol solution by applying impact on the container of the ethanol- water solution. In the experiments, we found that abundant long-lasting fine bubbles came out after the impact. In order to explain this unusual bubble dynamics, we used the light scattering, gas collection and shear force experiments to. Besides, we used methods of adding bubbles/tapping to investigate bubble intensity decay under different factors of surface tension, number of nuclei and gas supplication. Microscopic images of microbubbles were also used to analyze dynamics of bubble number, size and gas amount. According to the results, we propose that the ethanol-water solution under specific ethanol concentration is used in slow gas diffusion. After inducing a high density of microbubbles within 1 ~ 2 um, the competition between gas and nuclei would happen. The dynamics of bubble growth would be delayed.