旋塗時接觸角變化研究; Study on Variation of Dynamic Contact Angle during Spin Coating

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题名:	旋塗時接觸角變化研究;Study on Variation of Dynamic Contact Angle during Spin Coating
作者:	林耕葆;Geng-Bao Lin
贡献者:	機械工程研究所
关键词:	動態接觸角;旋塗;spin coating;dynamic contact angle
日期:	2006-06-27
上传时间:	2009-09-21 11:56:45 (UTC+8)
出版者:	國立中央大學圖書館
摘要:	將液體利用旋轉塗佈方式塗佈到固體表面的過程中，會產生表面張力、黏滯力及離心力三者之間的相互關係。本文利用四種黏度的矽油於五種轉速下的動態接觸角與時間、動態接觸角與毛細管數( Ca )、動態接觸角與邦得數( Bo )、動態接觸角與雷諾數( Re ) 及動態接觸角與韋伯數( We )等關係，解釋表面張力、黏滯力及離心力三者對旋轉塗佈時之影響。針對同樣黏度之矽油，不同的旋轉速度，可看出動態接觸角度隨時間的變化有呈現一震盪的現象。此現象可分為三階段：發展期、峰值期、遞減期。發展期階段動態接觸角角度隨實驗時間增加而逐漸變大。峰值期階段動態接觸角度會隨實驗時間增加而達一最大值。遞減期階段動態接觸角角度從最大值降至一穩定值後持續至下一週期。加入無因次參數以幫助對於新現象發生的原因探討與了解。利用所得結果，進一步應用於液滴旋塗時臨界半徑的產生現象分析，最終能得一機制以預測或控制臨界半徑產生時機。 Utilize the liquid the rotatory coating way coating to in solid and superficial course, will produce the interrelation among surface tension, viscid strength and centrifugal three. This text utilizes four kinds viscosity of silicon oil under five kinds of rotational speed to get the relation between dynamical contact angle and time, capillary number (Ca), Bound number (Bo)‚Reynolds number (Re) and Weber number (We), to explain surface tension , viscid strength and centrifugal three to the influence while rotating coatings. To the silicon oil of the same viscosity, different speeds of rotation, can find out that the phenomenon of a shock has appeared with the change of time in the dynamic contact angle. This phenomenon can be divided into three stages: Develop one, peak period and decreasing progressively period. At develop stage the dynamic contact angle will increase with time. Peak period stage the dynamic contact angle will increase with time up to a maximum angle. Decreasing progressively period the dynamic contact will decrease from maximum angle to a stability angle and then last until the next cycle. We are using some dimensionless numbers to help discussion the cause reasons and to new understanding that phenomenon take place. Utilize the result of incomes, use the formulation phenomenon analysis of the critical radius when the drop is fastened and scribbled further, can must one mechanism in order to predict or control critical radius， happen time.
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