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研究生:廖建洲
研究生(外文):Liao, Jainzhou
論文名稱:氯鋁酞青素-乙醇溶液中溶質傳輸之研究
論文名稱(外文):Study of Solute Migration of Chloroaluminum Phthalocyanine Dissolved in Ethanol
指導教授:魏台輝
指導教授(外文):Wei,Taihui
口試委員:湯兆崙陳慶緒
口試委員(外文):Tang, ZhaolunChen, Chinhsu
口試日期:100年7月31日
學位類別:碩士
校院名稱:國立中正大學
系所名稱:物理學系暨研究所
學門:自然科學學門
學類:物理學類
論文種類:學術論文
論文出版年:2011
畢業學年度:100
語文別:中文
論文頁數:47
中文關鍵詞:氯鋁酞青素五能級熱擴散質量擴散對流
外文關鍵詞:Chloroaluminum PhthalocyanineClAlPcThermal diffusionMass diffusionconvection
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本論文旨在調查氯鋁酞青素-乙醇溶液(chloroaluminum phthalocyanine-ethanol,簡稱為ClAlPc-ethanol)在秒(s)時域的熱擴散(thermal diffusion,溫度梯度引起的溶質分子質量傳輸現象)、質量擴散(mass diffusion,不均勻的溶質分子濃度所引起的溶質分子質量傳輸效應)以及對流等效應。我們將不同功率的CW He-Ne雷射(632.8nm)以及DPSS雷射(532nm)光截成2 s或5 s的脈衝,以之垂直入射至1 mm 7  104 M的ClAlPc-ethanol溶液,然後量測穿透率(穿透光功率除以入射光功率)隨時間變化的情形。在632.8 nm的實驗中,我們將入射光傳播方向分成垂直與水平於桌面等兩種方向,而在532 nm的實驗中,則只採用入射光垂直於光學桌面的裝置。逐一考量穿透光功率隨入射光傳播方向、光波長、光功率以及時間變化的情形,我們確認以上所提各種效應。
結合實驗觀察與理論分析,我們推論溶質分子藉吸收TEM00模態的雷射光能而提升溶液溫度,並沿雷射光側向(lateral direction)產生溫度梯度,驅動溶質分子由光斑中心往光斑邊緣傳輸,造成熱擴散效應,使光穿透率隨時間上升;當熱擴散效應將溶質分子由光斑中心推往往光斑邊緣之後,質量擴散將溶質分子由高溶質濃度(光斑邊緣)區推回低溶質濃度(光斑中心)區,減緩光穿透率上升速率。當入射光傳播方向水平於桌面的時候,我們在熱擴散與質量擴散之外進一步發現對流效應的產生,造成光斑中心的偏移以及光穿透率隨時間的變化由上升轉為下降。

In this thesis, we investigate thermal and mass diffusions (mass transport induced by temperature and concentration gradients respectively) and convection in an 1 mm thick 7  104 M ethanolic solution of chloroaluminum phthalocyanine, dubbed as ClAlPc-ethanol, with a CW HeNe laser (632.8 nm) and a CW DPSS laser (532 nm), both operated at the TEM00 mode. In the study with HeNe laser, we measure, in both the vertical and horizontal irradiation geometries, the transmittance (transmitted power divided by incident power) of the 632.8 nm laser light disrupted into 2 and 5 s pulses by a shutter. However, in the study with DPSS laser, we measure in the horizontal irradiation geometry alone, the transmittance of the 532 nm laser light disrupted into 2 and 5 s pulses. Here, by vertical or horizontal irradiation geometry, we mean the sample is placed with its incident surface parallel or vertical to the optical table surface and the laser beams propagate vertically downward or parallel to the optical table surface. As a result, we observe the influence of transmittance by the light propagation directions, wavelengths, power and time. Accordingly, we verify the abovementioned thermal and mass diffusions as well as convection.
Based on the experimental results and theoretical analysis, we infer that photo absorption of the TEM00 mode laser light by ClAlPc molecules results in a temperature gradient along the lateral direction which drives the outward solute migration from the laser beam center. This weakens the absorption and hence increases the transmittance of the sample. Afterwards, mass migration is ignited and pushes the solute molecules from the high concentration region (beam periphery) toward the low concentration region (beam center). This slows down the transmittance increase with time. In particular, when the light propagation direction is parallel to the optical table surface, convection occurs and causes the downward beam deflection and a turn over of the transmittance from increase to decrease with time.

摘要 1
Abstract 2
第一章 緒論 5
第二章 理論 7
2.1 介質的吸收與折射 7
2.2 酞青素染料的非線性吸收機制 15
2.3 熱擴散、質量擴散與對流 19
第三章 實驗架設與結果 31
3.1 Z-scan 31
3.2 實驗架設 32
第四章 實驗結果與理論分析 33
4.1 實驗結果 33
4.2 不同波長入射光造成的吸收效應差異 38
4.3 熱擴散與質量擴散效應 40
4.4 實驗結果中分子間的作用力的分析與探討 41
第五章 論文總結與未來展望 44
參考文獻 45
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