奈米級α-Al2O3表面在水系中，對物理或化學的處理效果值得研究。高純度（99%）的氧化鋁原始粉，於不同的溫度及酸鹼條件下，利用水熱反應能適度地改變Al-O及(OH)間的鍵結狀態。類似Gibbsite (Al(OH)3)轉變為Boehmite (AlO(OH))之效應。此一轉換可因此改變鋁水化合物的表面性質，進而提供未來處理技術及應用之依據。

　　本研究採用粒徑分佈為100~150nm α-Al2O3原始粉，調整pH值為2、3、4、7及9比較，並控制溫度，來進行微波水熱實驗。經微波水熱處理過的α-Al2O3表面，其AlO-H會隨著加熱的溫度與酸鹼值的不同而有顯著的變化，並利用FTIR及熱重分析證實氧化鋁表面OH鍵結的增加。

　　而且在酸性及高溫的條件下，α-Al2O3表面將獲得較高的OH基鍵結披覆量，約達到35%。此一結果經由FTIR光譜儀證實AlO-H鍵結及H-O-H鍵結產生於奈米α-Al2O3表面；以及利用FTIR圖譜將波數為3400~3700 cm-1的吸收峰予以積分對比證實氧化鋁表面OH基鍵結量會隨著溫度的上升而增加，並且在溫度220℃及pH值為2的酸性環境下，將得到最大OH基鍵結吸附量。進一步藉由 TG的分析得到OH基鍵結披覆增加量亦有相同的趨勢。

　The result of surface treatment on nano α-Al2O3 in water system by physical or chemical method is worth studying. In various pH environments and different temperature, primitive powder of alumina of the high purity (99%) will transform the surface bond of Al-O and OH. This has similar effect of Gibbsite (Al (OH)3) is changed into boehmite (AlOOH). This conversion can change the surface property of the aluminum and offer a basis of treatment technology and application in the future.

　The objectives of this research are to investigate the influence of pH and temperature on hydrothermal treatments by microwave heating. This research adopts the size of α-Al2O3 are around 100~150nn. Be modified surface of α-Al2O3 can be represented by AlO-H bonding and identified by FTIR. Experimental results showed that the maximum content of hydroxyl bonds adsorption could reach 35 %, when reaction temperature is higher and under the acid condition. The experimental data of this study can be well discovered AlO-H bonds and H-O-H bonds absorption peaks on 3400~3700 cm-1 by FTIR. We also indicate that hydroxyl bonds adsorption increases as the temperature is rising by integrating the absorption peaks of 3400~3700 cm-1 and thermo-gravimetric (TGA). When reaction temperature is at 220 ℃ and pH is at 2, the surface of α-Al2O3 will adsorb maximum hydroxyl bonds.

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