Economical and environmentally friendly synthesis of nanosized α-Al₂O₃ with high specific surface area remains considerable challenges due to the thermodynamically instability and high activation energy barrier. Herein, the highly efficient strategy−one-step mechanochemical transformation of bulk pseudo-boehmite into nanosized α-Al₂O₃ has been developed. Variety of factors, including drying degree, process control agents, texture of media, have been surveyed during mechanochemical process. By optimization, the nanosized α-Al₂O₃ with average grain size of 16.5 nm and specific surface area of 101. 7 m² g⁻¹ are successfully prepared. By monitoring ball-milling process, we propose a decrystallization-recrystallization mechanism for the transformation of pseudo-boehmite into α-Al₂O₃. This work would pave new pathway on one-step mechanochemical synthesis of nanosized α-Al₂O₃.

由于热力学不稳定性和高活化能垒，具有高比表面积的纳米尺寸α-Al ₂ O ₃的经济和环保合成仍然是相当大的挑战。_{在此，我们开发了将块状假勃姆石高效机械化学转化为纳米级α-Al 2} O ₃的高效策略——一步机械化学转化。在机械化学过程中，对干燥程度、过程控制剂、介质质地等多种因素进行了调查。经过优化，得到平均粒径为16.5 nm，比表面积为101. 7 m ²  g ^-1的纳米级α-Al ₂ O _{3 。}已成功准备。通过监测球磨过程，我们提出了假勃姆石转变为α-Al ₂ O ₃的去结晶-再结晶机制。这项工作将为一步机械化学合成纳米尺寸的α-Al ₂ O ₃开辟新的途径。