中文摘要：

以静电纺丝法制备的聚乙烯吡咯烷酮（PVP）纤维为模板,以非水解溶胶-凝胶法制备的Al2O3溶胶为浸渍液,利用模板浸渍技术制备出Al2O3凝胶-PVP复合纤维,再经1 000℃煅烧制备出γ-Al2O3纤维。借助X射线衍射和扫描电镜研究了浸渍溶胶浓度、浸渍时间及浸渍次数对γ-Al2O3纤维物相组成及形貌的影响。结果表明：当Al2O3溶胶中铝离子浓度为0.1 mol/L、浸渍时间为30 s、浸渍1次时,合成的γ-Al2O3纤维表面平滑,连续性好,纤维直径达到0.22μm。

英文摘要：

Polyvinyl pyrrolidone（PVP） fibers were prepared by electrospinning and used as templates. Al2O3 sol was prepared by non-hydrolytic sol-gel method, the Al2O3gel-PVP composite fibers were prepared viathe impregnation of PVP template fibers into Al2O3 sol. After the composite fibers were calcined at 1 000 ℃,γ-Al2O3 fibers formed. The influences on the γ-Al2O3 fibers formation of different processing parameterssuch as dipping concentration of Al2O3 sol, immersion time and dipping times were studied by XRD andSEM. The results showed that when the concentration of Al3＋was 0.1 mol/L, impregnation time was 30 s, andonly once dipping, the surface of γ-Al2O3 fiber was smooth, the fiber diameter was 0.22 μm.