Fabrication of aligned lamellar porous alumina using directional solidification of aqueous slurries with an applied electrostatic field

Fabrication of aligned lamellar porous alumina using directional solidification of aqueous slurries with an applied electrostatic field
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利用施加静电场的水浆定向凝固制备定向层状多孔氧化铝

DOI:
10.1016/j.jeurceramsoc.2010.03.012
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发表时间:
2010-07
影响因子:
5.7
通讯作者:
Qin, Y. S.
Qin, Y. S.
中科院分区:
材料科学1区
文献类型:
--
作者:
Zhao, K.;Tang, Y. F.;Wei, J. Q.;Qin, Y. S.

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采用一种新的方法,结合定向凝固的含水浆料施加静电场制备定向多孔氧化铝支架。1°C/mm的温度梯度诱导垂直凝固方向。温度梯度与所施加的静电场之间的角度为90°。当静电场强度从10 kV/m增加到100 kV/m时,多孔氧化铝的平均片层间距从53.2 μm增加到278.5μm,片层孔道与温度梯度方向的夹角从7.5°增加到52.6°。层状孔道的方向是温度梯度和静电场强度的矢量和。使用定向凝固结合外加静电场可以很容易地控制具有有序片状结构的多孔氧化铝的制造。
A novel method combining directional solidification of aqueous slurries with an applied electrostatic field was used to fabricate aligned porous alumina scaffolds. A temperature gradient of 1°C/mm induced a vertical solidification direction. The angle between the temperature gradient and the applied electrostatic field was 90°. As the electrostatic field intensity was increased from 10 to 100kV/m, the average lamellar spacing of the porous alumina increased from 53.2 to 278.5μm, and the angle of the lamellar pore channels changed from 7.5° to 52.6° compared to the direction of the temperature gradient. The direction of the lamellar pore channels was a vector sum of the temperature gradient and the electrostatic field intensity. The fabrication of porous alumina with an ordered, lamellar structure can be readily controlled using directional solidification combined with an applied electrostatic field.
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