Structure and mechanical properties of nanofibrous ZrO2 derived from alternating field electrospun precursors
Structure and mechanical properties of nanofibrous ZrO2 derived from alternating field electrospun precursors
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DOI：
10.1016/j.ceramint.2019.06.092
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发表时间：
2019-10
影响因子：
5.2
通讯作者：
A. Stanishevsky;Riley Yager;J. Tomaszewska;M. Binczarski;W. Maniukiewicz;I. Witonska;D. Lukas
中科院分区：
文献类型：
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作者：
A. Stanishevsky;Riley Yager;J. Tomaszewska;M. Binczarski;W. Maniukiewicz;I. Witonska;D. Lukas
纳米纤维氧化锆（ZrO2）网由采用自由表面高产交变电场静电纺丝（AFES）方法合成的前体纤维制备而成。研究了液体前体中氯化氧锆盐与聚乙烯吡咯烷酮 (PVP) 聚合物的重量比对前体纤维的可纺性和形成以及所得纤维状 ZrO2 的影响。使用单个扁平 25 毫米直径交流 (AC) 电极实现了前体纤维生成速度高达 5.6 克/小时，相当于生产高达 1.5 克/小时的纤维状 ZrO2。煅烧过程包括在 600°C 至 1000°C 的温度下对纤维进行退火，并产生 0.1–0.2mm 厚的纤维状 ZrO2 网格。发现单个纳米纤维的直径在 50 至 350 nm 之间，根据煅烧温度，具有四方晶系 (t-ZrO2) 或单斜晶系 (t-ZrO2) 结构。总孔隙率在98.0±0.2%和94.6±0.2%之间的退火网几乎没有变形或开裂。纤维状ZrO2网的拉伸强度和模量强烈依赖于孔隙率，变化范围分别为0.07±0.03MPa至1.05±0.3MPa和90±40MPa至388±20MPa。它们的 ZrO2 网格具有相似的模量，但由于其脆性而强度低得多。与其他多孔氧化锆材料相比，还研究了 AFES 衍生的纳米纤维 ZrO2 网的弹性模量和孔隙率之间的幂律关系。这项研究的结果证明了自由表面 AFES 在大规模生产氧化锆纳米纤维和高度多孔纳米纤维陶瓷结构中的可行性。
Nanofibrous zirconia (ZrO2) meshes were prepared from precursor fibers which were synthesized using the method of free-surface, high-yield alternating field electrospinning (AFES). The weight ratio of zirconyl chloride salt to polyvinylpyrrolidone (PVP) polymer in liquid precursors was investigated for its effect on the spinnability and formation of precursor fibers as well as on the resulting fibrous ZrO2. The precursor fiber generation measured at a rate up to 5.6 g/h was achieved with a single flat 25-mm diameter alternating current (AC) electrode, which corresponded to production of up to 1.5 g/h of fibrous ZrO2. The calcination process involved annealing the fibers at temperatures which ranged from 600 °C to 1000 °C and produced 0.1–0.2 mm thick fibrous ZrO2meshes. Individual nanofibers were found to have diameters between 50 and 350 nm and either a tetragonal (t-ZrO2) or monoclinic (t-ZrO2) structure depending on the calcination temperature. The annealed meshes with total porosity between 98.0 ± 0.2% and 94.6 ± 0.2% showed little deformation or cracking. Tensile strength and modulus of fibroust-ZrO2meshes strongly depended on porosity and varied from 0.07 ± 0.03 MPa to 1.05 ± 0.3 MPa and from 90 ± 40 MPa to 388 ± 20 MPa, respectively. Them-ZrO2meshes resulted similar moduli, but much lower strengths due to their brittleness. A power-law relationship between the elastic modulus and porosity of AFES-derived nanofibroust-ZrO2meshes, in comparison with other porous zirconia materials, was also investigated. The results of this study have demonstrated the feasibility of free-surface AFES in sizeable production of zirconia nanofibers and highly porous nanofibrous ceramic structures.