Mechanical and transport properties of fibrous amorphous silica meshes and membranes fabricated from compressed electrospun precursor fibers
Mechanical and transport properties of fibrous amorphous silica meshes and membranes fabricated from compressed electrospun precursor fibers
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DOI：
10.1016/j.jnoncrysol.2019.119653
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发表时间：
2019-12
影响因子：
3.5
通讯作者：
A. Stanishevsky;Justin Tchernov
中科院分区：
文献类型：
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作者：
A. Stanishevsky;Justin Tchernov
采用高产率自由表面交变场静电纺丝（AFES）工艺制成的前体纤维，制备了纤维直径为500 ± 200 nm的高度多孔、0.1-1.5 mm厚的纤维状无定形二氧化硅（FAS）网。在煅烧步骤之前，使用纤维前体材料的温和热和压力处理的组合来定制所得FAS结构的机械和传输性质。当在600和1000 °C之间煅烧时，初生材料的压缩确定了FAS结构的所得孔隙率、有效纤维直径和微结构。柔性FAS补片和膜的拉伸强度和模量分别高达1.4 MPa和580 MPa，达西渗透系数范围为1.2 × 10−12-1.6 × 10− 11 m2。考虑到压缩依赖的有效纤维直径，压缩FAS膜的渗透性符合为堆叠层内具有部分纤维对齐的二维纤维层结构开发的模型。
Highly porous, 0.1–1.5 mm thick fibrous amorphous silica (FAS) meshes with 500 ± 200 nm fiber diameters were prepared from the precursor fibers made by a high-yield free-surface alternating field electrospinning (AFES) process. A combination of mild thermal and pressure treatment of the fibrous precursor material before the calcination step was used to tailor the mechanical and transport properties of the resulting FAS structures. Compression of the as-spun material determined the resulting porosity, effective fiber diameter, and microarchitecture of the FAS structures when calcined between 600 and 1000 °C. Flexible FAS meshes and membranes revealed the tensile strength and modulus up to 1.4 MPa and 580 MPa, respectively, and Darcy'S permeability coefficient in a range of 1.2 × 10−12–1.6 × 10−11m2. Taking into consideration the compression-dependent effective fiber diameter, the permeability of compressed FAS membranes fitted the models developed for two-dimensional fibrous layer architectures with partial fiber alignment within the stacked layers.