Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States.
Langmuir. 2010 Dec 21;26(24):19159-62. doi: 10.1021/la103829c. Epub 2010 Nov 12.
Janus fabrics with superamphiphilicity were fabricated via electrospinning of polyacrylonitrile (PAN). PAN nanofibrous mats were formed on an aluminum foil substrate and then thermally treated to cause hydrolysis. An identical PAN solution was subsequently electrospun onto the hydrolyzed PAN layer, followed by peeling off of the bicomposite film from the collector substrate to produce a free-standing Janus fabric. On one side, the electrospun PAN mat exhibited superhydrophobic properties, with a water contact angle of 151.2°, whereas the initially superhydrophobic PAN sheet on the opposite side of the fabric was converted to a superhydrophilic surface (water contact angle of 0°) through hydrolysis of the surface functional groups induced by the thermal treatment. The resulting Janus fabrics exhibited both superhydrophobicity, repelling water on the one side, and superhydrophilicity, absorbing water on the other side. The organic solvent resistance of the PAN nanofibrous sheets was remarkably improved by incorporation of a tetraethyl orthosilicate. This facile and simple technique introduces a new route for the design and development of functional smart, robust fabrics from an inexpensive, commercially available polymer.
通过静电纺丝聚丙腈（PAN）制备了具有超亲水性的 Janus 织物。PAN 纳米纤维垫形成在铝箔基底上，然后进行热处理以引起水解。随后将相同的 PAN 溶液静电纺丝到水解的 PAN 层上，然后从收集器基底上剥离双复合膜以产生自支撑的 Janus 织物。在一侧，静电纺 PAN 垫表现出超疏水性，水接触角为 151.2°，而织物另一侧的初始超疏水 PAN 片通过热处理诱导的表面官能团水解转化为超亲水表面（水接触角为 0°）。所得的 Janus 织物表现出超疏水性，一侧排斥水，另一侧超亲水性，吸收水。通过掺入正硅酸乙酯，PAN 纳米纤维片的有机溶剂阻力得到显著提高。这种简单而简单的技术为从廉价、市售的聚合物设计和开发功能智能、坚固的织物提供了新途径。
