Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 14, Issue 34, Pages 39610-39621Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsami.2c11251
Keywords
lotus leaf; controllable electrospinning; biomimetic; waterproof breathable; fibrous membrane
Funding
- CityU [9231419, 15201719]
- National Natural Science Foundation of China [9380116]
- Study of Multi-Responsive Shape Memory Polyurethane Nanocomposites Inspired by Natural Fibers [52073241]
- Developing Spider-Silk-Model Artificial Fibers by A Chemical Synthetic Approach [51673162]
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Inspired by the micro/nanostructures of lotus leaves, this study constructed a structured electrospun membrane with excellent comprehensive properties. The performance of the membrane was systematically evaluated through experiments and simulations. The structured membrane demonstrated high water vapor transmission rate, good air permeability, and high hydrostatic pressure, showing potential applications in advanced fibrous membranes and intelligent protection.
Electrospinning is a feasible technology to fabricate nanomaterials. However, the preparation of nanomaterials with controllable structures of microbeads and fine nanofibers is still a challenge, which hinders widespread applications of electrospun products. Herein, inspired by the micro /nanostructures of lotus leaves, we constructed a structured electrospun membrane with excellent comprehensive properties. First, micro/nanostructures of membranes with adjustable microbeads and nanofibers were fabricated on a large scale and quantitatively analyzed based on the controlling preparation, and their performances were systematically evaluated. The deformation of diverse polymeric solution droplets in the electrospinning process under varying electric fields was then simulated by molecular dynamic simulation. Finally, novel fibrous membranes with structured sublayers and controllable morphologies were designed, prepared, and compared. The achieved structured membranes demonstrate a high water vapor transmission rate (WVTR) > 17.5 kg/(m(2) day), a good air permeability (AP) > 5 mL/s, a high water contact angle (WCA) up to 151 degrees, and a high hydrostatic pressure of 623 mbar. The disclosed science and technology in this article can provide a feasible method to not only adjust micro /nanostructure fibers but also to design secondary multilayer structures. This research is believed to assist in promoting the diversified development of advanced fibrous membranes and intelligent protection.
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