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Superhydrophobic lotus-leaf-like surface made from reduced graphene oxide through soft-lithographic duplication
Xiawei Yun1, Zhiyuan Xiong1, Yaning He1
1Laboratory of Advanced Materials (MOE), Department of Chemical Engineering, Tsinghua University Beijing 100084 P. R. China wxg-dce@mail.tsinghua.edu.cn.
RSC Advances
|May 2, 2022
Summary
Researchers created durable superhydrophobic surfaces mimicking lotus leaves using reduced graphene oxide (RGO). These RGO-based surfaces exhibit excellent water repellency and stability in harsh conditions, paving the way for advanced material applications.
Area of Science:
- Materials Science
- Surface Chemistry
- Nanotechnology
Background:
- Superhydrophobic surfaces mimic natural structures like lotus leaves for water repellency.
- Developing durable and stable superhydrophobic materials is crucial for practical applications.
Purpose of the Study:
- To fabricate superhydrophobic lotus-leaf-like surfaces using reduced graphene oxide (RGO).
- To evaluate the stability and durability of the fabricated RGO-based surfaces under various environmental conditions.
Main Methods:
- Soft-lithographic duplication using polydimethylsiloxane (PDMS) stamps.
- Microcontact printing of octadecylamine-modified reduced graphene oxide (ODA-RGO) dispersions.
- Characterization of surface morphology and superhydrophobic properties (water contact angle, contact angle hysteresis).
Main Results:
- High-fidelity replication of lotus leaf micro/nano-structures achieved using ODA-RGO.
- Fabricated surfaces demonstrated superhydrophobicity with water contact angles >160° and hysteresis <5°.
- Surfaces maintained superhydrophobicity after 24h heating at 150°C and 12h exposure to corrosive solutions (varying pH).
Conclusions:
- Reduced graphene oxide is a suitable material for creating environmentally durable lotus-leaf-like superhydrophobic surfaces.
- The developed surfaces exhibit excellent stability and potential for applications requiring robust water-repellent properties.
