Journal
CHEMICAL ENGINEERING JOURNAL
Volume 442, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2022.136338
Keywords
Wood elastomer; Superhydrophobicity; Cellulose nanoarrays; Lignin; Wood ray; Photothermal effect
Categories
Funding
- National Nat-ural Science Foundation of China [32122058, 31870535, 32001380, 32001256, 11890681]
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A superhydrophobic elastomer made directly from natural wood with a simple chemicothermal treatment is reported, which retains the unique micro-nano structure of the wood and exhibits various physical-chemical properties. The elastomer shows potential applications in solar-assisted crude oil recovery and water/oily liquids separation due to its microstructure and functionalities derived from wood itself.
Herein, we report a superhydrophobic elastomer which was made directly from natural wood with a simple chemicothermal treatment without adding any modification chemicals. One of the most important findings is that the unique micro-nano structure in original wood was well maintained in the final wood elastomer, which result in many unique physical-chemical properties. The chemicothermal process tailors the nano-microstructure of wood by deteriorating polysaccharides into cellulose nanoarrays, and simultaneously, removes the hydrophilic groups in lignin which then re-assembles to cellulose nanoarrays to form a superhydrophobic surface with a contact angle up to 152 degrees. Retained lignin aromatic skeleton also results in significant self-photothermal effect. Meanwhile, ray tissues in natural wood are hollowed to leave leaf-spring-like microstructure, which leads to great elasticity of wood elastomer with 97% stress retention at 60% strain after 103 compression cycles. Thanks to the microstructure and functions arising from wood itself, the elastomer shows many potential applications such as in solar-assisted crude oil recovery as well as water/oily liquids separation.
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