High-efficiency oil-water separation and passive radiant cooling performance of nano-ZnO- embedded dust-free paper

Developing a flexible nano-composite material which is not only impermeable to low-polar oil, but also has the ability of daytime radiation cooling, remains a huge challenge for both academia and industry. By modifying the fiber network of the dust-free paper using nano-ZnO particles (ZnO-DF), we st...

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Bibliographic Details
Published in:Materials chemistry and physics 2022-06, Vol.285, p.126069, Article 126069
Main Authors: Zhang, Hengyang, Yu, Miao, Du, Yang, Xu, Liang, Ma, Deping, Wang, Qun
Format: Article
Language:English
Subjects:
Composite materials
Contact angle
Cooling
Cooling effects
Corrosion resistance
Daytime
Dust
Dust-free paper
Evaporative cooling
Hydrophilicity
Nanocomposites
Oil-water separation
Passive daytime radiative cooling
Radiant cooling
Separation
Superhydrophilic
Superoleophobic
Surface energy
Sweat
Sweat evaporation
Thermal management
Zinc oxide
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Summary:Developing a flexible nano-composite material which is not only impermeable to low-polar oil, but also has the ability of daytime radiation cooling, remains a huge challenge for both academia and industry. By modifying the fiber network of the dust-free paper using nano-ZnO particles (ZnO-DF), we strategically designed and demonstrated dual capabilities of superhydrophilicity/superoleophobicity and daytime radiant cooling for the flexible cellulose nano-composite simultaneously. A superior surface with superhydrophilic/superoleophobic (oil contact angle up to 159° and water contact angle down to 0°) was attained by regulation of surface energy components and roughness. Furthermore, the materials revealed outstanding corrosion and mechanical damage resistance, 152,788 L m−2 h−1 high permeation flux and >99.2% continuous and efficient oil-water separation performance. In addition, a cooling effect of about 5.6 °C of ZnO-DF paper could be achieved by cooperative function of both radiative cooling and sweat evaporation. It is expected that the ZnO-DF paper is promising for the thermal management of wearable products integrated with passive radiant cooling, phase change cooling (e.g., sweat evaporation) and large-scale industrial oil-water separation. [Display omitted] •A novel and stable flexible cellulose “ZnO-DF paper” nanocomposites were fabricated.•Nanocomposites have multi-functions covering superhydrophilic/superoleophobic and passive radiant cooling.•◆Cetane-water mixture separation efficiency is up to 99.2%, and the extremely high water permeation flux up to 152,788 L m−2 h−1.•5.6 °C of moist ZnO-DF paper could be achieved by cooperative function of both radiative cooling and sweat evaporation.
ISSN:0254-0584
1879-3312
DOI:10.1016/j.matchemphys.2022.126069