Journal
APPLIED SURFACE SCIENCE
Volume 439, Issue -, Pages 946-953Publisher
ELSEVIER
DOI: 10.1016/j.apsusc.2017.12.194
Keywords
Graphene aerogels; Modulation; Density; Hydrophobicity; Oil-uptake capability
Categories
Funding
- Natural Science Foundation of China [50972060]
- Fundamental Research Funds of the Central University [30920130112003]
- Qin Lan Project
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
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Modulation of the density (from 3.5 to 64 mg cm(-3)), hydrophobicity and oil-uptake capability of graphene aerogels in extensive ranges were achieved by reacting (3-Mercaptopropyl) trimethoxysilane (MPS) with graphene oxide solutions under heating. The reaction allowed a characteristic silicone substructure to be formed on graphene and joint the graphene layers firmly together. With the increase of MPS concentrations (<= ca. 0.2 vol%), the nano silicone polymer grown on graphene functioned as a ''linker and ''spacer, leading to a substantial decrease of the aerogel density. Because of the formation of silicone polymer and the characteristic nano-micro substructures on the backbones of graphene aerogels, the graphene aerogels exhibited a high hydrophobicity with the water contact angle consistently exceeding 142 degrees. Functionalized graphene aerogels with a density of 3.5 mg cm (3) were conveniently fabricated that displayed an extraordinary oil absorption capacity, 182 times for lubricating oil and 143 times for n-hexane of its own weight. Furthermore, the aerogels maintained their ultra-high absorption capability even after 20 absorption-distillation cycles, due to structural integrity held by the strong interfacial adhesion between graphene sheets and polymer chains of aerogels. This study offers a promising graphene aerogels and also provides a strategy for fabricating extra low dense functional materials. (C) 2018 Elsevier B.V. All rights reserved.
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