Freeze-Casting Produces a Graphene Oxide Aerogel with a Radial and Centrosymmetric Structure

ACS Nano
Chunhui WangRodney S Ruoff

Abstract

We report the assembly of graphene oxide (G-O) building blocks into a vertical and radially aligned structure by a bidirectional freeze-casting approach. The crystallization of water to ice assembles the G-O sheets into a structure, a G-O aerogel whose local structure mimics turbine blades. The centimeter-scale radiating structure in this aerogel has many channels whose width increases with distance from the center. This was achieved by controlling the formation of the ice crystals in the aqueous G-O dispersion that grew radially in the shape of lamellae during freezing. Because the shape and size of ice crystals is influenced by the G-O sheets, different additives (ethanol, cellulose nanofibers, and chitosan) that can form hydrogen bonds with H2O were tested and found to affect the interaction between the G-O and formation of ice crystals, producing ice crystals with different shapes. A G-O/chitosan aerogel with a spiral pattern was also obtained. After chemical reduction of G-O, our aerogel exhibited elasticity and absorption capacity superior to that of graphene aerogels with "traditional" pore structures made by conventional freeze-casting. This methodology can be expanded to many other configurations and should widen the u...Continue Reading

References

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Citations

Apr 9, 2019·Advanced Materials·Yuanyuan CaoMark J MacLachlan
Apr 24, 2019·Polymers·Elizabeth BarriosLei Zhai
Jan 22, 2021·ACS Applied Materials & Interfaces·Yi MengHaisong Wang
Apr 23, 2021·Langmuir : the ACS Journal of Surfaces and Colloids·Dennis MüllerNadja C Bigall
Jun 18, 2021·Nano-micro Letters·Zheng BoKefa Cen
Jul 23, 2021·ACS Applied Materials & Interfaces·Dong XiaPeng Huang
Dec 16, 2020·ACS Applied Materials & Interfaces·Minyu LiJun Qian
Jan 31, 2019·ACS Applied Materials & Interfaces·Rahul ShevateKlaus-Viktor Peinemann
Oct 3, 2018·ACS Applied Materials & Interfaces·Jin KimSeokwoo Jeon
Aug 28, 2020·Chemical Reviews·Zhuxing SunYun Hang Hu
Apr 5, 2019·ACS Applied Materials & Interfaces·Gui-Wen HuangHong-Mei Xiao
Aug 26, 2020·ACS Applied Materials & Interfaces·Tao MeiDong Wang
Nov 1, 2018·ACS Applied Materials & Interfaces·Yijie HuXinwen Peng
Oct 27, 2021·ACS Applied Materials & Interfaces·Degang JiangJoselito M Razal
Dec 22, 2021·Journal of Materials Chemistry. B, Materials for Biology and Medicine·Christopher J BrownAlice A K King

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