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Ruoff, Rodney S.
Center for Multidimensional Carbon Materials (CMCM)
Research Interests
  • Next generation carbons, ultrathin sp3-bonded carbon sheets, negative curvature (‘Schwartzites’) carbons, sp3/sp2 hybrid carbon materials, model compounds for novel carbon materials, reaction mechanisms

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

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Title
Freeze-Casting Produces a Graphene Oxide Aerogel with a Radial and Centrosymmetric Structure
Author
Wang, ChunhuiChen, XiongWang, BinHuang, MingWang, BoJiang, YiRuoff, Rodney S.
Keywords
bidirectional freezing;  elastic;  freeze-casting;  graphene oxide aerogel;  radially aligned
Issue Date
201806
Publisher
AMER CHEMICAL SOC
Citation
ACS NANO, v.12, no.6, pp.5816 - 5825
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 GO 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 use of G-O (and reduced G-O and "graphenic") aerogels.
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DOI
http://dx.doi.org/10.1021/acsnano.8b01747
ISSN
1936-0851
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