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Mechanical Properties of Ultralow Density Graphene Oxide/Polydimethylsiloxane Foams

Published online by Cambridge University Press:  18 January 2018

Cristiano F. Woellner ,
Peter S. Owuor ,
Tong Li ,
Soumya Vinod ,
Sehmus Ozden ,
Suppanat Kosolwattana ,
Sanjit Bhowmick ,
Luong X. Duy ,
Rodrigo V. Salvatierra  and
Bingqing Wei
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Cristiano F. Woellner*
Affiliation:
Applied Physics Department, State University of Campinas, 13083-859Campinas-SP, Brazil Center for Computational Engineering & Sciences, State University of Campinas, Campinas-SP, Brazil
Peter S. Owuor
Affiliation:
Department of MSNE Rice University Houston, TX77005, USA
Tong Li
Affiliation:
Center for Computational Engineering & Sciences, State University of Campinas, Campinas-SP, Brazil
Soumya Vinod
Affiliation:
Department of MSNE Rice University Houston, TX77005, USA
Sehmus Ozden
Affiliation:
Center for Computational Engineering & Sciences, State University of Campinas, Campinas-SP, Brazil
Suppanat Kosolwattana
Affiliation:
Department of MSNE Rice University Houston, TX77005, USA
Sanjit Bhowmick
Affiliation:
Hysitron, Inc. Minneapolis, MN55344, USA
Luong X. Duy
Affiliation:
Department of MSNE Rice University Houston, TX77005, USA
Rodrigo V. Salvatierra
Affiliation:
Department of MSNE Rice University Houston, TX77005, USA
Bingqing Wei
Affiliation:
Mechanical Engineering University of Delaware DE19717, USA,
Syed A. S. Amanulla
Affiliation:
Hysitron, Inc. Minneapolis, MN55344, USA
James M. Tour
Affiliation:
Department of MSNE Rice University Houston, TX77005, USA
Robert Vajtai
Affiliation:
Department of MSNE Rice University Houston, TX77005, USA
Jun Lou
Affiliation:
Department of MSNE Rice University Houston, TX77005, USA
Douglas S. Galvão
Affiliation:
Applied Physics Department, State University of Campinas, 13083-859Campinas-SP, Brazil Center for Computational Engineering & Sciences, State University of Campinas, Campinas-SP, Brazil
Chandra S. Tiwary
Affiliation:
Department of MSNE Rice University Houston, TX77005, USA
Pulickel. M. Ajayan
Affiliation:
Department of MSNE Rice University Houston, TX77005, USA
*
*(Email: crisfisico@gmail.com, woellner@ifi.unicamp.br)
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Abstract

Low-density, highly porous graphene/graphene oxide (GO) based-foams have shown high performance in energy absorption applications, even under high compressive deformations. In general, foams are very effective as energy dissipative materials and have been widely used in many areas such as automotive, aerospace and biomedical industries. In the case of graphene-based foams, the good mechanical properties are mainly attributed to the intrinsic graphene and/or GO electronic and mechanical properties. Despite the attractive physical properties of graphene/GO based-foams, their structural and thermal stabilities are still a problem for some applications. For instance, they are easily degraded when placed in flowing solutions, either by the collapsing of their layers or just by structural disintegration into small pieces. Recently, a new and scalable synthetic approach to produce low-density 3D macroscopic GO structure interconnected with polydimethylsiloxane (PDMS) polymeric chains (pGO) was proposed. A controlled amount of PDMS is infused into the freeze-dried foam resulting into a very rigid structure with improved mechanical properties, such as tensile plasticity and toughness. The PDMS wets the graphene oxide sheets and acts like a glue bonding PDMS and GO sheets. In order to obtain further insights on mechanisms behind the enhanced mechanical pGO response we carried out fully atomistic molecular dynamics (MD) simulations. Based on MD results, we build up a structural model that can explain the experimentally observed mechanical behavior.

Keywords

elastic propertiesfoamfreeze drying
Type
Articles
Information
MRS Advances , Volume 3 , Issue 1-2: Nanomaterials , 2018 , pp. 61 - 66
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Copyright
Copyright © Materials Research Society 2018 

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