Rheo-optical Analysis of Functionalized Graphene Suspensions

Naveen K. Reddy; Giovanniantonio Natale; Robert K. Prud'Homme; Jan Vermant

doi:10.1021/acs.langmuir.8b01574

Rheo-optical Analysis of Functionalized Graphene Suspensions

Naveen K. Reddy, Giovanniantonio Natale, Robert K. Prud'Homme, Jan Vermant

Princeton University

Research output: Contribution to journal › Article › peer-review

6 Scopus citations

Abstract

Wet processing of graphene sheets is a potentially interesting route for the economically viable creation of graphene-based composites. In the present work, flow dichroism and small-angle light scattering are used to investigate the dispersion of functionalized graphene sheets in a suspension and their response to shear flow. In line with expectations from scaling theory at rest, the functionalized graphene sheets are present as Brownian flat sheets, and there is no evidence of significant crumpling. More surprisingly, we find that the rate-dependent orientation of these molecularly thin sheets can be described by numerical predictions for hard spheroidal sheets, making quantitative predictions of the flow-induced orientation possible. Further comparison of the flow-induced orientation of thick gold decahedra with the thin graphene sheets shows that, except for effects of polydispersity, the flow-induced orientation is predicted well quantitatively. Adequate prediction of the effects of flow on the orientation of graphene sheets makes it possible to design wet processed graphene-based composite materials.

Original language	American English
Pages (from-to)	7844-7851
Number of pages	8
Journal	Langmuir
Volume	34
Issue number	26
DOIs	https://doi.org/10.1021/acs.langmuir.8b01574
State	Published - Jul 3 2018

ASJC Scopus subject areas

General Materials Science
Condensed Matter Physics
Surfaces and Interfaces
Spectroscopy
Electrochemistry

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10.1021/acs.langmuir.8b01574

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title = "Rheo-optical Analysis of Functionalized Graphene Suspensions",

abstract = "Wet processing of graphene sheets is a potentially interesting route for the economically viable creation of graphene-based composites. In the present work, flow dichroism and small-angle light scattering are used to investigate the dispersion of functionalized graphene sheets in a suspension and their response to shear flow. In line with expectations from scaling theory at rest, the functionalized graphene sheets are present as Brownian flat sheets, and there is no evidence of significant crumpling. More surprisingly, we find that the rate-dependent orientation of these molecularly thin sheets can be described by numerical predictions for hard spheroidal sheets, making quantitative predictions of the flow-induced orientation possible. Further comparison of the flow-induced orientation of thick gold decahedra with the thin graphene sheets shows that, except for effects of polydispersity, the flow-induced orientation is predicted well quantitatively. Adequate prediction of the effects of flow on the orientation of graphene sheets makes it possible to design wet processed graphene-based composite materials.",

author = "Reddy, {Naveen K.} and Giovanniantonio Natale and Prud'Homme, {Robert K.} and Jan Vermant",

note = "Funding Information: The authors thank Luiz Lis-Marza{\'n}, Jorge Pe{\'r} ez-Juste, and Isabel Pastoriza-Santos for providing oblate gold spheroids. J.V. acknowledges the Swiss National Science Foundation (project number 200021-157147), and G.N. acknowledges funding from the NSERC (grant number RGPIN-2017-03783). The authors thank the reviewers for insightful comments on the article, as these comments led us to improve it. Publisher Copyright: {\textcopyright} 2018 American Chemical Society.",

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AU - Reddy, Naveen K.

AU - Natale, Giovanniantonio

AU - Prud'Homme, Robert K.

AU - Vermant, Jan

N1 - Funding Information: The authors thank Luiz Lis-Marzań, Jorge Peŕ ez-Juste, and Isabel Pastoriza-Santos for providing oblate gold spheroids. J.V. acknowledges the Swiss National Science Foundation (project number 200021-157147), and G.N. acknowledges funding from the NSERC (grant number RGPIN-2017-03783). The authors thank the reviewers for insightful comments on the article, as these comments led us to improve it. Publisher Copyright: © 2018 American Chemical Society.

PY - 2018/7/3

Y1 - 2018/7/3

N2 - Wet processing of graphene sheets is a potentially interesting route for the economically viable creation of graphene-based composites. In the present work, flow dichroism and small-angle light scattering are used to investigate the dispersion of functionalized graphene sheets in a suspension and their response to shear flow. In line with expectations from scaling theory at rest, the functionalized graphene sheets are present as Brownian flat sheets, and there is no evidence of significant crumpling. More surprisingly, we find that the rate-dependent orientation of these molecularly thin sheets can be described by numerical predictions for hard spheroidal sheets, making quantitative predictions of the flow-induced orientation possible. Further comparison of the flow-induced orientation of thick gold decahedra with the thin graphene sheets shows that, except for effects of polydispersity, the flow-induced orientation is predicted well quantitatively. Adequate prediction of the effects of flow on the orientation of graphene sheets makes it possible to design wet processed graphene-based composite materials.

AB - Wet processing of graphene sheets is a potentially interesting route for the economically viable creation of graphene-based composites. In the present work, flow dichroism and small-angle light scattering are used to investigate the dispersion of functionalized graphene sheets in a suspension and their response to shear flow. In line with expectations from scaling theory at rest, the functionalized graphene sheets are present as Brownian flat sheets, and there is no evidence of significant crumpling. More surprisingly, we find that the rate-dependent orientation of these molecularly thin sheets can be described by numerical predictions for hard spheroidal sheets, making quantitative predictions of the flow-induced orientation possible. Further comparison of the flow-induced orientation of thick gold decahedra with the thin graphene sheets shows that, except for effects of polydispersity, the flow-induced orientation is predicted well quantitatively. Adequate prediction of the effects of flow on the orientation of graphene sheets makes it possible to design wet processed graphene-based composite materials.

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Rheo-optical Analysis of Functionalized Graphene Suspensions

Abstract

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