Filling the gap between transient and steady shear rheology of aqueous graphene oxide dispersions

Cited 0 time in webofscience Cited 0 time in scopus
86 Viewed 19 Downloaded
Title
Filling the gap between transient and steady shear rheology of aqueous graphene oxide dispersions
Author(s)
Francesco Del Giudice; Benjamin V. Cunning; Rodney S. Ruoff; Amy Q. Shen
Publication Date
2018-04
Journal
RHEOLOGICA ACTA, v.57, no.4, pp.293 - 306
Publisher
SPRINGER
Abstract
Even though the rheological behavior of aqueous graphene oxide (G-O) dispersions has been shown to be strongly time-dependent, only few transient measurements have been reported in the literature. In this work, we attempt to fill the gap between transient and steady shear rheological characterizations of aqueous G-O dispersions in the concentration range of 0.004 < ϕ < 3.5 wt%, by conducting comprehensive rheological measurements, including oscillatory shear flow, transient shear flow, and steady shear flow. Steady shear measurements have been performed after the evaluation of transient properties of the G-O dispersions, to assure steady-state conditions. We identify the critical concentration ϕc = 0.08 wt% (where G-O sheets start to interact) from oscillatory shear experiments. We find that the rheology of G-O dispersions strongly depends on the G-O concentration ϕ. Transient measurements of shear viscosity and first normal stress difference suggest that G-O dispersions behave like nematic polymeric liquid crystals at ϕ/ϕc = 25, in agreement with other work reported in the literature. G-O dispersions also display a transition from negative to positive values of the first normal stress difference with increasing shear rates. Experimental findings of aqueous graphene oxide dispersions are compared and discussed with models and experiments reported for nematic polymeric liquid crystals, laponite, and organoclay dispersions. © 2018 Springer-Verlag GmbH Germany, part of Springer Natur
URI
https://pr.ibs.re.kr/handle/8788114/4565
ISSN
0035-4511
Appears in Collections:
Center for Multidimensional Carbon Materials(다차원 탄소재료 연구단) > Journal Papers (저널논문)
Files in This Item:
7. 10.1007_s00397-018-1077-9.pdfDownload

qrcode

  • facebook

    twitter

  • Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.
해당 아이템을 이메일로 공유하기 원하시면 인증을 거치시기 바랍니다.

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.

Browse