Journal
LIQUID CRYSTALS
Volume 42, Issue 2, Pages 261-269Publisher
TAYLOR & FRANCIS LTD
DOI: 10.1080/02678292.2014.984355
Keywords
lyotropic; flow-induced ordering; graphene oxide dispersion
Funding
- Basic Science Research Program through the National Research Foundation of Korea (NRF) - Ministry of Education [2012R1A1A1012167]
- Technology Innovation Program - Ministry of Knowledge Economy (MKE, Korea) [10041596]
- Korea Evaluation Institute of Industrial Technology (KEIT) [10041596] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2012R1A1A1012167] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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We measured the S- and P-order parameters of flow-induced ordered graphene oxide (GO) particles and the flow velocity profiles for a flowing aqueous GO dispersion in a tube, by using an optical method. The order parameters clearly exhibit increasing concentric biaxial ordering as the flow velocity increases, with the exception of a disordered centre. Newtonian to non-Newtonian transition in the flow velocity profile is found, changing from a parabolic shape to a fuller shape at very low Reynolds numbers less than 10. This is attributed to the shear thinning effect (i.e., an ordering-induced reduction in viscosity). In the Newtonian flow, a uniaxial ordering was dominant; whereas a biaxial ordering sharply increased in the non-Newtonian flow, indicating that both the ordering of GO particles and the interparticle interactions influence the flow profile transition.
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