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Smart Cellulose Nanofluids Produced by Tunable Hydrophobic Association of Polymer-Grafted Cellulose Nanocrystals

Cellulose fibrils, unique plant-derived semicrystalline nanomaterials with exceptional mechanical properties, have significant potential for rheology modification of complex fluids due to their ability to form a physically associated semiflexible fibrillary network. Here, we report new associative c...

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Published in:ACS applied materials & interfaces 2017-09, Vol.9 (36), p.31095-31101
Main Authors: Lee, Yea Ram, Park, Daehwan, Choi, Sang Koo, Kim, Miju, Baek, Heung Soo, Nam, Jin, Chung, Chan Bok, Osuji, Chinedum O, Kim, Jin Woong
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cited_by cdi_FETCH-LOGICAL-a396t-fe139c62922fc2a2417bc897b4328d4cf99e1ae5f1234f45451f16e89dc714143
cites cdi_FETCH-LOGICAL-a396t-fe139c62922fc2a2417bc897b4328d4cf99e1ae5f1234f45451f16e89dc714143
container_end_page 31101
container_issue 36
container_start_page 31095
container_title ACS applied materials & interfaces
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creator Lee, Yea Ram
Park, Daehwan
Choi, Sang Koo
Kim, Miju
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Osuji, Chinedum O
Kim, Jin Woong
description Cellulose fibrils, unique plant-derived semicrystalline nanomaterials with exceptional mechanical properties, have significant potential for rheology modification of complex fluids due to their ability to form a physically associated semiflexible fibrillary network. Here, we report new associative cellulose nanocrystals (ACNCs) with stress-responsive rheological behaviors in an aqueous solution. The surface-mediated living radical polymerization was employed to graft poly­(stearyl methacrylate-co-2-methacryloxyethyl phosphorylcholine) brushes onto the nanofibrils, and then 2,2,6,6-tetramethylpiperidine-1-oxyl radical (TEMPO)-mediated oxidation was conducted to produce nanoscale ACNCs in the aqueous solution. The ACNCs displayed interfibril association driven by the hydrophobic interaction that resulted in the formation of a nanofibrillar crystalline gel phase. We observed that the viscosity of the ACNC fluid showed reversible shear thinning and temperature-induced thickening in response to applied shear stress and thermal shock. Moreover, thanks to generation of a mechanically robust nanofibrillar crystalline gel network, the ACNC suspension showed extraordinary stability to changes in salinity and pH. These results highlighted that the interfibril hydrophobic association of ACNCs was vital and played an essential role in regulation of stimuli-responsive sol–gel transitions.
doi_str_mv 10.1021/acsami.7b08783
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title Smart Cellulose Nanofluids Produced by Tunable Hydrophobic Association of Polymer-Grafted Cellulose Nanocrystals
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