2020
DOI: 10.1021/acs.langmuir.0c01555
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Surfactant Driven Liquid to Soft Solid Transition of Cellulose Nanocrystal Suspensions

Abstract: Cellulose nanocrystals (CNCs) have recently attracted wide interest due to their abundance, biocompatibility, and extraordinary physical properties. In particular, easy manipulation of their surface properties, hydrophilicity, and high aspect ratio make them ideal rheology modifiers; yet, the gelation mechanisms and microscopic origin of the complex rheological behavior in the presence of secondary components, such as polymers and surfactants, are far from well understood. In this work, we used light scatterin… Show more

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Cited by 13 publications
(11 citation statements)
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“…Figure 1c shows also the hydrodynamic size of the CNC (35.1 ± 12 nm). ζ-potential for CNC is strongly negative ζ (−45.2 ± 0.97 mV 17 ), whereas Pluronic F127 micelles are practically neutral (ζpotentials were found to be −0.48 ± 0.03 mV and −0.50 ± 0.19 mV at 37 and 50 °C, respectively). The primary means of interaction between the Pluronic micelles and CNC is, thus, not electrostatic, unlike previously reported charged surfactant−CNC systems, which results in gelation of nanocrystal suspensions through strong Coulomb interaction.…”
Section: ■ Results and Discussionmentioning
confidence: 98%
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“…Figure 1c shows also the hydrodynamic size of the CNC (35.1 ± 12 nm). ζ-potential for CNC is strongly negative ζ (−45.2 ± 0.97 mV 17 ), whereas Pluronic F127 micelles are practically neutral (ζpotentials were found to be −0.48 ± 0.03 mV and −0.50 ± 0.19 mV at 37 and 50 °C, respectively). The primary means of interaction between the Pluronic micelles and CNC is, thus, not electrostatic, unlike previously reported charged surfactant−CNC systems, which results in gelation of nanocrystal suspensions through strong Coulomb interaction.…”
Section: ■ Results and Discussionmentioning
confidence: 98%
“…In the presence of CNC up to 3% (where CNC disperse rather individually), the hydrophobic sections of CNC can attract hydrophobic PPO sections upon increasing temperature, and the energy cost associated with the micelle formation decreases. At 4%, the CNC solutions exhibit a viscoelastic behavior with crossover frequency at about 1 Hz, and further increase of the concentration yields a less frequency-dependent moduli and with G ′ > G ″, a characteristic of a gellike material . The CNC gel results from a formation of a percolated network structure of the nanocrystals, and CNC meshes start forming above 3%.…”
Section: Resultsmentioning
confidence: 99%
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