Abstract
Self-assembly of surfactant molecules into micelles of various shapes and forms has been extensively used to synthesize soft nanomaterials. Translucent solutions containing rod-like surfactant micelles can self-organize under flow to form viscoelastic gels. This flow-induced structure (FIS) formation has excited much fundamental research and pragmatic interest as a cost-effective manufacturing route for active nanomaterials. However, its practical impact has been very limited because all reported FIS transitions are reversible because the gel disintegrates soon after flow stoppage. We present a new microfluidics-assisted robust laminar-flow process, which allows for the generation of extension rates many orders of magnitude greater than is realizable in conventional devices, to produce purely flow-induced permanent nanogels. Cryogenic transmission electron microscopy imaging of the gel reveals a partially aligned micelle network. The critical flow rate for gel formation is consistent with the Turner–Cates fusion mechanism, proposed originally to explain reversible FIS formation in rod-like micelle solutions.
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Acknowledgements
We gratefully acknowledge NSF grants CBET 0404243 (A.Q.S., R.S.), CBET 0853735 (R.S.), CBET CAREER 0645062 (A.Q.S.) and DMI CAREER 0449258 (R.K., H.K.) for support of this work. R.S. acknowledges insightful discussions with R. G. Larson and Z. Wang during his sabbatical at University of Michigan, Ann Arbor, and M. Cates and A. Morozov during his visit to University of Edinburgh.
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M.V., R.S. and A.Q.S. planned and designed the microfluidic experiments. M.V. carried out rheological characterization and microfluidic experiments with the help of E.B., analysed and interpreted the data as well as prepared the manuscript under the guidance of R.S., A.Q.S. and B.K. M.V. and H.K. conducted AFM characterization of the dried gel under the guidance of R.K. D.L. carried out cryo-TEM imaging of the gel and interpreted the data with guidance from A.Q.S. and R.S.
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Vasudevan, M., Buse, E., Lu, D. et al. Irreversible nanogel formation in surfactant solutions by microporous flow. Nature Mater 9, 436–441 (2010). https://doi.org/10.1038/nmat2724
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DOI: https://doi.org/10.1038/nmat2724
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