Physical ageing of the contact line on colloidal particles at liquid interfaces

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Physical ageing of the contact line on colloidal particles at liquid interfaces"


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ABSTRACT Young’s law1 predicts that a colloidal sphere in equilibrium with a liquid interface will straddle the two fluids, its height above the interface defined by an equilibrium contact


angle2. This has been used to explain why colloids often bind to liquid interfaces3,4, and has been exploited in emulsification5, water purification6, mineral recovery7, encapsulation8 and


the making of nanostructured materials9,10. However, little is known about the dynamics of binding. Here we show that the adsorption of polystyrene microspheres to a water/oil interface is


characterized by a sudden breach and an unexpectedly slow relaxation. The relaxation appears logarithmic in time, indicating that complete equilibration may take months. Surprisingly,


viscous dissipation appears to play little role. Instead, the observed dynamics, which bear strong resemblance to ageing in glassy systems, agree well with a model describing activated


hopping of the contact line over nanoscale surface heterogeneities. These results may provide clues to longstanding questions on colloidal interactions at an interface11,12. Access through


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CONTENT BEING VIEWED BY OTHERS DIRECT MEASUREMENTS OF THE COLLOIDAL DEBYE FORCE Article Open access 29 June 2023 NONEQUILIBRIUM CONTINUOUS PHASE TRANSITION IN COLLOIDAL GELATION WITH


SHORT-RANGE ATTRACTION Article Open access 16 July 2020 A UNIFIED STATE DIAGRAM FOR THE YIELDING TRANSITION OF SOFT COLLOIDS Article 27 July 2023 REFERENCES * Young, T. An essay on the


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air–water interface: The consequence of an irregular meniscus. _Phys. Rev. E_ 62, 5263–5272 (2000). Article  CAS  Google Scholar  Download references ACKNOWLEDGEMENTS We thank S. Ghosh for


his help in the work that inspired these experiments; L. DeLorenzo for her work on sample cell prototypes; S. Rubinstein and H. Stone for critical discussions; and J. MacArthur and S. 


Cotreau for guidance in construction of the apparatus. This work was supported by the National Science Foundation under CAREER award number CBET-0747625 as well as through the Harvard MRSEC


under award number DMR-0820484. AUTHOR INFORMATION Author notes * Madhav Mani Present address: Present address: Kavli Institute for Theoretical Physics, Department of Physics, University of


California, Santa Barbara, California 93106, USA, * David M. Kaz and Ryan McGorty: These authors contributed equally to this work AUTHORS AND AFFILIATIONS * Department of Physics, Harvard


University, Cambridge, Massachusetts 02138, USA David M. Kaz, Ryan McGorty & Vinothan N. Manoharan * School of Engineering and Applied Sciences, Harvard University, Cambridge,


Massachusetts 02138, USA Madhav Mani, Michael P. Brenner & Vinothan N. Manoharan Authors * David M. Kaz View author publications You can also search for this author inPubMed Google


Scholar * Ryan McGorty View author publications You can also search for this author inPubMed Google Scholar * Madhav Mani View author publications You can also search for this author


inPubMed Google Scholar * Michael P. Brenner View author publications You can also search for this author inPubMed Google Scholar * Vinothan N. Manoharan View author publications You can


also search for this author inPubMed Google Scholar CONTRIBUTIONS R.M. and D.M.K. designed the experimental apparatus, analysed the data and interpreted the results. M.M. led the development


of the model and assisted with interpretation of the data. M.P.B. advised on the model and manuscript. V.N.M. directed the experiments and their interpretation. All authors collaborated on


the manuscript. CORRESPONDING AUTHORS Correspondence to Madhav Mani or Vinothan N. Manoharan. ETHICS DECLARATIONS COMPETING INTERESTS The authors declare no competing financial interests.


SUPPLEMENTARY INFORMATION SUPPLEMENTARY INFORMATION Supplementary Information (PDF 616 kb) RIGHTS AND PERMISSIONS Reprints and permissions ABOUT THIS ARTICLE CITE THIS ARTICLE Kaz, D.,


McGorty, R., Mani, M. _et al._ Physical ageing of the contact line on colloidal particles at liquid interfaces. _Nature Mater_ 11, 138–142 (2012). https://doi.org/10.1038/nmat3190 Download


citation * Received: 07 June 2011 * Accepted: 31 October 2011 * Published: 04 December 2011 * Issue Date: February 2012 * DOI: https://doi.org/10.1038/nmat3190 SHARE THIS ARTICLE Anyone you


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