Self-assembled nanoparticle-coated interfaces: Capillary pressure, shell formation and buckling.
KAUST DepartmentEarth Science and Engineering Program
Earth Science and Engineering, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia
Permanent link to this recordhttp://hdl.handle.net/10754/664594
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AbstractHYPOTHESIS:Particle accumulation at liquid-liquid or liquid-gas interfaces can significantly alter capillary behavior and give rise to unusual interfacial phenomena including the asymmetric macroscopic mechanical response of the interface. EXPERIMENTS:This study explores the accumulation of cetyltrimethylammonium bromide-modified nanoparticles at fluid interfaces and the subsequent mechanical response of nanoparticle-coated droplets during contraction and expansion. Droplet tests involve the simultaneous recording of the droplet shape and the capillary pressure. Complementary single-pore experiments examine the response of particle-coated interfaces as they traverse a pore constriction. FINDINGS:Interfaces promote order. The time-dependent nanoparticle accumulation at the interface is diffusion-controlled. The nanoparticle coated droplets can sustain negative capillary pressure before they buckle. Buckling patterns strongly depend on the boundary conditions: non-slip boundary conditions lead to crumples while slip boundary conditions result in just a few depressions. The particle-coated interface exhibits asymmetric behavior in response to particle-level capillary forces: an "oil droplet in a nanofluid bath" withstands a significantly higher capillary pressure difference than a "nanofluid droplet in an oil bath". A first-order equilibrium analysis of interaction forces explains the asymmetric response. Single-constriction experiments show that the formation of particle-coated interfaces has a pronounced effect on fluid displacement in porous media.
CitationLiu, Q., Sun, Z., & Santamarina, J. C. (2021). Self-assembled nanoparticle-coated interfaces: Capillary pressure, shell formation and buckling. Journal of Colloid and Interface Science, 581, 251–261. doi:10.1016/j.jcis.2020.07.110
SponsorsSupport for this research was provided by the KAUST endowment. G. Abelskamp edited the manuscript. We are grateful to the anonymous reviewers for their detailed reviews and insightful observations.
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