Two-particle interfacial microrheology at polymer-polymer interfaces

Yanmei Song, Lenore Dai

Research output: Chapter in Book/Report/Conference proceedingConference contribution


We continue to develop two-particle interfacial microrheology and have applied the technique to study the interfacial viscoelastic properties of immiscible polydimethylsiloxane (PDMS) - polyethylene glycol (PEG) interfaces. The interfacial storage and loss moduli are measured over a wide frequency range: at low frequencies, the interfaces are dominated by viscous responses whereas elasticity dominates at high frequencies. The zero-shear interfacial viscosity, estimated from the Cross model, falls between the bulk viscosities of two individual polymers. Surprisingly, the interfacial relaxation time, estimated from the crossover of the storage and loss moduli, is observed to be an order of magnitude larger than that of the PDMS bulk polymers. The effects of tracer particle surface chemistry and size have also been investigated and show minimum influences on two-particle interfacial microrheology.

Original languageEnglish (US)
Title of host publication10AIChE - 2010 AIChE Annual Meeting, Conference Proceedings
StatePublished - Dec 1 2010
Event2010 AIChE Annual Meeting, 10AIChE - Salt Lake City, UT, United States
Duration: Nov 7 2010Nov 12 2010

Publication series

NameAIChE Annual Meeting, Conference Proceedings


Other2010 AIChE Annual Meeting, 10AIChE
Country/TerritoryUnited States
CitySalt Lake City, UT

ASJC Scopus subject areas

  • General Chemical Engineering
  • General Chemistry


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