TY - GEN
T1 - Two-particle interfacial microrheology at polymer-polymer interfaces
AU - Song, Yanmei
AU - Dai, Lenore
PY - 2010/12/1
Y1 - 2010/12/1
N2 - 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.
AB - 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.
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M3 - Conference contribution
AN - SCOPUS:78751510698
SN - 9780816910656
T3 - AIChE Annual Meeting, Conference Proceedings
BT - 10AIChE - 2010 AIChE Annual Meeting, Conference Proceedings
T2 - 2010 AIChE Annual Meeting, 10AIChE
Y2 - 7 November 2010 through 12 November 2010
ER -