Journal
JOURNAL OF RHEOLOGY
Volume 60, Issue 1, Pages 141-159Publisher
JOURNAL RHEOLOGY AMER INST PHYSICS
DOI: 10.1122/1.4937931
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Funding
- National Science Foundation [CBET-932259]
- NSF MRSEC program [DMR-0520415]
- National Institutes of Health [HL-51177]
- Camille and Henry Dreyfus Teacher-Scholar program
- Dow Chemical Company through the Dow Materials Institute at UCSB
- NSF Materials Research Science and Engineering Centers Program [DMR 1121053]
- NSF
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We describe a microrheological strategy that enables sensitive surface shear rheology measurements of surfactant-laden interfaces, with the capacity to simultaneously visualize deforming interfaces. This technique utilizes a ferromagnetic microbutton probe pinned to a fluid-fluid interface, and actively torqued or forced with externally controlled electromagnets. Various modes of operation are possible: Small amplitude oscillatory rotations, which provide frequency-dependent viscoelastic shear moduli; controlled torque (analogous to fixing shear stress); controlled rotation rate (analogous to fixing strain rate); and imposed force (analogous to active, translational microrheology). The circular shape of the probe ensures pure shear strains (when driven to rotate). We describe the experimental apparatus, its measurement limits and sources of error. We then highlight its versatility and capabilities with measurements on a variety of qualitatively distinct systems, including purely viscous monolayers, block-copolymer interfaces, aging and evolving interfaces, colloidal monolayers, and bulk rheometry of Newtonian and viscoelastic materials, with sample volumes as small as 2 mu l. (C) 2016 The Society of Rheology.
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