Journal
PHYSICAL REVIEW MATERIALS
Volume 1, Issue 7, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevMaterials.1.073804
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Funding
- Italian Ministry of University and Scientific Research (MIUR) [RBFR125H0M]
- Regione Lombardia [2016-0998]
- CARIPLO foundation [2016-0998]
- Swiss National Science Foundation [200021-157214]
- Swiss National Science Foundation (SNF) [200021_157214] Funding Source: Swiss National Science Foundation (SNF)
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Particle-tracking microrheology (PT-mu r) exploits the thermal motion of embedded particles to probe the local mechanical properties of soft materials. Despite its appealing conceptual simplicity, PT-mu r requires calibration procedures and operating assumptions that constitute a practical barrier to its wider application. Here we demonstrate differential dynamic microscopy microrheology (DDM-mu r), a tracking-free approach based on the multiscale, temporal correlation study of the image intensity fluctuations that are observed in microscopy experiments as a consequence of the translational and rotational motion of the tracers. We show that the mechanical moduli of an arbitrary sample are determined correctly over a wide frequency range provided that the standard DDM analysis is reinforced with an iterative, self-consistent procedure that fully exploits the multiscale information made available by DDM. Our approach to DDM-mu r does not require any prior calibration, is in agreement with both traditional rheology and diffusing wave spectroscopy microrheology, and works in conditions where PT-mu r fails, providing thus an operationally simple, calibration-free probe of soft materials.
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