TY - JOUR
T1 - Bubble dynamics for broadband microrheology of complex fluids
AU - Saint-Michel, Brice
AU - Garbin, Valeria
PY - 2020
Y1 - 2020
N2 - Bubbles in complex fluids are often desirable, and sometimes simply inevitable, in the processing of formulated products. Bubbles can rise by buoyancy, grow or dissolve by mass transfer, and readily respond to changes in pressure, thereby applying a deformation to the surrounding complex fluid. The deformation field around a stationary, spherical bubble undergoing a change in radius is simple and localized, thus making it suitable for rheological measurements. This article reviews emerging approaches to extract information on the rheology of complex fluids by analysing bubble dynamics. The focus is on three phenomena: changes in radius by mass transfer, harmonic oscillations driven by an acoustic wave, and bubble collapse. These phenomena cover a broad range of deformation frequencies, from 10−4–106 Hz, thus paving the way to broadband microrheology using bubbles as active probes. The outstanding challenges that need to be overcome to achieve a robust technique are also discussed.
AB - Bubbles in complex fluids are often desirable, and sometimes simply inevitable, in the processing of formulated products. Bubbles can rise by buoyancy, grow or dissolve by mass transfer, and readily respond to changes in pressure, thereby applying a deformation to the surrounding complex fluid. The deformation field around a stationary, spherical bubble undergoing a change in radius is simple and localized, thus making it suitable for rheological measurements. This article reviews emerging approaches to extract information on the rheology of complex fluids by analysing bubble dynamics. The focus is on three phenomena: changes in radius by mass transfer, harmonic oscillations driven by an acoustic wave, and bubble collapse. These phenomena cover a broad range of deformation frequencies, from 10−4–106 Hz, thus paving the way to broadband microrheology using bubbles as active probes. The outstanding challenges that need to be overcome to achieve a robust technique are also discussed.
KW - Bubbles
KW - Cavitation
KW - Extensional rheology
KW - Gas diffusion
KW - High-frequency rheology
KW - Microrheology
KW - Ultrasound
UR - http://www.scopus.com/inward/record.url?scp=85095442806&partnerID=8YFLogxK
U2 - 10.1016/j.cocis.2020.101392
DO - 10.1016/j.cocis.2020.101392
M3 - Review article
AN - SCOPUS:85095442806
SN - 1359-0294
VL - 50
JO - Current Opinion in Colloid and Interface Science
JF - Current Opinion in Colloid and Interface Science
M1 - 101392
ER -