Ultra‐Soft Liquid‐Ferrofluid Interfaces

Soft interfaces are ubiquitous in nature, governing quintessential hydrodynamics functions, like lubrication, stability, and cargo transport. It is shown here how a magnetic pressure at a magnetic–nonmagnetic fluid interface results in an ultra‐soft interface with nonlinear elasticity and tunable vi...

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Bibliographic Details
Published in:Advanced functional materials 2024-11, Vol.34 (48), p.n/a
Main Authors: Dev, Arvind Arun, Hermans, Thomas M., Doudin, Bernard
Format: Article
Language:English
Subjects:
Biomedical materials
Elasticity
ferrofluid
Ferrofluids
Formability
Interface stability
liquid–liquid interface stability
Magnetic properties
Shear properties
soft deformable interface
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Summary:Soft interfaces are ubiquitous in nature, governing quintessential hydrodynamics functions, like lubrication, stability, and cargo transport. It is shown here how a magnetic pressure at a magnetic–nonmagnetic fluid interface results in an ultra‐soft interface with nonlinear elasticity and tunable viscous shear properties. The balance between magnetic pressure, viscous stress, and Laplace pressure results in a deformed and stable liquid‐in‐liquid tube with apparent elasticity in the range of 2–10 kPa, possibly extended by a proper choice of liquid properties. Such highly deformable liquid–liquid interfaces of arbitrary shape with vanishing viscous shear open doors to unique microfluidic phenomena, biomaterial flows and complex biosystems mimicking. A deformable, soft, and slippery liquid‐ferrofluid interface is engineered, which deforms reversibly (at different flow rates) and results in a novel fluid‐(soft) structure interaction. The experiments are backed by an analytical model that predicts deformations driven by the balance between magnetic pressure and viscous shear stress. The liquid‐liquid interface can be employed for biomimicking, flow chemistry, and interface fluid physics applications.
ISSN:1616-301X
1616-3028
DOI:10.1002/adfm.202411811