Non-equilibrium concentration fluctuations in superparamagnetic nanocolloids

. We investigate non-equilibrium concentration fluctuations during the free diffusion of a colloidal suspension against pure water. We investigate Fe 2 O 3 superparamagnetic nanocolloids with sizes between 1 and 10 nm by means of a shadowgraph apparatus to determine the mixture mass diffusion coeffi...

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Bibliographic Details
Published in:The European physical journal. E, Soft matter and biological physics Soft matter and biological physics, 2017-02, Vol.40 (2), p.14-11, Article 14
Main Authors: Oprisan, Ana, Rice, Ashley, Oprisan, Sorinel A., Giraudet, Cédric, Croccolo, Fabrizio
Format: Article
Language:English
Subjects:
Biological and Medical Physics
Biophysics
Colloids
Colloids - chemistry
Complex Fluids and Microfluidics
Complex Systems
Condensed matter physics
Diffusion coefficient
Diffusion rate
Ferric Compounds - chemistry
Kinematics
Magnetic Fields
Nanostructures - chemistry
Nanotechnology
Non-isothermal transport in complex fluids
Physics
Physics and Astronomy
Polymer Sciences
Regular Article
Soft and Granular Matter
Surfaces and Interfaces
Thin Films
Viscosity
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Summary:. We investigate non-equilibrium concentration fluctuations during the free diffusion of a colloidal suspension against pure water. We investigate Fe 2 O 3 superparamagnetic nanocolloids with sizes between 1 and 10 nm by means of a shadowgraph apparatus to determine the mixture mass diffusion coefficient and kinematic viscosity. The experiments were performed in three distinct conditions: Experiment 1 is without any magnetic field; Experiment 2 with a vertical magnetic field; Experiment 3 after turning off the magnetic field. We found no correlation between the kinematic viscosity coefficient and the external magnetic field. Conversely, we found that the mass diffusion coefficient decreases in the presence of the external magnetic field and slowly rebounds after the magnetic field was turned off. Graphical abstract
ISSN:1292-8941
1292-895X
DOI:10.1140/epje/i2017-11503-y