Magneto-capillary dynamics of amphiphilic Janus particles at curved liquid interfaces

Soft Matter ◽  
2018 ◽  
Vol 14 (23) ◽  
pp. 4661-4665 ◽  
Author(s):  
Wenjie Fei ◽  
Michelle M. Driscoll ◽  
Paul M. Chaikin ◽  
Kyle J. M. Bishop
Keyword(s):  
Magnetic Particles ◽  
Janus Particles ◽  
Liquid Interfaces ◽  
Capillary Dynamics

Static homogeneous fields drive motions of magnetic particles along curved liquid interfaces.

Interfacial Assembly and Jamming Behavior of Polymeric Janus Particles at Liquid Interfaces

2017 ◽  
Vol 9 (38) ◽  
pp. 33327-33332 ◽  
Author(s):  
Yufeng Jiang ◽  
Tina I. Löbling ◽  
Caili Huang ◽  
Zhiwei Sun ◽  
Axel H. E. Müller ◽  
...  
Keyword(s):  
Janus Particles ◽  
Liquid Interfaces ◽  
Interfacial Assembly

Behavior of Janus Particles at Liquid Interfaces

2014 ◽  
Author(s):  
Hossein Rezvantalab ◽  
Shahab Shojaei-Zadeh
Keyword(s):  
Small Difference ◽  
Separation Distance ◽  
Janus Particles ◽  
Interface Plane ◽  
Fluid Interfaces ◽  
Liquid Interfaces ◽  
Ellipsoidal Particles ◽  
Particle Force ◽  
Energetic Interactions

We study the capillary-induced interactions and configuration of spherical and non-spherical Janus particles adsorbed at flat liquid-fluid interfaces. For Janus spheres, the equilibrium orientation results in each hemisphere being exposed to its more favored fluid. However, experimental observations suggest that some of these particles may take a tilted orientation at the interface, giving rise to a deformed interface. On the other hand, Janus ellipsoids with a large aspect ratio or a small difference in the wettability of the two regions tend to tilt even at equilibrium. The overlap of deformed menisci results in energetic interactions between neighboring particles. We numerically calculate the interface shape around the particles by minimizing the total surface energy of the system comprising of the interface and particle-fluid regions. We quantify these interactions through evaluation of capillary energy variation as a function of the orientation and separation distance between the particles. We find that Janus spheres with similar orientations undergo a relative realignment in the interface plane in order to minimize the capillary energy. In case of ellipsoidal particles, the particles assemble in a preferred side-by-side configuration. We evaluate the role of anisotropy and degree of amphiphilicity on the inter-particle force and the capillary torque. The results can be used to predict the migration and oriented assembly of Janus particles with various geometrical and surface properties at liquid-fluid interfaces.

scholarly journals Patterned surface anchoring of nematic droplets at miscible liquid–liquid interfaces

Soft Matter ◽  
2017 ◽  
Vol 13 (34) ◽  
pp. 5714-5723 ◽  
Author(s):  
Xiaoguang Wang ◽  
Ye Zhou ◽  
Young-Ki Kim ◽  
Daniel S. Miller ◽  
Rui Zhang ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Nematic Liquid Crystal ◽  
Janus Particles ◽  
Liquid Interfaces ◽  
Glycerol Water ◽  
Surface Anchoring ◽  
Patterned Surface

The internal configurations assumed by nematic liquid crystal droplets at glycerol–water interfaces can be polymerized, leading to polymeric Janus particles.

scholarly journals Influence of magnetic field on the orientation of anisotropic magnetic particles at liquid interfaces

2014 ◽  
Vol 16 (47) ◽  
pp. 26051-26058 ◽  
Author(s):  
Bethany J. Newton ◽  
Kenneth A. Brakke ◽  
D. Martin A. Buzza
Keyword(s):  
Magnetic Field ◽  
Magnetic Particles ◽  
High Accuracy ◽  
Liquid Interfaces ◽  
Surface Evolver ◽  
Orientational Transition

High accuracy Surface Evolver calculations of the orientational transition for anisotropic magnetic particles at liquid interfaces.

Janus Particles at Liquid−Liquid Interfaces

Langmuir ◽  
2006 ◽  
Vol 22 (12) ◽  
pp. 5227-5229 ◽  
Author(s):  
Nicole Glaser ◽  
Dave J. Adams ◽  
Alexander Böker ◽  
Georg Krausch
Keyword(s):  
Janus Particles ◽  
Liquid Interfaces

A magnetic super lattice

1987 ◽  
Vol 45 ◽  
pp. 360-361 ◽  
Author(s):  
M.D. Bentzon ◽  
J. v. Wonterghem ◽  
A. Thölén
Keyword(s):  
Thermal Decomposition ◽  
Oleic Acid ◽  
Magnetic Fluid ◽  
Magnetic Particles ◽  
Carbon Film ◽  
Thick Layer ◽  
Amorphous Iron ◽  
Super Lattice ◽  
Carrier Liquid ◽  
Median Diameter

We report on the oxidation of a magnetic fluid. The oxidation results in magnetic super lattice crystals. The “atoms” are hematite (α-Fe2O3) particles with a diameter ø = 6.9 nm and they are covered with a 1-2 nm thick layer of surfactant molecules.Magnetic fluids are homogeneous suspensions of small magnetic particles in a carrier liquid. To prevent agglomeration, the particles are coated with surfactant molecules. The magnetic fluid studied in this work was produced by thermal decomposition of Fe(CO)5 in Declin (carrier liquid) in the presence of oleic acid (surfactant). The magnetic particles consist of an amorphous iron-carbon alloy. For TEM investigation a droplet of the fluid was added to benzine and a carbon film on a copper net was immersed. When exposed to air the sample starts burning. The oxidation and electron irradiation transform the magnetic particles into hematite (α-Fe2O3) particles with a median diameter ø = 6.9 nm.

EFFECT OF APPLICATION OF FIELDS ON THE DOMAIN STRUCTURE IN SMALL REGULARLY SHAPED MAGNETIC PARTICLES

1988 ◽  
Vol 49 (C8) ◽  
pp. C8-1817-C8-1818 ◽  
Author(s):  
S. McVitie ◽  
J. N. Chapman ◽  
S. J. Hefferman ◽  
W. A. P. Nicholson
Keyword(s):  
Domain Structure ◽  
Magnetic Particles

Analysis of magneto rheological elastomers for energy harvesting systems

2020 ◽  
Vol 64 (1-4) ◽  
pp. 439-446
Author(s):  
Gildas Diguet ◽  
Gael Sebald ◽  
Masami Nakano ◽  
Mickaël Lallart ◽  
Jean-Yves Cavaillé
Keyword(s):  
Magnetic Field ◽  
Energy Harvesting ◽  
Shear Strain ◽  
Magnetic Induction ◽  
Magnetic Particles ◽  
Homogeneous Magnetic Field ◽  
Electrical Signal ◽  
Harvesting Systems ◽  
Dc Bias ◽  
Magneto Rheological

Magneto Rheological Elastomers (MREs) are composite materials based on an elastomer filled by magnetic particles. Anisotropic MRE can be easily manufactured by curing the material under homogeneous magnetic field which creates column of particles. The magnetic and elastic properties are actually coupled making these MREs suitable for energy conversion. From these remarkable properties, an energy harvesting device is considered through the application of a DC bias magnetic induction on two MREs as a metal piece is applying an AC shear strain on them. Such strain therefore changes the permeabilities of the elastomers, hence generating an AC magnetic induction which can be converted into AC electrical signal with the help of a coil. The device is simulated with a Finite Element Method software to examine the effect of the MRE parameters, the DC bias magnetic induction and applied shear strain (amplitude and frequency) on the resulting electrical signal.

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