Equilibrium Orientation of Nonspherical Janus Particles at Fluid–Fluid Interfaces

ACS Nano ◽  
2011 ◽  
Vol 6 (1) ◽  
pp. 782-790 ◽  
Author(s):  
Bum Jun Park ◽  
Daeyeon Lee
Keyword(s):  
Janus Particles ◽  
Fluid Interfaces

Surface activity of Janus particles adsorbed at fluid–fluid interfaces: Theoretical and experimental aspects

2016 ◽  
Vol 233 ◽  
pp. 240-254 ◽  
Author(s):  
Miguel Angel Fernandez-Rodriguez ◽  
Miguel Angel Rodriguez-Valverde ◽  
Miguel Angel Cabrerizo-Vilchez ◽  
Roque Hidalgo-Alvarez
Keyword(s):  
Surface Activity ◽  
Janus Particles ◽  
Fluid Interfaces

Capillary interactions between spherical Janus particles at liquid–fluid interfaces

Soft Matter ◽  
2013 ◽  
Vol 9 (13) ◽  
pp. 3640 ◽  
Author(s):  
Hossein Rezvantalab ◽  
Shahab Shojaei-Zadeh
Keyword(s):  
Janus Particles ◽  
Fluid Interfaces ◽  
Capillary Interactions

Amphiphilic Janus particles at fluid interfaces

Soft Matter ◽  
2013 ◽  
Vol 9 (29) ◽  
pp. 6604 ◽  
Author(s):  
Ankit Kumar ◽  
Bum Jun Park ◽  
Fuquan Tu ◽  
Daeyeon Lee
Keyword(s):  
Janus Particles ◽  
Fluid Interfaces

scholarly journals Controlled capillary assembly of magnetic Janus particles at fluid–fluid interfaces

Soft Matter ◽  
2016 ◽  
Vol 12 (31) ◽  
pp. 6566-6574 ◽  
Author(s):  
Qingguang Xie ◽  
Gary B. Davies ◽  
Jens Harting
Keyword(s):  
Janus Particles ◽  
Fluid Interfaces

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 Janus Particles at Fluid Interfaces: Stability and Interfacial Rheology

Nanomaterials ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 374
Author(s):  
Elton L. Correia ◽  
Nick Brown ◽  
Sepideh Razavi
Keyword(s):  
Colloidal Particles ◽  
Janus Particles ◽  
Shear Stresses ◽  
Fluid Interfaces ◽  
Interfacial Rheology ◽  
Pickering Emulsions ◽  
Interfacial Mechanics ◽  
Anisotropic Surface ◽  
Particle Anisotropy

The use of the Janus motif in colloidal particles, i.e., anisotropic surface properties on opposite faces, has gained significant attention in the bottom-up assembly of novel functional structures, design of active nanomotors, biological sensing and imaging, and polymer blend compatibilization. This review is focused on the behavior of Janus particles in interfacial systems, such as particle-stabilized (i.e., Pickering) emulsions and foams, where stabilization is achieved through the binding of particles to fluid interfaces. In many such applications, the interface could be subjected to deformations, producing compression and shear stresses. Besides the physicochemical properties of the particle, their behavior under flow will also impact the performance of the resulting system. This review article provides a synopsis of interfacial stability and rheology in particle-laden interfaces to highlight the role of the Janus motif, and how particle anisotropy affects interfacial mechanics.

Equilibrium configurations and capillary interactions of Janus dumbbells and spherocylinders at fluid–fluid interfaces

Soft Matter ◽  
2019 ◽  
Vol 15 (12) ◽  
pp. 2638-2647 ◽  
Author(s):  
Carmine Anzivino ◽  
Fuqiang Chang ◽  
Giuseppe Soligno ◽  
René van Roij ◽  
Willem K. Kegel ◽  
...  
Keyword(s):  
Numerical Method ◽  
Experimental Results ◽  
Janus Particles ◽  
Fluid Interfaces ◽  
Fluid Interface ◽  
Equilibrium Configurations ◽  
Capillary Interactions ◽  
Good Agreement

We numerically investigate the adsorption of a variety of Janus particles (dumbbells, elongated dumbbells and spherocylinders) at a fluid–fluid interface by using a numerical method that takes into account the interfacial deformations. We also experimentally synthesize micrometer–sized charged Janus dumbbells and let them adsorb at a water–decane interface. We find a good agreement between numerical and experimental results.

Orientation and surface activity of Janus particles at fluid-fluid interfaces

2014 ◽  
Vol 141 (13) ◽  
pp. 134907 ◽  
Author(s):  
Hui-Min Gao ◽  
Zhong-Yuan Lu ◽  
Hong Liu ◽  
Zhao-Yan Sun ◽  
Li-Jia An
Keyword(s):  
Surface Activity ◽  
Janus Particles ◽  
Fluid Interfaces

scholarly journals Tunable dipolar capillary deformations for magnetic Janus particles at fluid–fluid interfaces

Soft Matter ◽  
2015 ◽  
Vol 11 (18) ◽  
pp. 3581-3588 ◽  
Author(s):  
Qingguang Xie ◽  
Gary B. Davies ◽  
Florian Günther ◽  
Jens Harting
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Present Theory ◽  
Janus Particles ◽  
Fluid Interfaces ◽  
Capillary Interactions

We present theory and simulations describing the behaviour of magnetic Janus particles adsorbed at fluid–fluid interfaces interacting with an external magnetic field. We show that the particles deform the interface in a dipolar manner and suggest how to utilise capillary interactions to create novel, reconfigurable materials.

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