scholarly journals Orientation-dependent induced-charge electrophoresis of magnetic metal-coated Janus particles with different coating thicknesses

RSC Advances ◽  
2017 ◽  
Vol 7 (73) ◽  
pp. 46118-46123 ◽  
Author(s):  
Chia-Hsien Lin ◽  
Yu-Liang Chen ◽  
Hong-Ren Jiang
Keyword(s):  
Metallic Coating ◽  
Janus Particles ◽  
Janus Particle ◽  
Magnetic Metal ◽  
Induced Charge

The ICEP behavior of the metal-coated Janus particle is dominated by the thickness of its metallic coating and its orientation.

scholarly journals Programmed assembly of oppositely charged homogeneously decorated and Janus particles

2016 ◽  
Vol 191 ◽  
pp. 89-104 ◽  
Author(s):  
Alina Kirillova ◽  
Georgi Stoychev ◽  
Alla Synytska
Keyword(s):  
Optical Properties ◽  
Electrostatic Interactions ◽  
Building Blocks ◽  
Janus Particles ◽  
Complex Structures ◽  
Janus Particle ◽  
Micro Structures ◽  
Oppositely Charged ◽  
Particle Assemblies ◽  
Programmed Assembly

The exploitation of colloidal building blocks with morphological and functional anisotropy facilitates the generation of complex structures with unique properties, which are not exhibited by isotropic particle assemblies. Herein, we demonstrate an easy and scalable bottom-up approach for the programmed assembly of hairy oppositely charged homogeneously decorated and Janus particles based on electrostatic interactions mediated by polyelectrolytes grafted onto their surface. Two different assembly routes are proposed depending on the target structures: raspberry-like/half-raspberry-like or dumbbell-like micro-clusters. Ultimately, stable symmetric and asymmetric micro-structures could be obtained in a well-controlled manner for the homogeneous–homogeneous and homogeneous–Janus particle assemblies, respectively. The spatially separated functionalities of the asymmetric Janus particle-based micro-clusters allow their further assembly into complex hierarchical constructs, which may potentially lead to the design of materials with tailored plasmonics and optical properties.

scholarly journals Biofunctional Janus particles promote phagocytosis of tumor cells by macrophages

2020 ◽  
Vol 11 (20) ◽  
pp. 5323-5327
Author(s):  
Ya-Ru Zhang ◽  
Jia-Qi Luo ◽  
Jia-Xian Li ◽  
Qiu-Yue Huang ◽  
Xiao-Xiao Shi ◽  
...  
Keyword(s):  
Tumor Cell ◽  
Cancer Immunotherapy ◽  
Tumor Cells ◽  
Janus Particles ◽  
Janus Particle

A versatile Janus particle platform modified with biological ligands can facilitate tumor cell phagocytosis by macrophages for promising cancer immunotherapy.

Induced-charge electrophoresis of uncharged dielectric spherical Janus particles

2012 ◽  
Vol 33 (5) ◽  
pp. 870-879 ◽  
Author(s):  
Alicia M. Boymelgreen ◽  
Touvia Miloh
Keyword(s):  
Janus Particles ◽  
Induced Charge

Janus particle synthesis via aligned non-concentric angular nozzles and electrohydrodynamic co-flow for tunable drug release

RSC Advances ◽  
2016 ◽  
Vol 6 (81) ◽  
pp. 77174-77178 ◽  
Author(s):  
Chunchen Zhang ◽  
Ming-Wei Chang ◽  
Yudong Li ◽  
Yuankai Qi ◽  
Jingwen Wu ◽  
...  
Keyword(s):  
Drug Release ◽  
Processing Parameters ◽  
Janus Particles ◽  
Particle Structure ◽  
Janus Particle ◽  
Particle Synthesis ◽  
Tilted Angle ◽  
Dual Drug

A novel non-concentric tilted angle nozzle was designed and manufactured to enable the synthesis of tunable Janus particles. The effect of processing parameters and device configurations on particle structure and dual drug release were explored.

scholarly journals Inferring non-equilibrium interactions from tracer response near confined active Janus particles

2021 ◽  
Vol 7 (18) ◽  
pp. eabd0719
Author(s):  
Jaideep Katuri ◽  
William E. Uspal ◽  
Mihail N. Popescu ◽  
Samuel Sánchez
Keyword(s):  
Symmetry Axis ◽  
Coarse Grained ◽  
Janus Particles ◽  
Janus Particle ◽  
Indirect Methods ◽  
Effective Interactions ◽  
Coarse Grained Model ◽  
Direct Mapping ◽  
Tracer Particles ◽  
Non Equilibrium

Chemically active Janus particles sustain non-equilibrium spatial variations in the chemical composition of the suspending solution; these induce hydrodynamic flow and (self-)motility of the particles. Direct mapping of these fields has so far proven to be too challenging. Therefore, indirect methods are needed, e.g., deconvolving the response of “tracer” particles to the activity-induced fields. Here, we study experimentally the response of silica particles, sedimented at a wall, to active Pt/silica Janus particles. The latter are either immobilized at the wall, with the symmetry axis perpendicular or parallel to the wall, or motile. The experiments reveal complex effective interactions that are dependent on the configuration and on the state of motion of the active particle. Within the framework of a coarse-grained model, the behavior of tracers near an immobilized Janus particle can be captured qualitatively once activity-induced osmotic flows on the wall are considered.

Wall effects on self-diffusiophoretic Janus particles: a theoretical study

2013 ◽  
Vol 735 ◽  
pp. 473-498 ◽  
Author(s):  
Darren G. Crowdy
Keyword(s):  
Theoretical Study ◽  
Nonlinear Dynamical System ◽  
Janus Particles ◽  
Boundary Slip ◽  
Concentration Gradients ◽  
Janus Particle ◽  
Nonlinear Dynamical ◽  
Piecewise Constant ◽  
Surface Activities ◽  
Surrounding Fluid

AbstractWe present a theoretical investigation of the self-diffusiophoresis of a class of two-faced, two-dimensional Janus particles propelled by the production of gradients in the concentration of a solute diffusing into a surrounding fluid at zero Reynolds and Péclet numbers. Those concentration gradients produce a tangential boundary slip resulting in translation and rotation of the particle, as a consequence of the fact that it is free of both force and torque. The model Janus particles studied here have piecewise constant surface mobilities and surface activities over two faces. An isolated circular Janus particle is studied first and its speed of locomotion in free space is found analytically. Confinement effects are then investigated by placing such a Janus particle near a straight no-slip wall. The governing nonlinear dynamical system is found in explicit form. It is used to study how the geometry, location and orientation of the particle relative to the wall affect its motion. It is found that if the particles do not hit the wall in finite time they are eventually repelled away from it.

scholarly journals Frequency Response of Induced-Charge Electrophoretic Metallic Janus Particles

Micromachines ◽  
2020 ◽  
Vol 11 (3) ◽  
pp. 334 ◽  
Author(s):  
Chong Shen ◽  
Zhiyu Jiang ◽  
Lanfang Li ◽  
James F. Gilchrist ◽  
H. Daniel Ou-Yang
Keyword(s):  
Electric Field ◽  
Drag Coefficient ◽  
Janus Particles ◽  
Crossover Frequency ◽  
Electric And Magnetic Fields ◽  
Linear Movement ◽  
Phase Sensitive ◽  
Induced Charge ◽  
And Control ◽  
Phoretic Mobility

The ability to manipulate and control active microparticles is essential for designing microrobots for applications. This paper describes the use of electric and magnetic fields to control the direction and speed of induced-charge electrophoresis (ICEP) driven metallic Janus microrobots. A direct current (DC) magnetic field applied in the direction perpendicular to the electric field maintains the linear movement of particles in a 2D plane. Phoretic force spectroscopy (PFS), a phase-sensitive detection method to detect the motions of phoretic particles, is used to characterize the frequency-dependent phoretic mobility and drag coefficient of the phoretic force. When the electric field is scanned over a frequency range of 1 kHz–1 MHz, the Janus particles exhibit an ICEP direction reversal at a crossover frequency at ~30 kH., Below this crossover frequency, the particle moves in a direction towards the dielectric side of the particle, and above this frequency, the particle moves towards the metallic side. The ICEP phoretic drag coefficient measured by PFS is found to be similar to that of the Stokes drag. Further investigation is required to study microscopic interpretations of the frequency at which ICEP mobility switched signs and the reason why the magnitudes of the forward and reversed modes of ICEP are so different.

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