A theoretical study of induced-charge dipolophoresis of ideally polarizable asymmetrically slipping Janus particles

2011 ◽  
Vol 23 (7) ◽  
pp. 072007 ◽  
Author(s):  
Alicia M. Boymelgreen ◽  
Touvia Miloh
Keyword(s):  
Theoretical Study ◽  
Janus Particles ◽  
Induced Charge

Proton-induced collision dynamics on potential prebiotic sulfur species

2018 ◽  
Vol 20 (14) ◽  
pp. 9084-9089 ◽  
Author(s):  
Marie-Christine Bacchus-Montabonel
Keyword(s):  
Charge Transfer ◽  
Ab Initio ◽  
Theoretical Study ◽  
Collision Dynamics ◽  
Sulfur Species ◽  
Hcn Oligomers ◽  
Induced Charge

The role of sulfur in proton-induced charge transfer is analyzed through an ab initio theoretical study of mercaptoacetonitrile HSCH2CN with related HCN oligomers.

Experimental and Theoretical Study of Alpha Particle Induced Charge Collection in GaAs FETS

1987 ◽  
Vol 34 (6) ◽  
pp. 1326-1331 ◽  
Author(s):  
W. T. Anderson ◽  
A. R. Knudson ◽  
F. A. Buot ◽  
H. L. Grubin ◽  
J. P. Kreskovsky ◽  
...  
Keyword(s):  
Alpha Particle ◽  
Theoretical Study ◽  
Charge Collection ◽  
Induced Charge

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

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.

scholarly journals Multiple phoretic mechanisms in the self-propulsion of a Pt-insulator Janus swimmer

2017 ◽  
Vol 828 ◽  
pp. 318-352 ◽  
Author(s):  
Yahaya Ibrahim ◽  
Ramin Golestanian ◽  
Tanniemola B. Liverpool
Keyword(s):  
Coating Thickness ◽  
Theoretical Study ◽  
Reaction Rates ◽  
The Self ◽  
Janus Particles ◽  
Potential Significance

We present a detailed theoretical study which demonstrates that electrokinetic effects can also play a role in the motion of metallic-insulator spherical Janus particles. Essential to our analysis is the identification of the fact that the reaction rates depend on Pt-coating thickness and that the thickness of coating varies from pole to equator of the coated hemisphere. We find that their motion is due to a combination of neutral and ionic-diffusiophoretic as well as electrophoretic effects whose interplay can be changed by varying the ionic properties of the fluid. This has great potential significance for optimizing performance of designed synthetic swimmers.

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.

Anions [N(CH2)3]− and [ON(CH2)2]− are Stable in the Gas Phase, but Can They Be Charge Stripped to Form the Radicals N(CH2)3 and ON(CH2)2? A Joint Experimental and Theoretical Study

2009 ◽  
Vol 15 (2) ◽  
pp. 91-104 ◽  
Author(s):  
Mark Fitzgerald ◽  
Suresh Dua ◽  
Daniel Bilusich ◽  
Peter C.H. Eichinger ◽  
Salvatore Peppe ◽  
...  
Keyword(s):  
Gas Phase ◽  
Ring Opening ◽  
Collisional Activation ◽  
Theoretical Study ◽  
Induced Charge ◽  
Minor Losses ◽  
Ring Open

Collision-induced activation of deprotonated trimethylamine N-oxide yields the two anions [N(CH2)3]– and [ON(CH2)2]– following losses of H2O and CH4, respectively. These two anions decompose by minor losses of H• and H2 when collisionally activated: no other fragmentations are noted. Calculations at the CCSD(T)/aug-cc-pVDZ//B3LYP/6-31+G(d) level of theory indicate that these trigonal anions are stable, and should not rearrange following collisional activation. Collisional-induced charge stripping of the anions [N(CH2)3]– and [ON(CH2)2]–, respectively, form N(CH2)3 and ON(CH2)2. Some of these neutrals are energised and undergo rearrangement and dissociation. From a consideration of experiment and theory, it is proposed (i) that energised N(CH2)3 may cyclise to form the 1-aziridinylcarbinyl radical. This species may ring open to CH2=NCH2CH2 which then decomposes to CH2N and C2H4 and (ii) energised ON(CH2)2 may undergo OC cyclisation followed by ring opening to energised CH2=NCH2O which may fragment to yield CH2N and CH2O.

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