Size dependent thermodynamics and kinetics in electric field mediated colloidal crystal assembly

Soft Matter ◽  
2013 ◽  
Vol 9 (38) ◽  
pp. 9208 ◽  
Author(s):  
Tara D. Edwards ◽  
Daniel J. Beltran-Villegas ◽  
Michael A. Bevan
Keyword(s):  
Electric Field ◽  
Colloidal Crystal ◽  
Size Dependent ◽  
Thermodynamics And Kinetics

Continuous Dielectrophoretic Separation of Multiple Particles in a Microfluidic Chip

2008 ◽  
Author(s):  
Christian Davidson ◽  
Junjie Zhu ◽  
Xiangchun Xuan
Keyword(s):  
Particle Size ◽  
Electric Field ◽  
Flow Separation ◽  
Microfluidic Chip ◽  
Continuous Flow ◽  
Uniform Electric Field ◽  
Dielectrophoretic Force ◽  
Size Dependent ◽  
Multiple Particles ◽  
Dc Dielectrophoresis

We successfully demonstrate that DC dielectrophoresis can be utilized to separate particles of three dissimilar sizes simultaneously in a microfluidic chip. This continuous-flow separation is attributed to the particle size dependent dielectrophoretic force that is generated by the non-uniform electric field around a single insulating hurdle on the channel sidewall.

Electric-Field-Assisted Convective Assembly of Colloidal Crystal Coatings

Langmuir ◽  
2010 ◽  
Vol 26 (12) ◽  
pp. 10380-10385 ◽  
Author(s):  
Jairus Kleinert ◽  
Sejong Kim ◽  
Orlin D. Velev
Keyword(s):  
Electric Field ◽  
Colloidal Crystal ◽  
Convective Assembly

Hook Formation of Electrically Driven DNA Collisions with Finite-Sized Obstacles

2003 ◽  
Vol 790 ◽  
Author(s):  
Greg C. Randall ◽  
Patrick S. Doyle
Keyword(s):  
Electric Field ◽  
Deborah Number ◽  
Local Electric Field ◽  
Electric Field Gradients ◽  
Size Dependent ◽  
Dna Molecule ◽  
Field Gradients ◽  
The Impact ◽  
Single Dna Molecule ◽  
Comprehensive Study

ABSTRACTWe present a comprehensive study of the hooking mechanism of a single DNA molecule in electrophoretic motion colliding with a single microfabricated obstacle. During a collision, DNA impacts an obstacle and deforms. The impact conditions dictate whether this collision results in a “roll-off” event or “hooking” event. Our objective is to better understand the physics of a collision. Specifically, we note that a finite-sized insulating obstacle induces local electric field gradients that can enhance the size-dependent hooking probability. We validate that the hooking mechanism is analogous to a polymer in a transient, non-homogeneous elongational field with a strength characterized by the Deborah number, De. We then show that hook formation increases with De for finite-sized obstacles in the regime De<40.

Bernoulli–Euler Dielectric Beam Model Based on Strain-Gradient Effect

2013 ◽  
Vol 80 (4) ◽  
Author(s):  
Xu Liang ◽  
Shuling Hu ◽  
Shengping Shen
Keyword(s):  
Electric Field ◽  
Strain Gradient ◽  
Gradient Elasticity ◽  
Beam Theory ◽  
Field Strain ◽  
Beam Model ◽  
Strain Gradient Elasticity ◽  
Cantilever Beams ◽  
Size Dependent ◽  
Classical Beam Theory

The theoretical investigation of the size dependent behavior of a Bernoulli–Euler dielectric nanobeam based on the strain gradient elasticity theory is presented in this paper. The variational principle is utilized to derive the governing equations and boundary conditions, in which the coupling between strain and electric field, strain gradient and electric field, and strain gradient and strain gradient are taken into account. Different from the classical beam theory, the size dependent behaviors of dielectric nanobeams can be described. The static bending problems of elastic, pure dielectric (nonpiezoelectric), and piezoelectric cantilever beams are solved to show the effects of the electric field-strain gradient coupling and the strain gradient elasticity. Comparisons between the classical beam theory and the strain gradient beam theory are given in this study. It is found that the beam deflection predicted by the strain gradient beam theory is smaller than that by the classical beam theory when the beam thickness is comparable to the internal length scale parameters and the external applied voltage obviously affects the deflection of the dielectric and piezoelectric nanobeam. The presented model is very useful for understanding the electromechanical coupling in nanoscale dielectric structures and is very helpful for designing devices based on cantilever beams.

scholarly journals Capacitive coupling increases the accuracy of cell-specific tumour ablation by electric fields

2019 ◽  
Author(s):  
Terje Wimberger ◽  
Verena K. Köhler ◽  
Eva K. Ehmoser ◽  
Klemens J. Wassermann
Keyword(s):  
Electric Field ◽  
Electric Fields ◽  
Cellular Response ◽  
Irreversible Electroporation ◽  
Capacitive Coupling ◽  
Specific Lysis ◽  
Size Dependent ◽  
High K ◽  
High K Dielectric ◽  
Mcf 7

AbstractIrreversible electroporation holds great potential for cell-specific lysis due to the size-dependent susceptibility of cells to externally imposed electric fields. Previous attempts at selective cell lysis lead to significant overlap between affected populations and struggle with inconsistent biological outcome. We propose that charge transfer at the electrode-liquid interface is responsible by inducing multifactorial effects originating from both the electric field and electrochemical reactions. A promising remedy is the coating of electrodes with a high-k dielectric layer. The resulting capacitive coupling restores the selective potential of electric field mediated lysis in a microfluidic setup. Initial experiments show the consistent depletion of erythrocytes from whole blood while leaving leukocytes intact. The same is true for the reproducible and selective depletion of Jurkat and MCF-7 cells in a mixture with leukocytes. Unexpectedly, the observed order of lysis cannot be correlated with cell size. This implies that the cellular response to capacitive coupling features a selective characteristic that is different from conventional lysis configurations.

Intelligent Gels

1999 ◽  
Vol 604 ◽  
Author(s):  
Yoshihito Osada ◽  
Jian Ping Gong ◽  
Tetsuharu Narita
Keyword(s):  
Electric Field ◽  
Shape Memory ◽  
Cationic Surfactant ◽  
Applied Electric Field ◽  
Molecular Assembly ◽  
Side Chain ◽  
Alkyl Side Chain ◽  
Thermodynamics And Kinetics ◽  
Kinetics Of ◽  
And Diffusion

AbstractWe reported an electro-driven chemomechanical hydrogel showing quick responses with worm-like motility. The principle of the motion is based on the molecular assembly reaction of cationic surfactant and negatively charged hydrogel. And direction of complexation accompanying gel contraction is controlled by changing the polarity of the applied electric field. Both thermodynamics and kinetics of surfactant binding and diffusion are investigated experimentally and theoretically. We also reported shape memory hydrogel by order-disorder transition of alkyl side chain, and some examples od friction of hydrogels showing that frictional behaviors of hydorgels do not conform to Amonton's law.

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