Comprehensive analysis of alternating current electrokinetics induced motion of colloidal particles in a three-dimensional microfluidic chip

2013 ◽  
Vol 113 (19) ◽  
pp. 194702 ◽  
Author(s):  
Thibault Honegger ◽  
David Peyrade
Keyword(s):  
Microfluidic Chip ◽  
Colloidal Particles ◽  
Three Dimensional ◽  
Alternating Current ◽  
Comprehensive Analysis ◽  
Induced Motion

scholarly journals Fast Overlap Detection between Hard-Core Colloidal Cuboids and Spheres. The OCSI Algorithm

Algorithms ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 72
Author(s):  
Luca Tonti ◽  
Alessandro Patti
Keyword(s):  
Colloidal Particles ◽  
Dynamic Properties ◽  
Wide Spectrum ◽  
Three Dimensional ◽  
Hard Core ◽  
Detection Algorithm ◽  
Three Dimensional Objects ◽  
Aggregation Behaviour ◽  
Sphere Radius ◽  
User Friendly

Collision between rigid three-dimensional objects is a very common modelling problem in a wide spectrum of scientific disciplines, including Computer Science and Physics. It spans from realistic animation of polyhedral shapes for computer vision to the description of thermodynamic and dynamic properties in simple and complex fluids. For instance, colloidal particles of especially exotic shapes are commonly modelled as hard-core objects, whose collision test is key to correctly determine their phase and aggregation behaviour. In this work, we propose the Oriented Cuboid Sphere Intersection (OCSI) algorithm to detect collisions between prolate or oblate cuboids and spheres. We investigate OCSI’s performance by bench-marking it against a number of algorithms commonly employed in computer graphics and colloidal science: Quick Rejection First (QRI), Quick Rejection Intertwined (QRF) and a vectorized version of the OBB-sphere collision detection algorithm that explicitly uses SIMD Streaming Extension (SSE) intrinsics, here referred to as SSE-intr. We observed that QRI and QRF significantly depend on the specific cuboid anisotropy and sphere radius, while SSE-intr and OCSI maintain their speed independently of the objects’ geometry. While OCSI and SSE-intr, both based on SIMD parallelization, show excellent and very similar performance, the former provides a more accessible coding and user-friendly implementation as it exploits OpenMP directives for automatic vectorization.

Possibilities of modern visualisation of helminthic chorioretinitis

Reflection ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 12-17
Author(s):  
E.V. Arkhipov ◽  
◽  
S.I. Zhukova ◽  
N.V. Zaitseva ◽  
◽  
...  
Keyword(s):  
Optical Coherence Tomography ◽  
Visual Acuity ◽  
Clinical Case ◽  
Clinical Laboratory ◽  
Three Dimensional ◽  
Comprehensive Analysis ◽  
Oct Angiography ◽  
Standard Analysis ◽  
Complex Reconstruction ◽  
Paracentral Scotoma

Purpose. To present a rare clinical case of helminthic chorioretinitis in a child and to demonstrate the informative value of a comprehensive analysis of optical coherence tomography (OCT) in identifying the etiological nature of the disease. Methods. The results of clinical, laboratory and instrumental examination of a patient with chorioretinitis caused by ascaris. Results. After etiotropic therapy, the patient had an increase of visual acuity from 0.8 to 1.0 and a two-fold decrease of paracentral scotoma. Conclusion. The presented case shows high informative value of combination of standard analysis of retinal maps and sagittal scans with the complex reconstruction of three-dimensional image and analysis of frontal scans obtained in OCT-angiography (OCTA) mode. Key words: chorioretinitis; helminthiasis; OCT-angiography.

Influence of Cl/Br substitution on the stereochemical peculiarities of copper(I) π-complexes with the 1-allyl-2-aminopyridinium cation

2003 ◽  
Vol 59 (11) ◽  
pp. m478-m481 ◽  
Author(s):  
Evgeny Goreshnik ◽  
Dieter Schollmeier ◽  
Marian Mys'kiv
Keyword(s):  
Hydrogen Bonds ◽  
Electrochemical Synthesis ◽  
Three Dimensional ◽  
Alternating Current ◽  
Dimensional Structure ◽  
Three Dimensional Structure

By using alternating-current electrochemical synthesis, crystals of the CuI π-complexes bis(1-allyl-2-aminopyridinium) di-μ-chloro-bis[chlorocopper(I)], (C8H11N2)2[Cu2Cl4] or [H2NC5H4NC3H5][CuCl2], and bis(1-allyl-2-aminopyridinium) di-μ-(chloro/bromo)-bis[(chloro/bromo)copper(I)], (C8H11N2)2[Cu2Br2.2Cl1.8] or [H2NC5H4NC3H5][CuBr1.10Cl0.90], have been obtained and structurally investigated. In each of the isostructural (isomorphous) compounds, the distorted tetrahedral Cu environment involves three halide atoms and the C=C bond of the ligand. Both compounds reside on inversion centres, and the dimeric [Cu2 X 4·2H2NC5H4NC3H5] units are bonded into a three-dimensional structure by N—H...X hydrogen bonds. The Br content in the terminal X1 position is much higher than that in the bridged X2 site.

Towards New Methodologies for Manipulation of Colloidal Particles in a Miniaturized Fluidic Device: Optoelectrokinetic Manipulation Technique

2013 ◽  
Vol 135 (2) ◽  
Author(s):  
Jae-Sung Kwon ◽  
Steven T. Wereley
Keyword(s):  
Microfluidic Chip ◽  
Colloidal Particles ◽  
Future Prospects ◽  
Simultaneous Application ◽  
Laser Illumination ◽  
Research Fields ◽  
Ac Electric Field ◽  
Fluidic Device ◽  
New Methodologies ◽  
Rapid Electrokinetic Patterning

The rapid electrokinetic patterning (REP) technique developed recently is a hybrid optoelectrokinetic one that manipulates micro- or nanocolloids in a microfluidic chip using the simultaneous application of a uniform ac electric field and laser illumination. Since its invention, the technique has been applied to many research fields with promising potential, but these applications are still in their early stages. In order to effectively complete and leverage the applications, this paper reviews the publications concerning the REP technique and discusses its underlying principles, applications, and future prospects.

Three-Dimensional Simulation of Cross-Flow Microfilter Fouling in Tortuous Pore Profiles With Semisynthetic Metalworking Fluids

2012 ◽  
Vol 134 (6) ◽  
Author(s):  
Bingyi Yu ◽  
Shiv G. Kapoor ◽  
Richard E. DeVor
Keyword(s):  
Colloidal Particles ◽  
Three Dimensional ◽  
Particle Trapping ◽  
Collision Model ◽  
Flux Decline ◽  
Cake Layer ◽  
Trapping Model ◽  
Wall Collision ◽  
Dimensional Simulation ◽  
Layer Development

Fouling mechanisms and models for flux decline are investigated with a three-dimensional simulation of the tortuous, verisimilar geometry of an α-alumina microfilter. Reconstruction of the three-dimensional geometry was accomplished from two-dimensional cross-sectional cuts. A wall collision model and a particle trapping model are developed for the investigation of fouling mechanisms. The reconstructed geometry and the two models were used in computational fluid dynamics to simulate metalworking colloidal particles travelling through and becoming trapped in the tortuous pore paths of a microfilter. Results reveal sharp flux decline initiating from partial pore blocking and subdued flux decline transitioning to cake layer development with steady-state flow. This flow behavior is in agreement with experimental data from earlier studies. The inclusion of the wall collision model and particle trapping model enabled the revelation of cake layer development as a fouling mechanism. Additional simulations of microfilters at different particle size distributions were conducted and discussed.

Dielectrophoretic Mixing With Novel Electrode Geometry

2009 ◽  
Author(s):  
G. Naga Siva Kumar ◽  
Sushanta K. Mitra ◽  
Subir Bhattacharjee
Keyword(s):  
Electric Field ◽  
Cell Activation ◽  
Colloidal Particles ◽  
Colloidal Suspension ◽  
Three Dimensional ◽  
Colloidal Suspensions ◽  
Navier Stokes ◽  
Mixing Efficiency ◽  
Computational Domain ◽  
Element Analysis

Electrokinetic mixing of analytes at micro-scale is important in several biochemical applications like cell activation, DNA hybridization, protein folding, immunoassays and enzyme reactions. This paper deals with the modeling and numerical simulation of micromixing of two different types of colloidal suspensions based on principle of dielectrophoresis (DEP). A mathematical model is developed based on Laplace, Navier-Stokes, and convection-diffusion-migration equations to calculate electric field, velocity, and concentration distributions, respectively. Mixing of two colloidal suspensions is simulated in a three-dimensional computational domain using finite element analysis considering dielectrophoretic, gravitational and convective (advective)–diffusive forces. Phase shifted AC signal is applied to the alternating electrodes for achieving the mixing of two different colloidal suspensions. The results indicate that the electric field and DEP forces are maximum at the edges of the electrodes and become minimum elsewhere. As compared to curved edges, straight edges of electrodes have lower electric field and DEP forces. The results also indicate that DEP force decays exponentially along the height of the channel. The effect of DEP forces on the concentration profile is studied. It is observed that, the concentration of colloidal particles at the electrodes edges is very less compared to elsewhere. Mixing of two colloidal suspensions due to diffusion is observed at the interface of the two suspensions. The improvement in mixing after applying the repulsive DEP forces on the colloidal suspension is observed. Most of the mixing takes place across the slant edges of the triangular electrodes. The effect of electrode pairs and the mixing length on degree of mixing efficiency are also observed.

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