Numerical analysis of nanoparticle behavior in a microfluidic channel under dielectrophoresis

Neculae, Adrian; Biris, Claudiu G.; Bunoiu, Mădălin; Lungu, Mihai

doi:10.1007/s11051-012-1154-4

Cited by 17 publications

(31 citation statements)

References 16 publications

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“…This simple geometry was chosen in order to allow, for electrodes with length much larger than the height, the comparison with the results obtained for the 2D geometry of the separation device. The obtained results were successfully compared to other similar results already published [4,10] for the validation of the program. After this validation procedure, the computations can be easily extended to more complex and realistic configurations.…”

Section: 45mentioning

confidence: 73%

“…The complex permittivity is / j , where represents the electric permittivity and the conductivity of the dielectric. After some mathematical manipulations, it can be shown that the dielectrophoretic force (1) comprises two independent contributions, called the DEP and twDEP (traveling wave) components of the force, respectively, which can be expressed as [4,5]:…”

Section: Mathematical Modelmentioning

confidence: 99%

“…All the numerical simulations were performed using the finite element software COMSOL Multiphysics. For mathematical simplicity and computational efficiency, a non-dimensional method is employed: the electric potential was scaled with the amplitude of the applied signal, V 0 , the distances were scaled with the electrode width, d, while for the time, velocity and particle volume fraction we used the scales of 2 / , / d D D d and 0 (the initial average volume fraction), respectively, In order to calculate the dieletrophoretic forces, one must evaluate the strength of the electric field; first we solved the Laplace's equations for the real and imaginary components of the potential, together with the associated boundary conditions [4]. Due to the symmetry and periodicity, the calculations were performed on a computational domain representing only a small region of the separation device, containing four electrodes with 30μm d l and 3μm w , dimensions which are typical for the equipments used in dielectrophoretic manipulation.…”

Section: 45mentioning

confidence: 99%

“…The sources of polluting emissions are generally equipped with different filters that capture only micron particles, while all the nanoparticles escape in the air. All the traditional methods attempted for manipulating (retaining and separating) nanoparticles from gas suspensions have not been efficient (because only a small part of the particles is collected and only when they attach to larger particles) [3,4].…”

Section: Introductionmentioning

confidence: 99%

“…For different values of these parameters, the DEP force can be positive or negative. Positive DEP force attracts particles in regions with strong electric field gradients, while negative DEP force repels them from these regions [4][5][6]. This specific behavior gives rise to the potential applications of DEP in handling and separation of a large variety of nanometric particles.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Study of a 3D DEP-based microfluidic system for selective nanoparticle manipulation

Lungu¹,

Balasiu²,

Bunoiu³

et al. 2014

AIP Conference Proceedings

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Reductive surface synthesis of gold nanoparticles on silicate glass and their biochemical sensor applications Biomicrofluidics 6, 044111 (2012); 10.1063/1.4769780One-step fabrication of 3D silver paste electrodes into microfluidic devices for enhanced droplet-based cell sorting AIP Advances 5, 057134 (2015) Abstract. Manipulation of nanoparticle using dielectrophoresis (DEP) is an emerging technique to separate particles solely according to their dielectric properties and size, used in different forms to control the position, their orientation and velocity, to filtrate chemical compounds contained in the gas resulting from combustion processes, etc. This contribution presents the results of a simulation study which aims to characterize the functionality of a 3D DEP-based microsystem for the selective manipulation of nanometric particles. The use of 3D geometry of the device represents an important improvement in the description of the behavior of a nanoparticle suspension subjected to dielectrophoretic forces. The numerical solutions of the electric potential, electric field, DEP force and particle concentration distribution for a typical interdigitated electrodes array are calculated using the COMSOL Multiphysics finite element solver. The presented results demonstrate that dielectrophoresis can be successfully used for the manipulation of nanometric particles and give important information for the optimization of the experimental setup.

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Section: 45mentioning

confidence: 73%

Section: Mathematical Modelmentioning

confidence: 99%

Section: 45mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Study of a 3D DEP-based microfluidic system for selective nanoparticle manipulation

Lungu¹,

Balasiu²,

Bunoiu³

et al. 2014

AIP Conference Proceedings

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Dielectrophoresis Used for Nanoparticle Manipulation in Microfluidic Devices

Lungu

Bunoiu

Neculae

2014

Nanoparticles' Promises and Risks

Self Cite

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Nano-sized particles have received considerable interest in the past two decades. The filtration of nanoparticles is becoming an important issue as they are produced in large numbers from material synthesis or combustion emission, and their effect on human health is relatively high. Dielectrophoresis (DEP), phenomenon that induces spatial movement of particles placed in nonuniform electric field, depending on the dielectric properties of the particles and the surrounding medium, the geometry of the electrodes, and the amplitude and frequency of the applied signal, proved to be the most adequate tool in order to manipulate particles at submicron scale. First, this work presents an overview of the various applications of the dielectrophoresis. Next, the theoretical description of the main forces implied in the spatial control of submicron particles is given. Finally, a mathematical model describing the filtration of nanoparticles suspended in flue gas by a combination of dielectrophoretic and electrohydrodynamic forces, and a set of numerical results obtained by simulations performed in the frame of this model are presented. The dielectrophoretic force and the nanoparticles concentration profile in a DEP-based separation micro system consisting of a micro channel are numerically investigated using the COMSOL Multiphysics finite element code. The performances of the filtration device are analyzed in terms of a specific quantity related to the separation process, called Filtration rate. The simulations provide the optimal set of values for the control parameters of the separation process in order to obtain a desired performance, and represent a useful tool in designing of microfluidic devices for separating nanoparticles from flue gas.

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Nanoparticles influence droplet formation in a T-shaped microfluidic

Wang

2013

J Nanopart Res

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Droplet formation in the presence of nanoparticles was studied in a T-shaped microfluidic device numerically. Nanoparticles in continuous phase did not influence droplet formation dynamics obviously. Contrarily, the presence of nanoparticles in dispersed phase will influence evidently droplet formation dynamics, likely reasons are the accumulation of nanoparticles at the liquid–liquid interface leading to the variation of interfacial tension and the anisotropy of nanoparticles’ movement at interface. The droplet size decreases almost linearly with increasing of the volume fraction of nanoparticles in dispersed phase when the volume fraction of nanoparticles not exceeding a critical value (about 0.2 %), because very high concentration of nanoparticles results in particle aggregation so as to not decrease interfacial tension so obviously any more. A complicated mechanism of temperature influences on droplet formation may exist combining the variations of effective viscosity and interfacial tension. Discussions on microscopic mechanism of droplet formation in the presence of nanoparticles were carried out.

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Numerical analysis of nanoparticle behavior in a microfluidic channel under dielectrophoresis

Cited by 17 publications

References 16 publications

Study of a 3D DEP-based microfluidic system for selective nanoparticle manipulation

Study of a 3D DEP-based microfluidic system for selective nanoparticle manipulation

Dielectrophoresis Used for Nanoparticle Manipulation in Microfluidic Devices

Nanoparticles influence droplet formation in a T-shaped microfluidic

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