Enhancing active electro-kinetic micro-mixer efficiency by introducing vertical electrodes and modifying chamber aspect ratio

Bagherabadi, Kamyar Maleki; Sani, Mahdi; Saidi, Mohammad R.

doi:10.1016/j.cep.2019.107560

Cited by 9 publications

(3 citation statements)

References 46 publications

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“…Micromixers can be divided into active and passive ones according to whether there is a power source or not [8][9][10]. Active micromixers typically use external energy fields such as electrode-driven [11], magnetic-driven [11], acoustic-driven [12], while the mixing mechanism of passive mixers is based on molecular diffusion and chaotic advection of fluids, so passive micromixers are more economical. Researchers have been committed to study obstacles and channel forms of various shapes to increase the contact surface between fluids and reduce the mixing path.…”

Section: Introductionmentioning

confidence: 99%

An embedded obstacle type micromixer‐concentration gradient generator based on capillary driven

Huang,

Wu,

Wang

et al. 2023

Electrophoresis

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An embedded obstacle‐type micromixer‐concentration gradient generator based on capillary self‐driven is proposed and studied. Herringbone structure (HS) for mixing and palisade‐shape small channels at the outlet are designed in the device (named HS). Simulation and experimentation are done to study the liquid mixing efficiency in the small channels and concentration gradient at the outlet, and the experimental results agree with the simulation results. For three cases of liquid dripping (sequential, reverse, and delayed drippings), mixing analysis shows that the mixing efficiency increases along both mixing channel and palisade length, and is high in the middle small channel of the palisade‐shape area and low on both sides. An obvious concentration gradient at the outlet can form compared with the device without the palisade‐shape area. Finally, water pH value detection is done as one of the applications of HS. This study can provide guidance for the application of HS in biochemical detection, cell research, drug screening, etc. based on the capillary‐driven effect.

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Section: Introductionmentioning

confidence: 99%

An embedded obstacle type micromixer‐concentration gradient generator based on capillary driven

Huang,

Wu,

Wang

et al. 2023

Electrophoresis

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“…Bagherabadi et al 23 studied mixing efficiency using electrokinetic instability by incorporating electrodes into a microchannel. They found that the applied vertical electrodes on the microchannel wall generated chaotic advection, leading to enhancing mixing.…”

Section: Introductionmentioning

confidence: 99%

Analysis and optimization of heterogeneously charged surface features in electrokinetic micromixing of non-Newtonian fluids

Kumar Bansal,

Dayal,

Kumar

2023

Proceedings of the Institution of Mechanical Engineers, Part C:

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This study investigates the mixing of non-Newtonian fluids in microfluidic devices using electrokinetic phenomena Micromixing is a crucial operation that finds multiple applications in chemical research and biomedical diagnostics. In order to improve mixing, multiple combinations of heterogeneously charged triangular elements are considered for investigation. The power-law model was used to characterize the non-Newtonian behavior of fluids. The effect of different geometrical parameters (hurdle length, height, number, and shape) and electrical parameters (applied external electric field and zeta potential on hurdles) on mixing are evaluated. The results indicate that the element shape, number, and fluid viscosity significantly affect mixing in microchannels. Moreover, the homogeneity of the mixed fluids increases with the flow behavior index (n). We found that dilatant fluids mix relatively better than pseudoplastic fluids. Finally, the Taguchi technique used to evaluate the combined effect of all factors and obtained optimal mixing conditions for various flow behavior indices (n) of non-Newtonian fluids.

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“…In fields such as electronic-equipment manufacturing, biotechnology, and medicine, miniaturization and large-scale integration of systems are advancing, and process technology is being used to upgrade the functions of materials, substrates, and microdevices [ 1 , 2 , 3 , 4 , 5 , 6 ]. This development includes the demand for various structures with complex shapes, such as three-dimensional structures for realizing effective microregional chemical reactions, mixing, and analyses in various fields, including biological microelectromechanical systems (bioMEMSs) and micro total analysis systems (µTASs) [ 7 , 8 , 9 , 10 , 11 ]. Studies on the fabrication of simple 2.5-dimensional structures with metals have been conducted, by devising methods for laminating and tapering to achieve these structures.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Three-Dimensionally Deformable Metal Structures Using Precision Electroforming

et al. 2022

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It is difficult to fabricate three-dimensional structures using semiconductor-process technology, because it is based on two-dimensional layered structure fabrication and the etching of thin films. In this study, we fabricated metal structures that can be dynamically deformed from two-dimensional to three-dimensional shapes by combining patterning using photolithography with electroforming technology. First, a resist structure was formed on a Cu substrate. Then, using a Ni sulfamate electroforming bath, a Ni structure was formed by electroforming the fabricated resist structure. Finally, the resist structure was removed to release the Ni structure fabricated on the substrate, and electroforming was used to Au-plate the entire surface. Scanning-electron microscopy revealed that the structure presented a high aspect ratio (thickness/resist width = 3.5), and metal structures could be fabricated without defects across the entire surface, including a high aspect ratio. The metallic structures had an average film thickness of 12.9 µm with σ = 0.49 µm, hardness of 600 HV, and slit width of 7.9 µm with σ = 0.25 µm. This microfabrication enables the fabrication of metal structures that deform dynamically in response to hydrodynamic forces in liquid and can be applied to fields such as environmental science, agriculture, and medicine.

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Enhancing active electro-kinetic micro-mixer efficiency by introducing vertical electrodes and modifying chamber aspect ratio

Cited by 9 publications

References 46 publications

An embedded obstacle type micromixer‐concentration gradient generator based on capillary driven

An embedded obstacle type micromixer‐concentration gradient generator based on capillary driven

Analysis and optimization of heterogeneously charged surface features in electrokinetic micromixing of non-Newtonian fluids

Fabrication of Three-Dimensionally Deformable Metal Structures Using Precision Electroforming

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