By Dongqing Li
A lab-on-a-chip equipment is a microscale laboratory on a credit-card sized glass or plastic chip with a community of microchannels, electrodes, sensors and digital circuits.These labs on a chip can replica the really good features as played through their room-sized opposite numbers, comparable to scientific diagnoses, PCR and electrophoretic separation. some great benefits of those labs on a chip comprise major relief within the quantities of samples and reagents, very brief response and research time, excessive throughput and portability.Generally, a lab-on-a-chip gadget needs to practice a couple of microfluidic capabilities: pumping, blending, thermal cycling/incubating, shelling out, and keeping apart. detailed manipulation of those microfluidic strategies is vital to the operation and function of labs on a chip.The goal of this booklet is to supply a basic realizing of the interfacial electrokinetic phenomena in numerous key microfluidic techniques, and to teach how those phenomena might be utilised to manage the microfluidic tactics. For this goal, this e-book emphasises the theoretical modelling and the numerical simulation of those electrokinetic phenomena in microfluidics. notwithstanding, experimental reviews of the electrokinetic microfluidic procedures also are highlighted in enough aspect. * the 1st booklet which systematically stories electrokinetic microfluidics tactics for lab-on-a chip functions* Covers modelling and numerical simulation of the electrokinetic microfluidics strategies* supplying details on experimental stories and info of experimental recommendations, that are crucial if you happen to are new to this box
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Additional info for Electrokinetics in Microfluidics
Y/<25mV). In the cases of large surface potentials, it has been found that, in comparison with the exact solution of the Poisson-Boltzmann equation, the linear solution predicts slightly lower values of the potential in the region near the wall. After a small distance from the wall, the difference between the linear solution and the exact solution diminishes. Discussions of the difference between these two solutions can be found elsewhere [1,3,4]. 2. , the streaming potential). The equation of motion is the Z-directional momentum Equation.
These moving ions drag the surrounding liquid molecules with them. This generates an opposite flow to the pressure-driven flow and hence a reduced flow rate in the pressuredrop direction. (27), this reduced flow rate seems to suggest that the liquid have a higher viscosity. 5. Variation of the ratio of apparent viscosity to the bulk viscosity with the electrokinetic separation distance Kat £= -50 mV. 5. 75 when K = 2, and then decreases as K increases, approaching a constant value equal to one for very large values of K.
This current is called the streaming current. Corresponding to this streaming current, there is an electrokinetic potential called the streaming potential. This flow induced streaming potential is a potential difference that builds up along a microchannel. , opposite to the pressuredriven flow direction. 1. It is obvious that when ions move in a liquid, they will pull the liquid molecules to move with them. Therefore, the conduction current will produce a liquid flow in the opposite direction to the pressure driven flow.
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