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Introduction of Pressure Sensor Chip

For different application purposes, microfluidic devices have been widely studied in recent years. As the most important parameter in microfluidic systems, pressure plays a good role in the flow pattern formation inside the channel. In general, the easiest way for pressure measurement is using gauges. However, the gauges cannot be used in microfluidic chips. In this case, the pressure of these chips can be measured with the help of a membrane and sensing channel. The technology relies on pressure-induced deformation of the elastic membrane and then the pressure can be determined from the change in capacitance at the gap caused.

For pressure sensing purposes, the novel polyimide (PI) carbon nanotube composites were fabricated by in situ polymerization using multi-wall carbon nanotubes (MWNT) as fillers. It was found that the electrical resistivity of this composite varies significantly with both the temperature and the stress in the material. In conclusion, the pressure sensor chips got great attention and have widely be used in multiple applications, such as cell culture, fluid mixing, and droplet manipulation.

Fig. 1 Microfluidic pressure sensing.¹

Development of On-chip Micro Pressure Sensor

In the previous study, scientists have developed a novel on-chip micro pressure sensor for microfluidic pressure monitoring. The polydimethylsiloxane (PDMS) microfluidic device mainly contains a working fluid channel and a sealed detection channel beneath it. The volume of the detection channel would change with any pressure changes in the working fluid channel. In the detection channel, there is a mixture of two immiscible fluids sealed and the pressure of the working fluid can be monitored easily by measuring the interface displacement of these two fluids. Between the working channel and detection channel, the PDMS film can avoid cross-contamination between fluids. In addition, two pressure sensors can be integrated into a microchip to characterize the pressure drop in the microchannel.

Fig. 2 Schematic of microfluidic pressure sensor devices.²

Advantages of Pressure Sensor Chip

• Relatively low cost
• Simple fabrication process
• Can be repeatedly used with direct current readout
• Great linearity
• Fast response and time stability

Creative Biolabs offers a suite of custom microfluidic chips development services to address the ever-changing research of microfluidic devices. Equipped with years of experience and advanced platforms, we can offer one-stop microfluidic solutions to meet the special needs of our clients. If you are interested in our services, please do not hesitate to contact us for more detailed information.

References

1. Islam, Doria, et al. " Piezoresistive Conductive Microfluidic Membranes for Low-Cost On-Chip Pressure and Flow Sensing." Sensors 22.4 (2022): 1489.
2. Jung, Yang, et al. " Highly Stable Liquid Metal-Based Pressure Sensor Integrated with a Microfluidic Channel." Sensors 15.5 (2015): 11823-11835.

For Research Use Only. Not For Clinical Use.