Development of droplet microfluidic system and regime of biomineralization

ZHANG Jinxuan; LIU Hanlong; XIAO Yang

doi:10.11779/CJGE20230255

Volume 46 Issue 6

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Chinese Journal of Geotechnical Engineering > 2024 > 46(6): 1236-1245. > DOI: 10.11779/CJGE20230255

ZHANG Jinxuan, LIU Hanlong, XIAO Yang. Development of droplet microfluidic system and regime of biomineralization[J]. Chinese Journal of Geotechnical Engineering, 2024, 46(6): 1236-1245. DOI: 10.11779/CJGE20230255

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Development of droplet microfluidic system and regime of biomineralization

School of Civil Engineering, Chongqing University, Chongqing 400045, China

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Received Date: March 23, 2023
Available Online: June 05, 2023

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Abstract

Abstract

The microbially induced calcium carbonate precipitation (MICP) is a novel technique for soil reinforcement based on biomineralization. The MICP regime has not been fully explored due to the complexity of biomineralization process with so many factors affecting nucleation and growth of minerals. Recently, biomineralization evolution can be visually observed at microscale by using the microfluidic system, whereas the magnification for observation of crystal growth is still limited. In this study, a droplet microfluidic chip is designed to generate oblate droplet cells with 450μm in diameter by adjusting the flow velocities of two immiscible liquids, which can be used for MICP microreactor, i.e., the droplet microfluidic system for biomineralization with high precision. With the help of the system, it is found that the distribution of bacteria around CaCO₃ crystals is almost unchanged with the CaCO₃ crystals growing proportionally, and the crystal morphology remains the same. Some bacterial cells nearby the crystal are adsorbed on the crystal surface during the crystal growth with no obvious bacterial aggregation around the crystal. In addition, with the help of SEM, some caves on the crystal surface are found to be the sites that bacterial cells are adsorbed. Consequently, the droplet microfluidic system can provide a precise microreactor for biomineralization and an effective method for exploring nucleation regimes in MICP.
- droplet microfluidics,
- microfluidic chip,
- MICP,
- calcium carbonate,
- biomineralization

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