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Kinetic biomineralization through microfluidic chip tests |
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| Authors: | Xiao Yang He Xiang Wu Wei Stuedlein Armin W. Evans T. Matthew Chu Jian Liu Hanlong van Paassen Leon A. Wu Huanran |
| Affiliation: | 1.Key Laboratory of New Technology for Construction of Cities in Mountain Area, Chongqing University, Chongqing, 400045, China ;2.School of Civil Engineering, Chongqing University, Chongqing, 400045, China ;3.Institute of Geotechnical Engineering, University of Natural Resources and Life Sciences, Vienna, Austria ;4.School of Civil and Construction Engineering, Oregon State University, Corvallis, OR, 97331, USA ;5.School of Civil and Environmental Engineering, Nanyang Technological University, Singapore, 639798, Singapore ;6.Center for Bio-Mediated and Bio-Inspired Geotechnics, Arizona State University, Tempe, AZ, 85287-3005, USA ; |
| Abstract: | A homogeneous microfluidic chip was used to investigate the pore-scale characteristics during the process of microbially induced calcium carbonate precipitation (MICP). An image-processing scheme was developed to measure the projecting areas of the precipitated calcium carbonate. Calcium carbonate first precipitated on the bacterium side before spreading to the rest of the chip. The distribution of calcium carbonate was more uniform along the length of the microchip than along the width. Raman back-scattering spectroscopy was used to examine the chemical composition of the precipitate, identifying calcite and vaterite as the main mineral phases. Bacterium traces were noted on crystal surfaces in SEM images, suggesting a higher adsorptive capacity for irregular precipitates than well-shaped crystals. |
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