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1,201 results on '"Zhou, Xiao‐Ping"'

127. Fracture characterization and permeability prediction by pore scale variables extracted from X-ray CT images of porous geomaterials

Author

Zhao, Zhi, Zhou, Xiao-Ping, and Qian, Qi-Hu

Abstract

Pore scale variables (e.g., porosity, grain size) are important indexes to predict the hydraulic properties of porous geomaterials. X-ray images from ten types of intact sandstones and another type of sandstone samples subjected to triaxial compression are used to investigate the permeability and fracture characteristics. A novel double threshold segmentation algorithm is proposed to segment cracks, pores and grains, and pore scale variables are defined and extracted from these X-ray CT images to study the geometric characteristics of microstructures of porous geomaterials. Moreover, novel relations among these pore scale variables for permeability prediction are established, and the evolution process of cracks is investigated. The results indicate that the pore-scale permeability is prominently improved by cracks. In addition, excellent agreements are found between the measured and the estimated pore scale variables and permeability. The established correlations can be employed to effectively identify the hydraulic properties of porous geomaterials.

Published
2024
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129. A Self‐Assembled Capsule for Propylene/Propane Separation.

Author

Zhou, Chuang‐Wei, Wang, Xue‐Zhi, Xie, Mo, Xia, Ri‐Qin, Luo, Dong, Lian, Zhao‐Xia, Ning, Guo‐Hong, Lu, Weigang, Zhou, Xiao‐Ping, and Li, Dan

Subjects
PROPANE, PROPENE, ALKENES, CHEMICAL industry, NUCLEAR magnetic resonance spectroscopy, BINDING constant
Abstract

The development of energy‐saving technology for the efficient separation of olefin and paraffin is highly important for the chemical industry. Herein, we report a self‐assembled Fe4L6 capsule containing a hydrophobic cavity, which can be used to encapsulate and separate propylene/propane. The successful encapsulation of propylene and propane by the Fe4L6 cage in a water solution was documented by NMR spectroscopy. The binding constants K for the Fe4L6 cage toward propylene and propane were determined to be (5.0±0.1)×103 M−1 and (2.1±0.7)×104 M−1 in D2O at 25 °C, respectively. Experiments and theoretical studies revealed that the cage exhibited multiple weak interactions with propylene and propane. The polymer‐grade propylene (>99.5 %) can be obtained from a mixture of propylene and propane by using the Fe4L6 cage as a separation material in a U‐shaped glass tube. This work provides a new strategy for the separation of olefin/paraffin. [ABSTRACT FROM AUTHOR]

Published
2023
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