Search

Your search keyword '"Zhang Jian"' showing total 1,792 results
Start Over Author "Zhang Jian" Publisher american chemical society
1,792 results on '"Zhang Jian"'

13. Enhanced Oil Recovery in Low-Permeability Reservoirs Utilizing Dispersions of Monodisperse Crumpled SiO2 Nanoparticle.

Author

Wang, Xiaomeng, Zhang, Fengfan, Zhang, Jian, Wang, Guang, Zhang, Juan, Lin, Meiqin, Dong, Zhaoxia, and Yang, Zihao

Abstract

Nanomaterials have great potential as novel materials for enhancing oil recovery in low-permeability reservoirs. Spontaneous aggregation hampers their application effectiveness and may lead to irreversible reservoir damage. In this study, monodisperse crumpled SiO2 nanoparticles (C-SiO2) with central radial pore channels were synthesized by using the spherical micelle self-assembly method. After hydrophobic modification, modified C-SiO2 formed a highly stable nanodispersion with the assistance of sodium dodecyl sulfate and octadecanol. Results showed that C-SiO2 exhibited reduced external surface area, increased active sites, and excellent dispersibility. The C-SiO2 dispersion demonstrated excellent temperature tolerance (90 °C) and salt resistance (20000 mg/L, including 4000 mg/L Ca2+), outstanding enhanced oil recovery performance, and negligible reservoir damage. Injecting 0.5 pore volume of the C-SiO2 dispersion at a concentration of 0.025 wt % enhanced oil recovery by 14.25%. The C-SiO2 dispersion effectively mobilized residual oil through the combined action of multiple mechanisms. This study provides an effective approach to enhancing the development of low-permeability reservoirs. It also advances the understanding of C-SiO2 synthesis and stable nanodispersion design, which is crucial for future oil recovery applications. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

43. Boron/MXene Hollow Spheres for Humidity Sensing and Respiration Monitoring.

Author

Zhang, Dinghao, Dong, Lijuan, Dong, Mengwei, Yao, Xingye, Li, Shaozhou, Bi, Hengchang, Huang, Xiao, and Zhang, Jian

Abstract

Boron nanosheets with high surface hydrophilicity and proton conductivity are promising for ionic devices. However, their poor electrical conductivity has severely limited their applications in resistive-type electronic devices. Herein, electrically conductive three-dimensional boron/MXene hollow spheres were prepared by a freeze-drying-assisted self-assembly method. The composites were fabricated into resistive-type humidity sensors, which showed high sensitivity with a three-orders-of-magnitude variation in resistance, a wide detection range (11–97%), fast response and recovery time (4 s/3.8 s), and long-term stability. The excellent humidity sensing performance can be attributed to the abundant hydrophilic groups on both the inner and outer surfaces of open spheres as well as to a coupled hole/proton conducting process. As a proof of concept, real-time remote monitoring of human respiration was achieved by integrating our humidity sensor with a Bluetooth module, enabling differentiation of breathing frequency as rapid as 0.8 s. [ABSTRACT FROM AUTHOR]

Published
2024
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results