近日，课题组博士生高鹏论文“Multidimensional LDH-SiO2 nanomaterials with stearic acid post-modification for effective enhancement of foam stability”被Colloids and Surfaces A: Physicochemical and Engineering Aspects（2023年中科院SCI期刊二区期刊，IF=4.9)接收！
Abstract：
The two-dimensional structure of layered double hydroxides (LDHs) holds great potential for bolstering foam stability which can be utilized in enhanced oil recovery (EOR). However, the sheet stacking and strong hydrophilicity of LDHs greatly hampers their practical applications. In this research, a multi-dimensional composite nanomaterial LDH@SiO2-SA was synthesized using zero-dimensional SiO2 as a template, generating LDH within the limited space of SiO2 and post-modification with stearic acid (SA). The aim was to improve the CO2-foam stability of the amphoteric surfactant lauryl betaine (LB). At an optimal concentration of 0.1 wt%, LDH@SiO2-SA improved the overall performance of LB-based foam by 39.5%. The excellent salt and proper temperature resistance of LDH@SiO2-SA-based foam was confirmed, indicating its potential applications in the underground conditions. The foam stabilization mechanism was elucidated from the perspectives of contact angle, surface tension, foam viscosity, and dispersion of foaming solutions. The results indicated that the composite of SiO2 and LDH formed a spatial site-resistive structure, which helped to alleviate agglomeration and improved its dispersion in the LB foaming solution. Additionally, microscopic foam morphology analysis provided further insights into the foam coarsening process and adsorption behavior of NPs on liquid film. This study offers a viable approach using multi-dimensional nano-composite materials to enhance foam stability.
https://doi.org/10.1016/j.colsurfa.2024.136059
