Expanding the gallery of solvent-free nanofluids: Using layered double hydroxides as core nanostructures

• Published in: Chemical engineering journal (Lausanne, Switzerland : 1996) Vol. 455; p. 140797
• Main Authors: Ju, Xiaoqian, Yang, Zhiyuan, Wang, Dechao, Duan, Xinbo, Xin, Yangyang, Zhu, Hanbo, Li, Xiaoqian, Li, Yinyan, Yao, Dongdong, Zheng, Yaping
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.01.2023
• Subjects: CO2 selective capture; Layered double hydroxides; Solvent-free nanofluids; Two-dimensional materials; Two-dimensional materials; CO2 selective capture; Solvent-free nanofluids; Layered double hydroxides
• ISSN: 1385-8947
• DOI: 10.1016/j.cej.2022.140797

•A universal strategy for converting LDHs into solvent-free nanofluids (SFNs).•The synthesis of LDH-F depends on the reactivity of the both end groups of the OS.•Significant increase in stability and dispersion ability of LDHs.•The processability of LDHs is obviously increased by the oligomer grafting. Solvent-free nanofluids (SFNs), as an emerging category of materials, have shown significant potential in various fields. However, SFNs based on two-dimensional (2D) materials are rarely reported and have not been fully explored till now. Herein, we have demonstrated a general technique to convert layered double hydroxides (LDHs) into a new type of steady, homogeneous solvent-free LDHs nanofluids (LDH-F) by connecting corona-canopy species with LDHs nanosheets (LDH-NS) through the covalent bonding. As expected, LDH-F combined the fluidity with the functionality of the LDHs core nanostructure. The liquid-like properties enable LDH-F an excellent dispersion properties and the superior stability even after 100 days. To verify the universality of this method, different corona-canopy species and LDHs metal compositions were both investigated. As a proof concept, CO2 selective sorption performance was investigated by both experimental and simulation methodologies. Remarkably, this work not only expands the gallery of SFNs, but also provides a universal approach to preparing 2D materials-based SFNs.