Abstract
Periodic mesoporous organosilicas (PMO) have been studied for the first time as a porous matrix for heterogeneous lyophobic systems (HLS) for absorption and storage of mechanical energy by high pressure intrusion-extrusion of electrolyte solutions. It has been shown that the intrusion of LiCl aqueous solutions in ethane-bridged PMO material is irreversible that corresponds to a bumper behavior. The intrusion pressure increases strongly with the salt concentration - from 13 MPa for 5 M LiCl aqueous solution to 37 MPa for 20 M one. Such a pressure rise of 2.8 times is the highest observed for HLS based on mesoporous materials. Due to high intruded volume (0.63–0.72 mL/g) specific absorbed energy achieves 27 J/g, which is close to the best values ever obtained for HLS based on zeosils and mesoporous silica. The characterization shows that after the intrusion-extrusion experiments the ordered pore arrangement largely stays intact, but a slight increase of the mesopore volume is observed.
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