Carbon Dioxide Chemically Responsive Switchable Gas Valves with Protonation‐Induced Liquid Gating Self‐Adaptive Systems

Abstract

Carbon dioxide (CO2) capture and storage technologies are promising to limit CO2 emission from anthropogenic activities, to achieve carbon neutrality goals. CO2 capture requires one to separate CO2 from other gases, and therefore a gas flow system that exhibits discernible gating behaviors for CO2 would be very useful. Here we propose a self‐adaptive CO2 gas valve composed of chemically responsive liquid gating systems. The transmembrane critical pressures of the liquid gate vary upon the presence of CO2, due to the superamphiphiles assembled by poly(propylene glycol) bis(2‐aminopropyl ether) and oleic acid in gating liquids that are protonated specifically by CO2. It is shown that the valve can perform self‐adaptive regulation for specific gases and different concentrations of CO2. This protonation‐induced liquid gating mechanism opens a potential platform for applications of CO2 separators, detectors, sensors and beyond.

Fluid manipulationviamultifunctional lubricant infused slippery surfaces: principle, design and applications

“…In 2022, Lei et al proposed an adaptive CO 2 gas valve consisting of a chemically reactive liquid gate system. 28 The critical pressure across the membrane of the liquid gate varies with the presence of carbon dioxide due to the assembly of a super-amphiphilic compound of poly(propylene glycol) bis(2-aminopropyl ether) and oleic acid in the gate liquid that is specifically protonated by carbon dioxide. It was shown that the valve could be adaptively regulated for specific gases and different concentrations of carbon dioxide.…”

Bioinspired Photo-Responsive Liquid Gating Membrane

“…A variety of external stimulus-responsive liquid gating systems have been developed on the basis of the pressure-driven system. These responsive liquid gating systems will be switched between open and closed states under external stimulus, such as light [ 16 ], optothermal [ 17 ], CO 2 [ 18 ], electric field and magnetic field [ 19 ], and have been successfully applied in the fields of multiphase separation, controllable gas valves and drug delivery [ 20 ]. Among these, as a precise controllable and contactless external stimulus, light shows great potential in developing the smart responsive liquid gating system [ 21 , 22 ].…”

Wetting-Induced Water Promoted Flow on Tunable Liquid–Liquid Interface-Based Nanopore Membrane System

“…Recent progress proposed liquid has many advantages − such as a molecular-scale smooth surface and self-recovery. For example, a liquid-based membrane system can separate the three-phase air–water–oil mixture by accurately changing the gating threshold pressure ,− applied to the liquid–liquid interface. The interface can also recognize different multiphase liquids by only permeating the same species of liquid through superamphiphilic porous nanofibrous or supramolecular framework assembled membranes because the wettability can also be tuned by choosing different liquid–liquid interfaces.…”