研究論文

Miho Ariyoshi, Shigenori Fujikawa, Toyoki Kunitake

Design of Highly Efficient Nanomembranes Toward Direct Air Capture. Essential Role of Nanolayer Interface

Advanced Materials Interfaces: Early View
2025.08.23
  • 研究論文
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研究論文概要

The role of membrane technology is growing in the mitigation of global warming via direct capture of CO2 from the atmosphere (DAC). Yet achieving both high permeability and selectivity remains challenging. In this study, the development of free-standing, nanometer-thick membranes is presented that are composed of layers of poly(dimethylsiloxane) (PDMS) and poly(ethylene glycol) (PEG). These nanomembranes are prepared by sequential spin coating of the precursor polymer solution and the subsequent radical cross-linking. The addition of carbon nanotube or cellulose nanofiber enhanced the physical stability of the nanomembrane. One of those nanomembranes exhibited record-breaking CO2 permeability (> 10,000 GPU) and CO2/N2 selectivity (>50) at ambient conditions. This gas permeation is a kinetic process and interface-controlled. This study offers a new design paradigm for highly efficient CO2 separation.

Graphical Abstract: Novel nanometer-thick membranes are developed from multi-layers of siloxane and oxyethylene polymers. Such polymers can give record-high CO2 permeability of 10000 GPU and satisfactory CO2/N2 selectivity of 50. This permeation is based on a kinetic process, and interface-controlled. This study offers a new approach for efficient CO2 separation including direst air capture.
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