2026-10-10T03:45:13Z https://api.figshare.com/v2/oai

oai:figshare.com:article/34003680 2026-09-26T16:11:31Z category_146 category_7 category_21 category_24 category_873 portal_63 item_type_2 month_year_09_2026

Gated Transport of CO₂ through Electrowetted Solid-State Nanopores Zonglin Gu (1579501) Yongchuan Huang (23733444) Binghan Liu (492524) Shuming Zeng (6377645) Binquan Luan (1288623) Space Science Medicine Biotechnology Evolutionary Biology Chemical Sciences not elsewhere classified transported gases due greenhouse effect worldwide g ., c6 fabricated porous membrane covered graphene nanochannels controlled transport provides therefore desirable performance stronger electric fields optimal field strength g ., c24 2 </ sub state nanopores remains separation system based overlooking large nanopores polarized water ). enhanced separation selectivity state nanopores large nanopores system exhibited graphene nanopore enhanced solubility state membranes selectivity ). transport rate selective separation porous solid large nanopore gated transport effortless transport various investigations usually focused sizes comparable simultaneously maximizes results reveal remarkable progress practical approach novel phenomenon large solid great potential great challenge Membrane sieving is one of the most effective and efficient approaches for capturing and separating CO₂ from air or flue gas, and is promising for alleviating the greenhouse effect worldwide. Various investigations have demonstrated that porous solid-state membranes have great potential for CO₂ separation, and remarkable progress has been achieved. To date, researchers have usually focused on solid-state nanopores (e.g., C6) with sizes comparable to those of the transported gases due to their specific gas–pore interactions and therefore desirable performance, while overlooking large nanopores that are inevitably present in a fabricated porous membrane. It is well-known that a large nanopore (e.g., C24) can lose its selectivity because of the effortless transport of both CO₂ and its mixtures (attributed to the trade-off between permeation and selectivity). Therefore, maintaining a high selectivity for CO₂ through large solid-state nanopores remains a great challenge. Here, we present the design of a CO₂/N₂ separation system based on water-covered graphene nanochannels (C24) in an electric field. Using molecular dynamics simulations, we found that upon introducing low electric field strengths, the system exhibited an enhanced separation selectivity of CO₂/N₂ (resulting from the enhanced solubility of CO₂ in polarized water). At stronger electric fields, however, the graphene nanopore is gradually electrowetted, which consequently blocks the passage of both CO₂ and N₂. These results reveal an optimal field strength that simultaneously maximizes the transport rate and enhances the selectivity. This novel phenomenon of electric-field-controlled transport provides a practical approach for the efficient and selective separation of CO₂ and N₂ through large nanopores. 2026-09-26T00:00:00Z Dataset Media 10.1021/acs.langmuir.6c03031.s001 https://figshare.com/articles/media/Gated_Transport_of_CO_sub_2_sub_through_Electrowetted_Solid-State_Nanopores/34003680 CC BY-NC 4.0