Kinetic modelling of the gate adsorption of soft porous crystals based on in-situ stress measurements

2023 Fiscal Year Final Research Report

• Project/Area Number: 21H01690
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 27010:Transport phenomena and unit operations-related
• Research Institution: Kyoto University
• Principal Investigator: Watanabe Satoshi 京都大学, 工学研究科, 准教授 (80402957)
• Co-Investigator(Kenkyū-buntansha): 平出 翔太郎 京都大学, 工学研究科, 助教 (60853207) ; 宮原 稔 京都大学, 工学研究科, 教授 (60200200)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: Metal-organic framework / ゲート吸着 / 構造転移 / 自由エネルギー解析 / 原子間力顕微鏡

Outline of Final Research Achievements

Soft porous crystals (SPCs) show a step-wise gas uptake associated with structural transition, called "gate adsorption". It has been reported that the adsorption behavior associated with the structural transition depends on the particle size. To elucidate the particle size dependence of adsorption behavior, it is critical to elucidate the structural transition of single particles, but conventional adsorption isotherm measurements can only measure the averaged behavior of powders. Therefore, a method to measure adsorption behavior associated with structural transition at a single-particle level is required. In this study, we applied an atomic force microscope and measured force curves upon the gate-type structural transition behavior of single particles. By thermodynamically analyzing the obtained repulsive force profiles, we succeeded in observing the gate desorption behavior for each single particle.

Free Research Field

コロイド分散系工学

Academic Significance and Societal Importance of the Research Achievements

ソフト多孔性錯体は，二酸化炭素の高効率回収などカーボンニュートラルの実現に向け，主要な役割を担い得る新規な吸着材料である。本研究では，このソフト多孔性錯体が示す特殊な吸着挙動の解明に向けて，平均的な挙動ではなく，単一粒子の挙動を明確にすることで，解像度の高い現象理解が可能となった。この成果は，今後の吸着分離プロセスへの実装に向け，基礎となるデータとなることが期待される。