Colossal Effect of Nanopore Surface Ionic Charge on the Dynamics of Confined Water
Fuente:
arXiv
Gespeichert in:
| Hauptverfasser: | , , , , , , , , , , , |
|---|---|
| Format: | Preprint |
| Veröffentlicht: |
2025
|
| Schlagworte: | |
| Online-Zugang: | |
| Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
| _version_ | 1866915511033397248 |
|---|---|
| author | Mozhdehei, Armin Lenz, Philip Gries, Stella Meinert, Sophia-Marie Lefort, Ronan Zanotti, Jean-Marc Berrod, Quentin Appel, Markus Busch, Mark Huber, Patrick Fröba, Michael Morineau, Denis |
| author_facet | Mozhdehei, Armin Lenz, Philip Gries, Stella Meinert, Sophia-Marie Lefort, Ronan Zanotti, Jean-Marc Berrod, Quentin Appel, Markus Busch, Mark Huber, Patrick Fröba, Michael Morineau, Denis |
| contents | Interfacial interactions significantly alter the fundamental properties of water confined in mesoporous structures, with crucial implications for geological, physicochemical, and biological processes. Herein, we focused on the effect of changing the surface ionic charge of nanopores with comparable pore size (3.5-3.8 nm) on the dynamics of confined liquid water. The control of the pore surface ionicity was achieved by using two periodic mesoporous organosilicas (PMOs) containing either neutral or charged forms of a chemically similar bridging unit. The effect on the dynamics of water at the nanoscale was investigated in the temperature range of 245 -300 K, encompassing the glass transition by incoherent quasielastic neutron scattering (QENS), For both types of PMOs, the water dynamics revealed two distinct types of molecular motions: rapid local movements and translational jump diffusion. While the neutral PMO induces a moderate confinement effect, we show that the charged PMO drastically slows down water dynamics, reducing translational diffusion by a factor of four and increasing residence time by an order of magnitude. Notably, by changing the pore filling values, we demonstrate that for charged pore this effect extends beyond the interfacial layer of surface-bound water molecules to encompass the entire pore volume. Thus, our observation indicates a dramatic change in the long-range character of the interaction of water confined in nanopores with surface ionic charge compared to a simple change in hydrophilicity. This is relevant for the understanding of a broad variety of applications in (nano)technological phenomena and processes, such as nanofiltration and membrane design. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_19802 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Colossal Effect of Nanopore Surface Ionic Charge on the Dynamics of Confined Water Mozhdehei, Armin Lenz, Philip Gries, Stella Meinert, Sophia-Marie Lefort, Ronan Zanotti, Jean-Marc Berrod, Quentin Appel, Markus Busch, Mark Huber, Patrick Fröba, Michael Morineau, Denis Chemical Physics Interfacial interactions significantly alter the fundamental properties of water confined in mesoporous structures, with crucial implications for geological, physicochemical, and biological processes. Herein, we focused on the effect of changing the surface ionic charge of nanopores with comparable pore size (3.5-3.8 nm) on the dynamics of confined liquid water. The control of the pore surface ionicity was achieved by using two periodic mesoporous organosilicas (PMOs) containing either neutral or charged forms of a chemically similar bridging unit. The effect on the dynamics of water at the nanoscale was investigated in the temperature range of 245 -300 K, encompassing the glass transition by incoherent quasielastic neutron scattering (QENS), For both types of PMOs, the water dynamics revealed two distinct types of molecular motions: rapid local movements and translational jump diffusion. While the neutral PMO induces a moderate confinement effect, we show that the charged PMO drastically slows down water dynamics, reducing translational diffusion by a factor of four and increasing residence time by an order of magnitude. Notably, by changing the pore filling values, we demonstrate that for charged pore this effect extends beyond the interfacial layer of surface-bound water molecules to encompass the entire pore volume. Thus, our observation indicates a dramatic change in the long-range character of the interaction of water confined in nanopores with surface ionic charge compared to a simple change in hydrophilicity. This is relevant for the understanding of a broad variety of applications in (nano)technological phenomena and processes, such as nanofiltration and membrane design. |
| title | Colossal Effect of Nanopore Surface Ionic Charge on the Dynamics of Confined Water |
| topic | Chemical Physics |
| url | https://arxiv.org/abs/2509.19802 |