期刊
ACS NANO
卷 14, 期 10, 页码 12761-12770出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.0c03173
关键词
confined fluids; dielectric constant; universal reduction; Langevin function; multiscale; molecular dynamics
类别
资金
- Center for Enhanced Nanofluidic Transport (CENT), an Energy Frontier Research Center - U.S. Department of Energy, Office of Science, Basic Energy Sciences [DESC0019112]
- National Science Foundation [1545907, 1708852, 1720633, 1921578]
- National Science Foundation (NSF) [001053575]
- state of Illinois
- NSF [OCI-0725070, ACI-1238993]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1708852] Funding Source: National Science Foundation
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1720633] Funding Source: National Science Foundation
- Div Of Civil, Mechanical, & Manufact Inn
- Directorate For Engineering [1921578] Funding Source: National Science Foundation
Dielectric permittivity is central to many biological and physiochemical systems, as it affects the long-range electrostatic interactions. Similar to many fluid properties, confinement greatly alters the dielectric response of polar liquids. Many studies have focused on the reduction of the dielectric response of water under confinement. Here, using molecular dynamics simulations, statistical-mechanical theories, and multiscale methods, we study the out-of-plane (z-axis) dielectric response of protic and aprotic fluids confined inside slit-like graphene channels. We show that the reduction in perpendicular permittivity is universal for all the fluids and exhibits a Langevin-like behavior as a function of channel width. We show that this reduction is due to the favorable in-plane (x-y plane) dipole dipole electrostatic interactions of the interfacial fluid layer. Furthermore, we observe an anomalously low dielectric response under an extreme confinement.
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