期刊
ACS NANO
卷 13, 期 1, 页码 134-142出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.8b04875
关键词
nanopore; graphene membrane; atomic layer deposition; nanofluidics; pressurized flow
Driven by the need of maximizing performance, membrane nanofabrication strives for ever thinner materials aiming to increase permeation while evoking inherent challenges stemming from mechanical stability and defects. We investigate this thickness rationale by studying viscous transport mechanisms across nanopores when transitioning the membrane thickness from infinitely thin to finite values. We synthesize double-layer graphene membranes containing pores with diameters from similar to 6 to 1000 nm to investigate liquid permeation over a wide range of viscosities and pressures. Nanoporous membranes with thicknesses up to 90 nm realized by atomic layer deposition demonstrate of the entrance resistance for aspect ratios up to one. Liquid permeation across these atomically thin pores is limited by viscous dissipation at the pore entrance. Independent of thickness and universal for porous materials, this entrance resistance sets an upper bound to the viscous transport. Our results imply that membranes with near-ultimate permeation should feature rationally selected thicknesses based on the target solute size for applications ranging from osmosis to microfiltration and introduce a proper perspective to the pursuit of ever thinner membranes.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据