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Full-Text Articles in Membrane Science
Atomically Thin Nanoporous Graphene Membranes For Fluid Separation, Anika O. K. Wong
Atomically Thin Nanoporous Graphene Membranes For Fluid Separation, Anika O. K. Wong
Electronic Thesis and Dissertation Repository
Membrane separation applications such as water desalination and carbon capture require high permeance and selectivity. For such processes, nanoporous graphene membranes promise 100-fold higher permeance at comparable selectivity to conventional polymer membranes, but remain under development. This thesis reports fluid permeance through both simulated and experimental graphene nanopores. Molecular dynamics simulations were performed to investigate liquid advection-diffusion through graphene nanopores and how the transport rates differ from continuum predictions. Furthermore, a technique for measuring the gas permeance of nanoscopic areas of graphene was developed. Here, a single layer of graphene seals a ~10 nm diameter hole in a multi-layer graphene …
Inherently Porous Atomically Thin Membranes For Gas Separation, Harpreet Atwal
Inherently Porous Atomically Thin Membranes For Gas Separation, Harpreet Atwal
Electronic Thesis and Dissertation Repository
Membranes made from atomically thin materials promise hundreds of times higher production rates than conventional polymer membranes for separation applications. Graphene is impermeable to gases but becomes selectively permeable once pores are introduced into it but creating trillions of nanopores over large areas is difficult. By instead choosing an inherently porous two-dimensional material with naturally identical pores repeated at high density, we may circumvent this challenge. In this work, we explore the potential of two candidate materials, 2D polyphenylene and graphdiyne. We synthesize cyclohexane-m-phenylene, a monomer of 2D polyphenylene. We then develop an atomic force microscopy technique for measuring the …