Microscale heterogeneous pore occupancy with variable background resistance

McRae, Oliver; Ramakrishnan, T.S.; Bird, James

doi:10.1016/j.jcis.2021.10.029

Cited by 3 publications

(1 citation statement)

References 29 publications

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“…However, we cannot completely rule out the possibility of the capillarity-induced wicking of water into the PDMS-filled pores displacing PDMS akin to the wicking of water into air-filled pores. [41][42][43] We also confirm that PDMS introduced into the nanopores of the NP packing without using solvent [26] also undergoes expulsion from the nanopores upon exposure to high humidity or water, indicating that this behavior does not depend on the presence of a residual solvent.…”

Section: Resultssupporting

confidence: 60%

Water‐Induced Separation of Polymers from High Nanoparticle‐Content Nanocomposite Films

Kim

Füredi

Venkatesh

et al. 2023

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Polymer nanocomposites with high loadings of nanoparticles (NPs) exhibit exceptional mechanical and transport properties. Separation of polymers and NPs from such nanocomposites is a critical step in enabling the recycling of these components and reducing the potential environmental hazards that can be caused by the accumulation of nanocomposite wastes in landfills. However, the separation typically requires the use of organic solvents or energy‐intensive processes. Using polydimethylsiloxane (PDMS)‐infiltrated SiO2 NP films, we demonstrate that the polymers can be separated from the SiO2 NP packings when these nanocomposites are exposed to high humidity and water. The findings indicate that the charge state of the NPs plays a significant role in the propensity of water to undergo capillary condensation within the PDMS‐filled interstitial pores. We also show that the size of NPs has a crucial impact on the kinetics and extent of PDMS expulsion, illustrating the importance of capillary forces in inducing PDMS expulsion. We demonstrate that the separated polymer can be collected and reused to produce a new nanocomposite film. The work provides insightful guidelines on how to design and fabricate end‐of‐life recyclable high‐performance nanocomposites.

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Section: Resultssupporting

confidence: 60%

Water‐Induced Separation of Polymers from High Nanoparticle‐Content Nanocomposite Films

Kim

Füredi

Venkatesh

et al. 2023

Small

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Does backflow occur in forced imbibition into a dual-permeability pore network?

Huang,

Wang,

Liu

et al. 2024

International Journal of Multiphase Flow

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Optimal displacement of immiscible two-phase fluids in a pore doublet

2023

Physics of Fluids

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Multiphase fluid flow in a pore doublet is a fundamental problem and is important for understanding the transport mechanisms of multiphase flows in porous media. During the displacement of immiscible two-phase fluids in a pore doublet, the transport process is influenced not only by the capillary and viscous forces, but also the channel geometry. In this paper, a mathematical model is presented of the two-phase fluid displacement in a pore doublet considering the effects of capillary force, viscous force, and the geometric structure. This leads to a new and more general analytical solution for the pore doublet system, and it is found that the displacement process is dominated by the capillary number, viscosity, and radius ratios. Also, the optimal displacement is defined, which refers to the wetting fluids in the two daughter channels breaking through the branches simultaneously (i.e., both having the same breakthrough time). Also, the critical capillary number corresponding to the optimal displacement is obtained, which is related to the radius ratio of the two daughter channels and the viscosity ratio of the two immiscible fluids. Finally, analytical results are presented for the displacement in the pore doublet, which can be used to explain and understand the preferential flows in porous media, such as for improving oil recovery from porous media; these are usually observed in oil recovery, groundwater pollution, and the geological sequestration of carbon dioxide.

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Microscale heterogeneous pore occupancy with variable background resistance

Cited by 3 publications

References 29 publications

Water‐Induced Separation of Polymers from High Nanoparticle‐Content Nanocomposite Films

Water‐Induced Separation of Polymers from High Nanoparticle‐Content Nanocomposite Films

Does backflow occur in forced imbibition into a dual-permeability pore network?

Optimal displacement of immiscible two-phase fluids in a pore doublet

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