Functional membranes via nanoparticle self-assembly

Green, Erica; Fullwood, Emily; Selden, Julieann; Zharov, Ilya

doi:10.1039/c5cc01388g

Cited by 25 publications

(17 citation statements)

References 101 publications

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“…However, pore sizes of membranes prepared by self-assembly of molecular building blocks are firmly set by the size of the molecules; controlling the membrane pore size thus usually involves a change of molecular building blocks and associated cumbersome changes in the synthetic protocol. Assembling nanoporous membranes from nanoscale building blocks, such as surface-functionalized nanoparticles, provides an attractive alternative. , These building blocks cover a wide range of sizes and compositions and thus enable a straightforward preparation of membranes with a wide range of nanopore sizes and diverse surface chemistry …”

Section: Introductionmentioning

confidence: 99%

“…21,22 These building blocks cover a wide range of sizes and compositions and thus enable a straightforward preparation of membranes with a wide range of nanopore sizes and diverse surface chemistry. 23 The main challenge in the preparation of membranes from nanoparticles is mechanical stability. When layered as a film, nanoparticles only interact weakly through van der Waals interactions and thus do not provide stable membranes.…”

Section: ■ Introductionmentioning

confidence: 99%

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Responsive Nanoporous Membranes with Size Selectivity and Charge Rejection from Self-Assembly of Polyelectrolyte “Hairy” Nanoparticles

Eygeris¹,

White²,

Wang³

et al. 2018

ACS Appl. Mater. Interfaces

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We report the preparation and characterization of charged nanoporous membranes by self-assembly of “hairy” silica nanoparticles (HNPs) functionalized with polyelectrolyte copolymer brushes. We show that HNP membranes possess high water flux, have well-defined pore sizes, and rejection up to 80% of charged species in solution. The properties of these membranes can be tuned by controlling the length and composition of polymer brushes and the electrolyte concentration in solution. We demonstrate that membrane pore sizes undergo changes of up to 40% in response to changes in the ionic strength of the salt solution. Using MD computer simulations of a coarse-grained model, we link these tunable properties to the conformations of polymer chains in the spaces between randomly packed HNPs. As polymer length increases, the polymers fill the interparticle gaps, and the pore size decreases markedly. On the basis of their straightforward fabrication and tunable properties, HNP membranes may find applications in size- and charge-selective separations, water desalination, and responsive devices.

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Section: Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

Responsive Nanoporous Membranes with Size Selectivity and Charge Rejection from Self-Assembly of Polyelectrolyte “Hairy” Nanoparticles

Eygeris¹,

White²,

Wang³

et al. 2018

ACS Appl. Mater. Interfaces

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“…Commercial membranes with different pore sizes are already being used for many size-selective separations applications, ranging from water desalination through reverse osmosis process to bioseparation, and many new applications have been envisioned. [1][2][3][4] Specifically, organic solvent nanofiltration (OSN) is an emerging area of application because of its promise of lower energy consumption in comparison to other separation methods such as distillation. 5,6 As the OSN process typically involves smaller organic molecules, a dense network with a small pore size is necessary.…”

Section: Introductionmentioning

confidence: 99%

Crosslinked Carbon Nano Dots Membranes for Organic Solvent Nanofiltration

Abbaszadeh¹,

Atkinson²,

Trinh³

et al. 2021

Preprint

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We report a facile synthesis strategy of a membrane active layer consisting of crosslinked carbon nano dots through a layer-by-layer process and the application of these membranes in organic solvent nanofiltration. The synthesized membrane is stable in organic solvents for a long duration, displays tight molecular weight cut off, and fluoresces under UV light, allowing one to capture mechanical failure.

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“…Polymer-grafted solid or porous core particles are investigated with great interest for their use in adsorption [1], separation devices [2] and as components of hybrid membranes [3][4][5]. These hybrid particles can be packed into porous beds and they combine the intrinsic properties of the core particles and of the polymers grafted on them [6].…”

Section: Introductionmentioning

confidence: 99%

Thermally triggered on demand permeability of hybrid silica beds made of packed thermoresponsive organo-silica microparticles

Jadhav¹,

Spalletta²,

Scalarone³

2019

Express Polym. Lett.

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This work reports the preparation and testing of porous beds made from packed vinylated silica microparticles (SiMPs) grafted with thermoresponsive poly(N-isopropylacrylamide) (PNIPAM) and exhibiting on demand thermally triggered permeability. PNIPAM-grafted hybrid SiMPs with diameters of 1.40-1.55 µm were synthesized and characterized with Attenuated Total Reflection Fourier Transform Infrared Spetroscopy (ATR-FTIR), Thermogravimetric Analysis (TGA), Flow Particle Image Analysis (FPIA) and Scannning Electron Miscroscopy (SEM) to elucidate their composition and morphology. The PNIPAM-grafted SiMPs were used to prepare thermoresponsive beds of dimensions 1×0.5×0.5 cm inside filtration tubes. The thermo-regulated permeability of solutions of selected model compounds, namely caffeine, ketoprofen, orange II, bromocresol green and cresol red across the hybrid beds was tested by calculating the retention percentage of the model compounds at temperatures below and above the lower critical solution temperature (LCST) of PNIPAM. The results showed a clear control over the permeability of the packed hybrid beds mediated by external temperature changes. This control was achieved by virtue of the switchable nanovalves created by the thermoresponsive PNIPAM present in the inter-particle voids of the packed beds.

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Functional membranes via nanoparticle self-assembly

Cited by 25 publications

References 101 publications

Responsive Nanoporous Membranes with Size Selectivity and Charge Rejection from Self-Assembly of Polyelectrolyte “Hairy” Nanoparticles

Responsive Nanoporous Membranes with Size Selectivity and Charge Rejection from Self-Assembly of Polyelectrolyte “Hairy” Nanoparticles

Crosslinked Carbon Nano Dots Membranes for Organic Solvent Nanofiltration

Thermally triggered on demand permeability of hybrid silica beds made of packed thermoresponsive organo-silica microparticles

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