Monolayer microgel composite membranes with tunable permeability

Barth, Monika; Wiese, Martin; Ogieglo, Wojciech; Go, Dennis; Kuehne, Alexander J. C.; Weßling, Matthias

doi:10.1016/j.memsci.2018.03.037

Cited by 36 publications

(23 citation statements)

References 62 publications

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“…Survey spectra were collected using pass energy of 160 eV A spectroscopic ellipsometer M-2000 UI operating in a wavelength range 192 -1690 nm coupled with light focusing optics (300 micron, short axis) and modeling software CompleteEASE v.5.24 was used to perform polyamide layer thickness measurements. The procedure is described in detail elsewhere [39,40]. In brief, the ellipsometric spectra were recorded over a square sample in equal steps in x and y directions to produce 4 x 4 mm maps.…”

Section: Membrane Characterizationmentioning

confidence: 99%

Defect-free highly selective polyamide thin-film composite membranes for desalination and boron removal

Ali

Sunbul

Pacheco

et al. 2019

Journal of Membrane Science

107

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Removal of boron from saline water sources has presented a major challenge for commercially available reverse osmosis desalination membranes. In this work, we report the boron and sodium chloride separation properties of truly defect-free, highly selective, interfacially polymerized aromatic polyamide thin-film composite membranes. The fabricated membranes show potential for separating sodium chloride with a maximum rejection of 99.6% obtained for the optimized film-forming protocol under lab-scale brackish water desalination conditions. This translated into promising boron rejection performance with rejections of up to 99% at pH 10, higher than a number of commercially available reverse osmosis membranes tested in-house. Comprehensive characterization including X-ray photoelectron spectroscopy, atomic force microscopy, scanning electron microscopy, ellipsometry, and surface charge measurements revealed intimate insights on interfacially polymerized polyamide membrane structure-property relationships. Increased membrane crosslinking was shown to be the primary determining factor for membrane permselectivity performance. Furthermore, relationships were established between microstructural properties such as crosslinking and morphological characteristics like surface roughness, highlighting an intricate and complex structure formation mechanism.

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Section: Membrane Characterizationmentioning

confidence: 99%

Defect-free highly selective polyamide thin-film composite membranes for desalination and boron removal

Ali

Sunbul

Pacheco

et al. 2019

Journal of Membrane Science

107

View full text Add to dashboard Cite

show abstract

“…36,37 To prepare functionalized membranes, nowadays usually porous organic or inorganic membranes are subsequently modied with linear PNIPAM chains or with PNIPAM based microgels. [38][39][40][41][42][43][44][45] However, all these approaches require multiple-step procedures and are limited to commercially available supports for functionalization. In contrast to that, a free-standing cross-linked microgel lm or membrane would offer many advantages for surface modications, especially when three-dimensional objects or wells should be coated or wrapped.…”

Section: Introductionmentioning

confidence: 99%

UV cross-linked smart microgel membranes as free-standing diffusion barriers and nanoparticle bearing catalytic films

et al. 2021

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“…From an application-oriented point of view, the presented synthesis procedure for core-shell microgels seems to open a possibility for the development of a full set of temperature-dependent switchable microreactors by hybridization of the microgel particles with different metal nanoparticles. In addition, the particles could serve as membrane material with tunable permeation characteristics, by coating an inorganic membrane template with the different microgels [49].…”

Section: Discussionmentioning

confidence: 99%

Tuning the Swelling Properties of Smart Multiresponsive Core-Shell Microgels by Copolymerization

2019

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The present study focuses on the development of multiresponsive core-shell microgels and the manipulation of their swelling properties by copolymerization of different acrylamides—especially N-isopropylacrylamide (NIPAM), N-isopropylmethacrylamide (NIPMAM), and NNPAM—and acrylic acid. We use atomic force microscopy for the dry-state characterization of the microgel particles and photon correlation spectroscopy to investigate the swelling behavior at neutral (pH 7) and acidic (pH 4) conditions. A transition between an interpenetrating network structure for microgels with a pure poly-N,-n-propylacrylamide (PNNPAM) shell and a distinct core-shell morphology for microgels with a pure poly-N-isopropylmethacrylamide (PNIPMAM) shell is observable. The PNIPMAM molfraction of the shell also has an important influence on the particle rigidity because of the decreasing degree of interpenetration. Furthermore, the swelling behavior of the microgels is tunable by adjustment of the pH-value between a single-step volume phase transition and a linear swelling region at temperatures corresponding to the copolymer ratios of the shell. This flexibility makes the multiresponsive copolymer microgels interesting candidates for many applications, e.g., as membrane material with tunable permeability.

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Monolayer microgel composite membranes with tunable permeability

Cited by 36 publications

References 62 publications

Defect-free highly selective polyamide thin-film composite membranes for desalination and boron removal

Defect-free highly selective polyamide thin-film composite membranes for desalination and boron removal

UV cross-linked smart microgel membranes as free-standing diffusion barriers and nanoparticle bearing catalytic films

Tuning the Swelling Properties of Smart Multiresponsive Core-Shell Microgels by Copolymerization

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