Liquid permeation and chemical stability of anodic alumina membranes

Петухов, Д. И.; Buldakov, D. A.; Tishkin, Alexey A.; Lukashin, A. V.; Eliseev, A. A.

doi:10.3762/bjnano.8.60

Cited by 37 publications

(25 citation statements)

References 27 publications

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“…This suggests that the greater quantity of the polymer is introduced into AAO under vacuum suction for the substrate with larger diameter of the channels. This stays in line with increasing liquid permeance of AAO membranes with pore diameters [17].…”

Section: Resultssupporting

confidence: 82%

“…Anodic alumina films, utilized as membrane supports, were prepared by anodic oxidation of high purity aluminum in 0.3 M oxalic acid at 40 V and in 0.3 M sulfuric acid at 25V. The detailed description of the AAO preparation can be found in [15][16][17]. Composite membranes were obtained by spin-coating of 1 wt.% polymer solution in chloroform onto AAO supports under vacuum suction.…”

Section: Methodsmentioning

confidence: 99%

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Composite membranes based on geometrically constrained PIM-1 for dehumidification of gas mixtures

Chernova¹,

Roslyakov²,

Dorofeev³

et al. 2019

Nanosystems: Phys. Chem. Math.

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Composite membranes based on polymer with intrinsic microporosity (PIM-1) confined in the pores of porous anodic alumina (AAO) supports were prepared by spin-coating method under vacuum suction. Water permeance of the membranes was measured at humidities ranging from 10 to 70 %. High permeance towards water vapors reaching the value of ∼ 13700 l/(m 2 •bar•h) coupled with the H 2 O/N 2 selectivity of 1400 was observed at the humidity of 70 % for composite membranes due to the condensation in nanopores of polymer and anodic alumina channels. The obtained selectivity exceeds strongly that of bulk PIM-1 due to confinement of polymer chains mobility in AAO channels. The water vapor sorption capacity for composite membranes exceeds 7 % being governed both by condensation in polymer micropores and anodic alumina channels. Physical ageing of the membranes was monitored for a period of 6 months and then the membranes were subjected to activation in methanol. It was established that physical ageing substantially reduces the water permeance but activation in methanol allows one to partially rejuvenate water transport performance.

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Section: Resultssupporting

confidence: 82%

Section: Methodsmentioning

confidence: 99%

Composite membranes based on geometrically constrained PIM-1 for dehumidification of gas mixtures

Chernova¹,

Roslyakov²,

Dorofeev³

et al. 2019

Nanosystems: Phys. Chem. Math.

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“…It is also noted that there is one report of the precipitation of aragonite nanoparticles within the peptide-functionalized pores of anodic alumina membranes (27). However, as such membranes gradually dissolve in alkaline solutions, releasing aluminum complexes (28), the formation of aragonite cannot be clearly attributed to confinement effects.…”

Section: Discussionmentioning

confidence: 99%

Confinement generates single-crystal aragonite rods at room temperature

Zeng

Kim

Anduix‐Canto

et al. 2018

Proc. Natl. Acad. Sci. U.S.A.

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The topic of calcite and aragonite polymorphism attracts enormous interest from fields including biomineralization and paleogeochemistry. While aragonite is only slightly less thermodynamically stable than calcite under ambient conditions, it typically only forms as a minor product in additive-free solutions at room temperature. However, aragonite is an abundant biomineral, and certain organisms can selectively generate calcite and aragonite. This fascinating behavior has been the focus of decades of research, where this has been driven by a search for specific organic macromolecules that can generate these polymorphs. However, despite these efforts, we still have a poor understanding of how organisms achieve such selectivity. In this work, we consider an alternative possibility and explore whether the confined volumes in which all biomineralization occurs could also influence polymorph. Calcium carbonate was precipitated within the cylindrical pores of track-etched membranes, where these enabled us to systematically investigate the relationship between the membrane pore diameter and polymorph formation. Aragonite was obtained in increasing quantities as the pore size was reduced, such that oriented single crystals of aragonite were the sole product from additive-free solutions in 25-nm pores and significant quantities of aragonite formed in pores as large as 200 nm in the presence of low concentrations of magnesium and sulfate ions. This effect can be attributed to the effect of the pore size on the ion distribution, which becomes of increasing importance in small pores. These intriguing results suggest that organisms may exploit confinement effects to gain control over crystal polymorph.

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“…The AAO substrates were prepared by anodic oxidation of high purity aluminum in oxalic acid at 120 V. To enhance the permeance of the supports, a two-stage oxidation process was employed. The detailed description of the AAO preparation is given in [17,18,20,21].…”

Section: Methodsmentioning

confidence: 99%

Nanoscale architecture of graphene oxide membranes for improving dehumidification performance

Chernova¹,

Петухов²,

Kapitanova³

et al. 2018

Nanosystems: Phys. Chem. Math.

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Thin composite graphene oxide (GO) membranes prepared from the mixture of GO nanoflakes and nanoribbons are proposed to enhance membrane stability at elevated pressure gradients. It is shown that addition of 5-15 % of GO nanoribbons to medium flake graphene oxide during deposition allows up to a 60 % increase in the porosity of GO membranes. The membranes illustrate strong barrier properties to permanent gases with a permeance below 0.01 m 3 /(m 2 •bar•h), while revealing high permeance to water vapor over 50 m 3 /(m 2 •bar•h). This results in H 2 O/N 2 selectivity up to 12500 at water vapor fluxes over 1 m 3 /(m 2 •h) at relative humidity of feed stream of 90 %. Despite ∼ 10 % loss of membrane performance with addition of nanoribbons, the membranes reveal an improved stability to pressure gradients. Irreversible permeance loss of composite membranes does not exceed 10 % as compared to ∼ 35 % performance loss for pure medium flake graphene oxide (MFGO) after long term exposure to 0.1 MPa pressure difference. An improved stability is invoked for the prevention of the irreversible conglomeration of GO flakes and appearance of permanent channels for water transport along the edges of nanoribbons.

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Liquid permeation and chemical stability of anodic alumina membranes

Cited by 37 publications

References 27 publications

Composite membranes based on geometrically constrained PIM-1 for dehumidification of gas mixtures

Composite membranes based on geometrically constrained PIM-1 for dehumidification of gas mixtures

Confinement generates single-crystal aragonite rods at room temperature

Nanoscale architecture of graphene oxide membranes for improving dehumidification performance

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