Morphological modification of the surface of polymers by the replication of the structure of anodic aluminum oxide

Eliseev, A. A.; Петухов, Д. И.; Buldakov, D. A.; Иванов, Р. В.; Napolskii, K. S.; Lukashin, A. V.; Tret’yakov, Yu. D.

doi:10.1134/s0021364010190045

Cited by 11 publications

(5 citation statements)

References 19 publications

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“…3b ). The same microstructure was obtained by imprinting of polyethylene terephthalate surface with anodic alumina stamp 12 . One should note that a detailed examination of PIM-1 replicas reveals the presence of nanochannels inside fiber-like nanostructures.…”

Section: Resultsmentioning

confidence: 79%

Enhanced gas separation factors of microporous polymer constrained in the channels of anodic alumina membranes

Chernova

Петухов

Boytsova

et al. 2016

Sci Rep

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New composite membranes based on porous anodic alumina films and polymer of intrinsic microporosity (PIM-1) have been prepared using a spin-coating technique. According to scanning electron microscopy, partial penetration of polymer into the pores of alumina supports takes place giving rise to selective polymeric layers with fiber-like microstructure. Geometric confinement of rigid PIM-1 in the channels of anodic alumina causes reduction of small-scale mobility in polymeric chains. As a result, transport of permanent gases, such as CH4, becomes significantly hindered across composite membranes. Contrary, the transport of condensable gases (CO2, С4H10), did not significantly suffer from the confinement due to high solubility in the polymer matrix. This strategy enables enhancement of selectivity towards CO2 and C4H10 without significant loss of the membrane performance and seems to be prospective for drain and sweetening of natural gas.

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Section: Resultsmentioning

confidence: 79%

Enhanced gas separation factors of microporous polymer constrained in the channels of anodic alumina membranes

Chernova

Петухов

Boytsova

et al. 2016

Sci Rep

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“…Anodic oxidation enables the channel diameter and interpore distance to be controlled for a wide range of interests (pore diameter from 15 to 200 nm; interpore distance from 50 to 500 nm, porosity 10-30%) [22][23][24]. Moreover, the thickness of anodic aluminum oxide (AAO) films can be regulated precisely using conventional electrochemistry methods by controlling the total electric quantity.…”

Section: Introductionmentioning

confidence: 99%

Gas permeation through nanoporous membranes in the transitional flow region

Петухов

Eliseev

2016

Nanotechnology

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An experimental study on the permeability of anodic alumina (20-120 nm) and track-etched (30 nm) nanoporous membranes for different gases in the transitional flow regime is reported in the range of Knudsen numbers from 0.1 to 10. A significant variation (up to 30%) of the membrane permeance for different gases at the same Knudsen numbers is reported with certainty. It is established that this discrepancy relates to a molecule's effective collision area, which is poorly described in the frameworks of conventional gas permeation models. Two models are proposed for the description of the effect: self-diffusion of penetrate gases due to intermolecular collisions and enhancement of the slip flow contribution due to tangential momentum accommodation growth with the decrease of a molecule's effective collision area. The best fit parameters for the simultaneous fit of the experimental data with different models for 30 membrane-gas pairs are given.

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“…These membranes possess a through porosity represented by a closely packed system of cylindrical channels that can be easily formed by anodic oxidation of metallic aluminum. Anodic oxidation enables control over channel diameter and interpore distance in a wide range of values (pore diameter from 15 to 200 nm; interpore distance from 50 to 500 nm; porosity 10–30%). − Moreover, the thickness of anodic aluminum oxide (AAO) films can be regulated precisely using conventional electrochemistry methods by controlling total electric quantity . Variation of anodization voltage during AAO film formation enables preparation of asymmetric membranes with hierarchical porous structures .…”

Section: Introductionmentioning

confidence: 99%

Experimental and Theoretical Study of Enhanced Vapor Transport through Nanochannels of Anodic Alumina Membranes in a Capillary Condensation Regime

et al. 2016

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The pressure-driven flow of condensable and permanent gases was studied experimentally for anodic alumina membranes with channel diameters ranging from 20 to 90 nm depending on feed and permeate pressures. A substantial permeability rise for condensable gases was detected under capillary condensation conditions. A self-consistent theoretical model for mixed liquid–gas transport through the nanopore was suggested based on the obtained experimental results. The model was used for the evaluation of the pressure drop in a liquid defined by menisci curvatures and determination of the optimal conditions to enhance the membrane performance. The highest pressure difference in a liquid can be obtained by decreasing the entrance meniscus curvature with a simultaneous increase in the curvature of the evaporating meniscus. This case was realized in asymmetric membranes with multiple branching of channels into 5 nm nanocapillaries, resulting in up to 10× enhancement of isobutane permeability (up to 450 m3/(m2·bar·h)) in the capillary condensation regime. Combined with a serious selectivity rise for condensable and permanent components of gas mixtures, this enables mesoporous membranes to be successfully utilized in the self-controlled removal of water and hydrocarbon vapors for the conditioning of natural and associated petroleum gas.

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Morphological modification of the surface of polymers by the replication of the structure of anodic aluminum oxide

Cited by 11 publications

References 19 publications

Enhanced gas separation factors of microporous polymer constrained in the channels of anodic alumina membranes

Enhanced gas separation factors of microporous polymer constrained in the channels of anodic alumina membranes

Gas permeation through nanoporous membranes in the transitional flow region

Experimental and Theoretical Study of Enhanced Vapor Transport through Nanochannels of Anodic Alumina Membranes in a Capillary Condensation Regime

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