Nanoporous Aluminum Oxide Membranes for Filtration and Biofunctionalization

Thormann, Annika; Teuscher, Nico; Pfannmöller, M.; Rothe, Ulrich; Heilmann, Andreas

doi:10.1002/smll.200600582

Cited by 86 publications

(53 citation statements)

References 28 publications

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“…Nanoporous membranes for liquid transport or filtration have been also manufactured from a wide variety of materials [167]: alumina [168][169][170][171], silicon [172], SiC [173], silica [174], carbon [161], nanoporous crystalline aerogels [166], etc. Thormann et al [171] observed that the flow rate of ethanol in nanoporous alumina membranes increased both with larger pore diameters and with thinner samples.…”

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Nanoporous polymeric materials: A new class of materials with enhanced properties

Notario

Pinto

Rodríguez‐Pérez

2016

Progress in Materials Science

179

125

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a b s t r a c tNanoporous polymeric materials are porous materials with pore sizes in the nanometer range (i.e., below 200 nm), processed as bulk or film materials, and from a wide set of polymers. Over the last several years, research and development on these novel materials have progressed significantly, because it is believed that the reduction of the pore size to the nanometer range could strongly influence some of the properties of porous polymers, providing unexpected and improved properties compared to conventional porous and microporous polymers and non-porous solids.In this review, the key properties of these nanoporous polymeric materials (mechanical, thermal, dielectric, optical, filtration, sensing, etc.) are analyzed. The experimental and theoretical results obtained up to date related to the structure-property relations are presented. In several sections, in order to present a more compressive approach, the trends obtained for nanoporous polymers are compared to those for metallic and ceramic nanoporous systems. Moreover, some specific characteristics of these materials, such as the consequences of the confinement of both gas and solid phases, are described. Likewise, the main production methods are briefly described. Finally, some of the potential applications of these materials are also discussed in this paper.

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“…Thormann et al [171] observed that the flow rate of ethanol in nanoporous alumina membranes increased both with larger pore diameters and with thinner samples. However, the superior adsorptive behavior of bulky dyes (10 times higher in the best case) compared to commercial AC was found by Han and coworkers [161] in nanoporous carbon membranes.…”

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confidence: 99%

Nanoporous polymeric materials: A new class of materials with enhanced properties

Notario

Pinto

Rodríguez‐Pérez

2016

Progress in Materials Science

179

125

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“…Ion-track etched membranes show a better size cutoff, but their porosity is too low for most practical uses. Alternatively, anodized nanoporous materials, 7 for example, nanoporous alumina and nanoporous silica, have gained considerable attention due to the well-ordered cylindrical pores and narrow pore size distribution. However, weak mechanical properties limit their resistance to high pressure in a convection mode.…”

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confidence: 99%

Gyroid Nanoporous Membranes with Tunable Permeability

Li¹,

Schulte²,

Clausen³

et al. 2011

ACS Nano

102

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Understanding the relevant permeability properties of ultrafiltration membranes is facilitated by using materials and procedures that allow a high degree of control on morphology and chemical composition. Here we present the first study on diffusion permeability through gyroid nanoporous cross-linked 1,2-polybutadiene (1,2-PB) membranes with uniform pores that, if needed, can be rendered hydrophilic. The gyroid porosity has the advantage of isotropic percolation with no need for structure prealignment. Closed (skin) or opened (nonskin) outer surface can be simply realized by altering the interface energy in the process of membrane fabrication. The morphology of the membranes' outer surface was investigated by scanning electron microscopy, contact angle, and X-ray photoelectron spectroscopy. The effective diffusion coefficient of glucose decreases from nonskin, to one-sided skin to two-sided skin membranes, much faster than expected by a naive resistance-in-series model; the flux through the two-sided skin membranes even increases with the membrane thickness. We propose a model that captures the physics behind the observed phenomena, as confirmed by flow visualization experiments. The chemistry of 1,2-PB nanoporous membranes can be controlled, for example, by hydrophilic patterning of the originally hydrophobic membranes, which allows for different active porosity toward aqueous solutions and, therefore, different permeability. The membrane selectivity is evaluated by comparing the effective diffusion coefficients of a series of antibiotics, proteins, and other biomolecules; solute permeation is discussed in terms of hindered diffusion. The combination of uniform bulk morphology, isotropically percolating porosity, controlled surface chemistry, and tunable permeability is distinctive for the presented gyroid nanoporous membranes.

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“…[1][2][3][4][5][6][7][8][9] Anodic porous alumina is frequently used as a mask for the fabrication of nanostructures on substrates in various types of dry process, such as vacuum deposition, sputtering, and dry etching. [10][11][12][13] The naturally occurring ordered hole array structure of anodic porous alumina, which is formed by the anodization of Al in an acidic electrolyte, allows the fabrication of nanostructures with desired dimensions on substrates through such dry processes.…”

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confidence: 99%

Facile preparation of porous alumina through-hole masks for sputtering by two-layer anodization

Yanagishita

Masuda

2016

AIP Advances

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Highly ordered porous alumina through-hole masks were fabricated on a substrate by combining two-layer anodization with subsequent through-holing by selective etching. This process allowed the fabrication of porous alumina masks without an increase in pore size during the etching performed for through-holing. Additionally, the process contributed to improved operability in the setting of the masks on substrates because the second anodizing layer acts as a supporting layer for the handling of the mask. The fabrication of ordered Au nanodot arrays was demonstrated as an example application of the through-hole masks obtained by the present process.

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Nanoporous Aluminum Oxide Membranes for Filtration and Biofunctionalization

Cited by 86 publications

References 28 publications

Nanoporous polymeric materials: A new class of materials with enhanced properties

Nanoporous polymeric materials: A new class of materials with enhanced properties

Gyroid Nanoporous Membranes with Tunable Permeability

Facile preparation of porous alumina through-hole masks for sputtering by two-layer anodization

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