Porous
alumina
Porous aluminum oxide is an ordered ceramic material featuring regularly arranged nanopores. The membranes provided by SmartMembranes consist of uniform, parallel pore structures with precisely controllable pore sizes in the nanometer range.
The material is available as free-standing membranes or as one-sided closed templates, combining high porosity with thermal stability. Owing to its structural uniformity, porous alumina is particularly well suited as a functional substrate for analytical and microscopic applications.
In addition, porous alumina is widely used as a template for the controlled fabrication of micro- and nanostructures, such as nanotubes, nanorods, or hybrid material systems. This makes it a versatile material platform for applications in analytics, filtration, and nanotechnology.
SmartPor
SmartPor membranes feature round pores with a highly uniform pore diameter. The variation in pore diameter is below 10% and remains constant along the entire pore length, ensuring excellent reproducibility in filtration and analytical applications.
Within the individual aluminum grain boundaries, the pores are arranged in a trigonal pattern, resulting in a highly ordered pore structure. This well-defined geometry enables precise separation performance and makes SmartPor membranes particularly suitable for demanding analytical applications where a narrow pore size distribution is essential.
Standardprodukte
| Interpore distance | Pore diameter | Pore length |
|---|---|---|
| 65 nm | 25 nm – 40 nm | 50 µm oder 100 µm |
| 125 nm | 40 nm – 85 nm | 50 µm oder 100 µm |
| 480 nm | 180 nm – 350 nm | 50 µm oder 100 µm |
Material Properties
Pore diameter
Adjustable from 25 nm to 350 nm
Interpore distance (fixed)
65 nm, 125 nm, or 480 nm
Standard deviation
< 10%
Flow-through membranes
With symmetric pores
Porous templates
With one-sided closed pores (on aluminum substrate)
Pore depth
From 200 nm (template) up to 130 µm
Porosity
Adjustable from 10%
Thermal stability
Up to 1000 °C (depending on the environment)
Chemical stability
Chemically inert in most solvents; not resistant to strong acids or strong bases
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FlexiPor
FlexiPor is a product line of nanoporous aluminum oxide featuring an asymmetric pore structure with two functionally different membrane surfaces. The top side exhibits larger pore diameters that remain constant along the entire pore length, enabling high flow rates. The bottom side defines the effective filtration cut-off through smaller pore openings that can be precisely adjusted depending on the specification.
This geometry enables precise filtration with a defined separation threshold while ensuring high reproducibility. Owing to its high pore density and high porosity, FlexiPor is particularly suited for applications requiring flexible yet controlled separation.
FlexiPor membranes are hydrophilic, compatible with a wide range of solvents, and manufactured without additives, minimizing sample contamination. Their low protein adsorption and near transparency in wet conditions allow direct microscopic analysis without the need for sample transfer.
Typical applications include micro- and nanoplastic filtration and analysis, HPLC mobile phase filtration and degassing, ultra-cleaning of solvents, and use as templates for nanostructure fabrication.
Standardprodukte
| Interpore distance | Pore diameter | Pore length | Pore arrangement |
|---|---|---|---|
| 1,5 µm | 1 µm | 50, 200 µm | trigonal |
| 4,2 µm | 2,5 µm | 50, 200 µm | trigonal |
| 12 µm | 5 µm | 350, 500 µm | square |
| 20 µm | 8 µm | 500 µm | square |
| Filter size | Average pore diameter | Pore length |
|---|---|---|
| 13, 25, 47 mm | 20 nm | 60 µm |
| 13, 25, 47 mm | 100 nm | 60 µm |
| 13, 25, 47 mm | 200 nm | 60 µm |
Material Properties
Pore diameter
Adjustable from 20 nm to 200 nm
Standard deviation
< 25%
Flow-through membranes
With asymmetric pores
Porous templates
With one-sided closed pores (on aluminum substrate)
Pore depth
Customizable from 30 µm to 80 µm (standard 60 µm)
Thermal stability
Up to 1000 °C (depending on the environment)
Chemical stability
Chemically inert in most solvents; not resistant to strong acids or strong bases
funktionalisierbare Oberfläche
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MakroPor
Die MakroPor Membranen besitzen Poren mit einem einheitlichen Porendurchmesser (Abweichung unter 5%), der über die gesamte Porenlänge hindurch konstant bleibt. Die Poren sind aufgrund der Vorstrukturierung über die gesamte Fläche des Wafers gleichmäßig exakt hexagonal oder quadratisch angeordnet. Durch eine zusätzliche anisotrope Ätzung können die runden Poren auch zu viereckigen aufgeweitet werden.
Standardprodukte
| Interpore distance | Pore diameter | Pore length | Pore arrangement |
|---|---|---|---|
| 1,5 µm | 1 µm | 50, 200 µm | trigonal |
| 4,2 µm | 2,5 µm | 50, 200 µm | trigonal |
| 12 µm | 5 µm | 350, 500 µm | square |
| 20 µm | 8 µm | 500 µm | square |
Material­eigenschaften
Porendurchmesser anpassbar ab 1 µm bis 17 µm(größer möglich)
Porenabstand und Anordnung der Poren anpassbar durch Anfertigung einer Photomaske zur Vorstrukturierung
Standardabweichung < 5%
Durchflussmembranen mit symmetrischen Poren
Poröses Silizium mit einseitig geschlossenen Poren
Porentiefen von wenigen µm bis 500 µm
Porosität einstellbar ab 20%
thermisch stabil bis 1200ºC
(abhängig von der Umgebung)
funktionalisierbare Oberfläche
Porendurchmesser
anpassbar ab 1 µm bis 17 µm (größer möglich)
Porenabstand und Anordnung der Poren
anpassbar durch Anfertigung einer Photomaske zur Vorstrukturierung
Standardabweichung
< 5%
Durchflussmembranen
With symmetric pores
Porous silicon
With one-sided closed pores
Pore depth
wenige µm bis 500 µm
Porosity
Adjustable from 20%
Thermal stability
Up to 1200 °C (depending on the environment)