- After the event
Owner and CEO at SmartMembranes
Monika Lelonek studied chemistry at the Westphalian Wilhelms-University in Muenster. She focused on physical chemistry and started to work on her PhD thesis in the fields on nano porous alumina layers and their behaviour on non-planar surfaces. Additionally she took classes in business administration and economics. During that time she founded the company SmartMembranes with Dr. Petra Goering in the city of Hall after winning the 1st price at the Nano Entrepreneur Academy for that business idea.
As managing partner of the company Monika Lelonek is responsible for the finances and sales. 2014 she was awarded one of 40 most influencing talents under 40 in Germany in the category Economics by the Capital magazine.
Main fields of interest: Nano porous structures and materials, membranes and templates, nano ceramics, innovations and disruptive technologies.
Read more about Monika and her work here.
Abstract Title: “Nano porous alumina structures for innovative seamless R2R printing tools in high-throughput antireflection applications”
Abstract: Nanostructured materials play a key role for the miniaturization and the development of functional devices in the various fields such as microelectronics, optoelectronics, magnetism and sensor applications since they exhibit novel and unique physical, chemical, optical and mechanical properties. Highly ordered nanomaterials have the potential for a tremendous impact on photonic, microfluidic and sensing devices as well as magnetic recording media. Among highly ordered nanomaterials, porous materials have attracted considerable attention, and have become a subject of intense scientific interest. Especially, the research attention has been focused on the electrochemical formation of self ordered nanoporous structures produced by the anodic oxidization. The anodization of aluminium describes one of the most widespread techniques for the fabrication of ordered nanostructures. It is known that electrochemical oxidization of aluminium forms a passivation oxide film on the surface which is called anodic aluminium oxide (AAO).
AAO is a widely studied material that is used for corrosion protection of aluminum surfaces or as dielectric material in microelectronics applications. For more than 40 years porous alumina has been the subject of investigations. It exhibits a homogeneous morphology of parallel pores which grow perpendicular to the surface with a narrow distribution of diameters and interpore spacings, the size of which can easily be controlled between 10 and 400 nm. Monodomain porous alumina templates with very high aspect ratios can also be synthesized by using lithographic preparation. The combination of self-assembly and lithography allows the preparation of porous alumina templates with various configurations of pore arrangement that are not accessible by other state-of-the-art methods. Because of the above mentioned unique properties, nano porous alumina can be used in a wide range of applications, such as nanotubes or nanowires by electrochemical deposition or by using polymer melts.
SmartMembranes has developed new tapered shallow pore structures which imitate nature such as the moth eye or the cicada wing. Antireflection (AR) polymer structures composed of tapered conical pillars were fabricated using highly ordered anodic porous alumina. The shape of the holes in the anodic porous alumina was controlled by performing repeated anodization and pore-widening treatments. By replicating the structure of the anodic porous alumina with PMMA, polymer AR structures were obtained.
The company has set up a pilot line for the anodisation of aluminum cylinders which can be used as printing tools for the structuring of polymers foils or lacquers in a roll to roll process. With this line new developments in R&D projects show results prior to mass production with flexibility to adjust to customers’ needs and parameter change. The application of anodic porous alumina with tapered holes as a mold for nanoimprinting enables the high-throughput fabrication of AR structures of polymers because it can be used repeatedly. The obtained AR structures of polymers can be used in various application fields that need a large sample area, typified by flat panel displays.