Photopolymerization of (meth)acrylate-based formulations has become a widespread method for industry due to the high energy efficiency and low curing times of this technology. Various products from simple coatings to more complex applications such as additive manufacturing technologies are based on this versatile method. Common industrial radical photoinitiators are generally based on aromatic ketones. Benzaldehyde is an organic compound consisting of a benzene ring with a formyl substituent. It is the simplest aromatic aldehyde and one of the most industrially useful; for instance in the preparation of various aniline dyes, perfumes, flavorings, and pharmaceutics. Parallel to this, triphenylamines are extensively used for the design of dyes used for solar energy conversion. In this work, three triphenylamine derivatives bearing formyl groups are as a new substance class of multi-photon lithography photoinitiators. The photophysical properties of the PIs were investigated by UV−Vis abs
In this work, we report a one-step sputtering method for direct preparation of Cu2O and CuO coatings on different substrates, i.e. glass, thin polymer films and titanium alloy. Interestingly, these coatings possessing micro- and nanostructures exhibiting controlled dual-scale roughness and the wettability investigation reveals that we can tune the wetting properties.
We are presenting a model for a quantitative description of the polymerization process in 3D-laser microfabrication. With aim to assist in estimating the necessary power threshold to obtain certain feature size, particularly the line characteristics, depending on the laser power and writing speed. The focal distribution as well as the photoresist is taken into account. We do not try to gain any chemical insight into the processes involved, and restrict us to a quantitative study of a multi-photon process. Machine learning is used to classify the input SEM images providing a look-up table as a custom field for optimized parameter selection.
Nanoimprint lithography (NIL) is a technique suitable for the mass production of micro-optical elements using a mould. One drawback, however, is that the materials used in NIL have low laser-induced damage threshold (LIDT). Here, we present our results in the development of a series of high-LIDT organic-inorganic hybrid materials, and their application in NIL using moulds made by multiphoton lithography.
Arrays of hierarchical microstructures are considered nowadays as an effective method to create hydrophobic surfaces. Herein, we use femtosecond 3D printing to manufacture microstructures in different geometric patterns. Direct laser writing and, in particular, multiphoton polymerization lithography (MPL) with ultrafast laser pulses has taken additive manufacturing all the way down to the sub-micrometer scale. MPL is a 3D nanoscale manufacturing tool offering great potential for rapid prototyping and the manufacture of photonic devices, tissue scaffolds and biomechanical parts. In this study, we demonstrate the tuning of the wetting performance of surfaces via trichomes designs of 3D microstructures.
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