The main goal of Nadetech is to provide systems for automated nanodeposition processes.
Dip Coating is a process suitable for the production of nanometric thickness films.
The Dip Coating process can be divided into five steps:
In the continuous process, the steps are carried out directly after each other.
Layer-by-Layer Electrostatic Self-Assembly
The Layer-by-Layer Self-Assembly (LbL) method allows the uniform formation of multilayers of nanometric thickness.
The deposition via LbL consists on the alternative immersion of a substrate in different solvents which contains anionic and cationic materials such as polymeric complexes, particles and metallic oxides, fullerenes, proteins, enzymes and other bio-molecules. The films are formed by depositing alternating layers of oppositely charged materials with wash steps in between
The design of these individual precursor molecules and the control of the order at the molecular level of the multilayers along the film thickness allow the control of the macroscopic properties (electrical, optical, magnetical, thermal, mechanical, etc.) so important for the development of the new applications.
The almost perfect order at the molecular level of the individual monolayers is the result of many individual molecules which search the configurations with less energy at local level when they are absorbed from the solutions for bonding with the molecules previously bonded to the surface of the substrate. The interpenetration of the molecules in the adjacent layer could be controlled with the objective to improve the macroscopic properties of the material.
In order to accelerate the deposition process the monolayer deposition process and the wash step of the Layer-by-Layer process can be adjusted.
Instead of developing a multistep immersion of the substrate in different anionic and cationic solutions, these solutions are sprayed using a high pressure sprayer which allows the reduction of waiting time from few minutes to few seconds.
To carry out the deposition task by spraying in an automatic way, it is required the utilization of an electro-pneumatic system which allows controlling the activation and deactivation of every sprayer as well as of a mechanism which provide the movement of the nozzles of the sprayer or the piece to be coated.