Theses
< 2017>
2017-02-14
ADAM VALLÉS
2017-03-24
CLAUS LINDNER
2017-05-11
ACHIM WOESSNER
2017-09-07
PAU MESTRES
2017-10-06
IVAN NIKITSKIY
2017-10-19
MARCO MANZONI
2017-10-23
KUTLU KUTLUER

Self-Cleaning Optical Surfaces for the Inkjet and 3d Printing Industry



MEHMET ALICAN NOYAN
June 23rd, 2017 MEHMET ALICAN NOYAN Optoelectronics
ICFO-The Institute of Photonic Sciences


Liquid and solid repellent surfaces are key to many industries. For example, construction industry benefits from self-cleaning windows, cements, paints, roof tiles, and corrosion resistant surfaces, while easy-to-clean, antifingerprint and antibacterial surfaces are highly relevant for display applications.

In inkjet and 3D printers, the unwanted deposition on the inner parts of raw materials in the form of liquid, aerosol or solid particulates may cause device malfunctioning. In particular, ink aerosol and powder may obstruct light passage in several key components, such as sensors and lamps. To address this, the thesis proposes and investigates novel designs and methods to reduce ink aerosol and powder contamination on transparent surfaces.

In the first part, Joule heating and hydrophobicity against ink aerosol contamination are studied. The former effect is provided by a transparent conducting film (TCF), while the latter through a self-assembled monolayer (SAM) coating. The combination of the two effects reduce transmittance loss from an average of 10% to less than 1.5% in the presence of ink aerosol. Correspondingly, the area of the surface covered by ink decreases from around 45% to less than 2%. Results obtained with the glass substrates are subsequently extended to the plastic window of a commercial inkjet printer calibration sensor. Furthermore, effectiveness of the proposed self-cleaning surfaces inside an inkjet printer is demonstrated.

In the second part, a technology called “electric curtain” is used to design a self-cleaning surface against powder contamination in 3D printers. Powders are the starting material for forming the objects and are largely present inside the printer. It is shown that an electric curtain can clean about 50% of the powder that deposits on the surface . The thesis also proposes a new electric curtain design consisting of a double electrode layer which significantly increases the particle removal efficacy to more than 70%, with plenty of margin of improvement.

In summary, in this thesis novel self-cleaning transparent surfaces are proposed and their potential for inkjet and 3D printing industry is demonstrated in real operating conditions.


Friday, June 23 , 11:00. ICFO Auditorium

Thesis Director: Prof . Dr. Valerio Pruneri