Speaker
Description
Organosilanes are well known for their application as coupling agents and surface modifiers as used in anti-adhesive coatings, self-cleaning surfaces and separation layers. The wide range of available organosilanes enables a precise adjustment of the properties of the coating to meet individual requirements. Our previous studies demonstrated that perfluorinated organosilanes (based on mono- and dipodal components processed from the liquid phase) are applicable as antiadhesive layers for metallic molds and dies in the field of polymer processing. The control of film thickness as well as monitoring of wear still remains a challenge, especially during technical applications.
In the present study, anti-adhesive organosilane layers were functionalized with the aim to facilitate the detection and control of deposition. Therefore, fluorescent molecules bearing a trialkoxysilyl anchoring group were synthesized. These fluorescent silanes were deposited together with fluoroalkylsilanes of an anti-adhesive formulation in a sol-gel process which is based on hydrolysis and condensation reactions. The incorporation of the fluorescent marker introduces a visibility-on-demand property, and consequently constitutes a rapid and reliable method to prove the deposition and homogeneity of the coating as well as its abrasion during long-term use.
Coated surfaces were investigated with regard to their surface energy by contact angle measurements. Their surface composition was studied with spectroscopic methods such as XPS and FTIR. The optical properties of the fluorescent organosilane layers were investigated, e.g., by means of UV-vis and fluorescence spectroscopy.
Potential applications of these functional surface coatings are highlighted.
| Speaker Country | Austria |
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