Antiwetting Coating for Inkjet Nozzle Plates
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Solution Overview
Problem
Existing antiwetting coatings for ink-jet nozzle plates are unstable when exposed to acidic or basic aqueous solutions and often delaminate from substrates, causing ink residue and image quality degradation, and current deposition methods can apply the coating inside the nozzle orifices.
Innovation Solution
A method involving the application of a metal layer, such as noble or coining metals, followed by a thiol layer with a linear alkyl chain, which forms a strong, densely packed monolayer that prevents oxidation and remains stable in acidic and basic solvents, allowing for confined application around nozzle orifices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a physical deposition technique (lamination, spin coating, or CVD) is used to apply antiwetting coating, then good surface properties and chemical stability are achieved, but the coating is unstable to delamination when exposed to liquids
Solution Approach 1:
A metal layer (gold, silver, platinum, or their alloys) is introduced as an intermediary between the silicon substrate and the antiwetting coating. The metal layer serves as a reactive intermediate that forms strong chemical bonds with both the substrate and the coating, enabling stable adhesion in aqueous environments. The metal layer is deposited first, then the antiwetting coating is applied to form a thiol-based monolayer that chemically bonds to the metal surface.
Solution Approach 2:
The invention creates a composite structure consisting of three layers: the silicon substrate, the metal layer (noble or coining metal), and the antiwetting coating layer. This composite structure combines the benefits of each material: the silicon substrate provides the structural base, the metal layer provides chemical reactivity and stability, and the antiwetting coating provides the desired surface properties. The composite structure resolves the adhesion problem by creating multiple strong chemical interfaces.
2Reliability
If chemical vapor deposition or lamination is used to apply antiwetting coating, then excellent chemical stability is obtained, but the coating may be applied inside the nozzle orifices, causing alteration of the printing process
Solution Approach 1:
The method enables localized application of the antiwetting coating only to specific areas where the metal layer is present, such as the outer surfaces of nozzle orifices. The thiol-based coating selectively bonds to the metal layer through chemical interaction, ensuring that the antiwetting property is applied precisely where needed (on the nozzle exterior) and not inside the orifices where it would interfere with ink ejection. This local quality approach maintains manufacturing precision while ensuring chemical stability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method provides a chemically stable antiwetting coating that maintains high antiwetting capability even in aggressive ink environments and prevents delamination, ensuring consistent image quality and easy adaptability to mass-production processes.
Implementation Method 1
forming an antiwetting coating by applying on said metal layer a layer of a thiol of formula R—SH
Implementation Method 2
it is necessary to apply an antiwetting coating (AWC) on the printing nozzle plate to prevent formation of ink residue
Data Source
AI summary
The present disclosure relates to a method for the application of an antiwetting coating on at least one surface of a substrate of semiconductor material comprising the steps of: a) applying on said at least one surface a metal layer of a material chosen in the group constituted by noble metals, coining metals, their oxides and their alloys; and b) applying on said metal layer a layer of a thiol of formula R—SH, where R is a linear alkyl chain having from 3 to 20 carbon atoms and, optionally, at least one hetero-atom, for obtaining an antiwetting coating. The disclosure further regards a method for the production of a nozzle plate for ink-jet printing and to an integrated ink-jet printhead provided with a nozzle plate obtained according to the method of the disclosure.