Microchannel Hydrophobic Coating for Stable Mesh Nebulizer Flow
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Solution Overview
Problem
Existing surface treatments for fluidic channels, particularly in mesh nebulizers, fail to maintain consistent surface energy over time due to reactivity with fluids and environmental factors, leading to impaired fluid flow and potential deposition issues.
Innovation Solution
A surface-treated fluidic channel with a metal surface layer and a hydrophobic coating layer comprising an organo-silicon or self-assembled monolayer of organophosphorus acid, applied directly or through an intermediate organometallic coating, which is resistant to environmental attacks and maintains surface energy consistency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional hydrophobic coatings are applied to fluidic channels, then fluid flow is improved by reducing surface adhesion, but the coating thickness impedes flow in microchannels
Solution Approach 1:
The patent applies an ultrathin hydrophobic coating layer (nanometer to sub-nanometer scale) to the interior surface of the fluidic channel. This thin film approach provides the necessary hydrophobic effect to reduce fluid adhesion and improve flow while being thin enough not to impede flow in microchannels. The coating is deposited as a controlled thin layer that maintains channel dimensions.
Solution Approach 2:
The patent changes the surface energy parameters of the channel wall by applying a hydrophobic coating, transforming the surface from hydrophilic to hydrophobic. This parameter change reduces the surface adhesion force between the fluid and channel wall, improving fluid flow characteristics without requiring thickness changes.
2Reliability
If hydrophobic coatings are applied to repel fluids, then surface energy is reduced for improved flow, but the coatings hydrolyze and increase in surface energy over time
Solution Approach 1:
The patent uses a composite coating structure consisting of multiple layers: a base coating layer and an overlying hydrophobic coating layer. This composite structure combines the adhesion properties of the base layer with the hydrophobic properties of the top layer, creating a stable and durable surface treatment that maintains consistent surface energy over time.
Solution Approach 2:
The patent introduces an intermediate base coating layer that acts as a mediator between the metal substrate and the hydrophobic coating. This intermediate layer provides chemical stability and prevents direct interaction between the hydrophobic coating and the substrate, reducing hydrolysis and maintaining surface energy consistency throughout the service life.
3Ease of manufacture
If metal surfaces are used for fluidic channels, then manufacturing is simplified, but unbound electrons and polar molecules cause reactivity and deposit formation
Solution Approach 1:
The patent introduces a coating layer as an intermediary between the metal substrate and the fluid. This coating layer acts as a barrier that prevents direct contact between the reactive metal surface (with unbound electrons and polar molecules) and the fluid, eliminating reactivity and deposit formation while allowing the metal substrate to retain its manufacturing advantages.
Solution Approach 2:
The patent applies a thin protective coating that sacrificially protects the metal substrate from reactivity. The coating is designed to be stable and resistant to degradation, providing long-term protection against harmful surface reactions while allowing the use of inexpensive, easily manufacturable metal substrates.
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 solution ensures consistent fluid flow and resistance to contamination, maintaining surface energy and operational efficiency throughout the service life of the mesh nebulizer by preventing adsorption of surfactants and other compounds.
Implementation Method 1
a hydrophobic coating layer comprising an organo-silicon or a self-assembled monolayer of an organophosphorus acid
Implementation Method 2
resistant to environmental attacks and maintains surface energy consistency... by preventing adsorption of surfactants and other compounds
Implementation Method 3
a hydrophobic coating layer comprising an organo-silicon or a self-assembled monolayer of an organophosphorus acid... resistant to environmental attacks
Data Source
AI summary
A surface-treated fluidic channel is provided comprising a dispensing device that comprises a microarray of microchannels. The fluidic channel is made from metal and comprises a surface and a hydrophobic coating layer comprising a self-assembled monolayer of an organophosphorus acid adhered to the surface. A mesh nebulizer comprising a reservoir and a dispensing device comprising a microarray of microchannels is also provided. A metal surface layer is applied to the interior and exterior surfaces of the reservoir and dispensing device, and a hydrophobic coating layer comprising an organo-silicon or a self-assembled monolayer of an organophosphorus acid is adhered to the metal surface layer, usually on the exterior surfaces of the reservoir and dispensing device. A hydrophilic polymeric coating layer may be chemically bonded to and propagated from terminal functional groups on the hydrophobic coating layer on the interior surfaces of the reservoir and dispensing device.