Silicon Micromechanical Fluid Line Functionalization
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Solution Overview
Problem
Existing methods for surface functionalization, such as silanization, are ineffective for fluid lines with opaque walls, like those made of silicon, as they require direct access and light penetration, which is not possible in closed cavities or micromechanical devices.
Innovation Solution
A method involving the silanization and localized photodeprotection of the internal surface of fluid lines with a silicon layer of specific thickness, using photosensitive silanes and UV light for selective activation, allowing for the grafting of molecules even in opaque-walled devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If photolabile silanes are used for surface functionalization, then selective localization of functionalized areas can be achieved, but the surface must be accessible to insolation which is impossible in closed cavities with opaque walls
Solution Approach 1:
The invention uses a thin silicon layer (10-100 nm) as a transparent membrane that allows UV light to penetrate through it. This thin film approach enables the internal surface to be insolated while maintaining the closed cavity structure, thus resolving the contradiction between surface accessibility for photolabile silane activation and the need for opaque walls in closed cavities.
2Ease of operation
If the silicon layer thickness is reduced to allow light penetration, then internal surface functionalization becomes possible, but the mechanical strength and structural integrity of the device may be compromised
Solution Approach 1:
The invention employs a thin silicon layer (10-100 nm) that is sufficiently transparent to UV light while maintaining adequate mechanical strength through proper substrate integration and device design. This thin film serves as both a structural element and a light-transmitting window for internal surface functionalization.
Solution Approach 2:
The device structure combines the thin silicon layer with other materials (such as substrates, support structures, or composite configurations) to achieve both optical transparency for UV light penetration and sufficient mechanical strength for structural integrity, resolving the contradiction between thinness for light access and strength for durability.
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
Enables the functionalization of fluid lines with opaque walls by selectively activating and deprotecting reactive functions within the silicon layer, enabling the immobilization of probe molecules for detection and hybridization, particularly in micromechanical devices like gravimetric sensors.
Implementation Method 1
a) providing a device whose peripheral wall at least partially comprises a layer of silicon having, at least locally, a thickness of between 100 and 200 nm exclusive... d) localized and selective photodeprotection on at least the internal surface of the silanized device by insolation of the peripheral wall
Implementation Method 2
d) localized and selective photodeprotection on at least the internal surface of the silanized device by insolation of the peripheral wall at the point where it has a thickness of between 100 and 200 nm exclusive
Implementation Method 3
A molecule is then employed which exhibits a silane function which can react with the support made of silicon via the surface silanols and a reactive function
Implementation Method 4
Once the silane is fixed on the surface of the support, the probe molecule is positioned on the silane molecule by the use of complementary reactive functions
Data Source
AI summary
The present invention relates to a method for functionalizing fluid lines (1b) in a micromechanical device, the walls of which include an opaque layer. For this purpose, the invention provides a method for functionalizing a micromechanical device provided with a fluid line including a peripheral wall (5) having a surface (2) outside the line and an inner surface (3) defining a space (1b) in which a fluid can circulate, the peripheral wall at least partially including a silicon layer (5a). The method includes the following steps: a) providing a device, the peripheral wall (5) of which at least partially includes a silicon layer (5a) having, at least locally, a thickness (e) of more than 100 nm and less than 200 nm, advantageously of 160 to 180 nm; c) silanizing at least the inner surface of the fluid line; d) the localized, selective photo-deprotection on at least the inner surface of the silanized device by exposing the peripheral wall (5) at the point at which said wall has a thickness (e) of more than 100 nm and less than 200 nm, advantageously of 160 to 180 nm.