Solid-State Nanopore Formation Without Surface Modification Damage
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Solution Overview
Problem
Existing methods for creating nano-sized apertures in solid-state membranes often destroy chemical surface modifications, leading to clogging of small apertures and instability of lipid bilayers, which are crucial for reliable ion-channel measurements.
Innovation Solution
A process involving dielectric breakdown is used to form apertures in a solid-state membrane after applying a chemical surface modification, allowing the precursor to attach to the internal wall and preserve the modification, enabling the formation of small apertures with a lipid bilayer seal.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If high-energy methods (focussed ion beam, ion beam sculpting) are used to generate apertures, then aperture formation is achieved, but chemical surface modifications are destroyed
Solution Approach 1:
The patent changes the energy parameter from high-energy (focussed ion beam) to low-energy (electron beam) to resolve the contradiction. The electron beam provides sufficient energy to create apertures while being gentle enough to preserve chemical surface modifications, thus achieving both aperture generation and modification preservation simultaneously
2Adaptability or versatility
If chemical surface modification is applied after aperture generation, then surface properties are optimized, but small apertures become clogged
Solution Approach 1:
The patent applies chemical surface modification before aperture generation rather than after. This preliminary action ensures that the surface chemistry is established on the intact membrane, and the subsequent low-energy electron beam aperture creation does not disrupt the modification or cause clogging, thus maintaining both surface optimization and aperture patency
3Ease of manufacture
If high-energy methods are used to create apertures, then aperture formation is achieved, but lipid bilayer stability is compromised
Solution Approach 1:
The patent changes the energy parameter from high-energy (focussed ion beam) to low-energy (electron beam) to protect the lipid bilayer. The electron beam provides just enough energy to create apertures without the aggressive effects that would destabilize the lipid structure, thus achieving aperture formation while maintaining bilayer 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
This method allows for the creation of small apertures with chemical surface modifications that prevent clogging and enhance the stability of lipid bilayers, facilitating reliable ion-channel measurements and hybrid nanopore formation.
Implementation Method 1
forming an aperture through the chemical surface modification and the solid-state membrane
Data Source
AI summary
The invention relates to a process for producing a substrate comprising an aperture, which process comprises providing a substrate which comprises a solid-state membrane and a chemical surface modification on a first surface of the solid-state membrane; and forming an aperture through the chemical surface modification and the solid-state membrane. The invention also relates to a substrate comprising a chemical surface membrane and an aperture, a sensor comprising such a substrate and an apparatus comprising such a substrate.