Functionalized Silicon Nanomembranes for Flow-Through Analyte Detection
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Solution Overview
Problem
Existing analytical techniques face limitations in capturing and detecting analytes due to steric and kinetic constraints, and existing membranes lack optical transparency and permeability, making them unsuitable for point-of-care or lab-on-a-chip applications.
Innovation Solution
The use of functionalized silicon nanomembranes, which are thin, permeable, and optically transparent, allowing for convective flow capture and sensitive detection of analytes through fluidic devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional polymeric membranes (polycarbonate, cellulose, polyethersulfone) are used, then membrane structure is available, but optical transparency and permeability are insufficient
Solution Approach 1:
The patent employs porous silicon membranes with controlled pore structures that simultaneously provide high optical transparency and excellent permeability. The porous structure allows light to pass through while maintaining high flux for analyte transport, resolving the contradiction between optical transparency and permeability that plagues conventional polymeric membranes.
Solution Approach 2:
The invention uses composite structures combining silicon-based materials with functional coatings or modifications. These composite membranes integrate the optical properties of silicon with the functional characteristics needed for both high permeability and transparency, overcoming the limitations of single-material polymeric membranes.
2Productivity
If thick non-polymeric membranes (porous silicon, anodized alumina) are used, then flow-through capability is achieved, but optical transparency decreases and instrumentation complexity increases
Solution Approach 1:
The patent applies local quality by creating regions of different pore sizes and densities within the silicon membrane. The membrane structure is optimized locally to provide high permeability where needed while maintaining overall thinness for optical transparency. This localized optimization allows flow-through capability without requiring thick membranes that would block light.
Solution Approach 2:
The invention changes key parameters including membrane thickness (reducing to nanoscale), pore size distribution, and porosity to achieve both high flow-through capability and optical transparency. By controlling these parameters at the nanoscale, the membrane provides excellent permeability while remaining thin enough for light transmission, eliminating the need for complex instrumentation.
3Reliability
If surface-bound affinity agents are used in non-porous devices, then analyte capture is achieved, but capture efficiency is limited by diffusion and steric constraints
Solution Approach 1:
The patent utilizes the porous structure of silicon membranes to dramatically increase the surface area available for affinity agent binding. The three-dimensional porous network provides extensive internal surface area within a thin profile, allowing much higher density of capture agents and improved analyte capture efficiency beyond what is achievable with flat non-porous surfaces, while maintaining convective flow rather than diffusion-limited transport.
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 silicon nanomembranes enable efficient analyte capture and detection with low complexity instrumentation, overcoming diffusion limitations and enhancing throughput in diagnostic assays.
Implementation Method 1
The analyte binding kinetics within a flow-over fluidic device (i.e., a non-porous device) are diffusion-limited. A flow-through fluidic device may improve the capture of analytes.
Implementation Method 2
Other polymeric membranes (e.g., well-known polycarbonate, cellulose, or polyethersulfone) possess insufficient optical transparency
Data Source
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AI summary
Provided are methods of preparing, detecting, and/or assaying an analyte of interest from a sample. The methods utilize functionalized silicon membranes, such as, for example, functionalized silicon nanomembranes. Samples that can be used in the methods may be biological samples, food samples, environmental samples, industrial samples, or a combination thereof. Also provided are kits to perform methods of the present disclosure.