Nanoporous Silicon Dioxide Membranes for Nanoparticle Sorting
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Solution Overview
Problem
Current methods for isolating and studying nanoparticles of nanometer sizes, such as exosomes and DNA, rely on non-specific and physically damaging techniques like centrifugation or chemical binding, lacking effective nanometer-scale filtration options.
Innovation Solution
Development of filters comprising nanopores with diameters of 5 nm or less, formed in silicon dioxide layers on substrates, allowing particles smaller than the pores to pass through while retaining larger ones, and the use of stacked filters with varying pore sizes for size-based separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If centrifugation or chemical binding techniques are used to isolate nanoparticles, then particles can be separated, but the process is non-specific and physically damaging
Solution Approach 1:
The patent employs nanoporous membranes with precisely controlled pore sizes (e.g., 10 nm, 20 nm, 50 nm) that physically exclude particles larger than the pore diameter while allowing smaller particles to pass through. This size-based filtration mechanism provides specific, non-damaging separation without requiring chemical interactions or high-speed centrifugal forces, directly resolving the contradiction between isolation specificity and particle integrity
Solution Approach 2:
The invention changes the separation parameter from chemical affinity or centrifugal force to physical pore size. By varying the pore diameter of the nanoporous membrane, different particle sizes can be selectively isolated. This parameter change enables gentle, specific separation based solely on particle dimensions, avoiding the harmful effects of traditional methods
2Manufacturing precision
If multiple filters with varying pore sizes are stacked to improve sorting precision, then size-based separation is enhanced, but device complexity increases
Solution Approach 1:
The patent divides the sorting function into multiple discrete filter layers, each with a specific pore size (e.g., 10 nm, 20 nm, 50 nm). Particles are sorted sequentially as they pass through each layer, with larger particles being retained at earlier stages and smaller particles progressing to later stages. This segmentation of the sorting process into discrete size-based stages enhances precision while maintaining a relatively simple modular structure that can be assembled from standardized components
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 efficient and non-damaging separation and sorting of nanoparticles by size, applicable beyond biological contexts to industrial and filtration applications, improving the precision and specificity of particle isolation.
Implementation Method 1
each of the nanopores has a diameter of about 5 nm or less... allowing fluid and particles smaller than the nanopores to pass through
Data Source
AI summary
Methods and devices for isolating and sorting nanoparticles are disclosed herein. Nanopores of a desired size can be formed in silicon dioxide membranes and used as filters to separate nanoparticles. Devices are also provided herein for sorting nanoparticles with multiple filters having various sized nanopores.