Metal Nanoparticle Thermal Biosensors and Asymmetric Filtration
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Solution Overview
Problem
Existing biosensors are bulky, expensive, and lack portability due to reliance on optical excitation and detection methods, making them unsuitable for efficient detection of bio-species at sub-femtomolar concentrations and size-selective filtration.
Innovation Solution
The use of metal and semiconductor nanocrystals to increase the thermal mass of microsensors, allowing for electrical detection of biosensing events through measurable temperature changes, and the development of asymmetric nanofilters for size-selective separation and purification of particles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If optical excitation and fluorescence detection methods are used, then detection sensitivity is improved, but device complexity and cost increase
Solution Approach 1:
The patent replaces the optical detection system with a thermal detection system. Instead of using optical excitation and fluorescence emission, the invention uses thermal mass changes of nanoparticles bound to the sensor surface to detect biosensing events. This substitution eliminates the need for bulky optical components while maintaining detection sensitivity through thermal mass measurements.
Solution Approach 2:
The invention changes the detection parameter from optical properties (fluorescence emission) to thermal properties (thermal mass). By measuring temperature changes and thermal conductivity variations caused by bound nanoparticles, the system achieves sensitive detection without requiring complex optical excitation and detection equipment.
2Measurement precision
If optical excitation and fluorescence detection methods are used, then detection sensitivity is improved, but portability deteriorates
Solution Approach 1:
The patent replaces the optical detection system with a thermal detection system. Instead of using optical excitation and fluorescence emission, the invention uses thermal mass changes of nanoparticles bound to the sensor surface to detect biosensing events. This substitution eliminates the need for bulky optical components while maintaining detection sensitivity through thermal mass measurements.
3Ease of manufacture
If symmetric nanofilter is used, then manufacturing simplicity is improved, but filtration selectivity deteriorates
Solution Approach 1:
The patent applies asymmetry to the nanofilter structure, creating an asymmetric nanofilter with different pore size distributions on opposite sides. This asymmetric design enables size-selective filtration by allowing particles of specific sizes to pass through while blocking others, achieving high filtration selectivity that cannot be obtained with symmetric filters.
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 sub-femtomolar concentration detection of bio-species without optical detection setups and achieves size-selective filtration, enhancing the sensitivity and portability of biosensors while reducing costs.
Implementation Method 1
the use of metal and semiconductor nanocrystals to increase the thermal mass of microsensors, allowing for electrical detection of biosensing events through measurable temperature changes
Implementation Method 2
based on thermal detectors or thin film thermoresistor type detectors in which a known amount of heat is used to change the resistivity of a thermoresistor sensor
Data Source
AI summary
This disclosure provides methods to use nanoparticles as non-optical tags for detecting a change in mass. chemical sensing or bio-sensing events or reaction upon conjugation of nanoparticles onto a thermoresistor heat sensor. Particularly described is the use of metal nanoparticles in thermal sensors, thermal bio-sensors, and sensing pixel arrays for multiple analyte sensing. In addition, an asymmetric filter is disclosed that allows size separation of molecules from nanoparticles. The asymmetric filter is a porous membrane that is designed to have a small pore size in one size and a large pore size on the other side.