Thermal Bubble Particle Deposition for Sensing
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Solution Overview
Problem
Current methods for depositing particles on substrates for sensing applications are limited by the need for expensive equipment and techniques like vacuum deposition and lithography, which are not suitable for large-scale applications, and traditional thermal bubble deposition can damage heat-sensitive biomolecules, reducing sensing signal strength.
Innovation Solution
The Shrinking Surface Bubble Deposition (SSBD) technique generates a thermal bubble that deposits particles by leveraging the Marangoni flow and surface tension, allowing for precise concentration of particles without continuous laser heating, maintaining the viability of heat-sensitive molecules and enabling efficient deposition of functionalized nanoparticles and analytes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional thermal bubble deposition is used to deposit particles, then particle deposition can be achieved, but heat-sensitive biomolecules are damaged and sensing signal strength is reduced
Solution Approach 1:
The patent employs periodic pulsed laser irradiation instead of continuous heating. The laser is applied in pulses that generate thermal bubbles only during the pulse duration, allowing the bubble to collapse and deposit particles during the off-period when no heating occurs. This periodic action enables particle deposition while avoiding continuous thermal exposure that would damage heat-sensitive biomolecules.
Solution Approach 2:
The patent rapidly generates and collapses thermal bubbles in a time-scale that skips the prolonged heating phase. The laser pulse duration is optimized to create bubbles that form and collapse quickly, depositing particles before significant thermal diffusion can occur. This rushing through the heating process minimizes thermal damage while achieving effective particle deposition.
2Manufacturing precision
If vacuum deposition and lithography techniques are used, then precise particle deposition can be achieved, but expensive equipment is required and large-scale applications are not suitable
Solution Approach 1:
The patent replaces complex mechanical vacuum deposition and lithography systems with a simple optical-based thermal bubble approach. By using laser-induced thermal bubbles in liquid medium, the method achieves precise particle deposition without requiring vacuum chambers, lithography equipment, or complex mechanical systems. This substitution dramatically simplifies the device complexity while maintaining deposition precision.
Solution Approach 2:
The patent changes the deposition environment from vacuum to liquid medium, and from continuous mechanical processes to pulsed thermal processes. By adjusting parameters such as laser pulse duration, power, and liquid medium properties, precise particle deposition is achieved using simple equipment. This parameter change enables large-scale applications without expensive equipment.
3Quantity of substance
If continuous laser heating is applied to generate thermal bubbles, then particle deposition is achieved, but heat-sensitive molecules lose viability
Solution Approach 1:
The patent uses periodic pulsed laser irradiation where the laser is turned on only during brief pulse durations to generate thermal bubbles for particle concentration. Between pulses, the system cools down, allowing biomolecules to recover and maintain viability. This periodic action achieves effective particle concentration while limiting cumulative thermal exposure that would otherwise destroy heat-sensitive molecules.
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
SSBD achieves precise and concentrated particle deposition with enhanced sensing signal strength, compatible with biological applications, and is applicable for detecting various targets including nucleic acids, proteins, and lipids, overcoming the limitations of traditional methods.
Implementation Method 1
irradiating a substrate with a laser to heat the substrate and the medium
Implementation Method 2
generating a thermal bubble on a surface of the substrate in the medium such that the thermal bubble deposits the particles on the substrate
Implementation Method 3
deflating the thermal bubble such that the deposited particles are pulled toward a central position to form an island of particles
Data Source
AI summary
Systems and methods are disclosed for depositing particles on a substrate, the method comprising generating a thermal bubble on a surface of a substrate submerged in a medium having suspended particles such that the thermal bubble deposits the particles on the substrate; and deflating the thermal bubble such that the deposited particles are pulled toward a central position to form an island of particles.