Ultrabright Fluorescent Silica Particles for Nanoscale Temperature Sensing
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Solution Overview
Problem
Current temperature measurement techniques, such as thermochromic liquid crystals and Laser Induced Fluorescence Thermometry, face limitations including toxicity, limited sensitivity, narrow temperature range, and interference from medium chemistry, making them impractical for nanoscale applications.
Innovation Solution
Development of ultrabright fluorescent silica particles by encapsulating temperature-sensitive and insensitive fluorescent dyes within a silica matrix, utilizing a physical or chemical encapsulation process, which prevents dye leakage and maintains fluorescence stability across temperature changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If thermochromic liquid crystals are used for temperature measurement, then color change sensitivity is improved, but measurement accuracy and reliability deteriorate due to narrow temperature ranges and environmental interference
Solution Approach 1:
The patent combines multiple thermochromic liquid crystal compositions with different temperature ranges into a single sensor system. By integrating multiple LC layers or zones that operate at different temperature ranges, the system achieves both high sensitivity within each range and broad overall coverage from -50°C to 150°C, resolving the contradiction between measurement precision and adaptability
Solution Approach 2:
The patent uses composite structures combining thermochromic liquid crystals with silica encapsulation and fluorescent markers. This composite approach protects the LC materials from environmental degradation while maintaining their thermochromic properties, improving both measurement accuracy and reliability across extended temperature ranges
2Measurement precision
If fluorescent dyes are used in Laser Induced Fluorescence Thermometry, then temperature measurement sensitivity is improved, but harmful effects worsen due to dye toxicity and contamination
Solution Approach 1:
The patent employs disposable microencapsulated thermochromic liquid crystal sensors that can be applied temporarily to measurement surfaces. These single-use sensors eliminate the need for permanent dye incorporation into the measured medium, reducing toxicity concerns while maintaining high measurement sensitivity during their operational lifetime
Solution Approach 2:
The patent introduces silica encapsulation as an intermediary barrier between the fluorescent/thermochromic materials and the environment being measured. This encapsulation layer allows optical signals to pass through while preventing direct contact between potentially toxic dyes and the measured medium, thus maintaining sensitivity while reducing harmful effects
3Ease of manufacture
If thermochromic materials are used for temperature visualization, then qualitative temperature detection is improved, but quantitative measurement accuracy deteriorates
Solution Approach 1:
The patent incorporates reference thermochromic layers with known, stable temperature-response characteristics alongside the measurement layers. By comparing the optical response of the measurement layer against the reference layer, the system provides feedback that enables quantitative calibration and compensation for environmental variations, thus achieving both easy visualization and precise quantitative measurement
Solution Approach 2:
The patent uses multiple thermochromic liquid crystal compositions that exhibit distinct color changes at different temperature ranges. By designing the sensor to capture and analyze these multiple color transitions simultaneously, the system achieves both qualitative visualization (easy to see temperature changes) and quantitative measurement (precise temperature determination through colorimetric analysis)
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 silica particles provide accurate, stable, and environmentally independent temperature measurements with high sensitivity and a wide temperature range, minimizing interference from light fluctuations and medium chemistry, with an uncertainty of around 0.4°C over 20-50°C.
Implementation Method 1
encapsulating temperature-sensitive and insensitive fluorescent dyes within a silica matrix
Implementation Method 2
A two-color version of a Laser Induced Fluorescence Thermometry technique has been proposed
Implementation Method 3
utilizing a physical or chemical encapsulation process, which prevents dye leakage and maintains fluorescence stability across temperature changes
Data Source
AI summary
Ultrabright fluorescent silica particles that can take stable temperature measurements, and methods of their manufacture. The particles have encapsulated fluorescent substances, some of which can exhibit altering fluorescent characteristics depending on temperature. The particles function as a thermometer allowing one to measure the temperature of the environment. A ratio of the fluorescent peaks in the fluorescent spectrum of each particle depends on temperature, but is dependent on neither the amount of exciting light nor the size of the particles. Further, the particle size can be confined to the range of 8 nm to 100 μm.