Micellar Coumarin Fluoride Sensing for Ultra-Low Aqueous Detection

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Solution Overview

Problem

Conventional methods struggle to accurately measure ultra-low range fluoride concentrations due to high detection limits and interference from solvent systems, leading to inaccurate results in semiconductor manufacturing.

Innovation Solution

A silane-fluorophore complex indicator with a double silicon-oxygen-carbon bridge is used within micelles formed by cationic surfactants, allowing for precise fluorescence-based measurement of fluoride in aqueous samples by quenching the fluorescent signal in the presence of fluoride.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If conventional measurement methods are used, then the measurement process is simple, but the detection limit is high and interference from solvent systems occurs

Engineering Contradiction:

Improvedetection limitVSAvoidmeasurement system complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent introduces an intermediary indicator compound that selectively interacts with fluoride ions. This indicator acts as a mediator between the fluoride analyte and the detection system, enabling sensitive detection through fluorescence quenching while maintaining measurement simplicity. The indicator compound facilitates the interaction without requiring complex measurement apparatus.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent replaces conventional mechanical or electrical detection methods with optical fluorescence-based detection. By substituting the detection mechanism to rely on fluorescence quenching rather than complex instrumental analysis, the system achieves ultra-low detection limits while maintaining relative simplicity in the measurement process.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Measurement precision

If solvent systems are used in conventional methods, then the measurement process is straightforward, but interference occurs leading to inaccurate results

Engineering Contradiction:

Improvemeasurement accuracyVSAvoidsolvent interference

Core Design Contradiction:

Measurement precisionVSObject-affected harmful factors

Solution Approach 1:

The patent extracts and eliminates the harmful solvent system from the measurement process. By removing the conventional solvent-based approach and replacing it with a water-based or solvent-free indicator system, the method eliminates solvent interference while maintaining measurement accuracy for ultra-low fluoride concentrations.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent converts the potential harm of solvent interference into a benefit by designing an indicator system that is specifically insensitive to solvent effects. The fluorescence-based detection mechanism is engineered to provide accurate readings regardless of solvent presence, turning a potential interference issue into a strength of the measurement system.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Duration of action of stationary object

If conventional indicators are used, then the measurement setup is simple, but the shelf life is reduced and interference increases

Engineering Contradiction:

Improveshelf lifeVSAvoidindicator system complexity

Core Design Contradiction:

Duration of action of stationary objectVSDevice complexity

Solution Approach 1:

The patent modifies the chemical parameters of the indicator system to enhance stability and shelf life. By adjusting the molecular structure and chemical properties of the indicator compound, the system achieves improved durability and resistance to degradation while maintaining measurement simplicity. These parameter changes prevent premature decomposition and extend the operational lifespan.

Inventive Principle:

Principle #35Parameter changes

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 method achieves a detection limit of around 1-5 ppb fluoride with enhanced shelf life and reduced interference, suitable for semiconductor manufacturing applications.

Implementation Method 1

measuring a change in fluorescence in the aqueous sample, wherein the change in fluorescence is responsive to the analyte component interacting with the indicator

Methodology Applied

Scientific EffectFluorescence quenching: Fluorescence

Implementation Method 2

the plurality of micelles is assembled from a cationic surfactant to form an indicator solution

Methodology Applied

Scientific EffectMicelle formation: Surfactant

Data Source

PatentUS20250383290A1Dioxa-silolo coumarin derivatives indicator fluoride measurement

Publication Date: 2025.12.18 HACH

AI summary

An embodiment provides a method for measuring an analyte component of an aqueous sample, including: introducing an indicator solution to the aqueous sample, wherein the indicator solution comprises a plurality of micelles, wherein an indicator is within the micelles and the plurality of micelles is assembled from a cationic surfactant to form an indicator solution, wherein the indicator comprises a double silicon-oxygen-carbon bridge, wherein the assembly occurs in the presence of an amount of alcohol; and measuring an analyte component concentration of the aqueous sample, wherein the measuring comprises measuring a change in fluorescence in the aqueous sample, wherein the change in fluorescence is responsive to the analyte component interacting with the indicator. Other aspects are described and claimed.