Foam Colorimetric Sensing for Localized Surface Contamination Detection
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Solution Overview
Problem
Existing methods for detecting toxic compounds on surfaces, such as organophosphate compounds, are not precise, do not allow localized detection, and cannot discriminate between different compounds, especially when applied to vertical surfaces, and generate excessive liquid waste.
Innovation Solution
A colorimetric detection device in the form of a foam with encapsulated colored indicators in solid particles, which allows for precise and rapid detection and discrimination of chemical compounds by minimizing indicator interaction and ensuring prolonged contact on various surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If an aqueous solution with colored indicators is sprayed onto the surface, then the detection coverage is increased, but the detection precision and localization capability deteriorate
Solution Approach 1:
The colored indicators are segmented into separate solid particles, with each particle containing only one colored indicator. This segmentation prevents interaction between different colored indicators and enables precise localization of contamination points through distinct color changes at specific locations while maintaining broad surface coverage
Solution Approach 2:
Each solid particle is given the local quality of containing a specific colored indicator that responds to particular chemical compounds. This allows different regions of the foam to exhibit different color changes based on local chemical composition, enabling both broad coverage and precise localization
2Adaptability or versatility
If multiple colored indicators are used in the aqueous solution, then the discrimination capability is improved, but the interaction between indicators increases
Solution Approach 1:
Multiple colored indicators are segmented into separate solid particles, physically isolating them from each other. This prevents harmful interactions between indicators while maintaining the ability to discriminate between different chemical compounds through their distinct color responses
Solution Approach 2:
The solid particle acts as an intermediary carrier that contains and protects the colored indicator from interacting with other indicators in the solution. The particle matrix serves as a barrier that allows the indicator to respond to chemical compounds while preventing cross-interaction between different indicator types
3Ease of operation
If the aqueous solution is applied to vertical surfaces, then the detection capability is provided, but the contact duration is reduced
Solution Approach 1:
The detection solution is transformed from a liquid spray into a foam structure. The foam phase provides better adhesion to vertical surfaces compared to liquid, extending the contact duration while maintaining the detection capability. The gas bubbles dispersed in the liquid phase create a stable foam that remains in place longer on vertical surfaces
Solution Approach 2:
The detection device uses a composite foam structure combining gas bubbles and liquid phase containing solid particles. This composite material provides both the detection functionality of the colored indicators and the extended contact duration of foam on vertical surfaces
4Reliability
If the entire surface is probed to locate contamination points, then the detection completeness is improved, but the operation time and exposure time increase
Solution Approach 1:
The foam contains colored indicators that undergo visible color changes when they come into contact with chemical compounds. This allows operators to quickly scan the surface and immediately identify contamination points through color changes, eliminating the need for systematic probing of the entire surface while maintaining detection completeness
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 rapid, precise, and localized detection of chemical compounds with minimal waste generation, suitable for vertical and complex surfaces, and facilitates efficient decontamination by visualizing contamination areas.
Implementation Method 1
the foam(s) slide slowly by gravity but stay on these surfaces long enough to allow the coloured indicator(s) to react
Implementation Method 2
the coloured indicator or each of the coloured indicators reacts to the chemical compound(s) with which it comes into contact, by changing colour in a characteristic manner
Data Source
Figure 1
AI summary
The invention relates to a colorimetric detection device for detecting the presence of at least one chemical compound (3), which is in the form of a foam (5) and consists of a dispersion of gas bubbles in a foaming aqueous solution comprising one or more different colored indicators, characterized in that the colored indicator or each of the colored indicators is encapsulated in solid particles, and in that each solid particle comprises only one colored indicator when the foaming aqueous solution comprises several colored indicators. The invention also relates to a method for preparing the device as described above. It also relates to a method for detecting the presence of at least one chemical compound by implementing said device. Applications: colorimetric detection of chemical compounds, toxic chemical warfare agents, or toxic industrial chemical compounds.