Freeze Indicator Using Light Scattering Masking
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Solution Overview
Problem
Existing freeze indicators for monitoring exposure to freezing temperatures often require complex configurations and chemical co-reactants, which can lead to premature color changes and reduced contrast between before and after freezing appearances, making them unsuitable for simple, low-cost applications.
Innovation Solution
A freeze indicator employing an aqueous or hydrophobic liquid medium with dispersed colored indicator agent particles that exhibit a distinct color change upon freezing, utilizing light scattering to mask the inherent color before freezing, and excluding color-changing chemical co-reactants for a simple, cost-effective design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If color-changing chemical co-reactants are used in the indicator dispersion, then the color change signal can be generated, but the device complexity and risk of premature color change increase
Solution Approach 1:
The patent extracts and removes the color-changing chemical co-reactants from the indicator dispersion formulation. Instead of using multiple chemical components that react to produce color change, the invention uses a single colored indicator agent whose inherent color is masked by light scattering particles before freezing and revealed after freezing, thereby simplifying the composition while maintaining reliable color change signaling.
Solution Approach 2:
The patent introduces light scattering particles as an intermediary mechanism to mask the inherent color of the colored indicator agent before freezing. These particles scatter light to hide the color, and upon freezing, the masking effect is lost, revealing the color change signal without requiring chemical co-reactants.
2Ease of manufacture
If the colored indicator agent particles are dispersed in the liquid medium, then the inherent color can be masked before freezing, but the contrast between before and after freezing appearances may be reduced
Solution Approach 1:
The patent utilizes parameter changes in the light scattering properties of the dispersed particles based on temperature. Before freezing, the particles are in a liquid state and scatter light effectively to mask the color. After freezing, the phase change alters the scattering behavior, revealing the inherent color of the indicator agent and providing high contrast for accurate measurement.
3Reliability
If light scattering particles are used to mask the inherent color, then premature coloration is prevented, but the device complexity increases
Solution Approach 1:
The patent employs phase transition of the liquid medium from liquid to solid upon freezing as the triggering mechanism. This phase transition causes the light scattering particles to change their arrangement and scattering properties, automatically revealing the color without requiring additional complex mechanisms or components to prevent premature coloration.
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 solution provides a clear, irreversible color change upon freezing, ensuring effective monitoring of freeze exposure without premature coloration, thus maintaining contrast and simplicity in indicator design.
Implementation Method 1
light scattering masks the inherent color of the colored indicator agent particles before freezing
Implementation Method 2
the indicator dispersion coagulates upon freezing to provide the color change
Data Source
AI summary
A freeze indicator including an indicator dispersion is described herein. Such an indicator dispersion can include: a liquid medium and particles of a colored indicator agent dispersed in the liquid medium. The colored indicator agent particles having an inherent color; wherein the indicator dispersion exhibits the inherent color of the colored indicator agent particles after freezing and is configured to have a less colored appearance before freezing and wherein light scattering masks the inherent color of the colored indicator agent particles before freezing. Some indicator dispersions can be free of color-changing chemical co-reactants. These freeze indicators can be small, have a low cost, and have a simple configuration.