UV-C Reactive Ink Composition for Stable Dosimetry
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Solution Overview
Problem
Existing UV-C radiation reactive inks used for sterilization or disinfection processes lack sensitivity and stability, often reverting to their initial color state, making it difficult to accurately monitor UV-C radiation doses and assess disinfection efficiency.
Innovation Solution
A UV-C radiation reactive ink composition comprising a UV-C radiation sensitive polymer, an acid scavenger, a photoinitiator, a pH-sensitive dye, and a radiation screening agent, combined with a solvent and background dye, which is printed onto a substrate in a layered structure to provide enhanced sensitivity and color stability across a range of UV-C radiation doses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If existing UV-C radiation reactive inks are used, then the dosimeter can detect UV-C radiation, but the color changes revert to initial states and sensitivity is difficult to adjust
Solution Approach 1:
The patent adjusts the sensitivity of the dosimeter by modifying the chemical composition parameters of the ink, specifically the ratio of UV-C reactive compound to pH-sensitive dye, and the pH of the buffer solution. This allows precise tuning of the dosimeter's response to different UV-C radiation doses while maintaining stable color changes without reversion to initial states.
Solution Approach 2:
The patent employs a composite ink formulation containing multiple components: UV-C reactive compounds (such as halogenated polymers), pH-sensitive dyes, buffer solutions, and stabilizing agents. This composite material approach enables the dosimeter to achieve both reliable color stability and adjustable sensitivity by optimizing the interactions between different chemical components.
2Measurement precision
If UV-C radiation reactive inks with high sensitivity are used, then the dosimeter can detect low UV-C doses, but the color reverts quickly and stability decreases
Solution Approach 1:
The patent introduces a buffer solution as an intermediary component that mediates between the UV-C reactive compound and the pH-sensitive dye. The buffer maintains a stable pH environment, preventing rapid reversion of the color change while allowing the dosimeter to detect a wide range of UV-C doses. This intermediary mechanism decouples the sensitivity from stability, allowing both to be optimized independently.
Solution Approach 2:
The patent incorporates stabilizing agents and optimized buffer capacities in the ink formulation beforehand to cushion against pH fluctuations that would cause color reversion. This pre-built chemical buffer system ensures that once the color change occurs due to UV-C exposure, it remains stable over time, preventing quick reversion even for highly sensitive dosimeters.
3Reliability
If diluents based on cellulose derivatives are used to attenuate UV radiation sensitivity, then the dosimeter becomes less sensitive to UV radiation, but the manufacturing complexity increases
Solution Approach 1:
The patent controls UV radiation sensitivity by adjusting the concentration and type of diluent in the ink formulation, along with the ratios of other components. By optimizing these chemical parameters, the dosimeter achieves appropriate sensitivity levels without requiring complex manufacturing processes or additional structural elements, maintaining ease of manufacture while controlling UV response.
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 composition provides reliable and stable color changes in response to UV-C radiation, allowing for accurate monitoring of sterilization or disinfection processes, with improved sensitivity and long-term stability, preventing reversion to initial colors and enabling precise assessment of UV-C radiation doses.
Implementation Method 1
an UV-C radiation sensitive polymer... that releases acidic compounds upon exposure to UV-C radiation
Implementation Method 2
a photoinitiator... that triggers the decomposition of the UV-C sensitive polymer
Implementation Method 3
a pH-sensitive dye... that changes color in response to the acidic environment
Implementation Method 4
an acid scavenger... that neutralizes excess acid and stabilizes the pH
Data Source
AI summary
A reactive ink composition comprising a UV-C radiation sensitive polymer, an acid scavenger, a photoinitiator, and a pH-sensitive dye. A method to print a composition onto a UV-C radiation dosimeter using a “layer-by-layer” deposition technique, as well as a dosimeter comprising the reactive ink composition, useful in monitoring the efficiency of a UV-C radiation sterilization or disinfection process.