Flexible Antimicrobial Glass Composition to Prevent Silver Ion Reduction
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Solution Overview
Problem
Silver-loaded flexible glass is prone to silver particle agglomeration due to redox reactions, leading to coloration and reduced transmittance, compromising its antimicrobial performance.
Innovation Solution
Incorporating cobalt nitrate hexahydrate (Co(NO3)2.6H2O) into the glass formulation forms a stable silver-cobalt alloy, enhancing the chemical stability of silver ions and preventing their reduction to elemental silver.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If silver ions are loaded into flexible glass to provide antimicrobial effects, then antimicrobial performance is improved, but silver ions undergo redox reactions to form silver particle agglomerates causing coloration and reduced transmittance
Solution Approach 1:
Cobalt ions serve as an intermediary substance that mediates between silver ions and the glass matrix. The cobalt ions form stable complexes with silver ions, preventing direct redox reactions while maintaining the antimicrobial properties. This intermediary approach allows silver ions to be stabilized without forming harmful agglomerates.
Solution Approach 2:
The patent creates a composite material system containing both cobalt ions and silver ions within the glass matrix. This composite structure leverages the stable complex formation capability of cobalt to stabilize silver ions, achieving both chemical stability and antimicrobial activity in a single integrated material.
2Stability of the object's composition
If conventional stabilizers like Na2S and Al2O3 are added to form stable silver complexes, then silver ion stability is improved, but the structural stability of the complexes is weak leading to continued reduction of silver ions
Solution Approach 1:
The patent changes the chemical parameters of the stabilizing agent by using cobalt ions instead of conventional Na2S or Al2O3. This parameter change results in forming stronger, more stable complexes with silver ions, as evidenced by the improved inhibition of silver ion reduction and enhanced chemical stability within the glass matrix.
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 maintains high transmittance and antimicrobial activity by stabilizing silver ions, ensuring the glass remains transparent and effective against bacteria.
Implementation Method 1
cobalt nitrate hexahydrate and silver oxide form a silver-cobalt alloy in the glass melting process
Implementation Method 2
makes it difficult for silver ions to be reduced into elemental silver
Data Source
AI summary
A flexible antimicrobial glass capable of effectively inhibiting the reduction of silver ions includes the following components in percentages by mass: 55-65% of SiO2, 16-25% of Al2O3, 5-12% of Na2O, 0.5-4% of K2O, 2-8% of MgO, 0-1% of CaO, 0-2% of ZiO2, 0.1-1% of Ag2O, 0.2-3.55% of CoO, and 0-0.5% of Na2S. The above constituting raw materials compose a batch, and the batch is melted and molded. The flexible antimicrobial glass can perfectly inhibit the reduction of silver ions into elemental silver, such that the yellowing of the glass is effectively controlled; it has antimicrobial performance, and the strength and toughness of the glass are prevented from damage because the flexible glass is thin. The glass has an antimicrobial activity grade of grade II, with the antimicrobial R being greater than or equal to 3, and has visible light transmittance at 380-780 nm of greater than or equal to 91%.