Oxide-Coated Colloidal Silver for Stable Antimicrobial Formulations
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing silver-containing compositions face issues such as discoloration, rheology instability, and oxidation of formulation components due to high concentrations of silver, particularly in the +1 oxidation state, which can lead to undesirable side-reactions.
Innovation Solution
The use of silver particles in the +2 oxidation state, surrounded by a multivalent silver oxide coating, allows for lower concentrations of silver to be effective, providing potent antimicrobial properties while minimizing adverse reactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high concentrations of silver in the +1 oxidation state are used, then antimicrobial efficacy is improved, but discoloration and oxidation of formulation components occur
Solution Approach 1:
The patent changes the oxidation state parameter of silver from +1 to +2, which fundamentally alters the chemical behavior and stability of silver in the formulation. This parameter change enables effective antimicrobial activity at lower concentrations while avoiding the harmful discoloration and oxidation reactions associated with +1 oxidation state silver
Solution Approach 2:
The patent creates a composite structure consisting of silver particles in the +2 oxidation state combined with a multivalent silver oxide coating. This composite material approach provides both the antimicrobial efficacy and the stability needed to prevent discoloration and oxidation of formulation components
2Reliability
If high concentrations of silver are used, then antimicrobial properties are enhanced, but rheology instability occurs
Solution Approach 1:
The patent changes the concentration parameter by using lower silver concentrations made effective through the +2 oxidation state and multivalent silver oxide coating. This parameter change maintains antimicrobial properties while preventing rheology instability that occurs at high silver concentrations
3Reliability
If silver particles are used to provide antimicrobial activity, then product effectiveness is improved, but adverse reactions increase
Solution Approach 1:
The patent changes the oxidation state parameter from +1 to +2, which reduces the reactivity and adverse effects of silver while maintaining antimicrobial activity. The multivalent silver oxide coating further modifies the surface properties to minimize adverse reactions
Solution Approach 2:
The patent uses lower concentrations of silver particles that are effectively neutralized by the multivalent silver oxide coating, reducing the potential for adverse reactions while maintaining sufficient antimicrobial activity for the product's intended use
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
This approach maintains the antimicrobial efficacy of silver formulations without causing discoloration or instability, ensuring a stable and long-lasting product consistency.
Implementation Method 1
a stable and colorless colloidal suspension of silver particles having an interior of metallic silver and an exterior surface of silver oxide
Implementation Method 2
providing potent antimicrobial properties while minimizing adverse reactions
Data Source
AI summary
Colloidal silver particles are incorporated into emulsions and other compositions that find use, for example, as pharmaceutical and dermatological serums, creams, lotions and ointments.