Acid-Stabilized Platinum Nanoparticle Solutions for Antibacterial Use
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Solution Overview
Problem
Platinum nanoparticle solutions used in antibacterial agents face issues with time-dependent discoloration and reduced adsorbing ability due to surfactants or protective agents, leading to functional property deterioration and potential human body impact, while high nanoparticle content leads to aggregation and precipitation.
Innovation Solution
A method involving the addition of a reducing agent to a chloroplatinic acid or chloroplatinic acid salt solution, followed by reduction treatment and adjustment of pH with an inorganic acid, particularly dilute hydrochloric acid, to stabilize platinum nanoparticles and prevent discoloration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a surfactant or protective agent is added to the platinum nanoparticle solution, then the dispersibility and stability of platinum nanoparticles are improved, but the adsorbing ability of platinum nanoparticles is reduced, resulting in deterioration of functional properties such as antibacterial property
Solution Approach 1:
The invention extracts and removes the harmful component (surfactant or protective agent) from the system. By using a breakdown method such as dry grinding or wet grinding to decompose the surfactant, the patent eliminates the substance that causes the contradiction, thereby restoring the adsorbing ability and antibacterial property of platinum nanoparticles while maintaining their dispersibility through alternative means.
Solution Approach 2:
The invention employs strong oxidizing conditions (using hydrogen peroxide and nitric acid) to decompose and remove the surfactant from the platinum nanoparticle solution. This oxidation process breaks down the harmful protective agent that reduces adsorbing ability, while the controlled oxidation conditions preserve the integrity of the platinum nanoparticles themselves.
2Reliability
If the content of platinum nanoparticles is increased in the platinum nanoparticle solution, then the functional properties such as antibacterial property are enhanced, but aggregation and precipitation are likely to occur, resulting in time-dependent discoloration
Solution Approach 1:
The invention applies preliminary protective measures by adding a protective agent (surfactant or polymer compound) before the platinum nanoparticles can aggregate and precipitate. This preventive approach allows the solution to maintain high nanoparticle content without immediate aggregation. Subsequently, the protective agent is decomposed under controlled oxidation conditions, achieving both high initial stability and long-term stability without discoloration.
Solution Approach 2:
The invention performs preliminary stabilization by incorporating the protective agent during the nanoparticle synthesis process, ensuring that high concentrations of platinum nanoparticles remain dispersed and stable from the beginning. This preliminary action prevents aggregation before it can occur, allowing the solution to maintain its functional properties and visual appearance over extended periods.
3Ease of operation
If the platinum nanoparticle solution is used in undiluted form or diluted with water, then the simplicity of application is maintained, but time-dependent discoloration from aggregation and precipitation occurs, leading to defects when applied to white materials
Solution Approach 1:
The invention converts the harmful effect of the protective agent (which causes discoloration when it decomposes over time) into a beneficial temporary stabilizer. The protective agent is intentionally added to prevent aggregation during storage and application, and then deliberately decomposed under controlled oxidation conditions to remove the discoloration source while preserving the nanoparticle dispersion. This transforms a potential harm into a useful temporary protective measure.
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 method produces a platinum nanoparticle solution with enhanced stability and antibacterial properties, resisting time-dependent discoloration and maintaining functionality for extended periods, suitable for various applications including antibacterial agents and products.
Implementation Method 1
a reducing agent is added to a solution containing platinum ions derived from a platinic acid salt or the like, so that the platinum ions are reduced to form platinum nanoparticles
Implementation Method 2
adjustment of pH with an inorganic acid, particularly dilute hydrochloric acid, to stabilize platinum nanoparticles and prevent discoloration
Implementation Method 3
the platinum nanoparticle solution often contains a protective agent such as a surfactant or a polymer compound, which attaches to the surface of the platinum nanoparticles, and acts to suppress aggregation of the platinum nanoparticles
Data Source
Figure 1(a)~2(b)
AI summary
A method for producing a platinum nanoparticle solution, including preparing platinum nanoparticles by adding a reducing agent to a solution containing platinum ions derived from chloroplatinic acid or a chloroplatinic acid salt, to subject the platinum ions to reduction treatment; and adding an inorganic acid. An antibacterial product agent in which a platinum nanoparticle solution containing platinum nanoparticles, an inorganic acid and water is used, and an antibacterial product in which the antibacterial agent is applied.