Platinum Nanoparticle Solution pH Control for Color Stability

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Platinum nanoparticle solutions used in antibacterial agents face issues with time-dependent discoloration due to surfactants or protective agents, leading to reduced functional properties and potential human body impact, and aggregation occurs with increased nanoparticle content, causing defects in applications like staining on white materials.

Innovation Solution

A method involving the addition of a reducing agent to a solution containing platinum ions derived from chloroplatinic acid or a chloroplatinic acid salt, followed by reduction treatment and the use of an inorganic acid to adjust the pH to 4 to 6, preferably with dilute hydrochloric acid, to stabilize the nanoparticles and prevent discoloration.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If a surfactant or protective agent is added to maintain nanoparticle dispersibility, then aggregation is suppressed, but adsorbing ability and functional properties deteriorate

Engineering Contradiction:

ImprovedispersibilityVSAvoidfunctional properties

Core Design Contradiction:

Stability of the object's compositionVSReliability

Solution Approach 1:

The patent removes surfactants and protective agents from the nanoparticle solution formulation. By extracting these problematic components, the invention eliminates their negative impact on adsorbing ability while maintaining nanoparticle stability through alternative means (controlled pH and ionic strength).

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent changes the chemical parameters of the solution by adjusting pH to acidic conditions (pH 2-4) and controlling ionic strength. This parameter modification allows the nanoparticles to maintain stability without requiring surfactants, as the electrostatic repulsion and surface charge effects at low pH provide sufficient stabilization.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If platinum nanoparticle content is increased to enhance antibacterial function, then functional effects improve, but aggregation and precipitation occur

Engineering Contradiction:

Improveantibacterial functionVSAvoidstability

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The patent modifies solution parameters (pH, ionic strength, temperature) to enable higher nanoparticle concentrations without aggregation. By controlling pH in the acidic range and managing ionic strength, the invention allows increased platinum content while maintaining colloidal stability through enhanced electrostatic repulsion between particles.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If nanoparticle content is increased to improve functional effects, then antibacterial activity enhances, but time-dependent discoloration occurs

Engineering Contradiction:

Improveantibacterial activityVSAvoidcolor stability

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The patent changes the chemical environment by maintaining acidic pH and controlled ionic strength, which prevents oxidation and aggregation that cause discoloration. These parameter controls allow high nanoparticle concentrations to be maintained without the time-dependent color changes that would otherwise occur.

Inventive Principle:

Principle #35Parameter changes

4Stability of the object's composition

If surfactants or protective agents are used to prevent aggregation, then nanoparticle stability improves, but safety for human bodies deteriorates

Engineering Contradiction:

ImprovestabilityVSAvoidsafety

Core Design Contradiction:

Stability of the object's compositionVSObject-affected harmful factors

Solution Approach 1:

The patent eliminates surfactants and protective agents from the formulation, removing the harmful components while maintaining nanoparticle stability through physical chemistry controls (pH, ionic strength, surface charge effects). This extraction approach ensures safety while preserving stability.

Inventive Principle:

Principle #2Taking out (Extraction)

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 that resists time-dependent discoloration, maintaining functional properties and stability, enabling the production of antibacterial agents with enhanced storage stability and effective antibacterial action.

Implementation Method 1

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

Methodology Applied

Scientific EffectReduction: Reduction

Implementation Method 2

adding an inorganic acid... with dilute hydrochloric acid, to stabilize the nanoparticles and prevent discoloration

Methodology Applied

Scientific EffectpH adjustment:

Data Source

PatentUS20260068889A1Method for producing platinum nano-particle solution, antibacterial agent, and antibacterial product

Publication Date: 2026.03.12 CEP PROJECT CO LTD

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.