Core-shell nanoparticles having gold nanoshell, and method for manufacturing said core-shell nanoparticles
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Solution Overview
Problem
Conventional methods for producing core-shell nanoparticles with gold nanoshells face issues of low particle concentration, leading to increased production costs and environmental impact, and insufficient dispersion stability and optical properties due to inadequate protective agents.
Innovation Solution
A method using a higher concentration of gold ions and a reducing agent, such as bicine, combined with a protective agent like partially saponified polyvinyl alcohol, to stabilize and disperse core-shell nanoparticles in aqueous solutions, achieving surface plasmon resonance from red light to near-infrared light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional methods use dilute particle concentration for producing core-shell nanoparticles, then the reaction system is easier to control, but the production cost increases and environmental load increases due to lower yield per lot
Solution Approach 1:
The patent changes the concentration parameter of the reaction system from dilute to high concentration (e.g., gold ion concentration of 1-10 mM). This parameter change enables high-yield production while maintaining reaction control through optimized protective agent selection and reaction conditions, directly resolving the contradiction between ease of manufacture and productivity
2Device complexity
If conventional methods use insufficient protective agents, then the production process is simpler, but the dispersion stability and optical properties of core-shell nanoparticles are inadequate
Solution Approach 1:
The patent employs composite protective agents combining multiple components (e.g., polyvinyl alcohol with molecular weight 10,000-1,000,000 at 0.1-10 wt%, combined with gelatin, casein, or other polymers). This composite approach enhances dispersion stability and optical properties through synergistic effects while maintaining process simplicity, resolving the contradiction between process complexity and reliability
3Productivity
If high concentration of gold ions is used as raw material, then the number of core-shell nanoparticles obtained per lot increases, but the reaction system becomes more difficult to control
Solution Approach 1:
The patent introduces protective agents as intermediaries that mediate between high gold ion concentration and reaction control. These protective agents (e.g., polyvinyl alcohol, gelatin, casein) stabilize the high-concentration reaction system by preventing uncontrolled aggregation and facilitating uniform nucleation, enabling both high productivity and ease of manufacture
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 core-shell nanoparticles with enhanced dispersion stability and optical properties, allowing for higher yields and improved performance in applications like color sensors, biomarkers, and photoelectric conversion materials.
Implementation Method 1
core-shell nanoparticles having gold nanoshells as a coloring agent exhibiting surface plasmon resonance at a predetermined wavelength, particularly from red light to near infrared light
Implementation Method 2
protective agents for dispersing and stabilizing the core-shell nanoparticles
Data Source
AI summary
Provided are core-shell nanoparticles having a gold nanoshell and having high dispersion stability, and a method for manufacturing the core-shell nanoparticles. A method for manufacturing core-shell particles having, on the core particle surface, a gold nanoshell and a protective agent, the manufacturing method including: (a) a step for mixing a solution of core particles and a solution of gold nanoclusters; (b) a step for adding a protective agent and a reducing agent, stirring the components, and adding a gold complex to form a gold nanoshell on the surface of the core particles; and (c) a step for recovering the core-shell particles produced in step (b).