Colored Particulate Materials via Room-Temperature Nanoparticle Germination
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Solution Overview
Problem
Existing methods for coloring materials using preformed metal nanoparticles are complex, require precise control of colloidal suspensions, involve toxic reagents, and are limited to specific substrates, leading to high energy consumption and environmental impact.
Innovation Solution
A method for preparing colored particulate materials through heterogeneous germination at room temperature, using a single-step mixing of metallic salts, reducing agents, and particulate substrates, suitable for a wide range of materials and reducing energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If preformed nanoparticles are used to color materials, then color variety and brightness are improved, but colloidal suspension control complexity and manufacturing difficulty increase
Solution Approach 1:
The substrate surface is pre-treated with silane coupling agents or other surface modifications before nanoparticle deposition, creating predetermined active sites that guide nanoparticle attachment. This preliminary action simplifies subsequent colloidal suspension control by providing defined nucleation points, reducing the complexity of managing nanoparticle distribution and concentration in the suspension.
2Illumination intensity
If preformed nanoparticle concentration is increased to improve coloring intensity, then color intensity improves, but suspension stability and dispersibility worsen
Solution Approach 1:
Surfactants and coupling agents are introduced as intermediary substances that mediate between the nanoparticle surface and the colloidal suspension medium. These intermediaries provide steric or electrostatic stabilization, allowing high nanoparticle concentrations to be maintained while preserving suspension stability and preventing aggregation, thus enabling high coloring intensity without sacrificing suspension stability.
3Productivity
If heterogeneous germination is performed with heat treatment to improve coloring efficiency, then coloring efficiency improves, but energy consumption and process complexity increase
Solution Approach 1:
Thermal energy input is replaced with chemically active species such as plasma-treated surfaces, photo-active groups, or chemically modified substrates that provide the necessary activation energy for nanoparticle germination without requiring heat treatment. This substitution maintains high coloring efficiency by creating highly reactive surface sites while eliminating the energy consumption and infrastructure costs associated with heating systems.
4Manufacturing precision
If complex multi-step processes are used to achieve precise color control, then color precision improves, but manufacturing complexity and time consumption increase
Solution Approach 1:
Precise color control is achieved by modifying substrate surface parameters such as surface energy, charge density, or chemical functionality through single-step treatments like plasma exposure, chemical vapor deposition, or photocatalytic activation. These parameter changes create controlled nucleation environments that direct nanoparticle growth and arrangement, enabling precise color control while avoiding complex multi-step processing sequences.
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 achieves efficient coloring with low energy consumption, broad applicability, and stable color modulation, overcoming the limitations of traditional methods while minimizing environmental impact.
Implementation Method 1
when a metal nanoparticle is subjected to an electromagnetic field whose wavelength is much greater than its size, the free electrons of the conduction band located on the surface of said nanoparticle undergo the same field and oscillate collectively and in phase. When the frequency of the incident wave corresponds to the natural frequency of these oscillations, a resonance phenomenon occurs, called surface plasmon resonance.
Implementation Method 2
Heterogeneous nucleation specifically promotes the nucleation and growth of nanoparticles on the surface of a solid substrate, which acts as a catalyst for the reaction. In this way, the solid substrate in particulate form is colored by the formation of colored nanoparticles on its surface
Implementation Method 3
a method for preparing a colored particulate material by heterogeneous germination comprising the implementation of a single step a) of mixing at room temperature a suspension, said suspension comprising: at least one salt of a metallic element, said metallic element exhibiting a plasmonic effect; at least one reducing agent
Data Source
AI summary
The invention relates to a method for preparing colored materials by heterogeneous germination of metallic nanoparticles, said nanoparticles having optical properties based on the surface plasmon phenomenon. The invention also relates to said colored materials obtained, as well as compositions comprising them. In particular, the method for preparing the colored particulate material by heterogeneous germination, comprises in particular the mixing at room temperature of a suspension comprising: - at least one salt of a metallic element, said metallic element having a plasmonic effect, - at least one reducing agent, and - at least one particulate substrate, said mixture of the suspension forming a colored particulate material.