Metallic Nanoparticle Synthesis on Clay Supports
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Solution Overview
Problem
Current methods for synthesizing metallic nanoparticles tend to result in clustering, leading to the loss of nanometric properties and high manufacturing costs, making it challenging to achieve industrial-scale production of homogeneously dispersed nanoparticles.
Innovation Solution
A method involving the use of pseudolaminar phyllosilicate clays like sepiolite and atapulgite as supports, where metallic compounds are deposited and reduced under controlled conditions to produce monodispersed nanoparticles with sizes less than 30 nm, maintaining the clay's structural integrity and enhancing surface accessibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional synthesis methods are used to produce metallic nanoparticles, then production quantity can be increased, but nanoparticle clustering occurs and nanometric properties are lost
Solution Approach 1:
The patent introduces a clay support (intermediary material) to which metallic precursors are deposited. This support acts as a mediator that prevents direct nanoparticle-nanoparticle contact and clustering, enabling homogeneous dispersion of nanoparticles across the clay surface while maintaining nanometric properties during industrial-scale production
Solution Approach 2:
The clay support utilizes its porous structure with high surface area to accommodate and disperse metallic nanoparticles. The porous network provides abundant anchoring sites and physical separation, preventing nanoparticle aggregation even at high production quantities while maintaining structural integrity
2Productivity
If conventional synthesis methods are used, then material production can proceed, but manufacturing costs increase due to lack of control and material waste
Solution Approach 1:
The patent applies preliminary action by depositing metallic precursors onto the clay support before reduction. This pre-positioning of precursors on the support surface ensures controlled nanoparticle formation during reduction, preventing uncontrolled aggregation and material waste, thereby reducing manufacturing costs while maintaining high production rates
Solution Approach 2:
The patent utilizes parameter changes by controlling the reduction conditions (temperature, atmosphere, time) to transform precursors into nanoparticles in-situ on the clay support. This controlled transformation parameter set ensures efficient material utilization, minimizes waste, and reduces manufacturing costs compared to conventional methods
3Length of moving object
If nanoparticle size is reduced to maintain nanometric properties, then unique physical properties are preserved, but particles become more prone to clustering
Solution Approach 1:
The clay support serves as an intermediary that physically separates and stabilizes ultrasmall nanoparticles. The support's surface provides anchoring sites that prevent nanoparticle migration and clustering, while the porous structure maintains spatial separation, ensuring stability of ultrasmall particles with sizes between 1-10 nm
Solution Approach 2:
The patent applies local quality by creating specific anchoring sites on the clay support surface where nanoparticles are preferentially formed and stabilized. This localized stabilization mechanism ensures that ultrasmall nanoparticles maintain their size and dispersion uniformity at different locations across the support, preventing clustering while preserving nanometric properties
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 allows for the production of monodispersed metallic nanoparticles with controlled sizes between 10 nm and 5 nm, preventing clustering and maintaining the nanometric properties, thus enabling the creation of cost-effective nanocomposite materials suitable for various applications, including catalysis, optoelectronics, and biocides.
Implementation Method 1
a deposition stage in which the precursor is deposited over the support
Implementation Method 2
when said precursor has been selected from salts and hydroxides, the procedure also entails a thermal decomposition stage in controlled atmosphere in which the precursor is decomposed into the oxide of the metallic element of choice
Implementation Method 3
a reduction stage is carried out in which the oxide of the metallic element is subject to a complete reduction process under controlled partial oxygen pressure (p02) and temperature conditions to finally obtain metallic nanoparticles deposited over the support
Data Source
AI summary
The invention relates to a method of preparing metallic nanoparticles and to the materials thus obtained. More specifically, the invention relates to a method of preparing metallic nanoparticles consisting in: selecting a precursor from the salts, hydroxides and oxides of metallic elements that can be reduced at temperatures below the clay silicate network destruction temperature; and depositing said precursor on a support selected from pseudolaminar phyllosilicate clays. According to the invention the method comprises: (i) a deposition step in which the precursor is deposited on the support: (ii) when the precursor is selected from among salts and hydroxides, a thermal decomposition step in a controlled atmosphere, in which the precursor is subjected to a decomposition process and is transformed into an oxide of the metallic element: and (iii) a reduction step in which the oxide of the metallic element is subjected to a reduction process in a controlled atmosphere. The aforementioned method is performed at temperatures below the clay silicate network destruction temperature.