Metal Phosphate Nanoparticle Synthesis via Supercritical Solvothermal Process
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Solution Overview
Problem
Current methods for synthesizing zinc phosphate nanoparticles lack control over characteristics such as size, crystallinity, and surface functionalization, which are crucial for effective anticorrosion and other applications, and existing solvothermal methods are not compatible with simultaneous surface grafting of organic molecules.
Innovation Solution
A solvothermal method using a continuous flow process at pressures above 5 MPa and temperatures between 100°C to 350°C, allowing for the synthesis of metal phosphate nanoparticles with precise control over composition, phase, hydration state, size, and surface functionalization with organic ligands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional synthesis methods are used to prepare zinc phosphate nanoparticles, then the synthesis process is simple, but the control over characteristics such as size, crystallinity, and surface functionalization is poor
Solution Approach 1:
The patent applies parameter changes by systematically varying synthesis conditions including pH (3-6), temperature (100-350°C), pressure (5-30 MPa), reaction time (1-24 hours), and precursor concentrations to achieve precise control over nanoparticle size (10-100 nm), crystallinity (hopeite phase), and surface functionalization. This resolves the contradiction by demonstrating that controlled parameter variation enables high manufacturing precision without requiring complex additional equipment.
Solution Approach 2:
The patent employs preliminary action through surface functionalization during the synthesis process itself, where organic ligands (carboxylic acids, phosphonic acids, silanes) are introduced in the reaction medium before nanoparticle formation. This allows simultaneous control of size, crystallinity, and surface properties in a single step, achieving high manufacturing precision without complex multi-step processes.
2Manufacturing precision
If solvothermal methods are used for synthesis, then control over nanoparticle characteristics is improved, but simultaneous surface grafting of organic molecules is not compatible
Solution Approach 1:
The patent merges nanoparticle synthesis and surface functionalization into a single integrated solvothermal process. Organic ligands are introduced in the reaction medium before nanoparticle formation, allowing simultaneous crystallization of the hopeite phase and grafting of surface functional groups. This resolves the contradiction by combining two previously separate operations into one versatile process that achieves both precise control over size/crystallinity and surface functionalization.
Solution Approach 2:
The patent creates a universal solvothermal method that can simultaneously produce nanoparticles with controlled size, crystallinity, and surface functionalization using various organic ligands (carboxylic acids, phosphonic acids, silanes, amines). The method is adaptable to different metal phosphates and functionalization requirements, resolving the contradiction by demonstrating multi-functionality in a single process.
3Reliability
If nanoparticles are used for anticorrosion treatment, then penetration into micro-cracks is improved, but control over nanoparticle characteristics is insufficient
Solution Approach 1:
The patent applies parameter changes by optimizing synthesis conditions (pH 3-6, temperature 100-350°C, pressure 5-30 MPa, reaction time 1-24 hours) to produce nanoparticles with specific size (10-100 nm) and crystallinity (hopeite phase) that enable penetration into micro-cracks while maintaining anticorrosion effectiveness. This resolves the contradiction by demonstrating that controlled parameter variation produces nanoparticles with both the required physical characteristics and functional performance.
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 method enables the production of nanoparticles with high purity and controlled characteristics, facilitating their use in industrial-scale applications with enhanced stability and performance in anticorrosion and other fields.
Implementation Method 1
a reaction medium comprising at least: a metal reactant, a phosphate precursor and a solvent, is submitted to a solvothermal treatment at a pressure superior to 5 MPa, and at a temperature of from 100 to 350°C
Implementation Method 2
solvothermal treatment at a pressure superior to 5 MPa, and at a temperature of from 100 to 350°C
Data Source
AI summary
A method for manufacturing metal phosphate hydrate nanoparticles wherein metal reactants are selected from metal precursors of transition metals,phosphate precursors are selected from: Trisodium phosphate Na3PO4, disodium phosphate Na2HPO4, phosphoric acid H3PO4 and hypophosphoric acid H4P2O6, wherein said method comprises the following step of a reaction medium comprising at least a metal reactant, a phosphate precursor and a solvent, is submitted to a solvothermal treatment at a pressure superior to 50 MPa, and at a temperature of from 100 to 350° C.