Fluoride Nanomaterial Preparation via Closed-Loop Solvothermal Process
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Solution Overview
Problem
Current methods for preparing fluoride nanomaterials face challenges such as low yield, high production costs, environmental pollution, and limited scalability due to the use of open production processes and expensive, toxic precursors, which hinder their practical application in fields like biomedicine and optical sensors.
Innovation Solution
An environmentally friendly large-scale preparation method involving the use of oxide, carbonate, or hydroxide raw materials with volatile acids to form water-soluble salts, followed by a decompression process to create oil-soluble precursors, and subsequent heating with an oil-infiltrating fluorine source to produce fluoride nanoparticles, utilizing a closed-loop process to recycle by-products and reduce waste.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If solid-phase sintering method is used to prepare fluoride materials, then production cost is low and large-scale production is suitable, but particle size is large (micron level) and particle size distribution is uneven
Solution Approach 1:
The patent changes the physical and chemical parameters of the reaction system by using solvothermal conditions (temperature, pressure, solvent type) to control nucleation and growth rates, achieving uniform nanoparticle sizes while maintaining scalable production. The reaction temperature (80-180°C) and pressure are optimized to control particle formation kinetics.
Solution Approach 2:
The patent introduces organic solvents (water, alcohol, ether, or their mixtures) as intermediaries to mediate the reaction between metal salts and fluoride sources. These solvents control the dissolution and precipitation processes, enabling uniform nanoparticle formation while allowing for large-scale production through continuous processing.
2Manufacturing precision
If hydrothermal method is used to prepare fluoride nanomaterial, then particle size is small and dispersity is good, but sample yield is extremely low (0.1 g order of magnitude) and equipment cost is very high
Solution Approach 1:
The patent reduces the reaction temperature from ultra-high pressure hydrothermal conditions (>100 atm) to moderate solvothermal conditions (80-180°C, 1-10 atm), dramatically increasing yield while maintaining nanoparticle quality. The pressure is controlled at 1-10 atm instead of ultra-high pressure, enabling standard equipment use.
Solution Approach 2:
The patent replaces expensive, specialized ultra-high pressure hydrothermal equipment with standard autoclaves or反应釜 that can operate at moderate pressures (1-10 atm). This substitution of equipment dramatically reduces capital investment while achieving the desired nanoparticle product through optimized chemical processes.
3Manufacturing precision
If high temperature pyrolysis method is used to prepare fluoride nanomaterial, then crystallinity is high and particle size is small, but reaction temperature is high and sample yield is low (0.1 g order of magnitude)
Solution Approach 1:
The patent changes the temperature parameter from high temperature pyrolysis (>300°C) to moderate solvothermal conditions (80-180°C), where the solvent system and controlled precipitation enable crystal formation without requiring high temperatures. This temperature reduction increases yield while maintaining crystallinity through slow, controlled crystal growth in solution.
Solution Approach 2:
The patent replaces the thermal energy-driven pyrolysis process with a chemically-driven solvothermal process. Instead of relying on high temperature to drive decomposition and crystal formation, the system uses solvent-mediated chemical reactions at lower temperatures to achieve the same crystalline nanoparticle product with higher yield.
4Ease of manufacture
If open production process is used with toxic precursors, then nanomaterial can be prepared, but environmental pollution is serious and production cost is high
Solution Approach 1:
The patent converts potentially harmful toxic precursors into benign aqueous or alcoholic solutions of metal salts and fluoride sources. The reaction system uses environmentally friendly solvents (water, alcohol, ether) that can be easily treated or recycled, transforming a harmful open-process synthesis into a clean, controlled, and environmentally benign process.
Solution Approach 2:
The patent creates an inert, controlled reaction environment using sealed autoclaves or反应釜 with inert or benign solvent atmospheres (water, alcohol, ether). This prevents contamination and eliminates the need for toxic precursors, as the closed system with controlled chemistry achieves the desired nanoparticle product without environmental pollution.
5Ease of manufacture
If methanol is introduced in coprecipitation method to dissolve fluorine source, then fluorine source solubility is improved, but solution volume is increased and sample yield is reduced
Solution Approach 1:
The patent changes the solvent parameter from methanol to water, alcohol, or ether systems that provide adequate solubility for fluoride sources without requiring excessive volumes. The solubility is optimized through pH control, temperature adjustment, and solvent selection, achieving high yield by minimizing the volume of solvent needed while maintaining complete dissolution of reactants.
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 significantly increases yield, reduces production costs by over 75%, and enables large-scale production while minimizing environmental impact by eliminating waste discharge, resulting in uniform nanoparticles without agglomeration.
Implementation Method 1
adding volatile acid a to the raw material; or directly taking volatile acid salt containing M and/or RE as raw material; heating to reflux to dissolve the raw material; and converting the raw material into water-soluble salt
Implementation Method 2
conducting a decompression process on the water-soluble salt solution b in step 1 to evaporate excess volatile acid a and water which do not participate in the reaction
Implementation Method 3
evaporate excess volatile acid a and water which do not participate in the reaction, wherein evaporation temperature is 50-130° C. and relative vacuum is −(0.01-0.09) MPa
Implementation Method 4
adding oil-infiltrating fluorine source e to the oil-soluble salt solution d obtained in step 2; when the product is compound fluoride, adding an oil-infiltrating compound of A, wherein the addition amount of the oil-infiltrating fluorine source e is 90%-120% of the sum of the stoichiometric ratios of A+M+RE; conducting a heating reaction at a temperature not higher than 80° C. to generate nanofluoride
Implementation Method 5
then heating and crystallizing the nanofluoride under the protection of inert gas at heating temperature of 180-330° C. and reaction time of 0.5-5 h
Implementation Method 6
heating and crystallizing the nanofluoride under the protection of inert gas at heating temperature of 180-330° C.
Data Source
AI summary
A closed-loop large-scale preparation method of fluoride nanomaterial is disclosed, comprising the following steps: dissolving initial raw material into water-soluble salt by using volatile acid; evaporating the remaining acid under reduced pressure and recovering; then, adding oily organic matter with high boiling point to continue to evaporate the combined volatile acid under reduced pressure; adding an oil-soluble fluorine source to the generated oil-soluble salt; increasing the reaction temperature to increase the crystallinity of the fluoride; after cooling, separating and recovering the product and the oily organic matter; and repeating the process to realize large-scale preparation. The method uses the closed-loop process flow, does not discharge waste, and has high device yield per unit volume, low production cost and low specified asset investment. The product has the characteristics of uniform particle size and good dispersibility. The method is a user-friendly and environment-friendly large-scale preparation method of the fluoride nanoparticles.