Recyclable Template Hollow Silica Particles via Depolymerization
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Solution Overview
Problem
Existing template-based methods for producing hollow particles are often destructive, irreversibly changing the core material and preventing its recycling, which limits the efficiency and sustainability of the process.
Innovation Solution
A process is developed to create hollow inorganic particles using a recyclable template approach, where the template material is prepared from an organic monomer, coated with a silica precursor, and then removed through depolymerization, allowing for the recycling of the core material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of substance
If calcination is used to remove the template material, then the core material is removed, but the template material is irreversibly changed and cannot be recycled
Solution Approach 1:
The patent changes the chemical parameters of the template material from traditional organic polymers to metal carbonates (such as CaCO3, MgCO3, BaCO3) that can undergo reversible transformation. These metal carbonate templates can be dissolved in acid to regenerate the original template structure, enabling recycling. The key parameter change is using materials with reversible solubility characteristics rather than irreversible combustion properties.
Solution Approach 2:
The patent implements a recovery system where the template material is not discarded after use but recovered through acid dissolution and precipitation. The metal carbonate template is dissolved in acid to remove the core, then the template can be regenerated from the metal salt solution through controlled precipitation, allowing multiple cycles of template reuse and eliminating waste.
2Loss of substance
If acid dissolution is used to remove acid-labile metal carbonate templates, then the core is removed, but the process generates water-soluble metal salts and CO2
Solution Approach 1:
The patent recovers the metal salts generated during core removal by precipitating the template material from the metal salt solution. Instead of discarding the metal salts as waste, they are converted back into the template material (metal carbonate) through controlled precipitation, which can then be reused as template, transforming waste into a valuable resource.
Solution Approach 2:
The patent converts the harmful waste product (water-soluble metal salts) into a beneficial resource (recyclable template material). The metal salts that were previously considered waste are now the source for regenerating the template, turning a disposal problem into a recycling opportunity.
3Manufacturing precision
If traditional template removal methods are used, then hollow particles are formed, but the process is destructive and unsustainable
Solution Approach 1:
The patent changes the sustainability parameters of the process by using metal carbonate templates instead of traditional organic polymers. This parameter change enables the template to be recovered and reused multiple times, transforming a single-use destructive process into a sustainable cyclic process that maintains manufacturing precision while improving environmental 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 non-destructive removal of the core material, allowing for the recycling of the template and the production of hollow particles, which can be reused, enhancing the sustainability and efficiency of the process.
Implementation Method 1
maintaining the pH at about 7 to about 10 to form core/shell particles comprising a silica treatment on the recyclable template particle
Implementation Method 2
coating the recyclable template particle with a solvent based silica precursor such as tetraethyl orthosilicate (TEOS)
Implementation Method 3
removing the recyclable template particle from the core/shell particles by depolymerization through thermal depolymerization, acid hydrolysis or base hydrolysis
Implementation Method 4
removing the recyclable template particle from the core/shell particles by depolymerization through thermal depolymerization, acid hydrolysis or base hydrolysis
Data Source
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Figure 3
AI summary
The disclosure provides a process for making hollow inorganic particles comprising: providing a recyclable template particle in an aqueous dispersion, wherein the recyclable template particle is prepared from an organic monomer; coating the recyclable template particle with a solvent based silica precursor; maintaining the pH at about 7 to about 10 to form core/shell particles comprising a silica treatment on the recyclable template particle; removing the core/shell particles; and removing the recyclable template particle from the core/shell particles to form a hollow silica particle.