Silica Particle Synthesis via Controlled Alkali Catalyst Concentration
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Solution Overview
Problem
Conventional methods for producing silica particles often result in coarse aggregates and spherical particles, which lack shape stability and high purity, especially when using the sol-gel method.
Innovation Solution
A method involving the preparation of an alkali catalyst solution in an alcohol solvent with a specific concentration, followed by the concurrent supply of tetraalkoxysilane and alkali catalyst, allowing for the generation of atypically shaped silica particles with reduced coarse aggregates and enhanced mechanical strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional sol-gel method is used to produce silica particles, then production process is simple, but coarse aggregates and spherical particles are formed resulting in poor shape stability and low purity
Solution Approach 1:
The invention changes the chemical parameters of the reaction system by using specific alkali catalysts (ammonium hydroxide, potassium hydroxide, or sodium hydroxide) at controlled concentrations (0.01-10 wt%), and controlling the molar ratio of alkali catalyst to tetraalkoxysilane (0.001-0.5). These parameter changes prevent coarse aggregate formation and achieve uniform atypical particle shapes while maintaining process simplicity
Solution Approach 2:
The invention creates a composite reaction system combining tetraalkoxysilane (raw material) with specific alkali catalysts and alcohol solvents. This composite approach where multiple components work synergistically prevents spherical particle formation and achieves the desired atypical particle morphology with high shape stability
2Manufacturing precision
If conventional methods are used, then production speed is fast, but particle purity is low due to coarse aggregates
Solution Approach 1:
By optimizing the alkali catalyst concentration (0.01-10 wt%) and the molar ratio of alkali catalyst to tetraalkoxysilane (0.001-0.5), the invention achieves rapid hydrolysis and condensation reactions that form uniform particles without coarse aggregates, thereby maintaining high production speed while improving particle purity
3Stability of the object's composition
If alkali catalyst is used in conventional amounts, then reaction proceeds quickly, but particle shape stability deteriorates
Solution Approach 1:
The invention establishes specific parameter ranges for alkali catalyst concentration (0.01-10 wt%) and molar ratio to tetraalkoxysilane (0.001-0.5) that simultaneously achieve rapid reaction and uniform atypical particle shapes. The use of specific alkali catalysts (ammonium, potassium, or sodium hydroxide) at these controlled parameters ensures both shape stability and particle uniformity
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 produces silica particles with high shape stability and reduced non-uniformity, achieving high purity and mechanical strength while minimizing the use of alkali catalyst and eliminating the need for its removal step.
Implementation Method 1
an alcoholic silica sol obtainable by subjecting an alkyl silicate to hydrolysis and a condensation reaction
Implementation Method 2
an alcoholic silica sol obtainable by subjecting an alkyl silicate to hydrolysis and a condensation reaction
Implementation Method 3
in the presence of an alkali catalyst such as ammonia
Data Source
AI summary
The invention provides a method of producing silica particles, the method including preparing an alkali catalyst solution containing an alkali catalyst in a solvent including an alcohol, at a concentration of from about 0.6 mol/L to about 0.85 mol/L; and supplying tetraalkoxysilane into the alkali catalyst solution, and concurrently supplying an alkali catalyst into the alkali catalyst solution at a rate of from about 0.1 mol to about 0.4 mol per mole of the total amount of supply of the tetraalkoxysilane supplied in one minute.