Rare Earth Carbonate Fine Particles with Amine Oxide Growth Control
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Solution Overview
Problem
Existing methods for producing rare earth oxide particles result in large particle sizes and poor dispersibility, and it is difficult to stably produce submicron or less particles with excellent dispersibility.
Innovation Solution
A method involving the addition of an alkyldimethylamine oxide or methylmorpholine oxide compound to an aqueous solution of rare earth ions and excess urea, followed by hydrothermal treatment, to control particle growth and agglomeration, resulting in rare earth carbonate fine particles with a size of 10-200 nm and excellent dispersibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional hydrothermal treatment is used to produce rare earth oxide particles, then the production process is simple, but the average particle size is large and dispersibility is remarkably inferior
Solution Approach 1:
An alkyldimethylamine oxide compound or methylmorpholine oxide compound is introduced as an intermediary substance that selectively adsorbs to reaction points during particle growth. This mediator suppresses particle growth and agglomeration, enabling precise control of particle size to submicron or less while maintaining production process feasibility
Solution Approach 2:
The invention changes the chemical composition parameters by adding specific amine oxide compounds in controlled amounts (10 to 200 mol% relative to rare earth ion). This parameter change fundamentally alters the particle growth behavior, achieving excellent dispersibility and fine particle size without overly complicating the production process
2Manufacturing precision
If reaction conditions such as amount of rare earth salt, reaction temperature, and reaction time are controlled, then the production process remains conventional, but stable production of rare earth oxide fine particles of submicron or less having excellent dispersibility is difficult
Solution Approach 1:
The alkyldimethylamine oxide compound or methylmorpholine oxide compound acts as a reliable intermediary that consistently suppresses particle growth at reaction points. This mediator provides stable and reproducible particle size control, enabling reliable production of submicron particles with excellent dispersibility across multiple batches
Solution Approach 2:
The amine oxide compounds provide a feedback mechanism by selectively adsorbing to active growth sites on particle surfaces. This adsorption dynamically regulates particle growth, preventing excessive growth and agglomeration, thereby ensuring stable production of uniform fine particles
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
Stable production of rare earth carbonate fine particles with submicron or less size and good dispersibility, enabling a wide range of applications, particularly in semiconductor-related electronic materials as polishing particles.
Implementation Method 1
an effect that an alkyldimethylamine oxide compound having a structure represented by the above formula (1) or methylmorpholine oxide selectively adsorb to reaction points where particles grow in particle growth reaction process to appropriately suppress the particle growth and particle agglomeration
Implementation Method 2
an aqueous solution containing rare earth ion and an excess amount of urea with respect to the rare earth ion... subjecting the reaction solution to hydrothermal treatment to produce rare earth carbonate fine particles
Data Source
AI summary
A method for producing rare earth carbonate fine particles, including, forming a reaction solution in which an alkyldimethylamine oxide compound having a structure represented by the following formula (1) or a methylmorpholine oxide compound is added to an aqueous solution containing rare earth ion and an excess amount of urea with respect to the rare earth ion, such that the compound is added in an addition amount of 10 to 200 mol % relative to the rare earth ion, and subjecting the reaction solution to hydrothermal treatment to produce rare earth carbonate fine particles. This provides a method for producing rare earth carbonate fine particles of submicron or less and having excellent dispersibility.wherein R represents an alkyl group of C1 to C14.