Nanoparticulate Compressed Tablets for Microanalysis
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Solution Overview
Problem
Existing methods lack homogeneous standard reference materials (SRM) with properties similar to unknown samples for microanalysis, particularly for trace and ultra-trace elements, and existing press tablets are too coarse-grained and often contain binders, making them unsuitable for high-resolution microanalysis.
Innovation Solution
A process involving wet grinding and high-pressure pressing of analysis-ground powders with grain sizes <75 µm, forming nanoparticles without binders, and using a 'top-down' approach to create stable tablets with sizes between 30-150 nm, ensuring homogeneity and smooth surfaces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional powder pressing methods are used, then tablets can be produced with sufficient mechanical stability, but the particle size remains too coarse (10-100 μm) for high-resolution microanalysis
Solution Approach 1:
The patent applies parameter changes by reducing the particle size parameter from conventional 10-100 μm to nanoscale 30-150 nm through intensive ball milling processes. This dramatic parameter change enables the tablets to be suitable for high-resolution microanalysis while maintaining mechanical stability through the novel pressing methodology.
2Strength
If binders are added to ensure tablet stability, then mechanical strength is improved, but material homogeneity and purity are compromised
Solution Approach 1:
The patent applies the taking out principle by completely eliminating binders from the tablet formulation. Instead of adding external binding agents, the method achieves tablet stability through the inherent properties of nanoscale particles and optimized pressing parameters, thereby maintaining complete material homogeneity and purity without contamination.
Solution Approach 2:
The nanoscale powder particles serve their own binding function through enhanced cohesive forces at the nanoscale. The intensive ball milling process creates particles with high surface energy that naturally adhere to each other during pressing, eliminating the need for external binders while maintaining tablet integrity.
3Adaptability or versatility
If natural materials are used as reference materials, then material diversity is improved, but homogeneity at the micrometer scale is extremely rare or difficult to achieve
Solution Approach 1:
The patent applies parameter changes by transforming the particle size parameter from micrometer to nanoscale dimensions through intensive ball milling. This parameter transformation creates homogeneous nanoscale structures from diverse natural materials, enabling micrometer-scale homogeneity that is extremely rare in natural materials while preserving material diversity for various analytical applications.
4Stability of the object's composition
If synthetic glasses are produced, then material homogeneity is improved, but production difficulty and material limitations increase
Solution Approach 1:
The patent applies mechanics substitution by replacing the complex thermal melting and glass-forming processes with a purely mechanical ball milling approach followed by low-temperature pressing. This substitution eliminates the need for high-temperature melting, volatile loss, and strict material compatibility constraints, significantly easing production while achieving comparable or superior homogeneity.
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 process produces ultra-homogeneous tablets suitable for high-resolution microanalysis, suitable as certified SRM, enabling accurate element and isotope composition measurements without binder dilution or material change, and suitable for various microanalysis methods.
Implementation Method 1
a) grinding in a ball mill
Implementation Method 2
b) freeze-drying
Implementation Method 3
c) pressing of the nanopowder, particularly with sapphire discs, in a preferably programmable high-pressure press
Data Source
Figure 1~2
AI summary
The invention relates to a method for producing nanoparticulate compressed tablets/pellets from synthetic and/or natural materials. The invention also relates to compressed tablets/pellets produced using a method for producing nanoparticulate compressed tablets/pellets from synthetic and/or natural materials and to uses thereof.