Metal-Organic Framework Particle Size Control via Centrifugal Shearing
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Solution Overview
Problem
Conventional methods for manufacturing metal organic frameworks (MOFs) face challenges in producing high-quality MOFs with excellent monodispersibility and flowability, particularly when processing particulate MOF into compacts.
Innovation Solution
The method involves repeatedly applying centrifugal force and shearing force to a blend of a metal ion donor, a multidentate ligand, and a solvent, and particulating the multidentate ligand in advance to achieve MOF particles with a sharp particle size distribution, monodispersibility, and high flowability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional liquid-phase synthesis methods are used to manufacture MOFs, then the synthesis process is simple and well-established, but it is difficult to obtain high-quality MOF particles with sharp particle size distribution and excellent flowability in short reaction time
Solution Approach 1:
The multidentate ligand is pre-particulated to a specific particle size range (D50: 0.1-50.0 μm) before the synthesis reaction. This preliminary size control of the ligand enables the MOF particles to form with a sharp particle size distribution and excellent monodispersibility, resolving the contradiction between manufacturing precision and productivity by preparing the ligand in advance with controlled characteristics.
Solution Approach 2:
The invention changes the physical state and particle size parameters of the multidentate ligand from conventional fine powder to controlled particulate form (D50: 0.1-50.0 μm). This parameter change in the ligand's physical characteristics enables the synthesis to produce MOF particles with sharp size distribution and high flowability, achieving both high manufacturing precision and productivity.
2Ease of manufacture
If particulate MOF is processed into compacts for practical use, then the MOF can be applied as adsorbents, but poor monodispersibility and flowability reduce processability
Solution Approach 1:
The multidentate ligand is pre-particulated to a specific particle size range (D50: 0.1-50.0 μm) before synthesis. This preliminary size control ensures that the resulting MOF particles have excellent monodispersibility and flowability, which directly improves processability when forming compacts, pellets, or sheets, resolving the contradiction between ease of manufacture and manufacturing precision.
Solution Approach 2:
By controlling the ligand's particle size parameters (D50: 0.1-50.0 μm), the invention produces MOF particles with optimized physical properties including sharp size distribution and high flowability. These parameter changes in the final MOF product enable easy processing into compacts while maintaining high monodispersibility.
3Manufacturing precision
If the multidentate ligand is particulated in advance with median diameter D50 of 0.1 to 50.0 μm, then MOF particles with sharp particle size distribution are obtained, but additional processing steps are required
Solution Approach 1:
The ligand is pre-particulated to specific size (D50: 0.1-50.0 μm) before synthesis, which enables sharp particle size distribution in the final MOF product. Although this adds a preliminary processing step, it simplifies downstream processing and achieves better manufacturing precision with fewer subsequent intervention steps.
Solution Approach 2:
The invention changes the ligand's particle size parameter to a specific range (D50: 0.1-50.0 μm) that optimizes the synthesis outcome. This parameter change in the ligand enables production of MOF particles with sharp size distribution, and the benefit of improved product quality compensates for the additional processing step.
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 approach enables the production of MOF particles with a volume mean particle diameter of 1.0 to 30.0 µm and a D10/D90 ratio of 0.35 to 1.00, resulting in improved monodispersibility, flowability, and processability, particularly when forming pellets or sheets.
Implementation Method 1
a centrifuging-shearing step of simultaneously applying centrifugal force and shearing force to a blend including a metal ion donor, a multidentate ligand, and a solvent
Implementation Method 2
a centrifuging-shearing step of simultaneously applying centrifugal force and shearing force to a blend including a metal ion donor, a multidentate ligand, and a solvent
Data Source
Figure 1~3
AI summary
Provided is a metal organic framework having a volume mean particle diameter of from 1.0 to 30.0 µm, and a ratio D10/D90, which is a ratio of a median diameter D10 to a median diameter D90, of from 0.35 to 1.00. The metal organic framework can suitably be manufactured by a method for manufacturing a metal organic framework involving a centrifuging-shearing step of simultaneously applying centrifugal force and shearing force to a blend including a metal ion donor, a multidentate ligand, and a solvent, wherein the method further involves a step of recovering the blend subjected to the centrifuging-shearing step and subjecting the recovered blend to the centrifuging-shearing step again, or wherein the median diameter D50 of the multidentate ligand is from 0.1 to 50.0 µm.