Particle Analysis Device Using Magnetophoretic Velocity
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Solution Overview
Problem
Current particle evaluation methods, such as microscopic Raman spectroscopy and electron microscopy, are time-consuming and inadequate for industrial applications, failing to accurately measure surface area, pore diameter, and surface coverage rate of modifier molecules on particles, especially in solutions where particles swell, limiting their use in quality control and detailed analysis.
Innovation Solution
A particle analysis method and device utilizing volume magnetic susceptibility to measure the volume occupied by surface materials, surface area, pore dimensions, and surface coverage rate by measuring magnetophoretic velocities in magnetic fields, allowing for precise analysis of individual particles and their modifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If elementary analysis by microscopic Raman spectroscopy or electron microscopy is used to evaluate particles, then measurement precision of surface properties is improved, but measurement time increases significantly (about one hour per particle)
Solution Approach 1:
The patent replaces complex optical and electronic measurement systems (Raman spectroscopy, electron microscopy) with a magnetic field-based measurement system. By measuring the magnetophoretic velocity of particles in a magnetic field, the system determines volume magnetic susceptibility, from which surface coverage rate is calculated. This substitution reduces measurement time from one hour to a fraction of that time while maintaining accuracy.
Solution Approach 2:
The patent changes the measurement parameter from direct optical/electronic detection of surface properties to measurement of magnetic susceptibility. By measuring how particles move in a magnetic field (magnetophoretic velocity), the system derives volume magnetic susceptibility, which correlates with surface coverage rate. This parameter transformation enables rapid measurement without sacrificing precision.
2Measurement precision
If mercury intrusion technique or BET technique is used to measure surface area and pore diameter, then measurement precision is improved, but applicability to particles in solution deteriorates (cannot measure particles that swell in solution)
Solution Approach 1:
The patent changes the measurement approach from direct geometric measurement (mercury intrusion, BET) to magnetic susceptibility measurement. By measuring magnetophoretic velocity and calculating volume magnetic susceptibility, the system determines surface area and pore characteristics without requiring particles to be in a specific physical state. This allows measurement of particles in their native solution environment, even when swollen.
Solution Approach 2:
The magnetic susceptibility measurement method serves multiple functions: it measures surface area, pore diameter, and surface coverage rate simultaneously, and works for particles in various states (dry, swollen, in solution). This universal approach replaces multiple specialized techniques with a single versatile method.
3Ease of operation
If conventional methods are used to determine surface coverage rate by comparing used modifier molecules with residue, then measurement capability is provided, but measurement precision deteriorates (cannot sufficiently evaluate variations in surface coverage rate)
Solution Approach 1:
The patent replaces chemical analysis methods (comparing used vs. residue modifier molecules) with physical measurement of magnetic susceptibility. By measuring magnetophoretic velocity and calculating volume magnetic susceptibility, the system directly determines surface coverage rate with high precision, capturing variations that chemical methods miss.
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
Enables rapid and accurate measurement of surface area, pore characteristics, and surface coverage rate of modifier molecules on individual particles, facilitating efficient quality control and analysis in industrial settings.
Implementation Method 1
measuring a motion of the first particle in a first dispersion medium in the presence of a magnetic field generated in the first dispersion medium, obtaining a magnetophoretic velocity of the first particle from a result of the measurement of the motion of the first particle
Data Source
AI summary
A calculation unit (40) obtains the volume magnetic susceptibility of a first particle. Also, the calculation unit (40) obtains the volume magnetic susceptibility of a second particle different from the first particle. Thereafter, the calculation unit (40) obtains a volume occupied by a surface material included in the second particle on the basis of a relationship between the volume magnetic susceptibility of the first particle, the volume of the first particle, the volume magnetic susceptibility of the second particle, the volume of the second particle, the volume occupied by the surface material, and the volume magnetic susceptibility of the surface material.