Distribution Measuring Instrument - メーカー・企業6社の製品一覧とランキング

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  1. マイクロトラック・ベル Osaka//others
  2. シバタ ファインバブル事業部 Aichi//others
  3. ウェーブクレスト Saitama//Educational and Research Institutions
  4. 4 ナノシーズ Aichi//others
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  1. [Data] Particle Size Distribution (Particle Diameter Distribution) and Particle Shape of Activated Carbon マイクロトラック・ベル
  2. Particle Size Distribution (Particle Diameter Distribution) and Particle Shape Measurement Device 'SYNC' マイクロトラック・ベル
  3. [Data] Cement and Particle Size Distribution (Grain Size Distribution) マイクロトラック・ベル
  4. Laser diffraction and scattering particle size distribution measurement device MT3000 II series マイクロトラック・ベル
  5. 5 [Data] Particle size distribution and particle shape of superabsorbent polymers マイクロトラック・ベル

Distribution Measuring Instrumentの製品一覧

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[Data] Particle size distribution and particle shape of superabsorbent polymers

[Data] Particle size distribution and particle shape of superabsorbent polymers

The particle size distribution of polymer granules is very important in the quality control process!

This document introduces the particle size distribution and particle shape of superabsorbent polymers (SAPs). Superabsorbent polymers are granular polymers that have the ability to absorb liquids up to 500 times their own weight. Different particle size distributions of polymer granules are required depending on the application, so managing particle size distribution is very important in the quality control process. [Contents (excerpt)] ■ Extruded products ■ Manufacturing of superabsorbent polymers ■ Measurement example 1: Suitable measurement methods for SAP ■ Example 2: Reproducibility and equipment calibration ■ Example 3: Measurement of particle shape ■ Summary *For more details, please refer to the PDF document or feel free to contact us.

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[Data] Particle size distribution of toner particles (particle diameter distribution) and particle shape

[Data] Particle size distribution of toner particles (particle diameter distribution) and particle shape

Quality control of toner is very important for high-resolution printing.

This document introduces the particle size distribution (particle diameter distribution) and particle shape of toner particles. Toner is a coloring particle primarily used in electrostatic printing, such as copiers and laser printers, and consists of very fine powder made up of particles ranging from 5 to 30 μm. It has fluidity and behaves like a liquid. It is composed of various auxiliary materials such as synthetic resins, pigments, and magnetic particles, and the demands for performance and quality of toner have become very high in order to achieve high-resolution printing performance. [Contents (excerpt)] ■ Applications ■ Static Image Analysis Device CAMSIZER M1 ■ Sample Preparation ■ Measurement Results ■ Particle Image Analysis *For more details, please refer to the PDF document or feel free to contact us.

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Particle size (particle diameter)

Particle size (particle diameter)

The size of the same particle can change depending on the perspective.

The particle diameter of a true sphere is uniquely determined. However, non-spherical particles can vary in size depending on the measurement method. For example, ground materials have different shapes for each individual particle. Therefore, to determine the overall size of a powder from individual particle diameter measurements, it is necessary to measure a large number of particles using the same method and statistically determine the particle size. In visual inspection or image analysis, it is common to measure the "equivalent diameter," which is the size of a particle with an ideal shape (usually circular) equal to the projected area of the particle, or the "directional diameter," which measures the length in a specific axial direction for randomly oriented particles. Additionally, there is the aspect ratio, which represents the ratio of the long axis to the short axis of the particle. Our particle size distribution measurement device measures particles as aggregates, so it cannot be discussed on the same level as measurements taken with microscopes and similar instruments. Among the Microtrack methods, the laser diffraction method outputs the particle size distribution of an aggregate of spherical particles that exhibit a scattering pattern equivalent to the obtained light scattering pattern. The dynamic light scattering method outputs the sphere-equivalent diameter based on diffusion. *For more details, please refer to the related links or feel free to contact us.*

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Particle size distribution

Particle size distribution

To properly evaluate powder particles, not only the average particle size but also the particle size distribution is important.

The size of particles as a bulk, that is, as an aggregate, is typically represented by the distribution of the presence ratio for various measurement results according to size (particle diameter). The criteria for the presence ratio can be based on volume (volume distribution), number (number distribution), etc. In microtrack (laser diffraction and scattering method), volume distribution is measured in principle. (It is easy to convert to number criteria using software, assuming the shape of the particles is spherical.) The sedimentation method is a mass-based measurement method, but since the density of the sample is required during the measurement process, volume distribution can also be obtained. In dynamic light scattering, it is common to obtain the presence ratio as the relative intensity of the signal, but in the case of nanotracks, volume distribution can be output. Particle size distribution can be represented as frequency or as a cumulative distribution. The cumulative distribution can have an oversize curve that rises to the right with fine particles set to zero, and an undersize curve that falls to the right with coarse particles set to zero. *For more details, please refer to the related links or feel free to contact us.*

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Rayleigh scattering

Rayleigh scattering

A theory applicable to scattered light from particles much smaller than the wavelength of laser light.

Rayleigh scattering is primarily discussed in the context of very small particles compared to wavelengths such as 0.05 μm, and an example that measures up to this scattering region in this explanation collection is the nanotrack. However, since the role of Rayleigh scattering within the fundamental principles is somewhat different, I will limit this to a brief explanation of Rayleigh scattering here. The most common example of Rayleigh scattering is the blue sky. This scattering occurs due to the O2 and N2 molecules surrounding the Earth, resulting in the short-wavelength blue light being enhanced, making the sky appear blue. *For more details, please refer to the related links or feel free to contact us.*

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Mie scattering

Mie scattering

Basis of laser diffraction and scattering devices.

G. Mie successfully handled the diffraction of plane monochromatic waves by uniform spheres of arbitrary diameter and material, which exist in a homogeneous medium, using electromagnetism in 1908, obtaining an exact solution. This scattering phenomenon is very important to us. The significance of Mie scattering lies in the fact that a considerable portion of the measurement range of the particle size distribution measurement devices we are dealing with falls within this category. However, mathematically solving Mie's scattering presents very challenging elements. Although programs have already been developed to solve Mie's equations using computers, it remains a difficult task, and how to overcome this problem becomes the know-how of particle size distribution measurement device manufacturers. *For more details, please refer to the related links or feel free to contact us.*

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Diffraction of light

Diffraction of light

Huygens' principle

One famous person who explained the behavior of light based on its rectilinearity and wave-like properties is the renowned Huygens. Huygens used the following model to explain the rectilinearity of light. Diffraction phenomena can often be observed up close among you. For example, I don't wake up very early, so I haven't seen it much, but before the sun fully appears at sunrise, the ridge of the eastern mountains can be seen glowing strongly as if outlined by light. This is the diffraction of light. *For more details, please refer to the related links or feel free to contact us.

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Fraunhofer diffraction

Fraunhofer diffraction

Interference of light using parallel light.

The diffraction theory explained by the other Fraunhofer actually serves as the fundamental theory for the particle size distribution measurement device using laser diffraction, which will be discussed later. In a very rough classification to distinguish it from Fresnel diffraction: - Fresnel diffraction occurs when both the light source and the observation point are close to the aperture where diffraction occurs. - Fraunhofer diffraction occurs when both the light source and the observation point are infinitely far from the aperture where diffraction occurs. The Fraunhofer diffraction phenomenon can be mathematically expressed more simply compared to Fresnel diffraction. For experts in optics, this may seem like a rough development akin to being struck by lightning, but for those who are eager to understand the reason behind the formation of fringes, I strongly recommend reading the reference materials on light provided in the appendix. *For more details, please refer to the related links or feel free to contact us.*

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Interference

Interference

A model of the wave surface when a stone is thrown into the water.

This characteristic is not very much related to the laser diffraction method. Interference becomes an important phenomenon in understanding the principle of nanotracks. An example of interference is the model of wave patterns when a stone is thrown into the water surface. If two stones are dropped at a distance apart on the water surface, it can be observed that when the crest of one wave meets the trough of another wave, the waves weaken, while when crests meet crests, the waves strengthen. This is interference. The first concept that comes up is a mathematical theorem called "Fourier's theorem." According to this theorem, if certain conditions are met, any function can be expressed as a sum of a finite or infinite number of sine functions. In simple terms, most waveforms can be decomposed into multiple sine curves. *For more details, please refer to the related links or feel free to contact us.*

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What kind of particle size is the volume average diameter [MV] in particle size measurement?

What kind of particle size is the volume average diameter [MV] in particle size measurement?

[MV] is the volume-weighted average diameter!

The volume average diameter refers to the "MV" value. However, it is important to note that the cumulative 50% particle diameter is often referred to as the average diameter. This cumulative 50% particle diameter should be referred to as the median or mid-diameter. Below are representative examples of characteristic values that describe the particle size distribution of powders. [10%, 50%, 90%] 10%, 50%, 90% (μm: micrometers) Assuming a collection of a powder, let’s say its particle size distribution has been determined. When the cumulative curve is obtained with the total volume of the powder population set to 100%, the particle diameters at the points where the cumulative curve reaches 10%, 50%, and 90% are referred to as the 10% diameter, 50% diameter, and 90% diameter (μm), respectively. In particular, the 50% diameter is commonly used as one of the parameters to evaluate particle size distribution as the cumulative median diameter (Median diameter). *For more details, please refer to the related links or feel free to contact us.

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Why can a microtrack produce results even when multiple samples are mixed?

Why can a microtrack produce results even when multiple samples are mixed?

Unique optical system design, equipped with three lasers, slit-shaped detector structure.

The shape of the microtrack detector is slit-like, extending outward from the center of the scattering angle. In the laser diffraction/scattering method, laser light is irradiated onto particles, and the scattered light containing particle size information is detected by a detector of a certain shape to determine the particle size distribution. However, depending on the shape of the detector, the particle size information will result in signals that are proportional to the square, cube, or fourth power of the particle size. Particle size distribution data is typically expressed on a volume basis proportional to the cube of the particle size, but with commonly used detectors, various corrections must be applied to display volume-based particle size distribution data. With the slit-shaped detector of the microtrack, signals proportional to the cube of the desired particle size can be directly extracted. The significant reason why only the microtrack can provide accurate data on the mixing ratio of samples lies in the difference of this detector. *For more details, please refer to the related links or feel free to contact us.*

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Meaning of symbols in microtrack measurement results (summary data)

Meaning of symbols in microtrack measurement results (summary data)

I will explain the meanings of the symbols in the measurement results (summary data). You can also view frequently asked questions and their answers.

On this page, we explain the meanings of the symbols used in the microtrack measurement results (summary data). We provide explanations using formulas and tables for the Mean Volume Diameter [MV], Mean Number Diameter [MN], Mean Area Diameter [MA], and Specific Surface Area (m2/ml) [CS], among others. We have compiled frequently asked questions on this page. You can view detailed information through the related links. 【Contents (partial)】 ■[MV] Mean Volume Diameter: Volume Average Diameter ■[MN] Mean Number Diameter: Number Average Diameter ■[MA] Mean Area Diameter: Area Average Diameter ■[CS] Calculated Specific Surface Area: Specific Surface Area (m2/ml) ■[SD] Standard Deviation: Standard Deviation *For more details, please refer to the related links or feel free to contact us.

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Technical Information: Free Space Measurement Method

Technical Information: Free Space Measurement Method

There is no need to maintain the liquid level, and continuous measurement of free space changes is possible even during gas adsorption measurements!

The free space (dead volume) is not a geometric volume, but a convenient volume for calculating the amount of adsorption. To achieve physical adsorption, when the sample tube is cooled with a refrigerant such as liquid nitrogen, two temperature regions are created, and the gas density in this cooling section is affected by the cooling temperature and the changes in the level of the refrigerant during measurement. We provide detailed information on our website, so please take a look. *For more details, please refer to the related links or feel free to contact us.

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Technical Information: Specific Surface Area and Particle Diameter

Technical Information: Specific Surface Area and Particle Diameter

Samples with the same weight and actual volume can have different surface areas! An introduction to specific surface area and particle diameter.

As the particle size decreases, the specific surface area increases, and naturally, if there are pores in the particles, the specific surface area will also increase. This is important in processes and reactions, as the amount of surface sites and adsorption capacity can change even for the same material (per weight or per volume). Measuring the specific surface area is an important parameter for understanding the activity and adsorption capacity of materials (such as adsorbents and catalysts). On our website, we provide diagrams illustrating the relationship between particle size and surface area. Please take a look. *For more details, please refer to the related links or feel free to contact us.*

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Technical Information: BET Theory

Technical Information: BET Theory

The theory of monolayer adsorption has been extended to multilayer adsorption! Here is a basic introduction to the evaluation method of BET specific surface area.

The specific surface area is usually analyzed using the BET theory (Brunauer-Emmett-Teller theory) from gas adsorption isotherms. The BET theory models the adsorption process starting from strong adsorption sites on the solid surface, and as the pressure increases, adsorption occurs on the next strongest sites. It also models the simultaneous occurrence of adsorption in the second and third layers. Our website presents this information using diagrams and graphs. Please take a look. *For more details, please refer to the related links or feel free to contact us.*

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