The instruments for the calibration and characterization of particles
Instruments to calibrate and characterize the particles
The particle systems have a certain level of complexity in their structuring. Qu’Whether they are in a sample or on raw material, in a liquid state or in a solid state, mastering their characteristics allows you to exploit them in the right way. To calibrate and characterize particles, various scientific methods have been developed. These are based on state-of-the-art technologies, which are improved by the use of new technologies’year by year.
Here is the’essential to know about instruments and techniques for particle calibration and characterization.
Laser’particle size analysis by ²laser iffraction
L’instrument d’Laser diffraction analysis is one of the most widely used particle sizing instruments. And for this reason, it offers a wide range of on which the laser diffraction allows to obtain measurements’to obtain measurements.
Laser diffraction, a particle measurement technique popular for its efficiency
By laser diffraction, it is possible to measure particles of submicronic size, but also particles of millimetric size. This method of particle measurement ensures more precise measurement operations than those allowed by the’sieve and particle size analysis’other traditional methods. It has become the standard in many industries (cement industry, oil industry, etc.).). You can learn more about laser diffraction particle sizing by visiting websites specializing in the sale of laser diffraction products’scientific equipment.
Among other things, you will learn about the calibration principles used in laser diffraction particle sizing.
Granulometry by laser diffraction : how it works ?
To measure the size of particles, the technique of laser diffraction is used’s methods of calibration and characterization of particles’angle observed in the light scattering when particles are hit by a laser beam. For large particles, the light is scattered in a reduced radius. On the other hand, with small particles, the light scattering angles are wider.
L’intensity of the scattering towards the’The size of the particle will depend on the size of the particle (large or small).
In practice, to calibrate particles by laser diffraction, we pass them through a laser beam. Depending on their size, and thus on the size of the particle, they can be used for the analysis’Because of the angle of the diffracted light, the particles create diffraction images. L’The analysis of these is the’decisive step in particle size measurement.
According to the Mie theory or the Fraunhofer theory, spheres are obtained by optical modeling and mathematical calculations, whose volume is equivalent to the size of each particle and whose the diameter corresponds to the size of the particle.
Dynamic light scattering analysis
L’Dynamic light scattering (DLS) analysis is particularly useful in the chemical industry suitable for the characterization of nanoparticles.
Particle characterization by DLS: what are the areas of’application ?
This particle size measurement technique is widely used in industries handling chemical compounds of infinitely small size (biochemical industry, pharmaceutical industry, food industry, etc.).). These are the nanoparticle size analyzers that allow the use of the DLS technique.
Principles of particle sizing by dynamic light scattering
DLS calibration consists of measuring the size of particles suspended in a liquid content. When’a laser beam is projected onto the microcuvette containing the liquid, the light is reflected from all sides under the’particle action. This is called Rayleigh scattering (elastic scattering in which the length d’(the typical wave size is greater than the size of each individual particle). An angle is then defined (usually 90°), according to which the’The intensity of the light is measured in time.
The variations that will be observed are related to the’It is an excellent method of communication, as it provides information about the thermal agitation to which the particles are subjected, and the speed of movement of the particles.
The collected particle velocity information is then processed mathematically, in the’occurrence of autocorrelation between signal measured at time t and the same signal measured at t+1. Thanks to a graphical model, the characteristic time can be determined according to which this function decreases. The faster is the decay of the sample’The greater the speed of movement of the nanoparticle, the smaller its size.
We then estimate the relationship between the relaxation time (inverse of the characteristic decay time) and the particle diffusion coefficient, to characterize the latter. For the characterization of particles, nanoparticle size analyzers allow to determine the size of the particles’evaluate :
- l’polydispersity index,
- the hydrodynamic radius,
- the particle size distribution of the sample’analyzed sample.
Analysis of’dynamic images
In many industries, particle characterization (size measurement and shape determination) is essential in the production of nanoparticles setting in œs laboratories implement quality processes. L’dynamic particle size analysis’The image analysis, whose requirements are specified in the ISO 13322-2 standard, allows to analyze the sample’to obtain detailed information on the properties of the analyzed material.
A very precise granulometry technique
L’analysis’The main feature of dynamic images is that the’we capture the’We capture the image of each particle individually. Researchers and technicians in the laboratories of the European Union’This allows companies to more accurately determine the particle size distribution of various samples. This method of measuring particle dimensions is very useful’is based on of the systems of’analysis of’dynamic images, which are instruments capable of creating particle flows.
The flows are captured and analyzed by a specialized camera system.
Principles of particle size analysis’dynamic images
To proceed with the characterization of the particles via a dynamic analysis system, the’analysis of’dynamic images, the particles are set in motion for the images to be captured. They are illuminated by a beam of light’a côThey are illuminated by a light beam, while the images are recorded from the screen’other côs image acquisition system’projected shadows.
To optimize the analysis’In order to acquire images, particle sizing instruments by dynamic analysis are used’Dynamic images are designed so that the particles are in free fall (flowing sample or fluid granules) or suspended in a stream of water’air. The particles are presented in clearly separated units. The success of’a particle characterization by analysis of the data’dynamic images then depends on’a duration’sufficiently small exposure, and d’a high rate of image capture’images.
