Abstract
The quality of nanomaterials and nanotechnologies is largely determined by the stability of the applied technologies, which, to a large extent, depend on the constancy of particle sizes. In this regard, metrological problems arise that are associated both with measuring the dimensions of the microstructure of aerosols, suspensions and powders, and with ensuring the uniformity of measurements when transferring a unit of a physical quantity from a standard to working measuring instruments. The purpose of this work was to determine and calculate the error in transferring the size of a unit of length when measuring the diameter of nanoparticles.An analyzer of differential electric mobility of particles was determined as a reference measuring instrument for which the calculation was made. It allows the separation of aerosol particles based on the dependence of their electrical mobility on the particle size. In combination with a condensation particle counter, it allows you to scan an aerosol and build a particle size distribution function. This measurement method is the most accurate in the field of measuring the diameters of particles in aerosols, therefore, the error in the transmission of particle size must be set as for a standard.The paper describes the physical principles of measurement by this method and presents an equation for determining the diameter of nanoparticles. Based on this equation, the sources of non-excluded systematic error were identified. Also, an experimental method was used to determine the random component of the measurement error of nanoparticles and to calculate the error in transferring the size of a unit of length when measuring the diameter of nanoparticles.The obtained results will be used for metrological support of standard samples of particle size, ensuring traceability of measurements of aerosol particle counters and for aerosol research.
Highlights
Nanoparticles and nanotechnology are one of the most promising areas of scientific development at the present stage, creating preconditions for solving various applied technological problems
Differential analysis of the electrical mobility of particles in aerosols” provides that the measurement of particle sizes in the analysis of the disperse composition of gaseous media is carried out using a differential particle mobility analyzer (DMA)
Physical principles of measuring particle diameters by electrical mobility. This method is based on the physical principle of differential electrical mobility analysis, which separates aerosol particles based on the dependence of their electrical mobility on particle size
Summary
Nanoparticles and nanotechnology are one of the most promising areas of scientific development at the present stage, creating preconditions for solving various applied technological problems. The harmonization of methods for measuring the size of nanoparticles is extremely demanded, firstly, to ensure the continuous development of nanotechnology and support trade in nanoproducts, and secondly, to assess the potential danger of their impact on the environment, health and safety of human life [6]. Under these conditions, it is very important to ensure the metrological traceability of measurements of nanoparticles, including the creation of the necessary reference means of changes. Differential analysis of the electrical mobility of particles in aerosols” provides that the measurement of particle sizes in the analysis of the disperse composition of gaseous media is carried out using a differential particle mobility analyzer (DMA)
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