МЕТОДЫ И УСТРОЙСТВА ДЛЯ ИЗМЕРЕНИЯ УДЕЛЬНОЙ ПОВЕРХНОСТИ ДИСПЕРСНЫХ МАТЕРИАЛОВ

Abstract

The aim of this work is to systematize the information contained in scientific publications, patents, websites on methods and devices of measuring the specific surface area of dispersed materials, the classification of measurement methods, consideration of their physical bases, comparative analysis of metrological characteristics and mathematical models for specific surface measurements. Comparative analysis of mathematical models of measurement, metrological characteristics and the physical basis of the method is given. A patent search revealed that the described invention is used as adsorbate gas, nitrogen or argon, an inert gas (helium) as the carrier gas. To achieve adsorption temperature the liquid nitrogen is used as the refrigerant. Analysis of commercially available models suggests that a significant portion of analyzers operates on the base of the low-temperature gas adsorption method (BET), and only a small part is made with limited permeability methods measurement range of the specific surface materials. The most used is a laboratory method of low-temperature gas adsorption (BET method or MTD). Despite the many commercially available analyzers are fundamentally common dynamic response - a long analysis time, due to the fact that adsorption processes at low temperatures are slow. Such speed information to the control system is unacceptable because they do not allow the quality control process. Search and development of high-speed analyzer remains relevant for the determination of the specific surface.