FIELD: analytical instrument making, possibly development of measuring devices.
SUBSTANCE: method comprises steps of placing sample in certain space; filling free volume of space with insert having small total surface; blowing space by means of gas mixture flow containing adsorbing gas (gas whose boiling temperature is higher than or equal to temperature of liquefied nitrogen) and carrier gas; cooling space until temperature liquefied nitrogen temperature; providing in space dynamic balance between gaseous and adsorption phases; heating sample and measuring change of concentration of adsorbing gas. Blowing of space with sample and insert is realized by supplying gas mixture over surface of sample. Apparatus for performing the method includes at least one ampoule with tested material; furnace; Dewar vessel; ampoule; first quick-release joint for fastening ampoule in casing; pipe for feeding gas mixture into ampoule; screen mechanically joined with casing and forming cavity in Dewar vessel where lower part of ampoule with sample is arranged; electrically operated valve connecting cavity with atmosphere. Casing has two portion, detachable head of adsorber and stationary body of screen. Pipe for supplying gas mixture is in the form of tube open at both ends. Lower end of tube is placed at level no less than maximum level of charging tested material and it includes in addition insert made of material with small total surface and arranged in ampoule with sample. Apparatus also includes second quick-release joint for sealing adjoined surfaces of adsorber head and screen body. Insert has in its end surface ducts in the form of grooves or holes. Second quick-release joint is in the form of leverage mechanism having equalizing clamping ball bearings.
EFFECT: enlarged range of measured specific surfaces, enhanced accuracy of measurements, possibility for measuring specific surface of powder materials with finely dispersed structure and small specific surface.
6 cl, 6 dwg, 1 tbl, 3 ex
