Porous particle specific surface area characterization sensor based on BET gravimetric method and method
A technology of porous particles and specific surface area, applied in the field of sensors, can solve problems such as unsatisfactory
Pending Publication Date: 2019-01-08
JILIN UNIV
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Problems solved by technology
Therefore, the existing characterization method based on the BET adsorption theory and using a balance with an accuracy of about milligrams cannot meet the needs of the frontier field for the characterization of the specific surface area of porous granular materials with high specific surface area
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[0083] Such as Figure 1-7 As shown, the first-level resonant beam 4 is fixed above the base 1 through the first-level resonant beam support structure 3, and the recovery groove 2 is fixed above the base 1 and is located directly below the center position of the first-level resonant beam 4 in the length direction; the first-level resonant beam 4 One end of which is deposited with a primary piezoelectric excitation structure 5, and the other end is deposited with a primary piezoelectric pickup structure 6; the secondary piezoelectric excitation structure 7 is fixed at the center of the length direction of the primary resonant beam 4; the secondary resonant beam array 9 is fixed above the secondary piezoelectric excitation structure 7 through the support structure 8 of the secondary resonant beam array; Composed, and respectively used as a reference beam 902 and a detection beam 901; the secondary piezoelectric pickup structure 10 is deposited on the fixed end of the secondary r...
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The invention relates to a porous particle specific surface area characterization sensor based on a BET gravimetric method and method, and belongs to the field of sensors. The porous particle specificsurface area characterization sensor comprises a first-class resonate beam, a first-class resonate beam supporting structure, a base and a reclaiming tank, wherein a first-class piezoelectricity excitation structure is deposed at one end of the first-class resonate beam, and a first-class piezoelectricity vibration pickup structure is deposed at the other end of the first-class resonate beam; a second-class resonate beam array is fixed to a position above a second-class piezoelectricity excitation structure through a second-class resonate beam array supporting structure, and is provided witha referring beam and a detecting beam; a second-class piezoelectricity vibration pickup structure is deposed to the fixed end of the second-class resonate beam array. The porous particle specific surface area characterization sensor disclosed by the invention has the advantages of being novel in structure; the relationship between gas adsorption capacity of porous particles, the resonant frequencyoffset of the micro cantilever beams and gas pressure intensity is established, and the BET gravimetric method is utilized, so that precise characterization of the specific surface area is realized,the lower limit of the mass of a sample for porous particle specific surface area characterization is lowered, and the precision of the sensor is greatly improved.
Description
technical field [0001] The invention belongs to the field of sensors, and in particular relates to a sensor and a method for characterizing the specific surface area of porous particles based on the BET gravimetric method. Background technique [0002] The specific surface area refers to the internal and external areas of a unit porous solid or particle, usually expressed in m 2 / g means that it is one of the important characteristics of powder materials, especially ultrafine powder and nano powder materials. The finer the particles of the powder, the stronger its surface effects, such as surface activity, surface adsorption capacity, and catalytic ability. Determination of the specific surface area of solids and particles such as activated alumina Al 2 o 3 , graphite, rare earth, ultrafine silica powder SiO 2 , activated carbon, etc., are of great significance to the production and research work related to adsorption, catalysis, chromatography, metallurgy, building ...
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IPC IPC(8): G01N5/02
CPCG01N5/02
Inventor 王东方夏操杜旭其他发明人请求不公开姓名
Owner JILIN UNIV