Pore integrated module and test method for measuring specific surface area based on flow method
A specific surface area, integrated module technology, applied in measuring devices, instruments, scientific instruments, etc., can solve the problems of complex structure of dynamic specific surface area analyzer, many air leakage points, manual operation, etc., to reduce human error and reduce erection. The effect of connecting and ensuring air tightness
Active Publication Date: 2022-03-11
UNIV OF SCI & TECH BEIJING
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Problems solved by technology
[0013] In order to solve the problems of the current dynamic specific surface area analyzer with complex structure, many air leakage points, manual operation and variable temperature environment, the invention provides a channel integrated module and testing method based on the flow method to measure the specific surface area
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Embodiment 1
[0092] The embodiment of the present invention measures the specific surface area of white carbon black.
[0093] Weigh 0.4 g of dehydrated and dried silica, place it in the sample tube, connect the air inlet of the sample tube to the gas outlet of the reference arm of the thermal conductivity cell through an O-ring, and connect the gas outlet of the sample tube to the gas outlet. The outlet of the sample tube of the guide module is sealed and connected by an O-ring; nitrogen and helium respectively use 10L gas cylinders with a purity greater than 99.9%, and are respectively connected to the nitrogen inlet and helium of the gas distribution module after being pressure-stabilized by a bipolar pressure reducing valve. The inlet is connected; first open the helium bipolar pressure reducing valve, adjust the pressure to 0.13MPa, and measure the helium flow rate to 40mL / min through the helium flow measurement process; then open the nitrogen bipolar pressure reducing valve, and adj...
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Abstract
The invention provides a channel integrated module and a testing method for measuring the specific surface area based on a flow method, and belongs to the technical field of material specific surface area measurement. The channel integrated module includes a gas distribution module and a gas guide module, the gas distribution module and the gas guide module are connected and fastened by screws inserted into the screw fastening holes, and the channel integrated module passes through the gas mixing cavity sealing ring groove and the calibration channel sealing ring The grooves and the O-rings placed in the two grooves are sealed. The channels in the gas distribution module and the gas guide module are connected or blocked by seat-mounted solenoid valves fixed on the surface. Seat-mounted solenoid valves at different positions The power on and off of the valve can control the flow route of the gas in the channel, so as to meet the needs of different processes such as flow measurement and volume calibration. This module simplifies the pipeline structure of the dynamic specific surface area analyzer, reduces gas leakage points, improves automation, stabilizes the gas temperature, and ensures the accuracy of specific surface area measurement.
Description
technical field [0001] The invention relates to the technical field of measuring the specific surface area of materials, in particular to a channel integrated module and a testing method for measuring the specific surface area based on a flow method. Background technique [0002] The specific surface area refers to the sum of the inner surface area and outer surface area per unit mass of a substance, and is a strength index to measure the performance of materials such as ultrafine solid powders, porous particles, and films. The dynamic specific surface area analyzer adjusts the flow rate of nitrogen and helium, mixes the two gases in different proportions, and then passes through the solid material at the temperature of liquid nitrogen, so that the nitrogen in the mixed gas is adsorbed on the surface of the material and saturated after a period of time After that, the nitrogen adsorbed on the surface of the material is desorbed instantaneously by heating at room temperatur...
Claims
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IPC IPC(8): G01N30/00G01N7/04
CPCG01N30/00G01N7/04
Inventor 张辉佟美琪袁畅回朝妍高宇贾梦涵
Owner UNIV OF SCI & TECH BEIJING