Adsorption characteristic measuring apparatus
View Patent ↗An adsorption characteristic measuring apparatus according to the invention supplies a predetermined adsorption gas to a film formed body as a sample accommodated in a sample tube to measure adsorption characteristics. In the inside of the sample tube, a void between an inner wall surface of the sample tube and the sample is filled with a particle-like filler having higher thermal conductivity than the adsorption gas under a measurement pressure. In addition, a glass rod as a dead volume reducing rod, a spacer ring for forming a thermal insulation space between the particle-like filler and the glass rod, and a reflective plate for reflecting radiant heat are disposed.
1. An adsorption characteristic measuring apparatus that supplies a predetermined adsorption gas to a sample accommodated in a sample tube to measure an adsorption isotherm, the apparatus comprising:
a refrigerant container that is filled with a constant temperature refrigerant having the sample tube immersed therein;
a fitting portion that is provided at an opening of the sample tube;
an adsorption gas supply portion that supplies the adsorption gas;
a manifold that is connected via an on-off valve for the sample tube to the fitting portion;
a manifold pressure gauge that detects a pressure of the manifold;
a sample tube pressure gauge that detects an internal pressure of the sample tube; and
a measurement controller that calculates the adsorption isotherm based on a change in the internal pressure of the sample tube, wherein
the sample is a film formed body or a formed body, and
a space between an inner wall surface of the sample tube and the sample is filled with a particle-like filler having higher thermal conductivity than the adsorption gas under a measurement pressure.
2. The adsorption characteristic measuring apparatus according to claim 1 , wherein the particle-like filler is metal particles.
3. The adsorption characteristic measuring apparatus according to claim 2 , wherein the particle-like filler is aluminum particles.
4. The adsorption characteristic measuring apparatus according to claim 1 , wherein the inside of the sample tube is disposed with: a dead volume reducing rod that is made of the same material as the sample tube to reduce an upper dead volume of a sample-side region which is a region around the sample filled with the particle-like filler; and a spacer ring that is provided between a bottom side of the dead volume reducing rod and an upper surface side of the sample-side region and has lower thermal conductivity than the particle-like filler.
5. The adsorption characteristic measuring apparatus according to claim 4 , further comprising a reflection plate that adheres to the bottom side of the dead volume reducing rod to reflect radiant heat from the sample-side region and the dead volume reducing rod.
6. The adsorption characteristic measuring apparatus according to claim 1 , wherein the fitting portion is a joint that is used such that metal surfaces are airtightly held by being abutted against each other.
7. The adsorption characteristic measuring apparatus according to claim 1 , wherein the film formed body is formed with a film having pores of different diameters, ranging from micropores to macropores, on a surface of a tubular support body, and
wherein the formed body has pores of different diameters ranging from micropores to macropores.