Device and method for measuring a diffusion coefficient of nano-particle fluid through hollow-fiber micropores

A particle diffusion coefficient measuring device comprising:

• a hollow-fiber comprising a first inlet and a first outlet and micropores on a surface of the hollow-fiber, the hollow-fiber providing a first passage extending from the first inlet to the first outlet for a first fluid having suspended particles to transport through, and the first fluid being introduced into the first passage via the first inlet and being discharged via the first outlet;
• a fluid passage means having a second inlet and a second outlet, formed outside the hollow-fiber to communicate with the inside of the hollow-fiber via the micropores, the fluid passage means providing a second passage for a second fluid to transport through in such a scheme that the second fluid is delivered via the second inlet to flow in the same direction as that of the first fluid and is discharged from the second outlet;
• a concentration change measuring means for detecting a change in concentration of the particles in the second fluid discharged out of the second outlet of the fluid passage means over a time change;
• and
• a diffusion coefficient calculating means for calculating a particle diffusion coefficient by using the concentration change of the particles over the time change.