Problem with flux after pretreatment

[Yul]

I am doing a research with polysulphone membranes. The pretreatment for the membranes was done by submerged it in the ethanol 80%. As far as I know, after submerged in the ethanol, the flux should be going up. But my experiment result showed that the flux was going down. Can anybody please help me by suggesting why?
Thank you.

 

[kramerpw]

We need a little more information.

What type of separation or species flux are you trying to measure (gas, vapor, liquid) following the ethanol exposure?

What are your operating conditions?

You refer to the ethanol exposuure as a pretreatment: was this as a water removal step immediately following fabrication of the membrane or an exposure on a fabricated membrane in hopes of modifying its performance?

 

[Yul]

I measure liquid (water) separation

The operating conditions : pressure = 2atm.

The ethanol exposure as a pretreatment is an exposure on a fabricated membrane in hopes of modifying its performance, to improve the water fluxes with no loss in rejection.

Thank you very much.