I need some suggestions regarding how to make put sample solution into the dialysis tube. I tried to to open the dialysis tube but I could not. In some papers they suggest to wash in water, this will help to open the tube so that sample solution can easily be put into the tube. However, my experiment is in organic solvent. I just want to remove CHCl3 solvent from block copolymer micelle in toluene solvent. Could anybody suggest me about it?