Which liposome (a vesicle with a lipid bilayer) will absorb a small hydrophobic molecule the fastest at cold temperatures?

At cold temperatures, lipids tend to become more ordered and less fluid. Unsaturated phospholipids contain double bonds in their fatty acid chains, which introduce kinks and prevent tight packing of the lipid molecules. As a result, membranes rich in unsaturated phospholipids remain more fluid at lower temperatures compared to those with saturated phospholipids. This increased fluidity allows for faster diffusion and absorption of small hydrophobic molecules into the liposome.