I added 100 g coconut oil, 100 g distilled water and 500 mg lecithin to an 1800 watt blender. The motor from the blender has has a passive heating action. I blended it at full for four minutes. The result seemed to be a hot, uniform substance with a thin layer of foam on top.
I poured this mix into a smaller container and placed it in the fridge. After a while it set into a solid, uniform substance with no apparent precipitation.
I then heated the substance in the microwave for thirty seconds. When I removed it, the components had separated and precipitated. Cooling it in the fridge again resulted in a delicate solid sheet at the top which broke through to liquid underneath.
Why did the mix precipitate (presumably de-emulsify) after being microwaved but not occur when blended?