Can Ferrofluids vaporise to gaseous state and Condense back to liquid state and do it many times over?
Part of the ferrofluid could theoretically be vaporized. As ferrofluid is made from tiny magnetic particles(eg. iron powder coated with a surfactant to inhibit clumping) suspended in a fluid. The fluid can be organic solvents, water and most commonly ink. Some of these fluids can evaporate and recondense. However, as a whole ferrofluid, cannot be vaporized. You can imagine ferrofluid as a cup of mixed sand and water that wouldn't settle(suspended).