A simple ER fluid can be made by mixing cornflour in a light vegetable oil or (better) silicone oil. There are two main theories to explain the effect: the interfacial tension or ‘water bridge’ theory, and the electrostatic theory.Click to see full answer. Just so, how are ferrofluids made?Ferrofluid. Ferrofluids are made up of tiny magnetic fragments of iron suspended in oil (often kerosene) with a surfactant to prevent clumping (usually oleic acid). The oily fluid prevents debris from entering hard drives when a small amount is placed between the magnets and shaft.Beside above, what is electro Rheostatic? Electro-rheostatic and Magneto-rheostatic. Electro-rheostatic (ER) and magneto-rheostatic (MR) materials are fluids, which can experience a dramatic change in their viscosity. ER fluids have mainly been developed for use in clutches and valves, as well as engine mounts designed to reduce noise and vibration in vehicles Considering this, is ferrofluid a solution? A ferrofluid is a colloidal suspension. They remain suspended within the solution. With the ferrofluid solution, you might expect the magnetic particles to settle down due to gravity eventually.What liquids are magnetic?A typical magnetic liquid is a colloidal suspension of single domain magnetic particles like magnetite of diameter about 10 nm in a nonmagnetic carrier fluid like water or kerosene.