Is there a liquid crystal or similar material that gets cloudy when an electric field is applied, but is otherwise clear? Is there a way to make a liquid, such as a liquid crystal material, transition from cloudy or clear and vice-versa using only electric current?

By cloudy, I mean, similar to the effect that cholesterol or 5CB exhibits, thermally.

If so, where could this be obtained, and how quickly does it switch between states?

If not, how else might such an effect be achieved using electric current? I've read about the Kerr effect, but it didn't change opacity so much as refractive index, and it also appeared to use a great deal of electricity. I'm thinking something within the single volts.
Electrochromic materials are produced for this purpose and are typically sold as “smart glass”.