In analogy to piezoelectric materials, where the application of an electrical field creates mechanical deformation in the material, I have the following question.
Are there solid materials whose porosity can be altered or controlled?
Of course, I have googled this. This lead me to a lot of websites where controllable porosity means that the porosity of a material is very-well defined when it is produced. This is not what I am looking for. I am looking for a material that can alter its porosity according to an external control quantity, such as electric voltage.