Triz Principle 31 # Porous materials

Porous material allow some substances through them and block others, which allows them to be used for separating and filtering out desired or undesirable elements. As with mops, they also can be used for absorbing and collecting liquids or gases, which can subsequently be released in a controlled manner as required.

 A. Make an object porous or add porous elements (inserts, coatings, etc.).

  • Drill holes in a structure to reduce the weight.

B. If an object is already porous, use the pores to introduce a useful substance or function.

  • Use a porous metal mesh to wick excess solder away from a joint.
  • Store hydrogen in the pores of a palladium sponge. (Fuel “tank” for the hydrogen car–much safer than storing hydrogen gas)