Method for using a poisson ratio material

A method for using a Poisson's ratio material, comprising:

• providing the Poisson's ratio material, wherein the Poisson's ratio material comprises:
• a flexible polymer matrix;
• and
• a carbon nanotube film structure disposed in the flexible polymer matrix, the carbon nanotube film structure comprising a plurality of carbon nanotubes, wherein a first part of the carbon nanotubes is aligned along a first direction, a second part of the carbon nanotubes is aligned along a second direction, and the first direction is substantially perpendicular to the second direction;
• and
• stretching or compressing the poisson's ratio material in a direction having an angle of about 45 degrees relative to the first direction.

A method for using a Poisson's ratio material, comprising:

• providing the Poisson's ratio material, wherein the Poisson's ratio material comprises:
• a first characteristic direction;
• a second characteristic direction that is substantially perpendicular to the first characteristic direction;
• a third characteristic direction having an angle of about 45 degrees in relation to the first characteristic direction;
• a plurality of first films formed from a plurality of first carbon nanotubes aligned in the first characteristic direction;
• a plurality of second films formed from a plurality of second carbon nanotubes aligned in the second characteristic direction;
• a polydimethylsiloxane matrix, wherein the pluralities of first films and second films are disposed in the polydimethylsiloxane matrix;
• wherein the plurality of first films and the plurality of second films are alternately arranged and stacked on one another and the plurality of first carbon nanotubes in the plurality of first films are substantially perpendicular to the carbon nanotubes in the second films;
• and
• stretching or compressing the poisson's ratio material in a direction having an angle of about 45 degrees relative to the first characteristic direction.