Hollow polymer micro-truss structures containing pressurized fluids

A hollow micro-truss comprising:

• at least three sets of continuous interconnected hollow tubes extending along at least three different directions;
• and
• a face sheet at one side of the interconnected hollow tubes,
• the at least three sets of interconnected hollow tubes interpenetrating each other at a plurality of hollow nodes extending along different directions, one of the directions not being in a plane defined by one or more of the other directions, to form a self-supporting structure,
• the at least three sets of interconnected hollow tubes having walls,
• an inner diameter of the hollow tubes is at least 10 microns and at most 2 millimeters,
• an interior of the hollow tubes defined by the walls being in fluid communication with each other at the hollow nodes to form a continuous interior fluid volume,
• at least some of the interconnected hollow tubes terminating at fluid access ports to provide fluid communication between the continuous interior fluid volume and outside the interconnected hollow tubes,
• the face sheet comprising a channel fluidly connecting at least two of the fluid access ports of the interconnected hollow tubes to each other,
• the continuous interior fluid volume configured to be filled with a gas at higher pressure than an exterior fluid volume, and
• the hollow micro-truss being a regular hollow polymer micro-truss.