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A sandwich panel heat pipe with a three-dimensional ordered open-cellular micro-truss core and a method creating the same. In one embodiment, the sandwich panel heat pipe includes a first face sheet, a second face sheet, the three-dimensional ordered open-cellular micro-truss core between the first

A sandwich panel heat pipe with a three-dimensional ordered open-cellular micro-truss core and a method creating the same. In one embodiment, the sandwich panel heat pipe includes a first face sheet, a second face sheet, the three-dimensional ordered open-cellular micro-truss core between the first face sheet and the second face sheet, and a working fluid in the ordered open-cellular micro-truss core. Here, the three-dimensional ordered open-cellular micro-truss core includes a vapor region and a liquid region, the vapor region is for transporting a vapor phase portion of the working fluid to the liquid region, and the liquid region is for transporting a liquid phase portion of the working fluid to the vapor region.

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1. A sandwich panel heat pipe for transferring heat between a higher temperature region and a lower temperature region, the sandwich panel heat pipe comprising: a first face sheet;a second face sheet;a three-dimensional ordered open-cellular micro-truss core between the first face sheet and the seco

1. A sandwich panel heat pipe for transferring heat between a higher temperature region and a lower temperature region, the sandwich panel heat pipe comprising: a first face sheet;a second face sheet;a three-dimensional ordered open-cellular micro-truss core between the first face sheet and the second face sheet;a working fluid in the ordered open-cellular micro-truss core,the three-dimensional ordered open-cellular micro-truss core comprising a vapor region and a liquid region,the vapor region being for transporting a vapor phase portion of the working fluid from the higher temperature region to the lower temperature region, andthe liquid region being for transporting a liquid phase portion of the working fluid from the lower temperature region to the higher temperature region; anda mesh structure configured to separate the vapor region from the liquid region and having pores smaller than the liquid region and the vapor region; wherein: the three-dimensional ordered open-cellular micro-truss core comprises a plurality of first truss elements extending along a first direction; a plurality of second truss elements extending along a second direction; and a plurality of third truss elements extending along a third direction, andthe first, second, and third ordered truss elements interpenetrate each other at a plurality of nodes to form a continuous material having a plurality of unit cells and some of the first, second, and third ordered truss elements interpenetrate the mesh structure. 2. The sandwich panel heat pipe of claim 1, wherein the three-dimensional ordered open-cellular micro-truss core comprises a three-dimensional ordered open-cellular micro-truss metal material. 3. The sandwich panel heat pipe of claim 1, wherein the three-dimensional ordered open-cellular micro-truss core comprises a plurality of mechanical members having a three-dimensional order with a size scale between about 30 μm and about 5 mm. 4. The sandwich panel heat pipe of claim 1, wherein the three-dimensional ordered open-cellular micro-truss core comprises a plurality of mechanical members having a three-dimensional order with a size scale between about 30 μm and about 1 mm. 5. The sandwich panel heat pipe of claim 1, wherein the vapor region has a unit cell size larger than that of the liquid region. 6. The sandwich panel heat pipe of claim 1, wherein: the liquid region comprises a first outer layer and a second outer layer, andthe vapor region comprises an inner layer between the first outer layer and the second outer layer. 7. The sandwich panel heat pipe of claim 6, wherein the inner layer has a unit cell size larger than that of the first and second outer layers. 8. The sandwich panel heat pipe of claim 1, wherein the three-dimensional ordered open-cellular micro-truss core is a single layer having substantially identical unit cells with channels cut in it as the vapor region of the three-dimensional ordered open-cellular micro-truss core. 9. The sandwich panel heat pipe of claim 8, wherein the liquid region is composed of the remaining portions of the single layer other than the channels. 10. The sandwich panel heat pipe of claim 1, wherein the mesh structure is a mesh. 11. The sandwich panel heat pipe of claim 10, wherein the mesh is a stainless steel mesh. 12. The sandwich panel heat pipe of claim 1, wherein the three-dimensional ordered open-cellular micro-truss core can be configured based on materials and dimensions. 13. The sandwich panel heat pipe of claim 1, wherein the three-dimensional ordered open-cellular micro-truss comprises a metal, a polymer, a ceramic, a glass, or a combination thereof. 14. The sandwich panel heat pipe of claim 1, wherein the first and second face sheets comprise a metal, a polymer, a ceramic, a glass, or a combination thereof. 15. The sandwich panel heat pipe of claim 1, wherein the working fluid comprises helium, nitrogen, water, ammonia, acetone, toluene, hydrocarbons, fluorinated hydrocarbons, an alcohol, a molten metal or a combination thereof. 16. A sandwich panel heat pipe for transferring heat between a higher temperature region and a lower temperature region, the sandwich panel heat pipe comprising: a first face sheet;a second face sheet;a three-dimensional ordered open-cellular micro-truss core between the first face sheet and the second face sheet; anda working fluid in the ordered open-cellular micro-truss core,the three-dimensional ordered open-cellular micro-truss core comprising a vapor region and a liquid region,the vapor region being for transporting a vapor phase portion of the working fluid from the higher temperature region to the lower temperature region, andthe liquid region being for transporting a liquid phase portion of the working fluid from the lower temperature region to the higher temperature region,a mesh structure configured to separate the vapor region from the liquid region and having pores smaller than the liquid region and vapor regionwherein the three-dimensional ordered open-cellular micro-truss core comprises:a plurality of first truss elements defined by a plurality of first self-propagating polymer waveguides and extending along a first direction;a plurality of second truss elements defined by a plurality of second self-propagating polymer waveguides and extending along a second direction; anda plurality of third truss elements defined by a plurality of third self-propagating polymer waveguides and extending along a third direction,wherein the first, second, and third ordered truss elements interpenetrate each other at a plurality of nodes to form a continuous material having a plurality of unit cells and some of the first, second, and third ordered truss elements interpenetrate the mesh structure. 17. The sandwich panel heat pipe of claim 1, wherein the three-dimensional ordered open-cellular micro-truss core comprises: a first three-dimensional pattern; anda second three-dimensional pattern differing from the first three-dimensional pattern. 18. The sandwich panel heat pipe of claim 17, wherein the first and second three-dimensional patterns have order in three dimensions. 19. A sandwich panel heat pipe for transferring heat between a higher temperature region and a lower temperature region, the sandwich panel heat pipe comprising: a first face sheet;a second face sheet;a three-dimensional ordered open-cellular micro-truss core between the first face sheet and the second face sheet; anda working fluid in the ordered open-cellular micro-truss core,the three-dimensional ordered open-cellular micro-truss core comprising a vapor region and a liquid region,the vapor region being for transporting a vapor phase portion of the working fluid from the higher temperature region to the lower temperature region, andthe liquid region being for transporting a liquid phase portion of the working fluid from the lower temperature region to the higher temperature region,wherein the three-dimensional ordered open-cellular micro-truss core comprises:a first three-dimensional pattern; anda second three-dimensional pattern differing from the first three-dimensional pattern,wherein the first and second three-dimensional patterns have order in three dimensions, andwherein the three-dimensional ordered open-cellular micro-truss core further comprises:a plurality of first truss elements defined by a plurality of first self-propagating polymer waveguides of the first three-dimensional pattern and extending along a first direction;a plurality of second truss elements defined by a plurality of second self-propagating polymer waveguides of the first three-dimensional pattern and extending along a second direction;a plurality of third truss elements defined by a plurality of third self-propagating polymer waveguides of the first three-dimensional pattern and extending along a third direction;a plurality of fourth truss elements defined by a plurality of fourth self-propagating polymer waveguides of the second three-dimensional pattern and extending along a fourth direction;a plurality of fifth truss elements defined by a plurality of fifth self-propagating polymer waveguides of the second three-dimensional pattern and extending along a fifth direction;a plurality of sixth truss elements defined by a plurality of sixth self-propagating polymer waveguides of the second three-dimensional pattern and extending along a sixth direction; andan interface,wherein the first, second, and third truss elements interpenetrate each other at a plurality of first nodes to form a first continuous material, wherein the fourth, fifth, and sixth truss elements interpenetrate each other at a plurality of second nodes to form a second continuous material, and wherein the interface comprises a plurality of third nodes for connecting the first continuous material to the second continuous material. 20. The sandwich panel heat pipe of claim 1, further comprising a panel edge terminator for bonding the first and second face sheets together. 21. The sandwich panel heat pipe of claim 1, further comprising a first connection between the three-dimensional ordered open-cellular micro-truss core and the first face sheet, and a second connection between the three-dimensional ordered open-cellular micro-truss core and the second face sheet. 22. The sandwich panel heat pipe of claim 1, further comprising a plurality of fourth truss elements extending along a fourth direction, wherein the first, second, third, and fourth ordered truss elements interpenetrate each other at the plurality of nodes to form the continuous material having the plurality of unit cells.