Method for production of three-dimensional closed graphene-based nano-/microstructures

A production method for obtainment of three-dimensional closed graphene-based nano-/microstructures (10) using a coaxial multilayer core-shell production process (1000) comprising a coaxial flow system (100) having a first flow path (101) and a first fluid exit (1011) at an end of said first flow path;

• and a second flow path (102) circumferentially surrounding said first flow path (101), said second flow path having a second fluid exit (1021), wherein
• a first fluid (1) flows through the first flow path and exits through the first fluid exit (1011);
• a second fluid (2) which is immiscible with the first fluid (1) under the conditions where said production method is conducted, flows through the second flow path (102) and exits through the second fluid exit (1021) such that the second fluid (2) circumferentially covers the first fluid (1) upon leaving the coaxial flow system (100);
• said second fluid (2) comprises a graphene-based material, a polymeric material and solvent;
• and
• said graphene-based material is one or more substance selected from the list consisting of graphene oxide, microwave exfoliated graphite oxide, thermally exfoliated graphene oxide, and functionalized graphene.