City University of Hong Kong

Guo Liu

Jian Lu

Yan Zhao

The present invention provides a method of in situ 4D printing of high-temperature materials including 3D printing a structure of an ink including a precursor. The structure is treated with controlled high energy flow to create a portion which has a different coefficient of thermal expansion/thermal shrinkage ratio. The structure is heated and the difference in the coefficient of thermal expansion creates an interface stress to cause a selected level of deformation. Alternatively, two structures with different coefficients of expansion/thermal shrinkage ratio may be printed. Thermal treatment of the two structures creates an interface stress to cause a selected level of deformation.

In-situ 4D printing of high-temperature materials

A system and a method for constructing a printed ceramic object, the method including the steps of extruding a substance to generate a 3D-printed elastomeric object; deforming the 3D-printed elastomeric object into a complex structure to form a printed elastomeric origami object; and transforming the printed elastomeric origami object into an aforesaid printed ceramic origami object.

Method for constructing a printed ceramic object and a ceramic object constructed by the same

A system and method of constructing a 4D-printed ceramic object, the method including extruding inks including particles and polymeric patterns through a nozzle to deposit the inks to form a first elastic structure, subjecting the first elastic structure to tensile stress along at least one axis, extruding inks including particles and polymeric patterns through a nozzle to deposit the inks to form a second elastic structure provided to the first elastic structure under tensile stress, releasing the application of tensile stress from the first elastic structure to allow the first elastic structure and second elastic structure to form a 4D-printed elastomeric object, and converting the 4D-printed elastomeric object into the 4D-printed ceramic object.

System and method for four-dimensional printing of elastomer-derived ceramic structures by self-forming method

Systems and method of constructing a 4D-printed ceramic object, the method including extruding inks including particles and polymeric ceramic precursors through a nozzle to deposit the inks to form a first elastic structure and a second elastic structure, subjecting the first elastic structure to a tensile stress along at least one axis, attaching the second elastic structure to the first elastic structure, releasing the application of the tensile stress from the first elastic structure to allow the first elastic structure and second elastic structure to form a 4D-printed elastomeric object, and converting the 4D-printed elastomeric object into the 4D-printed ceramic object.

Systems and method for four-dimensional printing of elastomer-derived ceramic structures by compressive buckling-induced method

A system and method of constructing a 4D-printed ceramic object includes extruding inks including particles and polymeric ceramic precursors through a nozzle to deposit the inks on a heating plate, whereby a 3D-printed elastomeric object is formed on the heating plate, folding the 3D-printed elastomeric object into a complex structure to form a 4D-printed pre-strained elastomeric object, and converting the 4D-printed elastomeric object into the 4D-printed ceramic object.

Growing community of inventors

Hong Kong, China

Guo Liu