Base-catalyzed sol-gel inks for direct ink writing of high resolution hierarchically porous carbon aerogels
An aerogel includes a three-dimensional printed structure having printed ligaments geometrically arranged, where an average diameter of the printed ligaments is in a range of greater than 0 microns and less than 50 microns. In addition, an average distance between a center of a first of the printed ligaments and a center of a second of the printed ligaments is at least equal to the average diameter of the printed ligaments, where the first and the second of the printed ligaments are adjacent. Each printed ligament includes of a plurality of random pores, where an average diameter of the random pores is less than 50 nanometers.
1. An aerogel, comprising:
a three-dimensional printed structure having printed ligaments geometrically arranged,
wherein an average diameter of the printed ligaments is in a range of greater than 0 microns and less than 50 microns,
wherein an average distance between a center of a first of the printed ligaments and a center of a second of the printed ligaments is at least equal to the average diameter of the printed ligaments, wherein the first and the second of the printed ligaments are adjacent,
wherein each printed ligament is comprised of a plurality of random pores, wherein an average diameter of the random pores is less than 50 nanometers,
wherein an average diameter of the random pores located on a surface of the printed ligaments is substantially equal to an average diameter of random pores located throughout an inside area of each of the printed ligaments, wherein the inside area is located between each surface of each of the printed ligaments.
2. An aerogel as recited in claim 1 , wherein the average distance between the center of the first of the printed ligaments and the center of the second of the printed ligaments is in a range of greater than 100 microns to less than 1 millimeter.
3. An aerogel as recited in claim 1 , wherein the average diameter of the printed ligaments is in a range of greater than 0 microns to less than 10 microns.
4. An aerogel as recited in claim 1 comprising a plurality of non-random pores, wherein the non-random pores have an average diameter in a range of greater than 0 microns to less than 50 microns.
5. An aerogel as recited in claim 4 , wherein the average diameter of the non-random pores is in a range of greater than 0 microns to less than 10 microns.
6. An aerogel as recited in claim 1 , where in the aerogel is a carbon aerogel.
7. An aerogel as recited in claim 6 , wherein the printed ligaments comprise carbon particles, wherein an average diameter of the carbon particles is in a range of greater than 1 nanometer to 30 nanometers.
8. An aerogel as recited in claim 6 , wherein the average diameter of the random pores of each of the printed ligaments is less than 10 nanometers.
9. An aerogel as recited in claim 6 , comprising a metal oxide.
10. A method of forming the aerogel of claim 1 , the method comprising:
extruding an ink from a nozzle to form a printed three-dimensional structure, the
ink comprising:
a base catalyst,
a sol-gel precursor composition, and
a block copolymer;
causing the printed three-dimensional structure to gel thereby forming a wet gel printed three-dimensional structure;
drying the wet gel printed three-dimensional structure; and
applying thermal treatment to the dried printed three-dimensional structure to form a carbon aerogel.
11. A method as recited in claim 10 , wherein a metal oxide is added to the nozzle simultaneously as the ink.
12. A method as recited in claim 10 , wherein the nozzle has a diameter in a range of greater than 25 microns to less than 500 microns.
13. A method as recited in claim 10 , wherein the nozzle has a diameter in a range of greater than 25 microns to less than 200 microns.