Production of titania ink
The sol prepared as described above was evaporated on a rotary evaporator to get xerogel. 0.4 g of solid (xerogel) sample was dissolved in 2 mL deionized water. Then 2 ml of the resulting sol was mixed with 6 ml of ethylene glycol, and the viscosity of the solution increased from 1.5 to 9.3 cP. To adjust the surface tension 6 µl of 1% solution of surfactant DX4010N was added to the resulting titania solution. The surface tension was reduced from 45.7 to 30 mN•m−1. Finished ink have been tested for printing reproducibility (latency test) by Dimatix material printer DMP 2831. The ink has latency time up then 5 minute and jetting frequency from 1 to 5 KHz.