The high internal phase emulsions (HIPEs) are suitable for 3D printing because of their good self-supporting and shear-thinning. However, the HIPEs prepared from single unmodified casein showed bad self-supporting and could not be used for 3D printing. Therefore, the rice starch/casein complex (SC) was prepared and used in the HIPEs for 3D printing. The SC was treated at different hydrothermal temperatures (60, 80, and 100 °C), and FTIR, XRD, and DSC confirmed the formation of SC by hydrogen bonds. The DSC, apparent viscosity, and microstructure revealed the degree of gelatinization of SC, which affected the properties of the HIPEs. When the degree of gelatinization of SC increased from 12.35% to 70.62%, the HIPEs prepared from the SC treated at 100 °C for 1 h had higher storage modulus, viscosity, and three-interval thixotropy , including lower frequency dependence, which showed the desirable 3D-printing qualities, that is, easy extrusion, stable recovery, and self-supporting. The storage stability of HIPEs prepared from SC showed stable storage at low temperatures (4 °C > 25 °C). These results suggest that rice starch/casein with a higher degree of gelatinization could be used to prepare HIPEs with good 3D-printing characteristics. Furthermore, the developed HIPEs could be applied for 3D printing of foods with the personalized shape.
Cordierite precursor pastes including talc, alumina and silica particles were successfully prepared to fabricate porous cordierite ceramics by supportless stereolithography (SLA). To combining the printability and self-supportability properties of the pastes, the effects of the type and content of the dispersant on the rheological behavior were systematically investigated. Additionally, the effects of solid loading and plasticizer type on the rheological behavior of the cordierite precursor pastes were studied. It was found that 1 wt% Span80 was optimal for modifying the rheological behavior of the cordierite precursor pastes. Furthermore, the results indicated that the printability deteriorated, and the hysteresis area and yield stress of the cordierite precursor pastes increased rapidly when the solid loading exceeded 33 vol%. With the addition of 18 vol% plasticizers to replace UV-curing resins, dibutyl phthalate (DBP) was more effective in improving the printability of cordierite precursor pastes and ensuring self-supportability, compared with the polyethylene glycol 400 (PEG400). Finally, using the optimized cordierite precursor pastes, the porous cordierite ceramics with custom structures were successfully prepared.
危险品化学品经营许可证（带存储）