Gardini Davide, Dondi Michele, Costa Anna Luisa, Matteucci Francesco, Blosi Magda, Galassi Carmen, Baldi Giovanni, Cinotti Elenia
CNR-ISTEC, Institute of Science and Technology for Ceramics, Via Granarolo 64, 48018 Faenza, Italy.
J Nanosci Nanotechnol. 2008 Apr;8(4):1979-88. doi: 10.1166/jnn.2008.048.
Nano-sized ceramic inks suitable for ink-jet printing have been developed for the four-colours CMYK (cyan, magenta, yellow, black) process. Nano-inks of different pigment composition (Co(1-x)O, Au(0), Ti(1-x-y)Sb(x)Cr(y)O2, CoFe2O4) have been prepared with various solid loadings and their chemicophysical properties (particle size, viscosity, surface tension, zeta-potential) were tailored for the ink-jet application. The pigment particle size is in the 20-80 nm range. All these nano-suspensions are stable for long time (i.e., several months) due to either electrostatic (high zeta-potential values) or steric stabilization mechanisms. Both nanometric size and high stability avoid problems of nozzle clogging from particles agglomeration and settling. Nano-inks have a Newtonian behaviour with relatively low viscosities at room temperature. More concentrated inks fulfil the viscosity requirement of ink-jet applications (i.e., < 35 mPa x s) for printing temperatures in between 30 and 70 degrees C. Surface tension constraints for ink-jet printing are fulfilled by nano-inks, being in the 35-45 mN x m(-1) range. The nano-sized inks investigated behave satisfactorily in preliminary printing tests on several unfired industrial ceramic tiles, developing saturated colours in a wide range of firing temperatures (1000-1200 degrees C).
已开发出适用于喷墨打印的纳米级陶瓷墨水，用于四色CMYK（青色、品红色、黄色、黑色）印刷工艺。制备了具有不同颜料成分（Co(1-x)O、Au(0)、Ti(1-x-y)Sb(x)Cr(y)O2、CoFe2O4）的纳米墨水，并采用了各种固体含量，且针对喷墨应用对其化学物理性质（粒径、粘度、表面张力、zeta电位）进行了调整。颜料粒径在20 - 80纳米范围内。由于静电（高zeta电位值）或空间位阻稳定机制，所有这些纳米悬浮液在很长时间内（即几个月）都是稳定的。纳米尺寸和高稳定性避免了因颗粒团聚和沉降导致的喷嘴堵塞问题。纳米墨水具有牛顿流体行为，在室温下粘度相对较低。更浓缩的墨水在30至70摄氏度的印刷温度下满足喷墨应用的粘度要求（即<35 mPa·s）。纳米墨水满足喷墨打印的表面张力限制，其表面张力在35 - 45 mN·m(-1)范围内。所研究的纳米级墨水在对几块未烧制的工业陶瓷砖进行的初步印刷测试中表现令人满意，在很宽的烧制温度范围（1000 - 1200摄氏度）内呈现出饱和色彩。
