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International audienceWe report a process for preparing microdot arrays of SiO2 from a tetraethoxysilane precursor containing either a cationic (CTAB) or non-ionic surfactant. Controlling the ink jet deposition parameters and precursor hydrolysis made it possible to obtain mesoporous silica with a Pm3n cubic structure, using CTAB, or an Fmmm orthorhombic structure, using a nonionic surfactant. The addition of hydrophobic organosilane F3C(CF2 )5CH2CH2Si(OC2H5 )3 leads to the most regular and best-defined three-dimensional microdot array with a constant diameter of 155 lm and a regular space of 250 lm

International audienceFilament growth and breakup are investigated in the context of ceramic inkjet printing. Several inks were formulated and ejected on a printer dedicated to ceramic materials. They consisted of six colloidal inks, four simple fluids and two graphic inks. For each, stroboscopic snapshots were acquired and the filament shape was extracted and analysed, for different nozzle actuation pulses. The filament length and the thread minimum radius were measured during the ejection process. A scaling of the breakup time with the Rayleigh number was obtained, as well as a general behaviour for the filament growth rate during the ejection process