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研究了直流电压对无颗粒纳米银导电墨水在电流体动力(EHD)近场微喷印中喷射行为的影响.结果表明供墨压力和电极间距一定时,随着直流电压增大,喷嘴尖端弯液面拉长,轮廓由曲面先后演变为脉动泰勒锥和稳定泰勒锥状.直流电压过大导致泰勒锥失稳倾斜.在不同弯液面形状下,墨滴喷射方式依次为:脉动微滴落、脉动锥射流、稳定锥射流、多股锥射流.在1 500～3 500 V内锥射流较稳定,且该范围内随着直流电压升高,泰勒锥高度减小,锥尖角度增大.基板移动速度一定时,随着直流电压增大,基板上沉积的线条连续性增强,线条宽度增加.供墨压力增大使上述喷射模式的诱导直流电压降低,但射流更易失稳,导致喷印质量下降.“,”The effect of the DC voltage on the jetting behavior of the non-particle nano Ag conductive ink during electrohydrodynamics (EHD) near-field micro jet printing was investigated.The experiment results show that under the certain ink supply pressure and electrode spacing,the meniscus on the nozzle tip is elongated with the increase of the DC voltage,and the side profile of the meniscus evolves from the curve to the pulsant Taylor cone and then to the stable Taylor cone.The excessive DC voltage resulted in the unstable and slant Taylor cone.The jetting behavior of the ink droplet in different meniscus shapes presents,in order,the pulsant micro dripping,pulsant Taylor cone jetting,stable cone jetting and multi cone jetting.In the DC voltage range of 1 500-3 500 V,the Taylor cone jetting is stable,the height of the Taylor cone decreases and the angle of cone tip increases with the increase of the DC voltage.Under the certain moving speed of the substrate,the continuity and line width of the deposited lines on the substrate increase with the increase of the DC voltage.The increase of the ink supply pressure resuits in the decrease of the induction DC voltages for the above jetting modes and the unstable jetting,thus the decrease of jet printing quality.