Mielonen Katriina, Geydt Pavel, Österberg Monika, Johansson Leena-Sisko, Backfolk Kaj
Lappeenranta University of Technology, Packaging Technology, P.O. Box 20, FI-53851 Lappeenranta, Finland.
Lappeenranta University of Technology, Laboratory of Physics, P.O. Box 20, FI-53851 Lappeenranta, Finland.
J Colloid Interface Sci. 2015 Jan 15;438:179-190. doi: 10.1016/j.jcis.2014.09.077. Epub 2014 Oct 7.
Mechanisms of inkjet ink spreading and absorption on a coated paper have been studied using a polyelectrolyte multilayering technique. By applying alternating sequences of cationic and anionic polyelectrolyte layers on a mineral coated paper, the role of the interfacial chemistry was evaluated. The polyelectrolyte multilayer was created to imitate a thin resin-like liquid-absorptive layer and to clarify the role of the charge of the protruding polyelectrolyte layer on ink spreading and colorant fixation. The formation of a thin polyelectrolyte layer and coating coverage was confirmed by X-ray photoelectron spectroscopy (XPS). A submolecular mechanical imaging of the polyelectrolyte complexes with an atomic force microscope (AFM) revealed differences in modulus and different nanosize agglomerates were identified which were ascribed to polyion complexes. The polyelectrolyte coatings significantly affect the solid-liquid interaction and particularly the ink spreading revealed as intercolor bleeding and wicking. The interfacial interaction between the ink and the applied polyelectrolyte layers showed differences between dye- and pigment-based colorants, which could be emphasized by the polyelectrolyte chemistry.
采用聚电解质多层技术研究了喷墨油墨在涂布纸上的铺展和吸收机理。通过在矿物涂布纸上交替施加阳离子和阴离子聚电解质层，评估了界面化学的作用。制备聚电解质多层膜以模拟薄的树脂状液体吸收层，并阐明突出的聚电解质层电荷对油墨铺展和着色剂固着的作用。通过X射线光电子能谱（XPS）确认了薄聚电解质层的形成和涂层覆盖率。用原子力显微镜（AFM）对聚电解质复合物进行的亚分子力学成像揭示了模量的差异，并识别出不同的纳米尺寸团聚体，这些团聚体归因于聚离子复合物。聚电解质涂层显著影响固液相互作用，尤其是表现为颜色渗色和芯吸的油墨铺展。油墨与所施加的聚电解质层之间的界面相互作用在基于染料和颜料的着色剂之间表现出差异，这可以通过聚电解质化学来突出。
