This study aimed to prepare and characterize water-soluble chitosan-graphene oxide-silver nanoparticles (CS-GO-AgNP) fluids for 3D-inkjet printing of filtration membranes and to investigate the effects of Dimethylacetamide (DMAc) used as a co-solvent on the rheological properties and printability of the modified chitosan fluids. DMAc concentration increase affected rheological characteristics of CS, resulting to a reduction in particle size distribution. The dynamic viscosity and shear stress of the ink reduced with increase in DMAc concentration, temperature and decrease in the mole fraction of chitosan. Surface tension of the fluid increased as the co-solvent concentration increased, indicating a greater number of bond donor sites as a result of stronger hydrogen bond affinity of DMAc and increased molecular interactions with amide groups of CS. The optimal printability and drop formation of the modified CS ink were determined to be 63.8 mN/m (surface tension), 0.0105 Pas (viscosity), 1087 Kg/m³ (density), and a Z-value of 6.1.

中文翻译：

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二甲基乙酰胺对用于水过滤膜 3D 打印的壳聚糖/AgNP/GO 流体特性的影响

本研究旨在制备和表征用于过滤膜 3D 喷墨打印的水溶性壳聚糖-氧化石墨烯-银纳米粒子 (CS-GO-AgNP) 流体，并研究用作助溶剂的二甲基乙酰胺 (DMAc) 对过滤膜的影响改性壳聚糖液的流变学特性和印刷适性。DMAc 浓度增加影响了 CS 的流变学特性，导致粒度分布减小。油墨的动态粘度和剪切应力随着DMAc浓度、温度的升高和壳聚糖摩尔分数的降低而降低。流体的表面张力随着共溶剂浓度的增加而增加，表明由于 DMAc 的氢键亲和力更强以及与 CS 的酰胺基团的分子相互作用增加，键供体位点的数量更多。³（密度），Z值为 6.1。