Abstract：
Significant challenges remain in designing sufficient viscoelasticity polysaccharide-based high internal phase Pickering emulsions (HIPPEs) as soft materials for 3D printing. Herein, taking advantage of the interfacial covalent bond interaction between modified alginate (Ugi-OA) dissolved in the aqueous phase and aminated silica nanoparticles (ASNs) dispersed in oil, HIPPEs with printability were obtained. Using multitechniques coupling a conventional rheometer with a quartz crystal microbalance with dissipation monitoring, the correlation between interfacial recognition coassembly on the molecular scale and the stability of whole bulk HIPPEs on the macroscopic scale can be clarified. The results showed that Ugi-OA/ASNs assemblies (NPSs) were strongly retargeted into the oil-water interface due to the specific Schiff base-binding between ASNs and Ugi-OA, further forming thicker and more rigid interfacial films on the microscopic scale compared with that of the Ugi-OA/SNs (bared silica nanoparticles) system. Meanwhile, flexible polysaccharides also formed a 3D network that suppressed the motion of the droplets and particles in the continuous phase, endowing the emulsion with appropriately viscoelasticity to manufacture a sophisticated \"snowflake\" architecture. In addition, this study opens a novel pathway for the construction of structured all-liquid systems by introducing an interfacial covalent recognition-mediated coassembly strategy, showing promising applications.
摘要：
在设计足够粘弹性的基于多糖的高内相Pickering乳液(HIPPE)作为用于3D打印的软材料方面仍然存在重大挑战。在这里，利用溶解在水相中的改性藻酸盐（Ugi-OA）和分散在油中的胺化二氧化硅纳米颗粒（ASN）之间的界面共价键相互作用，获得了具有可印刷性的HIPPE。使用多种技术将常规流变仪与石英晶体微天平耦合，并进行耗散监测，可以阐明分子尺度上的界面识别共组装与宏观尺度上整体HIPPE的稳定性之间的相关性。结果表明，由于ASN和Ugi-OA之间的特定席夫碱结合，Ugi-OA/ASNs组件（NPSs）被强烈地重定向到油-水界面，与Ugi-OA/SNs（裸露的二氧化硅纳米颗粒）系统相比，在微观尺度上进一步形成更厚和更刚性的界面膜。同时,柔性多糖还形成了3D网络，抑制了液滴和颗粒在连续相中的运动，赋予乳液适当的粘弹性，以制造复杂的“雪花”结构。此外,这项研究通过引入界面共价识别介导的共组装策略，为构建结构化的全液体系统开辟了一条新途径，显示有希望的应用。
