Lin Dandan, Liu Tan, Yuan Qingqing, Yang Hongkun, Ma Hongyang, Shi Shaowei, Wang Dong, Russell Thomas P
Beijing Advanced Innovation Center for Soft Matter Science and Engineering & State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China.
Polymer Science and Engineering Department, University of Massachusetts Amherst, Amherst, Massachusetts 01003, United States.
ACS Appl Mater Interfaces. 2020 Dec 9;12(49):55426-55433. doi: 10.1021/acsami.0c16602. Epub 2020 Nov 23.
The assembly and binding of nanoparticles at the interfaces of aqueous two-phase systems enable the three-dimensional (3D) printing of all-aqueous naturally occurring materials. When a dispersion of cellulose nanocrystals (CNCs) in an aqueous solution of polyethylene glycol (PEG) is brought into contact with chitosan dissolved in an aqueous solution of dextran, the CNCs and chitosan diffuse to the interface between the two immiscible aqueous solutions, electrostatically interact, and form a solid, membranous layer sufficiently rapidly to 3D print tubules of one liquid in the other. The diameter, length, spatial arrangement, and stability of the printed tubules can be broadly controlled. Adsorption and directional diffusion of ionic species across the membranous layer make heavy metal ion removal possible. The results present a platform for fabricating and developing all-aqueous compartmentalized systems where function can be independently coupled to the inherent functionality of the nanoparticles or ligands.
纳米颗粒在双水相系统界面处的组装和结合，使得全水性天然材料的三维（3D）打印成为可能。当纤维素纳米晶体（CNC）在聚乙二醇（PEG）水溶液中的分散体与溶解在葡聚糖水溶液中的壳聚糖接触时，CNC和壳聚糖扩散到两种不混溶水溶液之间的界面，发生静电相互作用，并足够迅速地形成一个固体膜层，从而能够在另一种液体中3D打印出一种液体的微管。打印微管的直径、长度、空间排列和稳定性可以得到广泛控制。离子物种在膜层上的吸附和定向扩散使得重金属离子去除成为可能。这些结果为制造和开发全水性分隔系统提供了一个平台，在该系统中，功能可以独立地与纳米颗粒或配体的固有功能相结合。
