基于种子介导法的“CNC/CTAB/NaLS”耦合体系对银纳米立方体尺寸的精确调控机制研究

基于生物质材料的“绿色制造”技术已成为基础科学研究的前沿和热点。本项目以金属纳米材料的绿色、高效、可控制备技术需求为导向，针对金属纳米颗粒传统制备方法带来的尺寸不均一、难调控等共性基础问题，独辟蹊径，选择木质纤维原料两大衍生物——纤维素纳米晶和木质素磺酸钠为研究对象，旨在充分利用二者优异的物化特性和协同效应，探索一种精确调控银纳米立方体尺寸的制备方法。首先利用“CNC/CTAB/NaLS”耦合体系对银离子的高效吸附和还原机理，制备尺寸均一可控的纳米银晶种并深入阐释其尺寸调控机制；然后利用种子介导法，在新型结构导向剂CTAB/NaLS的精确调控下，以纳米银晶种为种子合成尺寸均一可控的银纳米立方体，并揭示银纳米立方体在“CNC/CTAB/NaLS”耦合体系中的尺寸调控机制。本项目为木质纤维原料在金属纳米材料制备领域的高值化应用提供理论依据和技术支撑，对推动生物质资源可持续发展具有重要理论意义。

The “green manufacturing” technology based on biomass materials has become the frontier and hotspot of basic scientific research. This project is oriented by the requirements for green, efficient and controllable preparation technology of metal nano-materials, and focused on the common basic problems, such as uneven particle size and hard to be controlled, that have been brought by the traditional methods for metal nanoparticle preparation. It is to develop a new style to select the two main derivatives of lignocellulosic resources, i.e., cellulose nano-crystals (CNC) and sodium lignosulfonate (NaLS) as study objects, aiming to take full advantage of their outstanding physicochemical property and synergistic effect, to explore a preparation method that can accurately control the particle size of silver nanocubes. First, the silver nano-crystal seeds with uniform and controllable particle size will be synthesized and the size controlling mechanism will also be elucidated deeply by applying the efficiency adsorption mechanism and controllable reduction mechanism of “CNC/CTAB/NaLS” coupling system on silver ions. Secondly, the silver nanocubes with uniform and controllable size, that are accurately controlled by the new structure-directing agent CTAB/NaLS, will be prepared via the seed-mediated growth method based on the as-prepared silver nano-seeds, followed by revealing the size control mechanism of “CNC/CTAB/NaLS” coupling system. This project will provide essential theoretical basis and technical support for the high-value applications of lignocellulosic raw materials in the preparation field of noble metal nanomaterials, and bring important theoretical significance to promote the sustainable development of biomass resources.