Zhu Qianqian, Zhou Rui, Liu Jun, Sun Jianzhong, Wang Qianqian
Biofuels Institute, School of the Environment and Safety Engineering, Jiangsu University, Zhenjiang 212013, China.
Key Laboratory of Biomass Energy and Material, Institute of Chemical Industry of Forest Products,Chinese Academy of Forestry, Nanjing 210042, China.
Nanomaterials (Basel). 2021 May 20;11(5):1353. doi: 10.3390/nano11051353.
Researches of cellulose nanomaterials have seen nearly exponential growth over the past several decades for versatile applications. The characterization of nanostructural arrangement and local chemical distribution is critical to understand their role when developing cellulose materials. However, with the development of current characterization methods, the simultaneous morphological and chemical characterization of cellulose materials at nanoscale resolution is still challenging. Two fundamentally different nanoscale infrared spectroscopic techniques, namely atomic force microscope based infrared spectroscopy (AFM-IR) and infrared scattering scanning near field optical microscopy (IR s-SNOM), have been established by the integration of AFM with IR spectroscopy to realize nanoscale spatially resolved imaging for both morphological and chemical information. This review aims to summarize and highlight the recent developments in the applications of current state-of-the-art nanoscale IR spectroscopy and imaging to cellulose materials. It briefly outlines the basic principles of AFM-IR and IR s-SNOM, as well as their advantages and limitations to characterize cellulose materials. The uses of AFM-IR and IR s-SNOM for the understanding and development of cellulose materials, including cellulose nanomaterials, cellulose nanocomposites, and plant cell walls, are extensively summarized and discussed. The prospects of future developments in cellulose materials characterization are provided in the final part.
在过去几十年中，纤维素纳米材料的研究因其广泛的应用而呈现出近乎指数级的增长。纳米结构排列和局部化学分布的表征对于理解纤维素材料在开发过程中的作用至关重要。然而，随着当前表征方法的发展，在纳米尺度分辨率下对纤维素材料进行形态和化学的同步表征仍然具有挑战性。通过将原子力显微镜（AFM）与红外光谱相结合，建立了两种根本不同的纳米级红外光谱技术，即基于原子力显微镜的红外光谱（AFM-IR）和红外散射扫描近场光学显微镜（IR s-SNOM），以实现对形态和化学信息的纳米级空间分辨成像。本综述旨在总结和突出当前最先进的纳米级红外光谱和成像技术在纤维素材料应用方面的最新进展。简要概述了AFM-IR和IR s-SNOM的基本原理，以及它们在表征纤维素材料时的优缺点。广泛总结和讨论了AFM-IR和IR s-SNOM在理解和开发纤维素材料（包括纤维素纳米材料、纤维素纳米复合材料和植物细胞壁）方面的应用。最后一部分给出了纤维素材料表征未来发展的前景。
