In this work, generalized (2D-COS) and perturbation-correlation moving window (PCMW2D) two-dimensional correlation analyses were applied on a set of hydration-dependent Fourier Transform Infrared Spectroscopy in Attenuated Total Reflectance Geometry (FTIR-ATR) data of cellulose nano-sponges (CNSs) consisting of TEMPO-oxidized cellulose nanofibrils (TOCNF) as three-dimensional scaffolds, and branched polyethyleneimine (bPEI) as cross-linker. The aim was to get insights, starting from the computation of synchronous (SCMs) and asynchronous (ACMs) 2D-COS and PCMW2D correlation maps, into the effect of hydration on the hydrogen bond (H-bond) dynamics of water molecules closely attached to the cellulose nanofibrils (interfacial water), based on the assessment of the complex sequence of events affecting the O–H modes of the CNS material at different bPEI:TOCNF (w/w) ratios. The possibility to highlight the time-dependent dynamical evolution exhibited by complex cellulose-based materials, not accessible through conventional 1D FTIR-ATR analysis, can provide useful notions for the development and optimization of CNSs-based devices for different applications, including water remediation, drug-delivery and heterogeneous catalysis.

在这项工作中，将广义 (2D-COS) 和扰动相关移动窗口 (PCMW2D) 二维相关分析应用于纤维素的衰减全反射几何 (FTIR-ATR) 数据中的一组水合依赖性傅里叶变换红外光谱 (FTIR-ATR) 数据纳米海绵（CNS）由TEMPO氧化纤维素纳米原纤维（TOCNF）作为三维支架和支化聚乙烯亚胺（bPEI）作为交联剂组成。目的是从同步 (SCM) 和异步 (ACM) 2D-COS 和 PCMW2D 相关图的计算开始，深入了解水合对紧密附着的水分子的氢键 (H 键) 动力学的影响。纤维素纳米原纤维（界面水），基于对不同 bPEI:TOCNF (w/w) 比率下影响 CNS 材料 O-H 模式的复杂事件序列的评估。强调复杂纤维素基材料所表现出的随时间变化的动态演化的可能性，这是通过传统的 1D FTIR-ATR 分析无法实现的，可以为开发和优化不同应用的基于 CNS 的设备提供有用的概念，包括水修复、药物递送和多相催化。