A Study on Thermal and Nanomechanical Performance of Cellulose Nanomaterials (CNs)
A Study on Thermal and Nanomechanical Performance of Cellulose Nanomaterials (CNs)
复制标题
纤维素纳米材料（CNs）的热性能和纳米机械性能研究
作者：
N. Yildirim;S. Shaler
木基纤维素纳米材料(CNS)(具体地说，纤维素纳米纤维(CNF)和纤维素纳米晶(CNCS))是一种环保的低冲击材料，具有显著的热、力学和物理性能。这种独特性使它们成为制造具有多种属性的纳米复合材料的极佳候选者。研究碳纳米管的形态、热学和纳米力学性能对新型复合材料的智能化开发至关重要。利用配备有纳米压头的原子力显微镜，采用两种分析方法(Oliver Pharr(OP)和熔融SiO_2(FS))研究了CNFS和CNCS的压缩弹性系数。CnC模量值(ECnC-FS=21.1 GPA，ECnC-OP=28.7 GPA)显著大于CNFS(ECNF-FS=12.4 GPA，ECNF-OP=15.1 GPa.)。此外，FS分析方法提供了具有统计学意义的较低估计。用热重分析法研究了碳纳米管和碳纳米管的热稳定性。CNF的起始温度(OnsetCnc=228.2℃，OnsetCNF=279.9℃)、分解温度(DTGACNC=247.9℃，DTGACNF=331.4℃)和残留物(残留CNF=34.4%，残留CNF=22.8%)之间存在显著差异。这项研究丰富了关于纤维素纳米材料热稳定性和纳米力学性能的信息，并为理解碳纳米管作为基质或增强材料在复合材料中的作用提供了更多的知识。
Wood-based cellulose nanomaterials (CNs) (specifically, cellulose nanofibrils (CNFs) and cellulose nanocrystals (CNCs)) are environmentally sourced low-impact materials with remarkable thermal, mechanical, and physical properties. This uniqueness makes them great candidates for creating nanocomposite materials with a wide range of attributes. Investigating the morphological, thermal, and nanomechanical properties of CNs becomes crucial to intelligent development of novel composite materials. An atomic force microscope equipped with a nanoindenter was used to investigate the compression modulus of CNFs and CNCs using two analytical approaches (denoted as Oliver Pharr (OP) and Fused Silica (FS)). The CNC modulus values (ECNC-FS = 21.1 GPa, ECNC-OP = 28.7 GPa) were statistically larger than those obtained from CNFs (ECNF-FS = 12.4 GPa, ECNF-OP = 15.1 GPa). Additionally, the FS analytical approach provided statistically significant lower estimates. Thermal stability of CNFs and CNCs was investigated using thermogravimetric analysis. Significant differences were found between CNF and CNC onset temperatures (OnsetCNC = 228.2 °C, OnsetCNF = 279.9 °C), decomposition temperatures (DTGACNC = 247.9 °C, DTGACNF = 331.4 °C), and residues (ResidueCNC = 34.4%, ResidueCNF = 22.8%). This research enriches the information on thermal stability and nanomechanical performance of cellulose nanomaterials, and provides increased knowledge on understanding the effect of CNs as a matrix or reinforce in composites.