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Atomic Layer Deposition of Metal Oxide on Nanocellulose for Enabling Microscopic Characterization of Polymer Nanocomposites
Small ( IF 13.0 ) Pub Date : 2018-10-16 , DOI: 10.1002/smll.201803439
Athanasia A. Septevani 1, 2 , David A. C. Evans 1 , Alireza Hosseinmardi 1 , Darren J. Martin 1 , John Simonsen 3 , John F. Conley 4 , Pratheep K. Annamalai 1
Affiliation  

Analysis of cellulose nanocrystals (CNCs) at low volume fractions in polymer nanocomposites through conventional electron microscopy still remains a challenge due to insufficient contrast between CNCs and organic polymer matrices. Herein, a methodology for enhancing the contrast of CNC, through atomic layer deposition (ALD) of alumina (Al2O3) on CNCs is demonstrated. The metal oxide coated CNC allows clear visualization by transmission electron microscopy, when they are dispersed in water and polyol. A coating of about 6 ± 1 nm thick alumina layer on the CNC is achieved after 50 ALD cycles. This also enables the characterization of CNC dispersion/orientation (at 0.2 wt% loading) in an amorphous cellular system rigid polyurethane foam (RPUF), using backscattered electron microscopy with energy‐dispersive X‐ray spectroscopy. Microscopic analysis of the RPUF with alumina‐coated CNC confirms that the predominant alignment of CNC occurs in a direction parallel to the foam rise.

中文翻译:

纳米纤维素上金属氧化物的原子层沉积,以实现聚合物纳米复合材料的微观表征

通过常规电子显微镜分析聚合物纳米复合材料中低体积分数的纤维素纳米晶体(CNCs)仍然是一个挑战,因为CNCs与有机聚合物基质之间的对比度不足。本文中,通过氧化铝(Al 2 O 3)的原子层沉积(ALD)来增强CNC对比度的方法)在CNC上进行了演示。当金属氧化物涂层的CNC分散在水和多元醇中时,可以通过透射电子显微镜清晰观察。经过50次ALD循环后,在CNC上获得了约6±1 nm厚的氧化铝层涂层。使用背散射电子显微镜和能量色散X射线光谱技术,这也可以表征无定形蜂窝系统硬质聚氨酯泡沫(RPUF)中的CNC分散/取向(在0.2 wt%载荷下)。用涂有氧化铝的CNC对RPUF进行的显微镜分析证实,CNC的主要对准发生在与泡沫上升平行的方向上。
更新日期:2018-10-16
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