Aerogel materials with periodic structures imprinted with cellulose nanocrystals†,Nanoscale

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Aerogel materials with periodic structures imprinted with cellulose nanocrystals†
Nanoscale ( IF 5.8 ) Pub Date : 2018-02-07 00:00:00 , DOI: 10.1039/c7nr07719j
Yi-Tao Xu _{1,

2,

3,

4} , Yiling Dai _{1,

2,

3,

4} , Thanh-Dinh Nguyen _{1,

2,

3,

4} , Wadood Y. Hamad _{3,

4,

5} , Mark J. MacLachlan _{1,

2,

3,

4}

Affiliation

Novel aerogel materials with periodic structures derived from chiral nematic liquid crystalline cellulose nanocrystals (CNCs) are reported. The liquid crystalline structure of phase-separated CNCs is locked by a simple solvent exchange method or silica condensation. Both cellulose and silica/cellulose aerogel materials were obtained after critical point drying, and subsequent calcination of the silica/cellulose composite afforded a silica aerogel with periodic order. Gas adsorption and electron microscopy studies revealed that these materials have high surface areas and a unique chiral nematic structure imparted from the helicoidal CNC template. This is a new, scalable approach to aerogel materials with highly anisotropic structures. The high porosity and periodic, chiral features of these new materials may make them suitable for applications that require anisotropic properties or as hard templates for the construction of other ordered aerogels.

中文翻译：

印有纤维素纳米晶体的具有周期性结构的气凝胶材料†

报道了具有周期性结构的新型气凝胶材料，其衍生自手性向列型液晶纤维素纳米晶体（CNC）。相分离的CNC的液晶结构通过简单的溶剂交换方法或二氧化硅冷凝来锁定。在临界点干燥后获得纤维素和二氧化硅/纤维素气凝胶材料，并且随后煅烧二氧化硅/纤维素复合物提供了周期性有序的二氧化硅气凝胶。气体吸附和电子显微镜研究表明，这些材料具有较高的表面积，并由螺旋CNC模板赋予独特的手性向列结构。这是一种具有高度各向异性结构的气凝胶材料的新的，可扩展的方法。高孔隙度和周期性，

更新日期：2018-02-07

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