Aerogel templating on functionalized fibers of nanocellulose networks†,Materials Chemistry Frontiers

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Aerogel templating on functionalized fibers of nanocellulose networks†
Materials Chemistry Frontiers ( IF 6.0 ) Pub Date : 2018-07-10 00:00:00 , DOI: 10.1039/c8qm00200b
Thanh-Dinh Nguyen _{1,

2,

3,

4} , Wadood Y. Hamad _{3,

4,

5} , Mark J. MacLachlan _{1,

2,

3,

4}

Affiliation

We present novel spaghetti-like gel fibers of gelatin-functionalized cellulose nanocrystals (gCNCs) and aerogel templating of semiconductors on the gCNC scaffolds. An injection method is first used to make CNC aerogel fibers by crosslinking with gelatin (GE). The gelation of the injectable fibers can be conducted by manipulating interactions between CNCs and GE to preserve the chiral nematic order. The gCNC fibers are then used as templates to make porous TiO₂/gCNC aerogel composites with structural organization imparted by the chiral arrangement and hierarchical organization of the gCNC fibers. The uniqueness of this templating concept lies in its ability to truly replicate spindle-shaped features of CNCs in freestanding TiO₂ nanofibrillar aerogels. The affinity of functional groups of gelatin on the CNC aerogels with metal-based precursors causes the attachment of TiO₂ nanoparticles around cellulose nanorods to form core–shell-like aerogel composites. The uniform integration of these components leads to the retention of TiO₂ aerogel fibers after thermal removal of the gCNC template. To further demonstrate the use of gCNC fibers for templating, they are used to fabricate polypyrrole composites that retain the chiral structure of the aerogel. These new templated fibers are promising materials for supercapacitor electrodes, sensors, catalysts, and dye-sensitized solar cells. The results described here demonstrate a new and generalizable method to construct mesoporous materials with an open-network structure through helicoidal aerogel templating at the nanoscale.

中文翻译：

气凝胶在纳米纤维素网络的功能化纤维上进行模板制作†

我们介绍明胶功能化的纤维素纳米晶体（gCNCs）的新型意大利面条状凝胶纤维和gCNC支架上半导体的气凝胶模板。首先使用注射方法通过与明胶（GE）交联来制造CNC气凝胶纤维。可注射纤维的凝胶化可通过操纵CNC与GE之间的相互作用来保持手性向列顺序。然后将gCNC纤维用作模板，以制备具有由gCNC纤维的手性排列和分层组织赋予的结构组织的多孔TiO ₂ / gCNC气凝胶复合材料。该模板概念的独特之处在于其能够在独立的TiO _2中真正复制CNC主轴形状的功能。纳米原纤维气凝胶。CNC气凝胶上的明胶官能团与金属基前体的亲和力导致TiO ₂纳米颗粒围绕纤维素纳米棒附着，形成核-壳状气凝胶复合材料。这些组分的均匀结合导致TiO ₂的保留热除去gCNC模板后的气凝胶纤维。为了进一步证明gCNC纤维在模板中的用途，将它们用于制造保留气凝胶手性结构的聚吡咯复合材料。这些新型模板化纤维是用于超级电容器电极，传感器，催化剂和染料敏化太阳能电池的有前途的材料。此处描述的结果证明了一种新的，可推广的方法，可通过在纳米尺度上通过螺旋气凝胶模板来构建具有开放网络结构的介孔材料。

更新日期：2018-07-10

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