Laboratory for Multifunctional Materials, Department of Materials, ETH Zürich, Vladimir-Prelog-Weg 5, CH-8093 Zürich (Switzerland).
Angew Chem Int Ed Engl. 2014 Jun 23;53(26):6823-6. doi: 10.1002/anie.201402164. Epub 2014 May 22.
Aerogels with their low density and high surface area are fascinating materials. However, their advantageous morphology is still far from being fully exploited owing to their limited compositional variety and low crystallinity. Replacing the sol-gel process by a particle-based assembly route is a powerful alternative to expand the accessible functionalities of aerogels. A strategy is presented for the controlled destabilization of concentrated dispersions of BaTiO3 nanoparticles, resulting in the assembly of the fully crystalline building blocks into cylindrically shaped monolithic gels, thereby combining the inherent properties of ternary oxides with the highly porous microstructure of aerogels. The obtained aerogels showed an unprecedentedly high surface area of over 300 m(2) g(-1).
气凝胶具有低密度和高表面积，是一种引人入胜的材料。然而，由于其组成种类有限和结晶度低，其有利的形态仍远未得到充分利用。用基于颗粒的组装方法替代溶胶-凝胶过程是扩展气凝胶可及功能的有力替代方法。本文提出了一种控制 BaTiO3 纳米颗粒浓分散体失稳的策略，导致完全结晶的构建块组装成圆柱状整体凝胶，从而将三元氧化物的固有性质与气凝胶的高多孔微观结构结合起来。所得到的气凝胶具有超过 300 m(2) g(-1)的前所未有的高表面积。
