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Pore characteristics and mechanical properties of silica templated by wood

机译:木材模板化二氧化硅的孔隙特征和力学性能

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The pore characteristics and the mechanical properties of silica samples templated by wood were investigated. The wood samples had been either solely extracted with solvent, delignified or delignified and functionalized with maleic acid anhydride prior to infiltration with tetraethyl orthosilicate and subsequent calcination. All three samples show similar mesopore characteristics, while the one based on maleic acid anhydride functionalized wood exhibited also a large volume of micropores. These micropores are only partly accessible as shown by a combination of in situ small angle x-ray scattering and sorption experiments with n-pentane. Nanoindentation experiments reveal that the presence of the micropores decreases the indentation hardness of the material, while the reduced elastic modulus is similar for all three samples when taking mesoporosity properly into account. In addition, the micropores enhance the ductility index of the material. The microporosity introduced by this biotemplating approach proves to be advantageous for increasing the toughness of silica, as the material can dissipate more energy by irreversible collapse of the pores.
机译:研究了以木材为模板的二氧化硅样品的孔隙特性和力学性能。在用原硅酸四乙酯渗透并随后煅烧之前,仅用溶剂萃取木材样品,将其脱木素或脱木素并用马来酸酐官能化。所有三个样品均显示出相似的中孔特征,而基于马来酸酐官能化木材的样品也显示出大量的微孔。如原位小角度X射线散射和正戊烷吸附实验的结合所显示的,这些微孔只能部分进入。纳米压痕实验表明,微孔的存在降低了材料的压痕硬度,而当适当考虑介孔性时,所有三个样品的降低的弹性模量相似。另外,微孔增强了材料的延展性指数。通过这种生物模板方法引入的微孔被证明对于提高二氧化硅的韧性是有利的,因为该材料可以通过孔的不可逆塌陷而耗散更多的能量。

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