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Development of the Fibrillar and Microfibrillar Structure During Biomimetic Mineralization of Wood

机译：木材仿生矿化过程中原纤维和微原纤维结构的发展

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摘要

Wood is a hierarchical composite, consisting at its lowest hierarchy level of crystalline cellulose elementary fibrils with diameters of 2-4 nm embedded in a matrix of hemicelluloses and lignin. At the micrometer scale, it has a cellular architecture resembling a honeycomb structure. The transformation of the hierarchical wood structure into a silica replica has been reported recently. Its formation process and structural details are studied in this contribution. First, a silica/biopolymer composite is prepared by wood delignification and cell-wall modification, followed by silica precursor infiltration and condensation. The calcination process is monitored to gain insight into the structure development upon decomposition of the biopolymers. The material changes its architecture gradually from fibrillar structures of 10-20 nm in diameter with homogeneous electron density, into fibrils of 8-10 nm in diameter with inhomogeneous electron density, exhibiting internal sub-fibrillar structures of about 2 nm in diameter. The steps of the successful replication of the cellulose elementary fibrils into nanopores of similar diameter and orientation in a fibrillar silica matrix are demonstrated. These nanopore replicas of the original cellulose are wound in a steep helix within the macropore walls. These advanced materials may have lightweight structural applications and the nanopores may be advantageous for molecular separation.
机译：木材是一种层次结构的复合物，在其最低层次的结晶纤维素基本原纤维中，直径为2-4 nm，嵌入半纤维素和木质素的基质中。在微米级，它具有类似于蜂窝结构的蜂窝结构。最近已经报道了将分级木结构转变成二氧化硅仿品的过程。在此贡献中研究了其形成过程和结构细节。首先，通过木材脱木素和细胞壁修饰，然后进行二氧化硅前体渗透和冷凝，制备二氧化硅/生物聚合物复合材料。监测煅烧过程以深入了解生物聚合物分解后的结构发展。该材料逐渐改变其结构，从具有均一电子密度的直径10-20 nm的原纤维结构，变为具有不均一电子密度的直径8-10 nm的原纤维，表现出直径约为2 nm的内部亚原纤维结构。证明了将纤维素基本原纤维成功复制到原纤维二氧化硅基质中相似直径和方向的纳米孔中的步骤。这些原始纤维素的纳米孔复制品缠绕在大孔壁内的陡峭螺旋中。这些先进的材料可以具有轻质的结构应用，并且纳米孔对于分子分离可能是有利的。

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  • 来源
    《Advanced Functional Materials》 |2013年第10期|1265-1272|共8页
  • 作者

    Gerhard Fritz-Popovski; Daniel Van Opdenbosch; Cordt Zollfrank; Barbara Aichmayer; Oskar Paris;

  • 作者单位

    Institute of Physics Montanuniversitaet Leoben Franz-Josef-Str. 18, 8700 Leoben, Austria;

    Biogene Polymere Technische Universitat Munchen Schulgasse 16, 94315 Straubing, Germany;

    Biogene Polymere Technische Universitat Munchen Schulgasse 16, 94315 Straubing, Germany;

    Department of Biomaterials Max Planck Institute of Colloids and Interfaces Wissenschaftspark Potsdam-Colm, 14424 Potsdam, Germany;

    Institute of Physics Montanuniversitaet Leoben Franz-Josef-Str. 18, 8700 Leoben, Austria;

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