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Transparent, Anisotropic Biofilm with Aligned Bacterial Cellulose Nanofibers

机译：具有对齐的细菌纤维素纳米纤维的透明，各向异性生物膜

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摘要

Cellulose nanofibrils are attractive as building blocks for advanced photonic, optoelectronic, microfluidic, and bio-based devices ranging from transistors and solar cells to fluidic and biocompatible injectable devices. For the first time, an ultrastrong and ultratough cellulose film, which is composed of densely packed bacterial cellulose (BC) nanofibrils with hierarchical fibril alignments, is successfully demonstrated. The molecular level alignment stems from the intrinsic parallel orientation of crystalline cellulose molecules produced by Acetobacter xylinum. These aligned long-chain cellulose molecules form subfibrils with a diameter of 2-4 nm, which are further aligned to form nanofibril bundles. The BC film yields a record-high tensile strength (approximate to 1.0 GPa) and toughness (approximate to 25 MJ m(-3)). Being ultrastrong and ultratough, yet the BC film is also highly flexible and can be folded into desirable shapes. The BC film exhibits a controllable manner of alignment and is highly transparent with modulated optical properties, paving the way to enabling new functionalities in mechanical, electrical, fluidic, photonics, and biocompatible applications.
机译：纤维素纳米原纤维作为先进的光子，光电，微流控和生物基设备的构建基块很有吸引力，这些设备包括晶体管和太阳能电池以及流体和生物相容性可注射设备。首次成功地证明了一种超强而超韧的纤维素膜，该膜由紧密堆积的细菌纤维素（BC）纳米纤维组成，具有分层的原纤维排列。分子水平比对源自木醋杆菌产生的结晶纤维素分子的固有平行取向。这些排列的长链纤维素分子形成直径为2-4 nm的亚原纤维，进一步排列以形成纳米原纤维束。 BC薄膜产生了创纪录的高拉伸强度（约1.0 GPa）和韧性（约25 MJ m（-3））。 BC膜具有超强的韧性，而且还具有很高的柔韧性，可以折叠成所需的形状。 BC膜表现出可控的排列方式，并且高度透明且具有调制的光学特性，为在机械，电气，流体，光子学和生物相容性应用中实现新功能铺平了道路。

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