Center for Biotechnology and Interdisciplinary Studies , Rensselaer Polytechnic Institute , 1623 15th Street , Troy , New York 12180 , United States.
Department of Physics , Case Western Reserve University , 2076 Adelbert Road , Cleveland , Ohio 44106 , United States.
Biomacromolecules. 2018 Dec 10;19(12):4576-4584. doi: 10.1021/acs.biomac.8b01269. Epub 2018 Nov 5.
A facile and effective method is described for the biosynthesis of ultrathin bacterial cellulose (BC) mats, which are green, inexpensive, lightweight, and flexible. Physical properties studied include thickness, morphology, reflectance, transmittance, and crystallinity index. BC mat thickness was varied by controlling the depth of the culture broth so that films with predictable thickness, between 113 and 1114 nm, were produced. These BC films have similar fiber morphology to corresponding mm thick BC films prepared under static culture conditions. To increase BC film hydrophobicity, surface trihexylsilylated BC (THSBC) mats with DS 0.015 were prepared. Both native and THSBC mats were investigated as antireflection coatings for silicon substrates. The 328 ± 42 nm thick BC mat demonstrated broadband, interference type antireflection over a spectral range of 500-1800 nm. Different reflection properties obtained as a function of BC film orientation reveals that engineered density gradients can be used to manipulate BC optical properties. Thus, optical quality and environmental friendly ultrathin BC films are promising biomaterials for next-generation optoelectronic devices.
描述了一种简便有效的方法，用于生物合成超薄细菌纤维素 (BC) 垫，这些垫是绿色、廉价、轻巧且灵活的。研究的物理性质包括厚度、形态、反射率、透过率和结晶度指数。通过控制培养液的深度来改变 BC 垫的厚度，从而可以生产出具有可预测厚度（在 113nm 到 1114nm 之间）的薄膜。这些 BC 薄膜与在静态培养条件下制备的相应厚度为 mm 的 BC 薄膜具有相似的纤维形态。为了提高 BC 薄膜的疏水性，制备了 DS 为 0.015 的三己基硅烷化 BC (THSBC) 垫。对天然和 THSBC 垫进行了研究，作为硅衬底的抗反射涂层。328±42nm 厚的 BC 垫在 500nm-1800nm 的光谱范围内表现出宽带、干涉型抗反射。作为 BC 膜取向函数获得的不同反射特性表明，可以使用工程密度梯度来操纵 BC 的光学特性。因此，光学质量和环保的超薄 BC 薄膜是下一代光电设备有前途的生物材料。
