Li Zong-Lin, Chen Kun, Li Fei, Shi Zhi-Jun, Sun Qi-Li, Li Peng-Qi, Peng Yu-Gui, Huang Lai-Xin, Yang Guang, Zheng Hairong, Zhu Xue-Feng
School of Physics and Innovation Institute, Huazhong University of Science and Technology, 430074, Wuhan, China.
Shenzhen Institute of Advanced Technology, and Biomedical Imaging Science and System Key Laboratory, Chinese Academy of Sciences, 518055, Shenzhen, China.
Nat Commun. 2023 Sep 1;14(1):5319. doi: 10.1038/s41467-023-41172-2.
Cellulose, as a component of green plants, becomes attractive for fabricating biocompatible flexible functional devices but is plagued by hydrophilic properties, which make it easily break down in water by poor mechanical stability. Here we report a class of SiO-nanoparticle-decorated bacteria-cellulose meta-skin with superior stability in water, excellent machining property, ultrathin thickness, and active bacteria-repairing capacity. We further develop functional ultrasonic metasurfaces based on meta-skin paper-cutting that can generate intricate patterns of 10 μm precision. Benefited from the perfect ultrasound insulation of surface Cassie-Baxter states, we utilize meta-skin paper-cutting to design and fabricate ultrathin (20 μm) and super-light (<20 mg) chip-scale devices, such as nonlocal holographic meta-lens and the 3D imaging meta-lens, realizing complicated acoustic holograms and high-resolution 3D ultrasound imaging in far fields. The decorated bacteria-cellulose ultrasonic metasurface opens the way for exploiting flexible and biologically degradable metamaterial devices with functionality customization and key applications in advanced biomedical engineering technologies.
纤维素作为绿色植物的一种成分，在制造生物相容性柔性功能器件方面具有吸引力，但却受到亲水性的困扰，这使其因机械稳定性差而容易在水中分解。在此，我们报道了一类二氧化硅纳米颗粒修饰的细菌纤维素超材料表皮，它在水中具有卓越的稳定性、出色的加工性能、超薄的厚度以及活跃的细菌修复能力。我们进一步基于超材料表皮的剪纸工艺开发了功能性超声超表面，其能够产生精度约为10μm的复杂图案。得益于表面卡西 - 巴克斯特状态的完美超声绝缘，我们利用超材料表皮剪纸工艺设计并制造了超薄（约20μm）且超轻（<20mg）的芯片级器件，如非局部全息超透镜和3D成像超透镜，实现了复杂的声全息图以及远场中的高分辨率3D超声成像。这种修饰的细菌纤维素超声超表面为开发具有功能定制性的柔性且可生物降解的超材料器件开辟了道路，并在先进生物医学工程技术中具有关键应用。
