Marangoni Flow Manipulated Concentric Assembly of Cellulose Nanocrystals,Small Methods

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Marangoni Flow Manipulated Concentric Assembly of Cellulose Nanocrystals
Small Methods ( IF 10.7 ) Pub Date : 2021-09-14 , DOI: 10.1002/smtd.202100690
Rongrong Shao ₁ , Xiao Meng ₁ , Zhaojie Shi ₁ , Jiajia Zhong ₂ , Zheren Cai ₃ , Junhao Hu ₄ , Xiao Wang ₁ , Gang Chen ₁ , Shenghua Gao ₄ , Yanlin Song ₃ , Chunhong Ye ₁

Affiliation

Tunable assembly of cellulose nanocrystals (CNCs) is important for a variety of emerging applications in optics, sensing, and security. Most exploited assembly and optical property of CNCs are cholesteric assembly and corresponding circular dichroism. However, it still remains challenge to obtain homogenous and high-resolution cholesteric assembly. Distinct assembly and optical property of CNCs are highly demanded for advanced photonic materials with novel functions. Herein, a facile and programmable approach for assembling CNCs into a novel concentric alignment using capillary flow and Marangoni effect, which is in strike contrast to conventional cholesteric assembly, is demonstrated. The concentric assembly, as quantitatively evidenced by polarized synchrotron radiation Fourier transform infrared imaging, demonstrates Maltese cross optical pattern with good uniformity and high resolution. Furthermore, this Maltese cross can be readily regulated to “on/off” states by temperature. By combining with 3D inkjet technology, a functional binary system composed of “on”/“off” CNCs optical patterns with high spatial resolution, fast printing speed, good repeatability, and precisely controllable optical property is established for information encryption and decryption. This concentric assembly of CNCs and corresponding tunable optical property emerge as a promising candidate for information security, anticounterfeiting technology, and advanced optics.

中文翻译：

Marangoni 流动操纵纤维素纳米晶体的同心组装

纤维素纳米晶体 (CNC) 的可调谐组装对于光学、传感和安全领域的各种新兴应用非常重要。CNCs 最被开发的组装和光学特性是胆甾型组装和相应的圆二色性。然而，获得同质和高分辨率的胆甾醇组装仍然是一个挑战。具有新颖功能的先进光子材料对 CNC 的独特组装和光学性能提出了很高的要求。在这里，展示了一种使用毛细管流动和马兰戈尼效应将 CNC 组装成新型同心对准的简便且可编程的方法，这与传统的胆甾型组装形成鲜明对比。同心组件，由偏振同步辐射傅里叶变换红外成像定量证明，展示了具有良好均匀性和高分辨率的马耳他十字光学图案。此外，这个马耳他十字可以很容易地通过温度调节到“开/关”状态。结合3D喷墨技术，建立了空间分辨率高、打印速度快、重复性好、光学特性精确可控的“开”/“关”CNC光学图案组成的功能二进制系统，用于信息加解密。这种 CNC 的同心组件和相应的可调谐光学特性成为信息安全、防伪技术和先进光学的有希望的候选者。建立了空间分辨率高、打印速度快、重复性好、光学特性精确可控的“开”/“关”CNC光学图案组成的功能二进制系统，用于信息加解密。这种 CNC 的同心组件和相应的可调谐光学特性成为信息安全、防伪技术和先进光学的有希望的候选者。建立了空间分辨率高、打印速度快、重复性好、光学特性精确可控的“开”/“关”CNC光学图案组成的功能二进制系统，用于信息加解密。这种 CNC 的同心组件和相应的可调谐光学特性成为信息安全、防伪技术和先进光学的有希望的候选者。

更新日期：2021-11-12

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