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Ultrasensitive Magnetic Tuning of Optical Properties of Films of Cholesteric Cellulose Nanocrystals.
ACS Nano ( IF 15.8 ) Pub Date : 2020-06-23 , DOI: 10.1021/acsnano.0c00506 Tianxing Chen 1 , Qinglan Zhao 2 , Xin Meng 1 , Yao Li 1 , Hui Peng 3 , Andrew K Whittaker 3 , Shenmin Zhu 1
ACS Nano ( IF 15.8 ) Pub Date : 2020-06-23 , DOI: 10.1021/acsnano.0c00506 Tianxing Chen 1 , Qinglan Zhao 2 , Xin Meng 1 , Yao Li 1 , Hui Peng 3 , Andrew K Whittaker 3 , Shenmin Zhu 1
Affiliation
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Chiral photonic crystals derived from the self-assembly of cellulose nanocrystals (CNCs) have found important applications in optical devices due to the capacity to adjust the chiral nematic phase under external stimulus, in particular an applied magnetic field. To date, strong magnetic fields have been required to induce an optical response in CNC films. In this work, the self-assembly of films of CNCs can be tuned by applying an ultrasmall magnetic field. The CNCs, decorated with Fe3O4 nanoparticles (Fe3O4/CNCs), were dispersed in suspensions of neat CNCs so as to alter the magnetic response of the CNCs. A subsequent process of dispersion not only prevents the clumping of the magnetic nanoparticles but also enhances the sensitivity to an applied magnetic field. A small magnetic field of 7 mT can tune the self-assembly and the microstructure of the CNCs. The pitch of the chiral structure decreased with an increase in applied magnetic field, from 302 to 206 nm, for fields from 7 to 15 mT. This phenomenon is opposite that observed for neat CNCs, in which the pitch is observed to increase with an increase in the external magnetic strength. The optical response under application of an ultrasmall magnetic field could help with theoretical research and enable more applications, such as sensors or nanotemplating agents.
中文翻译：
胆甾型纤维素纳米晶体薄膜光学特性的超灵敏磁调谐。
由纤维素纳米晶体（CNC）的自组装衍生的手性光子晶体由于在外部刺激（特别是施加的磁场）下能够调节手性向列相的能力而在光学装置中发现了重要的应用。迄今为止，需要强磁场在CNC薄膜中引起光学响应。在这项工作中，可以通过施加超小磁场来调整CNC薄膜的自组装。用Fe 3 O 4纳米颗粒（Fe 3 O 4/ CNCs）分散在纯净的CNC悬浮液中，以改变CNC的磁响应。后续的分散过程不仅可以防止磁性纳米粒子结块，还可以提高对施加磁场的敏感性。7 mT的小磁场可以调整CNC控制器的自组装和微观结构。对于7至15 mT的磁场，手性结构的间距随着施加的磁场的增加而减小，从302 nm增大到206 nm。这种现象与纯净CNC的情况相反，在这种情况下，随着外部磁场强度的增加，间距会增加。在超小磁场作用下的光学响应可能有助于理论研究，并能实现更多应用，例如传感器或纳米模板剂。
更新日期：2020-08-25
中文翻译：
胆甾型纤维素纳米晶体薄膜光学特性的超灵敏磁调谐。
由纤维素纳米晶体（CNC）的自组装衍生的手性光子晶体由于在外部刺激（特别是施加的磁场）下能够调节手性向列相的能力而在光学装置中发现了重要的应用。迄今为止，需要强磁场在CNC薄膜中引起光学响应。在这项工作中，可以通过施加超小磁场来调整CNC薄膜的自组装。用Fe 3 O 4纳米颗粒（Fe 3 O 4/ CNCs）分散在纯净的CNC悬浮液中，以改变CNC的磁响应。后续的分散过程不仅可以防止磁性纳米粒子结块，还可以提高对施加磁场的敏感性。7 mT的小磁场可以调整CNC控制器的自组装和微观结构。对于7至15 mT的磁场，手性结构的间距随着施加的磁场的增加而减小，从302 nm增大到206 nm。这种现象与纯净CNC的情况相反，在这种情况下，随着外部磁场强度的增加，间距会增加。在超小磁场作用下的光学响应可能有助于理论研究，并能实现更多应用，例如传感器或纳米模板剂。
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