Ultraviolet-magnetic response multicolored janus colloidal photonic crystal beads for information coding
Ultraviolet-magnetic response multicolored janus colloidal photonic crystal beads for information coding
复制标题
用于信息编码的紫外磁响应多色Janus胶体光子晶体珠
DOI：
10.1016/j.colsurfa.2022.129918
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
魏杰
中科院分区：
文献类型：
--
作者：
李南姝;陈子浩;王雨霏;陈宜萍;杨双烨;胡佳硕;魏杰
报道了一种新型的紫外-磁响应Janus胶体光子晶体微球。由荧光CPC和Fe 3 O 4纳米粒子组成的Janus珠在可见光、紫外光和磁场刺激下呈现不同的颜色。在具体方案中，采用半连续乳液聚合法制备了含荧光分子SPMA和不含荧光分子SPMA的单分散胶体粒子。以胶体粒子和Fe 3 O 4纳米粒子为前驱体，采用液滴模板法制备Janus微球。在缓慢自组装过程中，Fe 3 O 4纳米粒子沉积在微球底部，胶体粒子填充微球的其他部分，形成Janus结构.因此，Janus珠的上表面呈现结构色，下表面呈现黑色。不同半球中Fe含量的变化允许可控的磁响应来反转珠。荧光分子SPMA的存在使得荧光Janus珠（FJB）在紫外光下发射荧光。根据设计，Janus珠特定排列的阵列可以实现三种不同光学信息之间的可逆变化。此外，将二进制密码与Janus珠相结合，设计并制作了光学编码阵列，揭示了其在信息编码中的重要应用。
We report a new kind of ultraviolet (UV)-magnetic response Janus colloidal photonic crystal (CPC) beads for information coding. The Janus beads made up of fluorescent CPCs and Fe3O4nanoparticles show different colors under visible light, UV light and magnetic stimulation. In the concrete scheme, monodisperse colloidal particles with and without fluorescent molecule SPMA were prepared by semi-continuous emulsion polymerization. Then colloidal particles and Fe3O4nanoparticles were paired as precursors to prepare Janus beads by the droplet template method. During the slow self-assembly process, Fe3O4nanoparticles were deposited on the bottom and colloidal particles filled the other parts of the beads so that a Janus structure formed. Therefore, the upper surface of Janus beads appears structural color and the lower surface appears black. The variation of Fe content in different hemispheres allows the controllable magnetic response to reverse the beads. The presence of fluorescent molecule SPMA makes fluorescent Janus beads (FJBs) emit fluorescence under UV light. According to design, an array in a particular arrangement of Janus beads can realize reversible changes between three different optical information. Furthermore, the binary cipher was combined with Janus beads to design and fabricate an optical encoding array, revealing an important application in information coding.