High -throughput and Multimodal Separation of Microbeads Using Cyclical Induced -charge Electro-osmotic Vortices and Its Application in Size Fractionation of Crumpled Graphene Oxide Balls
High -throughput and Multimodal Separation of Microbeads Using Cyclical Induced -charge Electro-osmotic Vortices and Its Application in Size Fractionation of Crumpled Graphene Oxide Balls
复制标题
利用循环感应电荷电渗涡流对微珠进行高通量和多模式分离及其在皱褶氧化石墨烯球尺寸分级中的应用
DOI：
10.1016/j.apmt.2019.100545
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发表时间：
2020
影响因子：
8.3
通讯作者：
Jiang Hongyuan
中科院分区：
文献类型：
--
作者：
Chen Xiaoming;Ren Yukun;Jiang Tianyi;Hou Likai;Jiang Hongyuan
皱缩氧化石墨烯(CGO)球是一种新型的三维应用材料，具有高比表面积和抗团聚等优点，在储能和转换装置的发展中具有很好的潜力。利用现成的定义尺寸的CGO球来合成所需的材料或对现有的部件进行改性，如果实现了这一点，我们就可以使最终产品的功能和性能更具可控性和可编程性。然而，由于均匀尺寸的原始氧化石墨烯很难获得，而且合成过程中CGO球的尺寸对许多参数敏感，因此获得均匀尺寸的CGO粒子仍然是一个挑战。另一种可能的解决方案是，对合成的CGO球进行分类，以获得统一大小的CGO球，这可能会巧妙地绕过上述棘手的问题。本文设计了倾角脊形浮动电极序列(TARFES)来驱动周期性不对称离子交换膜(AICEO)涡流，实现了颗粒分离，提高了处理能力(105个颗粒/小时)，克服了现有涡流分离准则的局限性。我们首先进行了模拟，以确定TARFES的最佳配置。根据循环AICEO涡的空间特征，发展了两种分离模式。通过对二氧化硅和聚甲基丙烯酸甲酯(PMMA)微球的分离，验证了第一种分离模式的分离能力，并研究了电压和流速对分离效果的影响，获得了97.3%的分离效率。然后对PMMA微球和酵母细胞进行了分离，分离效率为93.1%，证明了第二种分离模式。同时，实现了多个颗粒的同时分离。根据CGO球的特性，成功地设计了第二种分离模式，实现了连续流中CGO球的粒度分级，得到了清晰的分离效果。最后，我们还调制了电压输入，将纳米级的CGO球从背景中分离出来。这种可操作的分离技术为获得尺寸均匀的CGO球提供了一条独特的途径，在电池和超级电容器的制造中具有潜在的应用前景。(C)2019爱思唯尔有限公司。保留所有权利。
Crumpled graphene oxide (CGO) balls are new 3D applied materials, which present good potential in the development of energy storage and conversion devices for the advantages of high surface areas and resis- tant to aggregation. Utilizing ready-made CGO balls with defined sizes to synthesize desired materials or modify existing components, if achieved, we may make the functions and properties of the final prod- ucts more controllable and programmable. However, acquiring uniform-size CGO particles still remains under challenge now, because uniform-size pristine graphene oxide is difficult to obtain and the size of CGO balls is sensitive to many parameters during the synthesis. An alternative potential solution, clas- sifying the synthetized CGO balls to obtain uniform-size CGO balls may ingeniously circumvent above tricky issue. Here we designed tilted-angle ridge floating electrode sequence (TARFES) to actuate cyclical asymmetrical ICEO (AICEO) vortices to achieve particle separation and augment the throughput capa- bility (10 5 particles/h), overcoming the limitation of existing vortex-based separation criteria. We firstly conducted simulations to identify the optimum configuration of TARFES. According to spatial features of cyclic AICEO vortices, two separation modes were developed. We separated silica and polymethyl methacrylate (PMMA) microbeads to validate the capability of the first separation mode, and studied the effects of voltage and flow speed on the separation results, obtaining 97.3% separation efficiency. We then separated PMMA microbeads and yeast cells with 93.1% separation efficiency to evidence the second separation mode. Also, we accomplished the simultaneous separation of multiple particles. Depending on characterization of CGO balls, the second separation mode was successfully engineered to realize size fractionation of CGO balls in continuous flow, yielding clear separation. Finally, we also modulated the voltage input to isolate nanoscale CGO balls from the background. This operative separation technique offers a unique route to acquire uniform-size CGO balls with potential applications in the fabrications of batteries and ultracapacitors. (C) 2019 Elsevier Ltd. All rights reserved.