Facile optimization of hierarchical topography and chemistry on magnetically active graphene oxide nanosheets,Chemical Science

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Facile optimization of hierarchical topography and chemistry on magnetically active graphene oxide nanosheets
Chemical Science ( IF 7.6 ) Pub Date : 2020-03-20 , DOI: 10.1039/d0sc00517g
Avijit Das ₁ , Kousik Maji ₁ , Sarajit Naskar ₁ , Uttam Manna _{1,

2}

Affiliation

Highly flexible and two-dimensional (2D) graphene oxide (GO) nanosheets have remained instrumental for developing different functional materials for practically relevant applications. In general, 2D GO is routinely assembled into different structures (i.e. layered, porous, etc.) for achieving desired properties. However, a facile approach for modifying GO nanosheets with (1) hierarchical topography and (2) desired chemistry is rare in the literature. In this report, adequate optimization of both hierarchical topography and low surface energy chemistry in a confined space (in the order of μm dimensions) of GO nanosheets is unprecedentedly carried out for achieving magnetically active and 2D ‘confined-super-water-repellence’. A chemically reactive polymeric complex was covalently deposited on the GO-nanosheets through a facile 1,4-conjugate addition reaction for adopting a chemically reactive and hierarchically featured polymeric interface. Simultaneously, the deposition of iron oxide nanoparticles on the 2D-nanosheets rendered the entire material magnetically active. The post-covalent modification of these chemically/magnetically active and hierarchically featured GO-nanosheets with octadecylamine (ODA) yielded magnetically active and 2D ‘confined-superhydrophobicity’. Further, this synthesized material was extended for addressing highly relevant and severe global challenges of ‘oil-in-water’ and ‘water-in-oil’ emulsion separation by either selective collection (with an efficiency of above 1000 wt%) of tiny oil-droplets from bulk water or forming magnetically active ‘Pickering-type’ aqueous droplets, respectively, under various practically relevant harsh conditions, including extremes of pH, salinity, surfactant contamination, etc. Further, appropriate functionalization of this chemically/magnetically active 2D nano-interface could be useful in developing functional interfaces for various applications related to energy, catalysis and healthcare.

中文翻译：

磁性活性氧化石墨烯纳米片的分层形貌和化学的轻松优化

高度柔性的二维 (2D) 氧化石墨烯 (GO) 纳米片对于开发实际相关应用的不同功能材料仍然发挥着重要作用。一般来说，2D GO 通常被组装成不同的结构（即层状、多孔等）以获得所需的性能。然而，文献中很少有一种利用（1）分层形貌和（2）所需化学性质来修饰 GO 纳米片的简便方法。在这份报告中，史无前例地对 GO 纳米片的有限空间（微米级）的分层形貌和低表面能化学进行了充分优化，以实现磁性活性和二维“有限超疏水性”。通过简单的 1,4-共轭加成反应，将化学反应性聚合物复合物共价沉积在 GO 纳米片上，以采用化学反应性和分层特征的聚合物界面。同时，氧化铁纳米颗粒在二维纳米片上的沉积使整个材料具有磁性活性。用十八胺 (ODA) 对这些具有化学/磁性活性和分级特征的 GO 纳米片进行后共价修饰，产生磁性活性和 2D“受限超疏水性”。此外，这种合成材料还被扩展用于通过选择性收集（效率超过 1000 wt%）微小油来解决“水包油”和“油包水”乳液分离的高度相关且严峻的全球挑战-在各种实际相关的恶劣条件下，包括极端的pH值、盐度、表面活性剂污染等，分别从散装水中形成水滴或形成磁活性“皮克林型”水滴。此外，这种化学/磁活性2D纳米材料的适当功能化-interface 可用于开发与能源、催化和医疗保健相关的各种应用的功能接口。

更新日期：2020-03-20

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