Extraordinary water adsorption characteristics of graphene oxide.
Extraordinary water adsorption characteristics of graphene oxide.
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氧化石墨烯的非凡水吸附特征。
DOI：
10.1039/c8sc00545a
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发表时间：
2018-06-14
期刊：
影响因子：
8.4
通讯作者：
Joshi RK
中科院分区：
文献类型：
--
作者：
Lian B;De Luca S;You Y;Alwarappan S;Yoshimura M;Sahajwalla V;Smith SC;Leslie G;Joshi RK
氧化石墨烯(GO)的层状结构与水分子具有独特的相互作用，可用于要求材料具有可调吸湿性能的一系列应用。氧化石墨烯(GO)的层状结构与水分子具有独特的相互作用，可用于要求材料具有可调吸湿性能的一系列应用。到目前为止，GO层压板中可膨胀层间距和官能团的确切作用还没有完全了解。在这里，我们报道了水在GO层板中的吸附和解吸行为随相对压力的实验和理论研究。我们观察到，GO具有很高的吸水率，每克GO的吸水率高达0.58克(g·g-1)，明显高于作为传统干燥剂的硅胶。更有趣的是，GO的吸附和解吸动力学比硅胶高五倍。观察到的异常吸附/脱附速率可以归因于GO层板中的高毛细压力以及位于表面的微米级隧道状皱纹。
The laminated structure of graphene oxide (GO) confers unique interactions with water molecules which may be utilised in a range of applications that require materials with tuneable hygroscopic properties. The laminated structure of graphene oxide (GO) confers unique interactions with water molecules which may be utilised in a range of applications that require materials with tuneable hygroscopic properties. The precise role of the expandable interlayer spacing and functional groups in GO laminates has not completely been understood to date. Herein, we report the experimental and theoretical investigations on the adsorption and desorption behaviour of water in GO laminates as a function of relative pressure. We observed that GO imparts high water uptake capacity of up to 0.58 gram of water per gram of GO (g g–1), which is significantly higher than silica gel as a conventional desiccant material. More interestingly, the adsorption and desorption kinetics of GO is five times higher than silica gel. The observed extraordinary adsorption/desorption rate can be attributed to the high capillary pressure in GO laminates as well as micro meter sized tunnel-like wrinkles located at the surface.
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