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Graphite oxide (GO) - a layered non-stoichiometric derivative of graphite - easily swells in polar liquids. Swelling leads to the intercalation of liquids into the inter-plane space of the material. GO/water suspensions are used to obtain graphene oxide membranes (GOMs) – thin layered films, which are perspective materials for filtering and separation of polar liquids mixtures. It is known that GOMs possess unique separation selectivity: the permeability for water is much higher than for ethanol, methanol and other polar liquids. The key to this phenomenon seems to be an understanding of properties of liquids inside GO. The goal of this contribution is to study the mobility of polar liquids of different nature (ace-tonitrile, methanol, ethanol, and water) inside GO, and to reveal the correlation between the intercalated liquids mobility and their ability to permeate through GO membranes. The mo-bility of intercalated liquids was estimated on the basis of the mobility of TEMPO radicals inserted in between the GO planes. We found out that all liquids under study form inside GO two fractions with different mobility – solid-like and liquid-like. The relative amount of these fractions depends on tem-perature and amount of intercalated substance. The liquid-like fraction possesses much low-er mobility if to compare with the corresponding bulk liquid. The rotational mobility of methanol and ethanol was found to be is nearly the same but it is higher than for acetonitrile. This is intriguing due to the fact that viscosity of the bulk methanol and ethanol is higher than viscosity of acetonitrile. The mobility of intercalated water was found to be close to the mobility of intercalated ethanol and methanol in wide temperature range.
№ | Имя | Описание | Имя файла | Размер | Добавлен |
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1. | Тезисы | MDMR-23_f.pdf | 111,0 КБ | 12 ноября 2023 [Astvatsaturov] |