Mobility of polar liquids intercalated into the inter-plane space of graphite oxide as re-vealed by EPR spin probe technique

Аствацатуров, Д.А.; Чумакова, Н.А.

Авторы: Аствацатуров Д.А., Чумакова Н.А.
Сборник: ABSTRACTS OF THE INTERNATIONAL CONFERENCES “MODERN DEVELOPMENT OF MAGNETIC RESONANCE” AND “SPIN PHYSICS, SPIN CHEMISTRY, AND SPIN TECHNOLOGY”
Тезисы
Год издания: 2022
Место издания: Zavoisky Physical-Technical Institute, FRC Kazan Scientific Center of RAS Казань Казань
Первая страница: 81
Последняя страница: 81
Аннотация: Graphite oxide (GO) – a layered non-stoichiometric derivative of graphite – easily swellsin polar liquids. Swelling leads to the intercalation of liquids into the inter-plane spaceof the material. GO/water suspensions are used to obtain graphene oxide membranes(GOMs) – thin layered films, which are perspective materials for filtering and separationof polar liquids mixtures. It is known that GOMs possess unique separation selectivity: the permeability for water is much higher than for ethanol, methanol and otherpolar liquids. The key to this phenomenon seems to be an understanding of propertiesof liquids inside GO. The goal of this contribution is to study the mobility of polarliquids of different nature (acetonitrile, methanol, ethanol, and water) inside GO, andto reveal the correlation between the intercalated liquids mobility and their ability topermeate through GO membranes. The mobility of intercalated liquids was estimatedon 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 withdifferent mobility – solid-like and liquid-like. The relative amount of these fractionsdepends on temperature and amount of intercalated substance. The liquid-like fractionpossesses much lower mobility if to compare with the corresponding bulk liquid. Therotational mobility of methanol and ethanol was found to be is nearly the same but itis higher than for acetonitrile. This is intriguing due to the fact that viscosity of thebulk methanol and ethanol is higher than viscosity of acetonitrile. The mobility ofintercalated water was found to be close to the mobility of intercalated ethanol andmethanol in wide temperature range.
Добавил в систему: Аствацатуров Дмитрий Александрович

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Mobility of polar liquids intercalated into the inter-plane space of graphite oxide as re-vealed by EPR spin probe techniqueтезисы доклада

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