EPR measurements of ACF (host) filled with different liquids (guest) were performed in order to get information about the host reversible guest interaction. Pristine ACF is characterized by single Lorenzian line recorded at g = 2.0031 - value which is characteristic of carbon materials. Only very weak host reversible guest interaction which lead to modified EPR spectrum of pristine ACF was found. Estimation based on the theory of EPR of small particles, gives the ACF nanocrystallites size of 1.34 nm.
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