Self-diffusivity measurements of dimethyl, diethyl, dipropyl, dibutyl, Bis(2-ethylhexyl) adipates from (293-339) K by a PGSE-NMR spin-echo technique

The article reports self-diffusivity measurements of dimethyl (DMA), diethyl (DEA), dipropyl (DPA), dibutyl (DBA), and bis(2-ethylhexyl) (DEHA) adipates from (293e339) K by the PGSEeNMR technique. The expanded uncertainty of the results is estimated to better than ±2%. The results are interpreted in...

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Detalhes bibliográficos
Autor principal: Ascenso, José R. (author)
Outros Autores: Rubio, Guilherme (author), Diogo, João C.F. (author), Avelino, Helena Maria Da Nóbrega Teixeira (author), Caetano, Fernando (author), Fareleira, João (author)
Formato: article
Idioma:eng
Publicado em: 2017
Assuntos:
Self-diffusivity
Hydrodynamic radius
Spin-echo
Dialkyl adipates
Texto completo:http://hdl.handle.net/10400.21/7182
País:Portugal
Oai:oai:repositorio.ipl.pt:10400.21/7182
Descrição
Resumo:The article reports self-diffusivity measurements of dimethyl (DMA), diethyl (DEA), dipropyl (DPA), dibutyl (DBA), and bis(2-ethylhexyl) (DEHA) adipates from (293e339) K by the PGSEeNMR technique. The expanded uncertainty of the results is estimated to better than ±2%. The results are interpreted in terms of the hydrodynamic and the van der Waals radii. The former are calculated a Stokes-EinsteinSutherland-type equation, using recently published viscosity data. Furthermore, recently published density data for those adipates are used to calculate the hard sphere radii at contact in a cubic lattice, in order to compare the radii obtained from transport properties with those obtained from equilibrium data. In this temperature range the self-diffusivities of the liquid dialkyl adipates studied have an Arrhenius-like behavior.

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