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

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• 作者：José ; R. Ascenso^a ; ^{jose.ascenso@ist.utl.pt" class="auth_mail" title="E-mail the corresponding author} ; Guilherme Rubio^a ; Joã ; o C.F. Diogo^a ; Helena M.N.T. Avelino^a ; ^b ; Fernando J.P. Caetano^a ; ^c ; Joã ; o M.N.A. Fareleira^a
• 关键词：Self-diffusivity ; Hydrodynamic radius ; Spin-echo ; Dialkyl adipates
• 刊名：Fluid Phase Equilibria
• 出版年：2016
• 出版时间：25 February 2016
• 年：2016
• 卷：410
• 期：Complete
• 页码：37-41
• 全文大小：785 K

文摘

The article reports self-diffusivity measurements of dimethyl (DMA), diethyl (DEA), dipropyl (DPA), dibutyl (DBA), and bis(2-ethylhexyl) (DEHA) adipates from (293–339) K by the PGSE–NMR 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-Einstein-Sutherland-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.