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|Title: ||Fluorinated surfactants in solution: Diffusion coefficients of fluorinated alcohols in water|
|Authors: ||Martins, Luís F. G.|
Pereira, Luís A. M.
Silva, Gonçalo M. C.
Ascenso, José R.
Prates Ramalho, João P.
Filipe, Eduardo J. M.
|Keywords: ||Fluorinated alcohols|
PFG-NMR spin echo
|Issue Date: ||2016|
|Citation: ||Luís F.G. Martins, Luís A.M. Pereira, Gonçalo M.C. Silva, José R. Ascenso, Pedro Morgado, João P. Prates Ramalho, Eduardo J.M. Filipe, Fluid Phase Equilibria 407 (2016) 322–333|
|Abstract: ||Intra-diffusion coefficients of three
fluorinated alcohols, 2,2,3,3,3-pentafluoropropan-1-ol (PFP),
2,2,3,3,4,4,4-heptafluorobutan-1-ol (HFB) and 2,2,3,3,4,4,5,5,5-nonafluoropentan-1-ol (NFP) in water
have been measured by the PFG–NMR spin-echo technique as a function of temperature and
composition, focusing on the alcohol dilute region. For comparison, intra-diffusion coefficients of 2,2,2-
trifluoroethanol (TFE) and HFB have also been measured in heavy water using the same method and
conditions. As far as we know, these are the
first experimental measurements of this property for these
binary systems. Intra-diffusion coefficients for NFP in water and for TFE and HFB in heavy water have also
been obtained by molecular dynamics simulation, complementing those for TFE, PFP and HFB reported in
a previous work. The agreement between experimental and simulated results for PFP, HFB and NFP in
water is reasonable, although presenting higher deviations than for the TFE/water system. From the
dependence of the intra-diffusion coefficients on temperature, diffusion activation energies were
estimated for all the solutes in water and heavy water.|
|Appears in Collections:||CQE - Publicações - Artigos em Revistas Internacionais Com Arbitragem Científica|
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