Ageing under extreme ph conditions, modification and characterization of ultrafiltration and nanofiltration membranes
Abstract
Tesis con mención internacional.Tesis doctoral por el sistema de compendio de publicaciones
Full text
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R. Be ns ein, E. An ón, M. Ulb ich , UV-pho o g a unc ionaliza ion o polye he sul one
memb ane wi h s ong polyelec oly e hyd ogel and i s applica ion o nano il a ion, ACS
Applied Ma e ials and In e aces 4 (2012) 3438-3446. Impac ac o : 5.008
R. Be ns ein, E. An ón, M. Ulb ich , Tuning he nano il a ion pe o mance o hin ilm
s ong polyelec oly e hyd ogel composi e memb anes by pho o-g a ing condi ions,
Jou nal o Memb ane Science 427 (2013) 129-138. Impac ac o : 4.093
E. An ón, J.I. Ignacio, J.R. Ál a ez, A. He nández, S. Luque, Fi ing app oach o liquid-
liquid displacemen po osime y based on he log-no mal po e size dis ibu ion, Jou nal o
Memb ane Science. h p://dx.doi.o g/10.1016/j.memsci.2014.07.035. Accep ed (2014).
Impac ac o : 4.093
Además, en el momen o de deposi a la misma se encuen an en e isión los siguien es
a ículos, cuyo con enido se ha incluido en la esis en o ma de capí ulos:
E. An ón, D. Vázquez, J.R. Ál a ez, S. Luque, Ageing o nano il a ion polyme ic
memb anes unde he exposu e o acidic and alkaline cleaning solu ions, Sepa a ion and
Pu i ica ion Technology. Submi ed (2014).
E. An ón, J.R. Ál a ez, L. Palacio, P. P ádanos, A. He nández, A. Pihlajamäki, S. Luque,
Ageing o polye he sul one ul a il a ion memb anes unde long- e m exposu es o
alkaline and acidic cleaning solu ions. Pa I: physicochemical changes, Jou nal o
Memb ane Science. Submi ed (2014).
E. An ón, J.R. Ál a ez, S. Luque, Ageing o polye he sul one ul a il a ion memb anes
unde long- e m exposu es o alkaline and acidic cleaning solu ions. Pa II: memb ane
pe o mance, Jou nal o Memb ane Science. Submi ed (2014).
En O iedo a 29 de julio de 2014
Di ec o /es de la Tesis Doc o al
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5.1.3.1. Memb ane pe o mance h oughou he alkaline ageing ................... 79
5.1.3.2. Memb ane pe o mance h oughou he acidic ageing ....................... 81
5.1.3.3. E ec s o he ageing condi ions on memb ane MWCOs ..................... 82
5.1.3.4. E ec s o he ageing condi ions on memb ane su ace composi ion .. 85
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5.1.3.5. E ec s o he ageing condi ions on memb ane s uc u e ................... 86
5.1.3.6. E ec s o he ageing condi ions on memb ane opog aphy ............... 88
5.1.3.7. E ec s o he ageing condi ions on memb ane hyd ophobici y .......... 90
5.1.3.8. Discussion........................................................................................... 90
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5.1.4.1. Memb ane pe o mance h oughou he alkaline ageing ................... 92
5.1.4.2. Memb ane pe o mance h oughou he acidic ageing ...................... 92
5.1.4.3. E ec s o he ageing condi ions on memb ane MWCOs .................... 94
5.1.4.4. E ec s o he ageing condi ions on memb ane
su ace composi ion ............................................................................ 95
5.1.4.5. E ec s o he ageing condi ions on memb ane s uc u e ................... 97
5.1.4.6. E ec s o he ageing condi ions on memb ane opog aphy ............... 98
5.1.4.7. E ec s o he ageing condi ions on memb ane hyd ophobici y ........ 100
5.1.4.8. Discussion......................................................................................... 103
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