Characterization of polyethersulfone hemodialysis membrane by ultrafiltration and atomic force microscopy. Barzin, Jalal; Feng, C.; Khulbe, K.C.; Matsuura, T.; Madaeni, S.S.; Mirzadeh, H. Journal of Membrane Science vol. 237 issue 1-2 July 1, 2004. p. 77-85
then your question is erroneously giving paper title.