De Schoenmaker, Bert, Van de Schueren, Lien, Zugle, Ruphino, Goethals, Annelies, Westbroek, Philippe, Kiekens, Paul, Nyokong, Tebello, De Clerck, Karen. SpringerLink; 2013. Effect of the relative humidity on the fibre morphology of polyamide 4.6 and polyamide 6.9 nanofibres.