Authors: Ki Myoung Song YoungSam Cho
Publish Date: 2015/12/12
Volume: 29, Issue: 12, Pages: 5335-5343
Abstract
In this study a parametric study was performed for the spraying technique used to fabricate polystyrene PS superhydrophobic surfaces The spraying distance the spraying time and the polymer concentration were selected as the parameters to be varied Tetrahydrofuran THF was used for the solvent First a dissolved PS solution in THF was prepared Then the dissolved PS solution was sprayed onto the coverglass The Nozzle size working pressure glove box temperature and humidity were fixed at 02 mm 02 MPa 2315±083°C and 5413±146 respectively After that the surface morphology of the sprayed surface and water contact angle WCA were assessed by Scanning electron microscopy SEM and a contact angle meter According to the spraying distance increased the WCA was decreased in all three cases of the 15 vol PS solution However the WCA was approximately 158° regardless of the spraying time or distance in all three cases of 60 vol PS solution The amount of PS deposited per unit area was shown to be the key parameter in determining the hydrophobicity as expected However the PS concentration and the spraying distance affected the hydrophobicity regardless of the amount of PS deposited Additionally using leastsquares method of the Origin 81 program fitting procedures for the WCA results a watercontactangle map of the PSsprayed specimen was generated within the experimental parametersYoungSam Cho received his BS MS and PhD degrees in Mechanical Engineering from KAIST in 1997 1999 and 2004 respectively He is currently an associate professor at Wonkwang University Korea His research interests include computational mechanics tissue engineering and surface modification
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