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Showing 2 results for Superhydrophobic Surface
Evaluation of the Effect of Polyethylene Glycol Addition on the Wetting Properties of ZnO Superhydrophobic Surfaces Prepared via Chemical Bath Deposition Method
E. Velayi, R. Norouzbeigi,
Volume 36, Issue 4 (3-2018)
Abstract
A superhydrophobic ZnO surface was prepared on the stainless steel mesh by a one-step chemical bath deposition method without chemical post-treatment. The effect of adding polyethylene glycol 6000 (PEG 6000) as an organic additive and the type of the alkaline agent were investigated on the morphological and wettability properties of ZnO surfaces. The prepared surfaces were characterized by X-ray Diffraction (XRD), stylus profilometer, Scanning Electron Microscope (SEM), Fourier Transform Infrared (FTIR) and Raman Spectrometer. The microstructure studies showed that the addition of PEG led to formation of densely branched and uniform ZnO rods with a length of 1.5 µm and a diameter of about 95 nm on the substrate. The surface wettability studies confirmed that the sample prepared in the presence of hexamethylenetetramine (HMTA) and 0.05 mM PEG with branched tree-like micro/nanostructure exhibited excellent superhydrophobic properties with the water contact angle (WCA) of 158.2°±1.5° and contact angle hysteresis (CAH) of 3.5°. In addition, the superhydrophobic showed good  chemical stability in the pH range of 4 to 8.

Improvement of Polypropylene Biological Interactions by using Superhydrophobic Surface Modification
E. Shirani, A. Razmjou,
Volume 36, Issue 4 (3-2018)
Abstract
The significance of producing superhydrophobic surfaces through modification of surface chemistry and structure is in preventing or delaying biofilm formation. This is done to improve biocompatibility and chemical and biological properties of the surface by creating micro-nano multilevel rough structure; and to decrease surface free energy by Fault Tolerant Control Strategy (FTCS) . Here, we produced a superhydrophobic surface through TiO2 coating and flurosilanization methods. Then, in order to evaluate the physicochemical properties of the modified surfaces, they were characterized by Scanning Electron Microscope (SEM), Fourier Transform Infrared Spectroscopy (FTIR), Contact Angle (CA), cell viability assay (using Hela and MCF-7 cancer cell lines as well as non-cancerous human fibroblast cells) by MTT, Bovine Serum Abumin (BSA) protein adsorption using Bradford and bacterial adhesion assay (Staphylococcus aureus and Staphylococcus epidermidis) using microtiter. Results showed that contact angle and surface energey of superhydrophobic modified surface increased to 150° and decreased to 5.51 mj/m2, respectively due to physicochemical modifications of the surface. In addition, the results showed a substantial reduction in protein adsorption and bacterial cell adhesion in superhydrophobic surface.

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