Abstract
This paper focuses on the synthesis of super-hydrophobic membranes. The polymer used in this research is polystyrene (PS), which has low surface energy but not low enough to be characterized as a superhydrophobic material. As hydrophobicity is based on low energy surface and surface roughness, the electrospinning technique was selected as the manufacturing technique. N, N' dimethylformamide (DMF) was employed as the PS solvent. Two groups of PS/DMF solutions were investigated i.e. 20/80 and 35/65. To increase even more the hydrophobicity, nanoparticles of silica, graphene, cadmium, and zinc were dispersed into the PS/DMF solutions. In contrast to results previous published in literature, the PS/DMF weight ratio of 20/80 led to water contact angles (WCA) of 148º, which is higher than the contact angle for the 35/65 ratio, i.e. 143º. This fact seems to be due to the presence of non-evaporated solvent into the PS surface as the 35/65 solution was more viscous. The WCA for membranes with 0.5 wt. (%) of graphene reached 152º, 149º-153º for membranes with nanosilica addition, 151º with 5.0 wt. (%) CdS, and 153º, 163º and 168º with the addition of 5 wt. (%), 10 wt. (%) and 15 wt. (%) of ZnS, respectively.
Highlights
As discussed by Du et al.[1], knowledge of interfacial water structures near hydrophobic surfaces is essential for understanding important surface problems involving water
The results presented by Jiang et al.[8] ranged from water contact angle from 139° to 162° depending on the matrix/solvent ratio
This paper focuses on the development of hyper‐hydrophobic micro/nano-membranes produced by electrospinning of PS/DMF solutions doped with nanoparticles
Summary
Antonio Ferreira Ávilaa*, Aline Marques de Oliveirab, Glenda Ribeiro de Barros Silveira Lacerdab, Viviane Cristina Munhozb, Mayara Cele Gonçalves Santosb, Patricia Figueiredo Santosb, Matt Triplettc aGraduate Studies Program in Mechanical Engineering, Deparment of Mechanical Engineering, Universidade Federal de Minas Gerais – UFMG, Av. This paper focuses on the synthesis of super-hydrophobic membranes. To increase even more the hydrophobicity, nanoparticles of silica, graphene, cadmium, and zinc were dispersed into the PS/DMF solutions. In contrast to results previous published in literature, the PS/DMF weight ratio of 20/80 led to water contact angles (WCA) of 148°, which is higher than the contact angle for the 35/65 ratio, i.e. 143°. This fact seems to be due to the presence of non-evaporated solvent into the PS surface as the 35/65 solution was more viscous. (%) of graphene reached 152°, 149°-153° for membranes with nanosilica addition, 151o with 5.0 wt.
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