Multifunctional hollow superhydrophobic SiO2 microspheres with robust and self-cleaning and separation of oil/water emulsions properties

Wang

J Polym Sci B Polym Phys

et al. 2019

Superhydrophobic polycaprolactone (PCL) membranes with hierarchical structure were fabricated via alternate electrospinning/electrospraying techniques. Electrospun PCL/methyl silicone oil (PCL/MSO) nanofibers were employed as substrate. PCL/MSO‐PCL microspheres (PCL/MSO‐PCLMS) hierarchical membrane was prepared via electrosprayed PCLMS as an additional layer on the substrate. Field emission scanning electron microscopy images showed the formation of hierarchical PCL/MSO‐PCLMS membranes. Compared to pure PCL fibers substrate (120 ± 1.3°), the water contact angle (WCA) of MSO‐modified PCL membrane was 142 ± 0.7°. The most interesting observation was that the WCA of PCLMS without any modification could be achieved to 146 ± 2.8°. On this basis, PCL/MSO‐PCLMS hierarchical membrane possessed superhydrophobic surface with 150 ± 0.6° of WCA. The excellent surface roughness and air‐pocket capacity of hierarchical membranes would make the membranes more hydrophobic. The maximum oil (n‐hexane) adsorption capacity of PCL/MSO‐PCLMS membrane was 32.53 g g−1. Oil–water separation efficiencies of the superhydrophobic membranes were all higher than 99.93% after 10 cycles. The hierarchically structured PCL superhydrophobic membranes indicate the potential applications of environmentally friendly biopolymers as separation membranes. © 2019 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2019, 57, 421–430

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

Preparation of hierarchically structured PCL superhydrophobic membrane via alternate electrospinning/electrospraying techniques

Wang

J Polym Sci B Polym Phys

et al. 2019

“…The superhydrophobic coatings inspired by objects in nature have gained considerable attention for various applications such as self-cleaning, [1][2][3][4] antifogging, [5,6] drag reduction, [7] anti-icing, [8] antireflective, [9,10] and oil/water separation. [11,12] In general, practicability, scalability, and good chemical and mechanical stability of superhydrophobic coatings are required for their practical use, but multifunctionality of superhydrophobic coatings has been a new focus of academic and industrial interest.…”

Section: Introductionmentioning

confidence: 99%

Chemically Resistant, Electric Conductive, and Superhydrophobic Coatings

Saddiqi

Seeger

2019

Adv Materials Inter

J of Applied Polymer Sci

“…Superhydrophobic materials, displaying a high water contact angle (WCA > 150 ), have garnered much attention for many emerging applications such as anti-icing, antifogging, selfcleaning materials, oil-water separation materials, and so on. [1][2][3][4][5] Nowadays, driven by the pressure from the increasing concerns of large amount of oily effluent and frequent oil spill accidents, separation of oil-water mixture has been a significant and urgent issue. Superhydrophobic materials for selectively absorbing oil or directly separating oil from oil-water mixture have opened up a very interesting way to solve this problem.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of durable superhydrophobic and superoleophilic cotton fabric with fluorinated silica sol via sol–gel process

Jiang

Liu

Sun

et al. 2018

Superhydrophobic and superoleophilic cotton fabric was successfully prepared with fluorinated silica sol via a facile sol–gel method. A fluorinated polymeric sol–gel precursor (PHFBMA‐MTS) was synthesized via free‐radical polymerization by using hexafluorobutyl methacrylate (HFBMA) in the presence of (3‐mercaptopropyl)trimethoxysilane (MTS) as the chain transfer agent, which led to the formation of fluoropolymer with alkoxysilane end groups. Then the fluorinated silica sol was prepared by introducing PHFBMA‐MTS as the co‐precursor of tetraethylorthosilicate (TEOS) in the sol–gel process with ammonium hydroxide as the catalyst, which was then used to fabricate superhydrophobic and superoleophilic fabric coatings through a simple dip‐coating method. The coated fabrics showed superhydrophobic property with a high water contact angle of 154.1° and superoleophilic property with an oil contact angle of 0°. Moreover, the coated fabrics still kept superhydrophobicity even after ultrasonic treatment, as well as for organic solutions, acidic solutions. Thus, the coated fabrics were successfully applied to separate oil–water mixture with separation efficiency up to 99.8%. More importantly, the separation efficiency had no significant change after 20 cycles of oil–water separation. These present a simple, low‐cost, and durable approach to achieve industrialized application of coated fabrics in oil–water separation. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019, 136, 47005.