Tuning the Wetting Properties of SiO2-Based Nanofluids to Create Durable Surfaces with Special Wettability for Self-Cleaning, Anti-Fouling, and Oil–Water Separation
Abstract:Surfaces with special wettability have aroused lots of attention due to their broad applications in many fields. In this work, we systematically report selective and various fabrications of nanofluids based on readily available materials such as SiO 2 nanoparticles and polydimethylsiloxane to create superhydrophobic, superoleophobic, superhydrophilic/superoleophobic, and underwater superoleophobic coatings. The efficiency of prepared coatings is investigated on mineral rock plates as porous substrates via the … Show more
“…Multilayer polymer films and polymer coatings have become indispensable for the transport and storage of goods in many industries, offering a reliable, sanitary, and inexpensive solution to meet the demands of increasingly complex applications and environments. – These films can have sophisticated structures that take advantage of the properties of individual polymer layers (e.g., puncture resistance, gas permeability, UV protection) to produce multilayer films optimized for specific applications. For example, a food storage film may include a Nylon or ethylene vinyl alcohol (EVOH) barrier layer in addition to a polyolefin layer providing a moisture or oxygen barrier, structural support, and sealability.…”
The characterization of chemical reactions at the buried interface is critical to understand interfacial molecular interactions and improve interfacial properties like adhesion. Interface-sensitive sum frequency generation (SFG) vibrational spectroscopy can probe the buried interface in situ nondestructively. While SFG has been used to study many model polymer interfaces, it has never been applied to study multilayer polymer films produced on commercial coextrusion lines.Here, we apply SFG to elucidate the molecular details of chemical reactions at the buried interface in multilayer cast films consisting of maleic anhydride (MAH)-modified Tie layers promoting the adhesion between polyamide and polyethylene. We demonstrated the utility of SFG to identify the reaction products from the interfacial reaction between MAH and polyamide with varying MAH concentrations and to monitor changes of the interfacial molecular orientation. The developed approach is generally applicable to probe chemical reactions and molecular interactions at buried interfaces in multilayer polymer films.
“…Multilayer polymer films and polymer coatings have become indispensable for the transport and storage of goods in many industries, offering a reliable, sanitary, and inexpensive solution to meet the demands of increasingly complex applications and environments. – These films can have sophisticated structures that take advantage of the properties of individual polymer layers (e.g., puncture resistance, gas permeability, UV protection) to produce multilayer films optimized for specific applications. For example, a food storage film may include a Nylon or ethylene vinyl alcohol (EVOH) barrier layer in addition to a polyolefin layer providing a moisture or oxygen barrier, structural support, and sealability.…”
The characterization of chemical reactions at the buried interface is critical to understand interfacial molecular interactions and improve interfacial properties like adhesion. Interface-sensitive sum frequency generation (SFG) vibrational spectroscopy can probe the buried interface in situ nondestructively. While SFG has been used to study many model polymer interfaces, it has never been applied to study multilayer polymer films produced on commercial coextrusion lines.Here, we apply SFG to elucidate the molecular details of chemical reactions at the buried interface in multilayer cast films consisting of maleic anhydride (MAH)-modified Tie layers promoting the adhesion between polyamide and polyethylene. We demonstrated the utility of SFG to identify the reaction products from the interfacial reaction between MAH and polyamide with varying MAH concentrations and to monitor changes of the interfacial molecular orientation. The developed approach is generally applicable to probe chemical reactions and molecular interactions at buried interfaces in multilayer polymer films.
“…[1][2][3][4][5] Therefore, the fabrication of surfaces with unique dynamic omniphobicity has gained rapid momentum in the advancement of new materials. Interestingly, it has shown broad application prospects in a variety of elds, including selfcleaning, [6][7][8][9][10][11][12] anti-fouling, [10][11][12][13][14][15][16][17][18][19] anti-corrosion, 8,16-21 drag reduction 14,[21][22][23] and oil-water separation. 9,10,[24][25][26] Nepenthes is a representative dynamic omniphobic surface found in nature.…”
Section: Introductionmentioning
confidence: 99%
“…Interestingly, it has shown broad application prospects in a variety of elds, including selfcleaning, [6][7][8][9][10][11][12] anti-fouling, [10][11][12][13][14][15][16][17][18][19] anti-corrosion, 8,16-21 drag reduction 14,[21][22][23] and oil-water separation. 9,10,[24][25][26] Nepenthes is a representative dynamic omniphobic surface found in nature. Inspired by it, researchers have developed surfaces with dynamic omniphobicity that utilize a lubricantinfused structure.…”
A slippery lubricant-infused porous surface (SLIPS), which exhibited excellent dynamic omniphobicity, stability, self-cleaning, and self-repairing performances, was successfully fabricated utilizing biocompatible materials and a facile approach.
“…In nature, there are many examples of superhydrophobic surfaces possessing this special self-cleaning property such as butterfly wings, shark skin, and lotus leaves. − It is revealed that this property of the lotus leaf or the “Lotus effect” results from the rough morphology and the hydrophobic epicuticular wax covering the entire surface leaf. − Inspired by this discovery, many researchers have mimicked the “Lotus effect” by designing and fabricating artificial superhydrophobic surfaces using the combination of micro/nano or hierarchical morphologies and low surface energy materials. − However, besides the elemental factors constituting the superhydrophobicity of a surface-like surface roughness and hydrophobic material coating, the superhydrophobic surface has to be transparent for applications requiring high optical transmittance like solar cell panel protection . Therefore, several strategies for fabricating flexible transparent superhydrophobic structures have been reported.…”
Maintaining the surface of solar cell panels free from contaminants to ensure their efficiency is a time-consuming and tedious task. Therefore, several methods of fabricating artificial transparent superhydrophobic surfaces have been reported to overcome that problem. However, most of the proposed fabrication methods are unscalable due to their complexity. Herein, a facile and cost-effective roll-to-roll system to fabricate a highly flexible and optically transparent polydimethylsiloxane/polyurethane acrylate superhydrophobic (FTPPS) film was proposed. The superhydrophobicity of the film was achieved by the combination of the surface roughness�the ultraviolet curable polyurethane acrylate (PUA) microstructures and the low surface energy material coating�the thin polydimethylsiloxane layer coated on PUA structures using capillary force. The superhydrophobicity of the FTPPS film was carefully optimized using various designs of PUA micro-post and the material properties of the film were examined systematically by different characterization techniques. The highest measured static water contact angle (WCA) of the FTPPS film is 153.3°± 1.8 and its lowest water sliding angle is ∼9.5°± 0.2. Moreover, the film still exhibited high WCAs of more than 142°even after being impacted multiple times by an adhesive probe or sand grains. This result demonstrates the high mechanical durability and flexibility of the as-fabricated superhydrophobic film. Finally, the potential application of the film as a protective cover for solar cells was also illustrated through the consistent photovoltaic conversion efficiency of the solar cell module covered by the film compared to that of the uncovered solar panel.
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