Above 170° water contact angle and oleophobicity of fluorinated graphene oxide based transparent polymeric films

Bharathidasan, T.; Narayanan, Tharangattu N.; Sathyanaryanan, S.; Sreejakumari, S.S.

doi:10.1016/j.carbon.2014.12.004

Cited by 90 publications

(44 citation statements)

References 39 publications

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“…That can be ascribed to the partially reduction of EDA-GO and TETA-GO and the introduction of Siloxane (Si-O-Si) network structure originated from APTMS and APTES, removing the oxygen functionalities located on the basal plane of graphene oxide and introducing Si element into the structure of graphene nanosheets, respectively. Therefore, the hydrophobic of the films was improved to some extent by bringing the above hydrophobic substance such as platelets or Si element into the nanocomposites via in situ polymerization [33].…”

Section: Mechanical Propertiesmentioning

confidence: 99%

Amine-graphene oxide/waterborne polyurethane nanocomposites: effects of different amine modifiers on physical properties

Jiang

Bian

et al. 2016

J Mater Sci

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To study the dispersity of different amine-graphene oxide (amine-GO) in polymer matrix and the interfacial interactions between functionalized graphene oxide and matrix, two kinds of modifiers-organoamine-and aminosilane-coupling agents-were used to functionalize graphene nanosheets to obtain functionalized graphene oxide/waterborne polyurethane nanocomposites by in situ polymerization. The chemical structure, morphology, and interlayer space of amine-GO nanoplatelets were confirmed by FT-IR, Raman, TGA, XPS, TEM, AFM, and XRD. The dispersity behaviors between different amineGOs and polymers were evaluated by FESEM. The thermal, mechanical, and hydrophobic properties of the nanocomposites were investigated by TGA, tensile testing machine, and water contact angle test, respectively. It was found that the tensile strength of nanocomposites was increased from 10.13 to 27.79 and 28.96 Mpa after the addition of amine-GO functionalized by APTMS and APTES, respectively. The better thermal stability and hydrophobicity of nanocomposites were also achieved by the addition of amine-GO, especially those modified by aminosilane-coupling agents. This study paves a new route for designing and developing chemically converted graphene oxide nanosheets/polymer nanocomposite materials by altering suitable amine-modifier to functionalize graphene oxide nanosheets and then optimizing the interphases between graphene oxide nanosheets and polymer matrices.

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Section: Mechanical Propertiesmentioning

confidence: 99%

Amine-graphene oxide/waterborne polyurethane nanocomposites: effects of different amine modifiers on physical properties

Jiang

Bian

et al. 2016

J Mater Sci

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“…The nanotube that formed after running the anodic oxidation process for 45 min and without heat treatment exhibited the biggest contact angle in water (140°) compared to the 47° value obtained for the polished surface or the one of 109° for the nanotubes obtained at 15 V and with heat treatment (Figure 3). Nanotubular morphology and the fluorine content are considered two factors that increase the surface´s hydrophobic nature [29][30][31][32][33]. Contact angles substantially increase for the nanotube surface; the layers with large contact angles display hydrophobic properties.…”

Section: Resultsmentioning

confidence: 99%

Influence of Heat Treatment and UV Irradiation on the Wettability of Ti35Nb10Ta Nanotubes

Lario¹,

Fombuena²,

Vicente³

et al. 2018

Metals

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Abstract:The implant osseointegration rate depends on the surface's topography and chemical composition. There is a growing interest in the anodic oxidation process to obtain an oxide layer with a nanotube morphology on beta titanium alloys. This surface treatment presents large surface area, nanoscale rugosity and electrochemical properties that may increase the biocompatibility and osseointegration rate in titanium implants. In this work, an anodic oxidation process was used to modify the surface on the Ti35Nb10Ta alloy to obtain a titanium nanotubes topography. The work focused on analyzing the influence of some variables (voltage, heat treatment and ultraviolet irradiation) on the wettability performance of a titanium alloy. The morphology of the nanotubes surfaces was studied by Field Emission Scanning Electron Microscopy (FESEM), and surface composition was analyzed by Energy Dispersive Spectroscopy (EDS). The measurement of contact angle for the TiO 2 nanotube surfaces was measured by a video contact angle system. The surface with the non photoinduced nanotubes presented the largest contact angles. The post-heat treatment lowered the F/Ti ratio in the nanotubes and decreased the contact angle. Ultraviolet (UV) irradiation of the TiO 2 nanotubes decrease the water contact angle.

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“…Notably, the hyperbolic nature of the Zisman plot is typical for rough superhydrophobic surfaces. 30,31 The superhydrophobic behaviour was also visualized by capturing a video about the water-repellent nature of the films (see the ESI †). Before performing photocatalytic tests, the optical properties of the P3HT film were probed by UV-vis spectroscopy (Fig.…”

Section: à2mentioning

confidence: 99%

Microstructuration of poly(3-hexylthiophene) leads to bifunctional superhydrophobic and photoreactive surfaces

et al. 2018

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In this paper, we present the first report on an organic conducting polymer film, which alone exhibits both superhydrophobicity and visible light photoactivity. The microstructure of poly(3-hexylthiophene) was optimized using controlled precipitation until superhydrophobic behavior was achieved. Photocatalytic tests employing visible light irradiation proved that polymer degrades the ethanol test molecule.Controlling the wettability of solid surfaces and solid/fluid interfaces is important for a myriad of applications. Surfaces with water contact angles higher than 1501 (superhydrophobicity) can exhibit self-cleaning effects, as found in lotus leaves in nature. 1,2For preparing artificial superhydrophobic interfaces, hydrophobic functionality and surface roughness are both needed. Typically, a microstructure is superimposed by nanostructures, and this dual roughness reduces the contact area between water and the surface, resulting in water-repellent properties.3,4 The second major class of self-cleaning surfaces is photocatalytic coatings, which chemically decompose organic pollutants upon light exposure -this process is known as photocatalysis. 5 The immobilization of photocatalyst nanoparticles in an appropriately structured binder or support material can lead to antimicrobial and self-cleaning properties, which expands the horizon of applications. State-of-the-art bifunctional materials, possessing superhydrophobic and photoreactive properties, 6 are semiconductor photocatalyst/organic polymer nanocomposites. 7,8 In such assemblies, low-energy hydrophobic polymers are employed as inert matrices to immobilize photocatalysts, exploiting their flexibility, low weight, impact resistance, and low cost. 9-11 At the same time, nanocomposite configuration has considerable drawbacks. Most importantly, the polymer binder might decrease the intrinsic photocatalytic activity of the inorganic component via both optical/electrical shielding and by forming a physical barrier between the photoactive surface and the material to be decomposed. In addition, photogenerated charge carriers may also degrade the binder itself, causing possible detachment of the composite from the substrate. In the search for conceptually new alternatives, conducting polymers (also called conjugated polymers or synthetic metals, CPs) deserve consideration as they may fulfil the above requirements alone, without the need for composite formation. The wettability of CPs depends greatly on their chemical structure and the used dopants.12 For example, a polypyrrole (PPy) film containing a perfluorinated dopant anion exhibited hydrophobicity (water contact angle 4901), while ClO 4 À -doped PPy was hydrophilic. 13 The synthesis of superhydrophobic CPs and the reversible control of their wettability between superhydrophobicity and superhydrophilicity were also demonstrated. 14,15 Although the photoactivity of CPs is well-known and has been exploited in organic solar photovoltaic 16 and photoelectrochemical cells, 17 photocatalytic studies of CPs alone ...

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Above 170° water contact angle and oleophobicity of fluorinated graphene oxide based transparent polymeric films

Cited by 90 publications

References 39 publications

Amine-graphene oxide/waterborne polyurethane nanocomposites: effects of different amine modifiers on physical properties

Amine-graphene oxide/waterborne polyurethane nanocomposites: effects of different amine modifiers on physical properties

Influence of Heat Treatment and UV Irradiation on the Wettability of Ti35Nb10Ta Nanotubes

Microstructuration of poly(3-hexylthiophene) leads to bifunctional superhydrophobic and photoreactive surfaces

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