An aerogel adsorbent with bio-inspired interfacial adhesion between graphene and MoS2 sheets for water treatment

Zhu, Wuqing; Lin, Yi; Kang, Wanwen; Quan, Haiyan; Zhang, Yuyuan; Chang, Ming Xian; Wang, Kun; Zhang, Min; Zhang, Wei-Bin; Li, Zhiqiang; Wei, Hongyang; Fan, Ting; Chen, Dongchu; Hu, Huawen

doi:10.1016/j.apsusc.2020.145717

Cited by 39 publications

(21 citation statements)

References 65 publications

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“…Subsequent intermolecular crosslinking resulted in the formation of PDA on the surface of CFs [23]. The PDA molecules provided much more abundant active anchoring sites such as catechol and imino, which could catch and strongly bind MoO 4 2+ through electrostatic attraction [25,26]. In the following hydrothermal reaction, the adsorbed MoO 4 2+ ions were transformed to MoS 2 nanosheets on the PDA@CF [27].…”

Section: Microstructure Of the Cf-mosmentioning

confidence: 99%

Growth of ultra-dense MoS2 nanosheets on carbon fibers to improve the mechanical and tribological properties of polyimide composites

et al. 2020

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To enhance the interface bonding of polyimide (PI)/carbon fiber (CF) composites, CFs were functionalized by introducing a polydopamine (PDA) transition layer, whose active groups provide absorption sites for the growth of molybdenum disulfide (MoS2) nanosheets and improve the bonding strength with PI. Uniform and dense MoS2 nanosheets with thicknesses of 30–40 nm on the surface of the PDA@CF were obtained via a subsequent hydrothermal method. As a result, the interface between the CF and the PI matrix becomes more compact with the help of the PDA transition layer and MoS2 nanosheets. This is beneficial in forming PI/CF-MoS2 composites with better thermal stability, higher tensile strength, and enhanced tribological properties. The lubricating and reinforcing effects of the hybrid CF-MoS2 in the PI composite are discussed in detail. The tensile strength of the PI/CF-MoS2 composite increases by 43%, and the friction coefficient and the wear rate reduce by 57% and 77%, respectively, compared to those of the pure PI. These values are higher than those of the PI/CF composites without MoS2 nanosheets. These results indicate that the CF-MoS2 hybrid material can be used as an additive to improve the mechanical and tribological properties of polymers.

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Section: Microstructure Of the Cf-mosmentioning

confidence: 99%

Growth of ultra-dense MoS2 nanosheets on carbon fibers to improve the mechanical and tribological properties of polyimide composites

et al. 2020

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“…Interestingly, the contribution of the surface atomic composition of sp 2 CC species to the C 1s core level decreased from 78.91% to 77.21%, 77.15%, and 76.64% as the deposition time increased from 5 to 10, 15, and 20 min. This demonstrates a definite influence of the thickness of the G mesolayer on its chemical properties, in this case exhibited by the presumed G deoxygenation effects. , Namely, the reduction in the atomic proportion of CC bonds occurs at the cost of increasing the proportion of CO bonds, involving the oxygen atoms from the G layer.…”

Section: Resultsmentioning

confidence: 80%

Taking Hydroxyapatite-Coated Titanium Implants Two Steps Forward: Surface Modification Using Graphene Mesolayers and a Hydroxyapatite-Reinforced Polymeric Scaffold

Fathi

Ahmed

Afifi

et al. 2020

ACS Biomater. Sci. Eng.

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Coating with hydroxyapatite (HAP) presents a mainstream strategy for rendering bioinert titanium implants bioactive. However, the low porosity of pure HAP coatings does not allow for the infiltration of the surface of the metallic implant with the host cells. Polymeric scaffolds do enable this osseointegration effect, but their bonding onto titanium presents a challenge because of the disparity in hydrophilicity. Here, we demonstrate the inability of a composite scaffold composed of carbonated HAP (CHAP) nanoparticles interspersed within electrospun ε-polycaprolactone (PCL) nanofibers to bind onto titanium. To solve this challenge, an intermediate layer of graphene nanosheets was deposited in a pulsed laser deposition process, which facilitated the bonding of the scaffold. The duration of the deposition of graphene (0, 5, 10, 15, and 20 min) and the thickness of its mesolayer affected numerous physical and chemical properties of the material, including the surface atomic proportion of carbon bonds, the orientation and interlinking of the polymeric nanofibers, and the surface roughness, which increased in direct proportion with the thickness of the graphene mesolayer. Because the polymeric scaffold did not adhere onto the surface of pure titanium, no cells were detected growing on it in vitro. In contrast, human fibroblasts adhered, spread, and proliferated well on all the substrates sputtered with both graphene and the composite scaffold. The orientations of cytoskeletal filopodia and lamellipodia were largely determined by the topographic orientation of the nanofibers and the geometry of the surface pores, attesting to the important effects that the presence of a scaffold has on the cellular behavior. The protection of titanium from corrosion in the simulated body fluid (SBF) was enhanced by coating with graphene and the composite scaffold, with the most superior resistance to the attack of the corrosive ions being exhibited by the substrate subjected to the shortest duration of the graphene deposition because of the highest atomic ratio of C–C to C–O bonds detected in it. Overall, some properties of titanium, such as roughness and wettability, were improved monotonously with an increase in the thickness of the graphene mesolayer, while others, such as cell viability and resistance to corrosion, required optimization, given that they were diminished at higher graphene mesolayer thicknesses. Nevertheless, every physical and chemical property of titanium analyzed was significantly improved by coating with graphene and the composite scaffold. This type of multilayer design evidently holds a great promise in the design of biomaterials for implants in orthopedics and tissue engineering.

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“…Carbon nanomaterials, especially graphene and its derivatives have been widely used for the design and synthesis of various adsorbent materials. 107,108 In addition, CNTs, 109,110 CNFs, 110,111 fullerenes, 112 and graphite 113 have also shown promising applications for this aim.…”

Section: Water Purificationmentioning

confidence: 99%

Carbon nanofiber-based three-dimensional nanomaterials for energy and environmental applications

et al. 2020

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An aerogel adsorbent with bio-inspired interfacial adhesion between graphene and MoS2 sheets for water treatment

Cited by 39 publications

References 65 publications

Growth of ultra-dense MoS2 nanosheets on carbon fibers to improve the mechanical and tribological properties of polyimide composites

Growth of ultra-dense MoS2 nanosheets on carbon fibers to improve the mechanical and tribological properties of polyimide composites

Taking Hydroxyapatite-Coated Titanium Implants Two Steps Forward: Surface Modification Using Graphene Mesolayers and a Hydroxyapatite-Reinforced Polymeric Scaffold

Carbon nanofiber-based three-dimensional nanomaterials for energy and environmental applications

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