Mechanically Stable Thermally Crosslinked Poly(acrylic acid)/Reduced Graphene Oxide Aerogels

Ha, Heonjoo; Shanmuganathan, Kadhiravan; Ellison, Christopher J.

doi:10.1021/acsami.5b00407

Cited by 136 publications

(98 citation statements)

References 33 publications

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“…c o m / l o c a t e / m a t d e s of GO aerogel for oils is mainly related to the siphoning effect caused by the porous structure of the aerogel and the good compatibility between chains of oils and hydrophobic C\ \C structure of GO layers [18,28]. However, during the waste water treatment, there is an inevitable problem that the three dimensional (3D) porous structure of the GO aerogel could collapse due to the intrinsic fragility characteristic of the GO aerogel and the strong interaction between GO layers and solvent molecules [29,30]. This problem limits the cyclic utilization of GO aerogel to a great degree and even causes the secondary pollution to the water environment.…”

Section: Contents Lists Available At Sciencedirectmentioning

confidence: 99%

“…Therefore, the structure stability in solvents and the mechanical strength are important issues for the practical application of GO aerogels. Many chemical and physical strategies have been developed to enhance the stability and mechanical strength of the GO aerogel [16,23,29,[31][32][33][34], including introducing cross-linking agents [29,31], metal or metal oxide nanoparticles [32], layered double hydroxides [23], nano-fibrillated celluloses [33], carbon nanotubes [16,34], etc. Among which adding the cross-linking agent is a relatively simple and efficient method.…”

Section: Contents Lists Available At Sciencedirectmentioning

confidence: 99%

“…The cross-linking agent can adhere on the GO layers and connect GO layers with adjacent ones, while the aggregation of cross-linking agent endows them with relatively high strength and stability. Therefore, the 3D porous structure of the GO aerogel can be stabilized or strengthened to a great degree [29]. However, it should be noticed that GO layers are partially covered by cross-linking agent, which might discount the adsorption efficiency of the GO aerogel, especially when the cross-linking agent doesn't exhibit any adsorption ability.…”

Section: Contents Lists Available At Sciencedirectmentioning

confidence: 99%

“…Consequently, the 3D structure is completely destroyed and GO layers disperse into the solvents. Moreover, Fe 3 O 4 /graphene [41], reduced GO [40], rGO/Poly(-acrylic acid) [29], Poly(vinyl alcohol)/Cellulose nanofibrils/GO [33], GO/layered double hydroxides [23] and graphene/Cellulose [42] aerogels are less stable in water, and Graphene/polystyrene/Fe 3 O 4 [43], functionalized-rGO [44] and nitrogen-doped graphene [45] aerogels are stable in organic solvents with no detailing researches about their stabilities in water carried out. Therefore, it can be concluded that, compared to the reported works, the highest stability in different solvents endows the obtained PVA-supported GO aerogel with the highest application value in the field of waste water treatment.…”

Section: Structure Stability and Mechanical Stabilitymentioning

confidence: 99%

“…Not reported Reduced GO (rGO) 41 − Not reported rGO/poly(acrylic acid) 29 − Not reported Poly(vinyl alcohol)/cellulose Nanofibrils/GO 33 − Not reported GO/layered double hydroxides 23 + Not reported Graphene/cellulose 42 + + + Graphene/polystyrene/Fe 3 O 4 43 Not reported + Functionalized-rGO 44 Not reported ++ Nitrogen-doped graphene 45 Not reported ++ Fig. 3.…”

Section: Aerogelmentioning

confidence: 99%

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High structure stability and outstanding adsorption performance of graphene oxide aerogel supported by polyvinyl alcohol for waste water treatment

et al. 2016

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Section: Contents Lists Available At Sciencedirectmentioning

confidence: 99%

Section: Contents Lists Available At Sciencedirectmentioning

confidence: 99%

Section: Contents Lists Available At Sciencedirectmentioning

confidence: 99%

Section: Structure Stability and Mechanical Stabilitymentioning

confidence: 99%

Section: Aerogelmentioning

confidence: 99%

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High structure stability and outstanding adsorption performance of graphene oxide aerogel supported by polyvinyl alcohol for waste water treatment

et al. 2016

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Highly Elastic and Conductive N‐Doped Monolithic Graphene Aerogels for Multifunctional Applications

Moon

Yoon

Chun

et al. 2015

Adv Funct Materials

113

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wileyonlinelibrary.comactuators, [ 6 ] and absorbers of environmental pollution. [ 2,7 ] Among graphenebased materials, graphene oxides (GOs) can be described as "up-and-coming" material candidates because they are thin, light, strong, environmentally friendly, and fl exible. They also have high surface area, excellent mechanical-chemical properties, and the ability to conduct electricity within 2D nanostructures. Many research groups [ 8 ] have reported the simple preparation of rGO aerogels from GO solution by hydrothermal and freeze-drying methods or etching methods, employing a spherical template/GO composite. The microstructural features of rGO aerogels make them some of the most promising building blocks for energy-related and environmental applications. This is because these features can greatly improve working-volume deformability, can form a multidimensional conduction network, and can provide 3D interfacing or intercalation with other system components (e.g., electrolytes, reactants). [ 8 ] However, the performance and diversity of such graphene aerogel conductors are limited by the lack of a suffi cient compressive modulus (that is, they are fragile and collapse under stress). [ 4,9 ] Aerogels usually have an extremely low density due to their relatively high rigidity and/or a rather low electrical conductivity (e.g., 0.12 S m −1 with a density of 5.10 mg cm −3 ). [ 10 ] These properties can result from an incomplete reduction if mild chemical reducing conditions are employed without thermal annealing. Zhao et al. [ 11 ] reported the development of a compression-tolerant rGO sponge supercapacitor with a polypyrrole coating, which is conductive and provides mechanical reinforcement. This work showed that the use of rGO sponges in conjunction with other materials can overcome some of the shortcomings of monolithic rGO sponges. Recently, Wu et al. [ 12 ] fabricated a spongy graphene material (density = 1.15 mg cm −3 ; conductivity = 0.37 S m −1 ) that showed compressive elasticity and a near-zero Poisson's ratio by using a solvo-thermal reaction and thermal annealing. The primary remaining challenge is the synthesis of additive-free monolithic rGO aerogels that preserve the low density, high conductivity, and good elasticity inherent in GO nanosheets.In this article, we describe the development of a facile approach for fabricating support-free monolithic nitrogen (N)-doped rGO aerogels using a simple hydrothermal method employing hexamethylenetetramine (HMTA) as a stabilizerThe simple synthesis of ultralow-density (≈2.32 mg cm −3 ) 3D reduced graphene oxide (rGO) aerogels that exhibit high electrical conductivity and excellent compressibility are described herein. Aerogels are synthesized using a combined hydrothermal and thermal annealing method in which hexamethylenetetramine is employed as a reducer, nitrogen source, and graphene dispersion stabilizer. The N-binding confi gurations of rGO aerogels increase dramatically, as evidenced by the change in pyridinic-N/quaternary-N ratio. The conductivity ...

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Ultrafast, Reversible Transition of Superwettability of Graphene Network and Controllable Underwater Oil Adhesion for Oil Microdroplet Transportation

Ding

Jiao

Wang

et al. 2018

Adv Funct Materials

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Recently, reversible surface superwettability has attracted enormous interest, and methods to shorten the cycle time of transition have also garnered the attention of researchers. Herein, a superhydrophobic, open-cell graphene network (OCGN) is fabricated via self-assembly of graphene oxide and vapor ejection. Owing to the special open-cell microstructure, the OCGNs can be transformed to be superhydrophilic rapidly within only 1 s by air plasma treatment. Moreover, the OCGNs with pure graphene composition have a high conductivity and show an ultrafast Joule heating rate of up to 20 °C s −1 at a voltage of 20 V. By means of this property, for the first time an ultrafast recovery of the superhydrophobicity for OCGNs by self-induced Joule heating with the shortest time of 1 min is reported. The mechanism of ultrafast, reversible transition is also explored specifically in this study. In addition, the superhydrophilic OCGNs show superoleophobicity in water and their underwater adhesion for oil droplets can be controlled by plasma treatment. Finally, the OCGNs with different oil adhesion properties are fabricated and the underwater oil microdroplet transportation is realized using OCGNs. Therefore, the OCGNs with smart surface can be an excellent candidate for achieving multifunctional superwettability of surfaces.

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Mechanically Stable Thermally Crosslinked Poly(acrylic acid)/Reduced Graphene Oxide Aerogels

Cited by 136 publications

References 33 publications

High structure stability and outstanding adsorption performance of graphene oxide aerogel supported by polyvinyl alcohol for waste water treatment

High structure stability and outstanding adsorption performance of graphene oxide aerogel supported by polyvinyl alcohol for waste water treatment

Highly Elastic and Conductive N‐Doped Monolithic Graphene Aerogels for Multifunctional Applications

Ultrafast, Reversible Transition of Superwettability of Graphene Network and Controllable Underwater Oil Adhesion for Oil Microdroplet Transportation

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