Confinement effects of graphene oxide nanosheets on liquid–solid phase transition of water

Zokaie, Meymanat; Foroutan, Masumeh

doi:10.1039/c5ra21480g

Cited by 17 publications

(11 citation statements)

References 24 publications

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“…The surface roughness and chemical morphology are also important factors affecting the antiicing ability of the surface. It has been found that the freezing delay time of surface with nano‐roughness similar to critical nucleation radius is ten times longer compared with that with larger roughness …”

Section: Introductionmentioning

confidence: 99%

Transparent Electrothermal Film Defoggers and Antiicing Coatings based on Wrinkled Graphene

Zhen

Chai

et al. 2019

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The ORCID identification number(s) for the author(s) of this article can be found under https://doi.org/10.1002/smll.201905945. Fog, frost, ice, and other natural phenomena can inevitably affect human life and the function of equipment. Therefore, removal or prevention is an urgent problem to be solved. As a new type of 2D material, graphene possesses great application potential in defogging and antiicing. In this work, a graphene film with intentionally increased defects and uniformly distributed wrinkles is synthesized on copper-zinc alloy substrates by chemical vapor deposition, and transparent electrothermal film defoggers are prepared based on such material. The defoggers can completely remove fog within 5 s when supplying a safe voltage of 28 V. The surface resistance of the defoggers is sensitive to humidity and it can monitor the defogging process in real time. Such outstanding performance is attributed to the ultrafast evaporation mechanism, which can prevent excessive water accumulation. The antiicing performance of wrinkled graphene (WG) is further studied. The antiicing coatings can delay freezing for 1.25 h at −15 °C or 2.8 h at −10 °C. The superior performance of WG can be explained by its unique surface structure and nanoscale roughness. Taken together, WG is expected to be used in antifog glass, rearview mirror defogging, aircraft surface deicing, and other applications.

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Section: Introductionmentioning

confidence: 99%

Transparent Electrothermal Film Defoggers and Antiicing Coatings based on Wrinkled Graphene

Zhen

Chai

et al. 2019

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“…Graphene oxide (GO) has been considered a convenient substitute for graphene in important technological applications due to its remarkable electrical, mechanical and thermal properties. [1][2][3][4][5][6][7][8][9][10] The advantages of GO in relation to pure graphene are due to the drastic structural and electronic changes resulting from the functionalization of graphene with oxygen groups. [1][2][3][4][5][6][7][8][9][10] It is well known that the detailed atomic structure of GO is very difficult to obtain since this material is non-stoichiometric, presenting a wide variety of compositions which depend inherently on the route of synthesis.…”

Section: Introductionmentioning

confidence: 99%

Hydration peculiarities of graphene oxides with multiple oxidation degrees

Neto

Chaban²,

Fileti

2017

Phys. Chem. Chem. Phys.

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Hydration properties of graphene oxide (GO) are essential for most of its potential applications. In this work, we employ atomistic molecular dynamics simulations to investigate seven GO compositions with different levels of oxygenation. Two atomic charge models for GO are compared: (1, a simplified model) sp carbons are purely Lennard-Jones sites; (2, a CHELPG model) sp carbon charges are consistent with the CHELPG scheme. Structural properties were found to depend insignificantly on the charge model, whereas thermodynamics appeared very sensitive. In particular, the simplified model provides systematically stronger GO/water coupling, as compared to the more accurate model. For all GO compositions, hydration free energies are in the range of -5 to -45 kJ mol indicating that hydration is thermodynamically favourable even for modest oxidation degrees, thus differing drastically from the cases of pristine graphene and graphite. In general, it has been observed that as R increases the high oxidation degree obstructs the formation of new hydrogen bonds, which considerably affects their hydration properties. Although both the used charge models are qualitatively equivalent, the energy and number of hydrogen bonds have been shown to be sensitive to the charge set employed. In particular, the comparison shows that the simplified model tends to overestimate the GO/water interaction energy. The results and discussion presented herein provide a physical background for modern applications of GO, e.g. in electrodes of supercapacitors and inhibitors in processes involving biological molecules.

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“…Their results indicated that the ordering of interfacial liquid water on a graphene surface was the main reason for the facilitated heterogeneous nucleation [33]. Not only a promoting material, graphene and its derivatives can also restrain ice formation under specific conditions [22,34]. The exceptional Joule's heating effect and electrothermal effect of graphene-based composites have received much attention in the design of antiicing systems [35,36].…”

Section: Introductionmentioning

confidence: 99%

Patterning Configuration of Surface Hydrophilicity by Graphene Nanosheet towards the Inhibition of Ice Nucleation and Growth

et al. 2022

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Freezing of liquid water occurs in many natural phenomena and affects countless human activities. The freezing process mainly involves ice nucleation and continuous growth, which are determined by the energy and structure fluctuation in supercooled water. Herein, considering the surface hydrophilicity and crystal structure differences between metal and graphene, we proposed a kind of surface configuration design, which was realized by graphene nanosheets being alternately anchored on a metal substrate. Ice nucleation and growth were investigated by molecular dynamics simulations. The surface configuration could induce ice nucleation to occur preferentially on the metal substrate where the surface hydrophilicity was higher than the lateral graphene nanosheet. However, ice nucleation could be delayed to a certain extent under the hindering effect of the interfacial water layer formed by the high surface hydrophilicity of the metal substrate. Furthermore, the graphene nanosheets restricted lateral expansion of the ice nucleus at the clearance, leading to the formation of a curved surface of the ice nucleus as it grew. As a result, ice growth was suppressed effectively due to the Gibbs–Thomson effect, and the growth rate decreased by 71.08% compared to the pure metal surface. Meanwhile, boundary misorientation between ice crystals was an important issue, which also prejudiced the growth of the ice crystal. The present results reveal the microscopic details of ice nucleation and growth inhibition of the special surface configuration and provide guidelines for the rational design of an anti-icing surface.

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Confinement effects of graphene oxide nanosheets on liquid–solid phase transition of water

Abstract: In this work, the liquid–solid phase transition temperature of water confined between two graphene oxide (GO) sheets is investigated using molecular dynamics simulations.

Cited by 17 publications

References 24 publications

Transparent Electrothermal Film Defoggers and Antiicing Coatings based on Wrinkled Graphene

Transparent Electrothermal Film Defoggers and Antiicing Coatings based on Wrinkled Graphene

Hydration peculiarities of graphene oxides with multiple oxidation degrees

Patterning Configuration of Surface Hydrophilicity by Graphene Nanosheet towards the Inhibition of Ice Nucleation and Growth

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