Reduction dependent wetting properties of graphene oxide

Perrozzi, Francesco; Croce, Salvatore; Treossi, Emanuele; Palermo, Vincenzo; Santucci, S.; Fioravanti, Giulia; Ottaviano, L.

doi:10.1016/j.carbon.2014.05.052

Cited by 54 publications

(30 citation statements)

References 31 publications

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“…It is easy to predict that wettability decreases as the time of reduction of the base solution increases, due to lower amount of polar substituents into the graphene molecule after reduction. Contact angle rises of about 25° -30° passing from GO membrane to a r-GO membrane; this result is confirmed in literature, although upon a different reduction way [31]. However, for reduced membranes, it is possible to notice that CA values do not vary significantly, but only a slight increase is visible.…”

Section: Contact Angle Measurements Casupporting

confidence: 84%

Preparation and characterization of graphene oxide based membranes as possible Gas Diffusion Layers for PEM fuel cells with enhanced surface homogeneity

Migliavacca

Latorrata

Stampino

et al. 2017

Materials Today: Proceedings

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The aim of this work is to define and optimize a process to produce a membrane made of reduced graphene oxide, r-GO, aiming to use it as Gas Diffusion Layer, GDL, in a Polymer Electrolyte Membrane Fuel Cell, PEMFC. Some works have reported that r-GO could reach conductivity values of about 10 4 S/m; by using the "self-assembling" properties of GO, it would be possible to obtain a GDL with enhanced homogeneity, which maintains a good electronic conductivity. A reduction process of GO in aqueous solution was developed in order to get the desired conductivity value of the final product. The membrane was characterized through several techniques to assess key parameters and to understand its properties. In this work it was possible to obtain a membrane which has a maximum contact angle of 86° and a conductivity of about 421 S/m.

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Section: Contact Angle Measurements Casupporting

confidence: 84%

Preparation and characterization of graphene oxide based membranes as possible Gas Diffusion Layers for PEM fuel cells with enhanced surface homogeneity

Migliavacca

Latorrata

Stampino

et al. 2017

Materials Today: Proceedings

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“…However, the validity of the Owens‐Wendt model for rGO is supported by the linearity of the curve. The scattered points were attributed to the high polarity of rGO, and the high value of

γ_{normals}^{normalp}

\frac{γ_{normall} true(1 + normalcos θ true)}{\sqrt{γ_{l}^{d}}} = \sqrt{γ_{s}^{p}} (|, \frac{\sqrt{γ_{l}^{p}}}{\sqrt{γ_{l}^{d}}}) + \sqrt{γ_{s}^{d}}

where θ is the contact angle,

γ_{normals}

is the surface free energy of rGO,

γ_{normall}

is the surface free energy of the liquid.…”

Section: Resultsmentioning

confidence: 99%

“…However, the validity of the Owens-Wendt model for rGO is supported by the linearity of the curve. The scattered points were attributed to the high polarity of rGO, and the high value of g p s [34].…”

Section: Resultsmentioning

confidence: 99%

Tuning the mechanical and electrical conductivity properties of graphene‐based thermoplastic starch/poly(lactic acid) hybrids

2018

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Environmentally friendly approaches were followed to develop thermoplastic starch (TPS)/poly(lactic acid) (PLA) extruded hybrids at 70:30 and 30:70 compositions, with the incorporation of reduced graphene oxide at 1.0, 3.0, and 5.0 mass% contents. Glucose was chosen as reagent to reduce graphene oxide (GO) to the rGO sample. Theoretical models predicted that the final location of rGO was at the interface of the components. The adhesion between the polymeric phases in the hybrids, observed by scanning electron microscopy, and the improved compatibilization suggested by mechanical and dynamic mechanical analyses indicated that a large fraction of rGO platelets were at the interface. X‐ray diffraction showed that rGO acted as a nucleating agent for PLA and revealed a better dispersion of rGO lamellae within TPS. Consequently, the phase composition of the TPS/PLA/rGO hybrids played an important role on the properties of the hybrids. For the neat TPS/PLA blend at 70:30 composition, ɛmax = (4.7 ± 0.6)% and the electrical conductivity was found around 10−13 S/cm. The incorporation of rGO led to more flexible and to higher conductivity materials, with ɛmax = (15.1 ± 0.7)% and σ = 1.1 × 10−5 S/cm for the hybrid with rGO at 5.0 mass% content. POLYM. COMPOS., 40:E1131–E1142, 2019. © 2018 Society of Plastics Engineers

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“…The value is close to 30.5°, which indicates that the deionized water cannot wet the surface completely [24][25][26]. Therefore, in the spray drying process, most of spray droplets are volatilized so rapidly that the dried droplets tend to form sheets.…”

Section: Preparation and Characterizationmentioning

confidence: 92%

Preparation of re-constructed carbon nanosheet powders and their efficient lithium-ion storage mechanism

Cui

Zuo

et al. 2015

Electrochimica Acta

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Reduction dependent wetting properties of graphene oxide

Cited by 54 publications

References 31 publications

Preparation and characterization of graphene oxide based membranes as possible Gas Diffusion Layers for PEM fuel cells with enhanced surface homogeneity

Preparation and characterization of graphene oxide based membranes as possible Gas Diffusion Layers for PEM fuel cells with enhanced surface homogeneity

Tuning the mechanical and electrical conductivity properties of graphene‐based thermoplastic starch/poly(lactic acid) hybrids

Preparation of re-constructed carbon nanosheet powders and their efficient lithium-ion storage mechanism

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