Nanostructure Evolution of Expanded Graphite during High-Energy Ball-Milling

Duan, Wen Yan

doi:10.4028/www.scientific.net/amm.80-81.229

Cited by 5 publications

(2 citation statements)

References 13 publications

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“…The X-ray diffractogram of GO shows three main diffraction peaks, the most intense at 2Ɵ value of 9.55 is typical of GO [37] and the peaks at 18.30 and 25.35 correspond to reduced graphene oxide (Figure 3). The X-ray diffractograms of GP and MG are very similar and show the main diffraction peak at 2Ɵ value of 26.40-26.55 which corresponds to the (002) plane of graphite [38], and small diffractions peaks at 2Ɵ values of 004) and (110) planes of graphite [39][40][41] also appear.…”

Section: Characterization Of the Graphene Derivatives (Go Gp Mg)mentioning

confidence: 91%

Structure and adhesion properties of waterborne poly(urethane urea)s containing small amounts of different graphene derivatives

Tounici

Martı́n-Martı́nez

2021

Journal of Adhesion Science and Technology

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Waterborne poly(urethane urea) (PUDs) containing graphene derivatives with different morphologies and surface polarities were synthesized via in situ polymerization by using the acetone method. Small amounts (0.04-0.30 wt.%) of graphene oxide (GO), graphite nanoplatelets (GP) or milled graphite (MG) were mixed with polyadipate of 1,4-butanediol polyol and added during synthesis of the PUDs. The addition of graphene derivatives changed differently the degree of micro-phase separation of the poly(urethane urea)s (PUs) depending on the balance between the extent of covalent interactions between the surface functional groups on the graphene sheets and the isocyanate groups, and the number of stacked graphene sheets. Whereas MG mainly intercalated between the soft segments showing a typical behavior of nanofiller, GP and, particularly, GO showed different degrees of micro-phase separation due to more net covalent interactions with the poly(urethane urea) chains which caused higher crystallinity. The addition of graphene derivative decreased the glass transition temperature of the hard segments and increased the percentages of associated by hydrogen bond urethane and urea groups, more noticeably by adding GP and MG. Lower temperatures of decomposition and higher amounts of urethane and urea hard domains, and soft domains were found in PU þ GO and PU þ MG, and they showed an additional structural relaxation at 11-16 C. PU and PU þ GP had higher thermal stabilities than PU þ GO and PU þ MG and the addition of GP and, more markedly, GO imparted toughening to the poly(urethane urea). The Tpeel strength values were higher in the joints made with PUD þ GO due to the more net covalent interactions between the surface functional groups on the GO sheets and the poly(urethane urea) chains. On the other hand, the lap-shear strength of the joints made with PUD þ MG and, in less extent, with PUD þ GP noticeably increased.

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Section: Characterization Of the Graphene Derivatives (Go Gp Mg)mentioning

confidence: 91%

Structure and adhesion properties of waterborne poly(urethane urea)s containing small amounts of different graphene derivatives

Tounici

Martı́n-Martı́nez

2021

Journal of Adhesion Science and Technology

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“…To the best of our knowledge, this is the first experimental evidence for improved dispersibility of GO sheets in silicone oil. The improved dispersibility obtained by combining ball milling and chemical exfoliation processes is derived from a narrow particle size distribution and a high degree of oxidation. − The size of the GO sheets was easily controlled by adjusting the ball-milling time. The ball-milling process transformed the morphology of the GO sheets into a spherical form.…”

Section: Introductionmentioning

confidence: 99%

Graphene Size Control via a Mechanochemical Method and Electroresponsive Properties

Shin

Lee

Hong

et al. 2014

ACS Appl. Mater. Interfaces

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Highly dispersible graphene oxide (GO) sheets of uniform submicrometer size were successfully fabricated from pristine graphite using a simple mechanochemical process. The GO flake morphology was transformed into a spherical form, and the density was decreased slightly via the ball-milling process. Ball-milled GO can be used as an electrorheological (ER) material because of its small particle size, low conductivity, and outstanding dispersibility in silicone oil. We found that the 2-h ball-milled GO-based ER fluid had the best ER performance (shear stress of 78.5 Pa and 630% ER efficiency), which was double that of the nonmilled GO-based ER fluid. The response time to form a fibrillar structure along the applied electric field direction and the recovery time to the starting level decreased with increasing ball-milling time. Additionally, the retarded settling velocity of isolated GO sheets and the electrostatic repulsion between oxygen functional groups on the GO sheets combined to improve the antisedimentation property. The ability to control the size of graphene sheets is a great opportunity to advance graphene commercialization in a high-quality, scalable production setting.

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Magnesium–carbon hydrogen storage hybrid materials produced by reactive ball milling in hydrogen

Lototskyy

Sibanyoni

Denys

et al. 2013

Carbon

133

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Nanostructure Evolution of Expanded Graphite during High-Energy Ball-Milling

Cited by 5 publications

References 13 publications

Structure and adhesion properties of waterborne poly(urethane urea)s containing small amounts of different graphene derivatives

Structure and adhesion properties of waterborne poly(urethane urea)s containing small amounts of different graphene derivatives

Graphene Size Control via a Mechanochemical Method and Electroresponsive Properties

Magnesium–carbon hydrogen storage hybrid materials produced by reactive ball milling in hydrogen

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