Multilayer Graphene Films Obtained by Dip Coating Technique

Machuno, Luís Gustavo Baptista; Oliveira, Alex Ricardo; Furlan, Renan Hermógenes; Lima, Anderson Barbosa; Morais, Luís Carlos de; Gelamo, Rogério Valentim

doi:10.1590/1516-1439.005415

Cited by 35 publications

(13 citation statements)

References 25 publications

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“…Very little research has been reported that relates the usage of more than 10 layers of graphene. Recently, the demonstration of the use of more than 30-layer MLG was reported [ 28 , 29 ]. Basically, the synthesis of MLG is much more cost effective and simple than single layer graphene.…”

Section: Introductionmentioning

confidence: 99%

Simple Technique of Exfoliation and Dispersion of Multilayer Graphene from Natural Graphite by Ozone-Assisted Sonication

et al. 2017

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Owing to its unique properties, graphene has attracted tremendous attention in many research fields. There is a great space to develop graphene synthesis techniques by an efficient and environmentally friendly approach. In this paper, we report a facile method to synthesize well-dispersed multilayer graphene (MLG) without using any chemical reagents or organic solvents. This was achieved by the ozone-assisted sonication of the natural graphite in a water medium. The frequency or number of ozone treatments plays an important role for the dispersion in the process. The possible mechanism of graphene exfoliation and the introduction of functional groups have been postulated. The experimental setup is unique for ozone treatment and enables the elimination of ozone off-gas. The heat generated by the dissipation of ultrasonic waves was used as it is, and no additional heat was supplied. The graphene dispersion was stable, and no evidence of aggregation was observed---even after several months. The characterization results show that well-dispersed MLG was successfully synthesized without any significant damage to the overall structure. The graphene obtained by this method has potential applications in composite materials, conductive coatings, energy storage, and electronic devices.

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Section: Introductionmentioning

confidence: 99%

Simple Technique of Exfoliation and Dispersion of Multilayer Graphene from Natural Graphite by Ozone-Assisted Sonication

et al. 2017

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“…In all the structures, the color change was clearly observed as the coating cycle progressed, and, accordingly, the weight and thickness increased linearly. The dip-coating process using the graphene coating solution is e cient and has a great in uence on increasing electrical conductivity for electrical signal sensing 42 . In particular, the number of dip-coatings has a clear correlation with physical durability and electrical conductivity and varies from a few to as many as 20 times depending on the study 43,44 .…”

Section: Resultsmentioning

confidence: 99%

Design and Evaluation of 3D-Printed 4 Structures Coated By CWPU/Graphene as Strain Sensor: Truss, Honeycomb, Chiral Truss, Re-entrant

Choi

Shin

Lee

2021

Preprint

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A strain sensor characterized by elasticity has recently been studied in various ways to be applied to monitoring humans or robots. Here, 4 types of 3D-printed auxetic lattice structures using thermoplastic polyurethane (TPU) as raw material were characterized: truss and honeycomb with positive Poisson's ratio and chiral truss and re-entrant with negative Poisson's ratio. Each structure was fabricated as a flexible and stable strain sensor by coating graphene through a dip-coating process. The fabricated auxetic structures have excellent strength, flexibility, and electrical conductivity desirable for a strain sensor and detect a constant change in resistance at a given strain. The 3D-printed auxetic lattice 4 type structures coated with CWPU/Graphene suggest potential applications of multifunctional strain sensors under deformation.

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“…In this work, graphene was mixed with the cutting fluids. Graphene platelets were produced by the mechanical exfoliation of natural graphite, as described in [20]. The dispersion of 0.05 and 0.1%wt of the graphene in the cutting fluids was performed using an ultrasonic bath system until the complete dispersion of the graphene particles in the studied fluid occurred.…”

Section: Experimental Procedures 21 Characterization Of Materialsmentioning

confidence: 99%

Effect of Graphene Addition in Cutting Fluids Applied by MQL in End Milling of AISI 1045 Steel

Baldin

Silva

Houck³

et al. 2021

Lubricants

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The cutting fluids applied to the machining processes by the MQL process aim to reduce the machining temperatures and tool wear as well as improve the surface and dimensional finishing of the parts. To increase the efficiency of these fluids, graphene lubricating platelets are added. This work investigated the performance of three different cutting fluids with graphene sheets added and applied via MQL, considering the tool life, wear, and wear mechanisms acting on TiAlN-coated cemented carbide cutting tools in the end milling of AISI 1045 steel. We evaluated two vegetable- (MQL15 and LB1000) and one mineral-based (MQL14) neat oils and the same fluids with the addition of 0.05 and 0.1%wt graphene nanoplatelets. Dry cuts were also performed and investigated for comparison. The experiments were conducted under fixed cutting conditions (vc = 250 m/min, fz = 0.14 mm/tooth, ap = 1 mm, and ae = 20 mm). The end-of-tool-life criterion followed the guidelines of ISO 8688-1 (1989). To analyze the results, ANOVA and Tukey’s test were applied. The addition of graphene sheets in the vegetable-based cutting fluids effectively increased the lubricating properties, partially reducing the wear mechanisms acting on the tools. In addition, there was a predominance of thermal fatigue cracks and mechanical cracks as well as adhesive and abrasive wear mechanisms on the tools used in the cutting with the MQL15 and MQL14 fluids, indicating greater cyclical fluctuations in temperature and surface stresses.

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Multilayer Graphene Films Obtained by Dip Coating Technique

Cited by 35 publications

References 25 publications

Simple Technique of Exfoliation and Dispersion of Multilayer Graphene from Natural Graphite by Ozone-Assisted Sonication

Simple Technique of Exfoliation and Dispersion of Multilayer Graphene from Natural Graphite by Ozone-Assisted Sonication

Design and Evaluation of 3D-Printed 4 Structures Coated By CWPU/Graphene as Strain Sensor: Truss, Honeycomb, Chiral Truss, Re-entrant

Effect of Graphene Addition in Cutting Fluids Applied by MQL in End Milling of AISI 1045 Steel

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