Rheology of graphene oxide suspended in yield stress fluid

Moraes, Lorena Rodrigues da Costa; Ribeiro, Hélio; Cargnin, Elyff; Andrade, Ricardo; Naccache, Mônica F.

doi:10.1016/j.jnnfm.2020.104426

Cited by 17 publications

(5 citation statements)

References 68 publications

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“…Therefore, oscillatory stress sweep parameters were evaluated only for inks containing EC and are summarized in Table 1. It can be observed that inks rGO‐EC10 and rGO‐EC15 have G′ higher than G″ in LVR, which indicates a prevailing solid‐like behavior 36 . The LVR is defined as the region where the ink can endure mechanical deformation without destroying the structure 37 .…”

Section: Resultsmentioning

confidence: 99%

“…It can be observed that inks rGO-EC10 and rGO-EC15 have G 0 higher than G 00 in LVR, which indicates a prevailing solid-like behavior. 36 The LVR is defined as the region where the ink can endure mechanical deformation without destroying the structure. 37 Following an almost constant value of G 00 in the LVR for these samples, the curve increases slowly, which means micro-cracks start to develop.…”

Section: Rheology and Printability Of Reduced Graphene Oxide/cellulos...mentioning

confidence: 99%

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Pad printing inks based on reduced graphene oxide and various cellulose binders: Rheological properties, printability and application in electrochemical sensors

Pavličková,

Đurđić,

Hatala

et al. 2023

J of Applied Polymer Sci

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Pad printing is not a widely used printing technique, but it offers the possibility of a simple, fast, and low‐cost production of various high‐resolution electrode structures. Here, the pad‐printed reduced graphene oxide (rGO) electrodes are prepared from pad‐printable inks containing rGO powder and different concentrations of two cellulose‐based polymers: ethylcellulose and cellulose acetate butyrate. The applicability of rGO inks for pad printing is analyzed according to their rheological parameters and printability. Based on viscosity, storage (G′) and loss modulus (G″) values, 10 wt% of ethylcellulose and 15 wt% of cellulose acetate butyrate appear to be most suitable for pad printing. The effect of polymer concentration on rGO electrodes homogeneity and mechanical stability is also evaluated. Cyclic voltammetry measurements for [Fe(CN)6]3−/4− redox system are performed with rGO/cellulose inks pad‐printed onto transparent conductive oxide substrates with the best results when using ethylcellulose as a binder. Finally, the square‐wave voltammetric method assesses the viability of rGO electrodes for the fast detection of ascorbic acid (detection limit of 15 μM) coupled with satisfactory precision (4.5%, n = 5) and long‐term stability during electrochemical measurements.

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Section: Resultsmentioning

confidence: 99%

Section: Rheology and Printability Of Reduced Graphene Oxide/cellulos...mentioning

confidence: 99%

Pad printing inks based on reduced graphene oxide and various cellulose binders: Rheological properties, printability and application in electrochemical sensors

Pavličková,

Đurđić,

Hatala

et al. 2023

J of Applied Polymer Sci

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“…The D band increase indicates the occurrence of oxidation, since intact crystalline structures such as graphite and graphene generally do not have a sharp or intense D band and the ratio between the relative intensities of these bands (ID/ IG) is smaller than in oxidized graphitic materials [ 24 ]. The samples produced showed ID/IG ratios close to 1.0, as seen in Table 2 , indicating the existence of defects in their structure, thus proving the formation of GO nanosheets [ 21 , 22 ].…”

Section: Resultsmentioning

confidence: 99%

“…In the last decade, the method developed by Hummers in 1958 [13] has been modified and widely used by several researchers to obtain graphene oxide [14,15], thus several modifications were made to improve this technique and its yield [16]. Studies on the use of different amounts of oxidizing agents [17,18], degree of oxidation [19], influence of reagents on the oxidation process [17] and structural quality of the nanosheets, were presented [9,15,16,[20][21][22][23]. Due to the different methods of obtaining graphene and its derivatives, in 2017 an ISO/TS 80004-13 (International Organization for Standardization, 2017) was created, listing the terms and definitions for graphene and the other two-dimensional carbon materials.…”

Section: Introductionmentioning

confidence: 99%

Micro Scalable Graphene Oxide Productions Using Controlled Parameters in Bench Reactor

et al. 2021

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The detailed study of graphene oxide (GO) synthesis by changing the graphite/oxidizing reagents mass ratios (mG/mROxi), provided GO nanosheets production with good yield, structural quality, and process savings. Three initial samples containing different amounts of graphite (3.0 g, 4.5 g, and 6.0 g) were produced using a bench reactor under strictly controlled conditions to guarantee the process reproducibility. The produced samples were analyzed by Raman spectroscopy, atomic force microscopy (AFM), x-ray diffraction (XDR), X-ray photoelectron spectroscopy (XPS), Fourier-transform infrared spectroscopy (FTIR) and thermogravimetry (TGA) techniques. The results showed that the major GO product comprised of nanosheets containing between 1–5 layers, with lateral size up to 1.8 µm with high structural quality. Therefore, it was possible to produce different batches of graphene oxide with desirable physicochemical characteristics, keeping the amount of oxidizing reagent unchanged. The use of different proportions (mG/mROxi) is an important strategy that provides to produce GO nanostructures with high structural quality and scale-up, which can be well adapted in medium-sized bench reactor.

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“…In the particular case of 2D particle suspensions and molten composites, several works report either Newtonian or non-Newtonian flow behavior, thixotropicity, macroscale superlubricity, capability of forming particle network under shear flow, the presence of negative-to-positive normal stress first difference, and rheological responses similar to rod-like liquid crystal polymers as the main under-flow features [ 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 ]. Except for the work by Arapov and coworkers [ 22 ], the aforementioned studies have been carried out at a single temperature (room temperature in most cases) or within a small range of temperatures.…”

Section: Introductionmentioning

confidence: 99%

Rheology of Conductive High Reactivity Carbonaceous Material (HRCM)-Based Ink Suspensions: Dependence on Concentration and Temperature

et al. 2022

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The present case study reports a shear rheological characterization in the temperature domain of inks and pastes loaded with conductive High Reactivity Carbonaceous Material (HRCM) consisting mainly of few-layers graphene sheets. The combined effect of filler concentration and applied shear rate is investigated in terms of the shear viscosity response as a function of testing temperature. The non-Newtonian features of shear flow ramps at constant temperature are reported to depend on both the HRCM load and the testing temperature. Moreover, temperature ramps at a constant shear rate reveal a different viscosity–temperature dependence from what is observed in shear flow ramps while maintaining the same filler concentration. An apparent departure from the well-known Vogel–Fulcher–Tamman relationship as a function of the applied shear rate is also reported.

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Rheology of graphene oxide suspended in yield stress fluid

Cited by 17 publications

References 68 publications

Pad printing inks based on reduced graphene oxide and various cellulose binders: Rheological properties, printability and application in electrochemical sensors

Pad printing inks based on reduced graphene oxide and various cellulose binders: Rheological properties, printability and application in electrochemical sensors

Micro Scalable Graphene Oxide Productions Using Controlled Parameters in Bench Reactor

Rheology of Conductive High Reactivity Carbonaceous Material (HRCM)-Based Ink Suspensions: Dependence on Concentration and Temperature

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