Electrostatic stabilization of multi-walled carbon nanotubes dispersed in nonaqueous media

Damasceno, João Paulo Vita; Zarbin, Aldo J. G.

doi:10.1016/j.jcis.2018.06.002

Cited by 12 publications

(10 citation statements)

References 66 publications

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“…However, studies on chemically modified electrodes have demonstrated that one of the main problems encountered in handling CNTs is the low ability of these materials to form dispersions. Literature [3,5,[18][19][20][21]41] has shown a better CNT dispersion in organic solvents, since in the function of the synthesis, the CNT arrangement is organized in bundles, in which the pipes are held together by Van de Waals intense interactions [5,41,42]. Therefore, systematic studies concerning dispersion/ interaction between CNTs (functionalized or not) and organic solvents are very important for studies in electrode modification [18,20].…”

Section: Dispersing Agent Studymentioning

confidence: 99%

Multi-walled carbon nanotube functionalization and the dispersing agents study applied for the glassy carbon electrode modification and voltammetric reduction of nitrofurazone

Brito

Ferreira

La-Scalea

2020

J Solid State Electrochem

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Multi-walled carbon nanotubes (MWCNTs) have structures characterized by remarkable mechanical and electronic properties. However, their applications can be hindered because of their hydrophobic nature, lack of homogeneity due to impurities, and their variable sizes. Thus, MWCNT was treated by acidic oxidation (H 2 SO 4 3:1 HNO 3 ), seeking out to evaluate the influence of this functionalization on the electrochemical reduction behavior of nitrofurazone applying cyclic voltammetry, the glassy carbon surface having been modified as working electrode. The MWCNT functionalization was characterized by using scanning electron microscopy, infrared and Raman spectroscopies, thermogravimetric analysis, and potentiometric titration. Differences between non-functionalized and functionalized MWCNT were observed, suggesting that carboxylic groups were introduced in the carbon nanotube walls. Moreover, the glassy carbon surface modification was also studied concerning the dispersing agents for functionalized MWCNT. Several solvents of different natures, hydrophilic and lipophilic, were evaluated. The best dispersion associated with electrochemical response of nitrofurazone was obtained with 1,3-dioxolane as dispersing agent, which presented higher affinity with MWCNT than the other solvents. The electrochemical response of the glassy carbon electrode modified with MWCNT was evaluated by nitrofurazone voltammetric behavior with emphasis on the R−NO 2 =R−NO Á− 2 couple generation and its kinetic stability.

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Section: Dispersing Agent Studymentioning

confidence: 99%

Multi-walled carbon nanotube functionalization and the dispersing agents study applied for the glassy carbon electrode modification and voltammetric reduction of nitrofurazone

Brito

Ferreira

La-Scalea

2020

J Solid State Electrochem

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“…Sonication was performed in both cases, and positive ζ values were observed only in the case of Cl-containing solvents. 17,18 We decided not to use the sonication in entire organic solvents because of possible unexpected side effects. For example, acidic admixtures appear in DMSO during sonication.…”

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confidence: 99%

Stability of Aqueous Suspensions of COOH-Decorated Carbon Nanotubes to Organic Solvents, Esterification, and Decarboxylation

Laguta

Mchedlov‐Petrossyan

Kovalenko

et al. 2022

J. Phys. Chem. Lett.

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Carbon nanotubes are among the most widely used nanosystems, and stability of carbon nanotube suspensions is critical for nanotechnology and environmental science. Remaining in aqueous environment alone misses important factors that regulate colloidal stability in the presence of electrolytes. Indeed, introduction of (80–95) vol % organic solvents leads to sharp changes in suspension properties depending on the solvent. For example, the critical coagulation concentrations for a given inorganic or organic coagulating ion can change by 2 orders of magnitude when going from dimethyl sulfoxide to acetonitrile. We establish and explain these trends by Lewis acid–base interactions and show that a strong interaction extending beyond the standard theory of aggregation plays an important role.

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“…Due to the low degree of functionalization and to their non-re-dispersibility after water addition (see Figure 4), dispersions 1d are lyophobic and the colloidal stability of those is provided by electrostatic repulsion. [19,[42][43][44][45] So, these dispersions can be considered as model to apply DLVO theory for carbon-based systems, [30] as has been done for fullerene dispersions made by other routes. [3,19,[44][45][46] Figure 5A presents a graphic of total interaction energy (U T ) as a function of distance for two identical spherical particles calculated based on DLVO theory, [47,48] considering the experimental radius (half of the diameters shown in Table S1) and zeta potentials for 1d dispersions, an approximate value for Hamaker constant (1 x 10 -19 J) from literature, [3] and 1:1 electrolyte (1 .…”

Section: Resultsmentioning

confidence: 99%

The role of functionalization on the colloidal stability of aqueous fullerene C60 dispersions prepared with fullerides

Damasceno

Hof

Chauvet

et al. 2021

Carbon

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Electrostatic stabilization of multi-walled carbon nanotubes dispersed in nonaqueous media

Cited by 12 publications

References 66 publications

Multi-walled carbon nanotube functionalization and the dispersing agents study applied for the glassy carbon electrode modification and voltammetric reduction of nitrofurazone

Multi-walled carbon nanotube functionalization and the dispersing agents study applied for the glassy carbon electrode modification and voltammetric reduction of nitrofurazone

Stability of Aqueous Suspensions of COOH-Decorated Carbon Nanotubes to Organic Solvents, Esterification, and Decarboxylation

The role of functionalization on the colloidal stability of aqueous fullerene C60 dispersions prepared with fullerides

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