Formation, Stability, and Coagulation of Fullerene Organosols: C70 in Acetonitrile–Toluene Solutions and Related Systems

Mchedlov‐Petrossyan, Nikolay O.; Marfunin, Mykyta O.

doi:10.1021/acs.langmuir.1c00722

Cited by 7 publications

(36 citation statements)

References 69 publications

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“…In this paper, the composition of the binary and ternary solvents is expressed in volume percents, like in the previous publication. 20 The characterization of the systems is given in the Results and Discussion section.…”

Section: Methodsmentioning

confidence: 99%

“…The procedure was described in the previous paper. 20 After mixing and equilibrating the solution components, the measurements were made at 25 °C. In the coagulation studies, the aliquot of the stock solution of fullerene was added last, after dilution of the electrolytes, in order to avoid premature coagulation.…”

Section: Determination Of the Critical Coagulationmentioning

confidence: 99%

“…6,7 Previous publications from this laboratory were devoted to the interaction with electrolytes and coagulation of C 60 in acetonitrile 16−18 and methanol 19 and to C 70 in the same solvents. 20 It seems to be reasonable because the absolute majority of coagulation studies of fullerene colloids is centered on the aqueous systems. Also, the behavior of fullerenes in the mixtures of the mentioned polar solvents with benzene and toluene was considered.…”

Section: Introductionmentioning

confidence: 99%

“…Also, the behavior of fullerenes in the mixtures of the mentioned polar solvents with benzene and toluene was considered. 16−20 The last of these publications showed the feasibility of a comparative study of organosols and hydrosols, 20 namely, the dramatic difference between the values of the critical concentration of coagulation, CCC, in water and in acetonitrile or methanol can be explained by the presence of a strong stabilizing factor of the hydrosols. In the terms proposed by Churaev and Derjaguin, it is the so-called structural effect.…”

Section: Introductionmentioning

confidence: 99%

“…In the terms proposed by Churaev and Derjaguin, it is the so-called structural effect. 20 In addition to the previous consideration of fullerenes in solution, 21 a new review of fullerene hydrosols and aqueous suspensions was published 22 and supplemented with an experimental study of colloidal stability of a C 70 hydrosol. 23 Such results, however, were obtained basing mainly on methanol and acetonitrile.…”

Section: Introductionmentioning

confidence: 99%

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Unexpected Colloidal Stability of Fullerenes in Dimethyl Sulfoxide and Related Systems

et al. 2022

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It is known that fullerenes are poorly soluble in polar solvents, but readily form colloidal solutions in such media. These solutions are typically solvophobic (hydrophobic when prepared in water), that is, thermodynamically unstable colloidal systems with negatively charged particles. To understand the stability factors of a colloidal system, the thresholds for coagulation of a sol or suspension by electrolytes are of key importance. While hydrosols and aqueous suspensions coagulate at concentrations of 1:1 inorganic electrolytes about 0.1− 0.2 M, in acetonitrile and methanol, the corresponding critical concentrations of coagulation are ca. 3 orders of magnitude lower. Given the wide variety of properties of organic solvents, it seemed important to complete the picture to study solvents with more basic properties. This is all the more reasonable since electrophilic fullerenes are in fact Lewis acids. Our choice was dimethyl sulfoxide, DMSO, and related solvent systems. The colloidal solutions of fullerenes C 60 and C 70 in DMSO and N,N-dimethyl formamide, DMF, are unexpectedly easy to prepare by mechanical methods, and addition of water leads to formation of relatively stable organo-hydrosols. UV−visible spectra and dynamic light scattering were used to characterize the solutions of C 60 and C 70 in DMSO, benzene−DMSO, acetonitrile−DMSO, and benzene−acetonitrile−DMSO systems, as well as in DMF. Our present study demonstrated that, in contrast to organosols in methanol and acetonitrile, colloids of C 70 and C 60 fullerenes in DMSO and DMF are surprisingly as stable with respect to electrolytes as the corresponding hydrosols are. Such high stability is caused by the non-DLVO interactions, or, in terms proposed by Churaev and Derjaguin, by the so-called structural effect. These results shed light on the nature of the solvation of colloidal fullerene particles in solvents of various chemical natures.

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Section: Methodsmentioning

confidence: 99%

Section: Determination Of the Critical Coagulationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Unexpected Colloidal Stability of Fullerenes in Dimethyl Sulfoxide and Related Systems

et al. 2022

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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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Behavior of C70 Fullerene in a Binary Mixture of Xylene and Tetrahydrofuran

Makhmanov,

Esanov,

Sidigaliev

et al. 2023

Preprint

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The self-organization properties of C70 fullerene molecules in a xylene/tetrahydrofuran binary mixture were studied for the first time by optical absorption, refractometry, and dynamic light scattering. A correlation has been established between the change in the refractive index of the C70/xylene/tetrahydrofuran solution and the degree of self-organization of C70 molecules in the medium at various concentrations and storage periods of the solution. It is shown that the features of the optical absorption spectrum of C70/xylene/tetrahydrofuran at a fixed low concentration of the fullerene are sensitive to its storage time. It was determined that the beginning time of the formation of C70 nanoclusters and their final size depend on the concentration of fullerene and the time of keeping the solution. The observed nature of the C70 fullerene solution in a binary mixture may help to elucidate the mechanism of self-organization in the future.

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Formation, Stability, and Coagulation of Fullerene Organosols: C₇₀ in Acetonitrile–Toluene Solutions and Related Systems

Cited by 7 publications

References 69 publications

Unexpected Colloidal Stability of Fullerenes in Dimethyl Sulfoxide and Related Systems

Unexpected Colloidal Stability of Fullerenes in Dimethyl Sulfoxide and Related Systems

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

<strong></strong>Behavior of C<sub>70</sub> Fullerene in a Binary Mixture of Xylene and Tetrahydrofuran

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