Effect of C60 fullerene on the boiling point of its solutions in some aromatic solvents

Гинзбург, Б. М.; Tuichiev, Sh.; Табаров, С. Х.

doi:10.1134/s1070427209030082

Cited by 12 publications

(16 citation statements)

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“…The results showed that, in all cases, the saturated fullerene solutions had a higher evaporation rate than pure solvents. These results are in excellent agreement with what Ginsburg et al have reported [37][38][39][40][41]. The unique finding of our current results is the very clear maxima and minima behavior measured.…”

Section: Discussionsupporting

confidence: 94%

“…where ܵ and ܵ are the molar entropies of liquid solvent in the solution and pure state, respectively, R is the gas constant, and ‫ݔ‬ ௦ is the mole fraction of solvent in the solution. Such xylene solutions, where three and two orders of magnitude difference have been observed in the evaporation point, respectively [39]. Hence, our current results along with previous results published in the literature raise the important question about the validity of the colligative properties theory in systems containing nanosized solutes that are well into the nanoscale regime.…”

Section: Discussionsupporting

confidence: 68%

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On the evaporation kinetics of [60] fullerene in aromatic organic solvents

Amer

Wang

Kollins

et al. 2018

Phys. Chem. Chem. Phys.

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We investigate the effect of C60 fullerene nanospheres on the evaporation kinetics of a number of aromatic solvents with different levels of molecular association, namely, benzene, toluene, and chlorobenzene. The dependence of the evaporation rate on the fullerene concentration is not monotonic but rather exhibits maxima and minima. The results strongly support the notion of molecular structuring within the liquid solvent controlled by the nature of the fullerene/solvent interaction and the level of molecular association within the solvent itself.

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Section: Discussionsupporting

confidence: 94%

Section: Discussionsupporting

confidence: 68%

On the evaporation kinetics of [60] fullerene in aromatic organic solvents

Amer

Wang

Kollins

et al. 2018

Phys. Chem. Chem. Phys.

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“…This may reflect the complicated organization of the fullerene solutions in aromatic solvents including toluene, proved by Ginzburg, Tuĭchiev, and their colleagues. − Using the X-ray diffraction patterns and ebullioscopy and a set of other thermodynamic methods, these authors found that the fullerene molecules are surrounded by shells of hundreds of aromatic solvent molecules. Probably, cooling changes in some way such giant solvation shells, and a period of time is necessary to restore the system.…”

Section: Resultsmentioning

confidence: 98%

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

Mchedlov‐Petrossyan

Marfunin

2021

Langmuir

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This paper is aimed at better understanding the nature of C70 aggregates in organic solvents. As liquid media, acetonitrile–toluene mixed solvents were chosen. At a high content of CH3CN, e.g., 90 vol %, colloidal particles with a size of ca. 225 ± 10 nm are formed with a negative ζ-potential of −(55 ± 5) mV and are stable over time. The interaction with electrolytes containing single-, double-, and triple-charged cations was examined using dynamic light scattering and UV–visible spectra. Additional experiments were carried out with methanol and benzene instead of acetonitrile and toluene, respectively. For comparison, data were obtained with C60 organosols. It was found that coagulation obeys the classical Schulze–Hardy rule. The specificity of the coagulating power of various single-charged cations was explained by their different abilities to adsorb on negatively charged C70 aggregates. The overcharging effect is expressed not only for Ca2+ and La3+ ions but even for Li+ and is caused by poor solvation of such cations in a cationophobic solvent, acetonitrile. After introduction of the cryptand [2.2.2], a substantial increase in the critical concentrations of coagulation for Na+, Li+, and Ca2+ was observed owing to conversion of “bare” metal cations into their cryptates. The application of the Derjaguin–Landau–Verwey–Overbeek theory allowed for evaluation of the Hamaker constant of the C70–C70 interaction in vacuum, A FF, which lies in the interval of 5.8–16.6 × 10–20 J. Such an estimate, close to that made previously for C60 organosols, was received after withdrawing electrolytic systems where the hetero- and mutual coagulation were highly likely. However, it is impossible to completely exclude the interfering influence of the latter phenomena. Based on the obtained A FF values, two approaches to understanding the behavior of fullerenes in water were proposed.

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“…Though fullerene solutions in such solvents as n-hexane should be considered as true ones, i.e., molecular, some examples of oversaturated solutions with C 60 colloidal species about 200 nm have been reported [22]. On the other hand, Ginzburg et al [23][24][25][26][27] disclosed unusual properties of C 60 and C 70 in aromatic solvents (benzene, toluene, xylenes) using ebullioscopy, X-ray diffraction patterns, and some other methods: the fullerene molecules are surrounded by shells of hundreds aromatic solvent molecules. This allows considering such molecular solutions as a kind of periodic colloidal systems, or colloidal crystals [10].…”

Section: State Of the Artsmentioning

confidence: 99%

Behavior of fullerene C70 in binary organic solvent mixtures as studied using UV-Vis spectra and dynamic light scattering

Marfunin

Mchedlov‐Petrossyan

2019

Chemical Series

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In this paper, the formation of colloidal species of fullerene C 70 in organic solvents was studied. The examining of the UV-visible spectra was accompanied by particle size analysis using dynamic light scattering, DLS. Stock solutions of C 70 in non-polar toluene and n-hexane were diluted with polar solvents acetonitrile and methanol. The appearance of colloidal species with a size within the range of ≈ 50-500 nm is accompanied by alterations of the absorption spectra. In the toluene-acetonitrile and toluene-methanol binary mixed solvents at 25 o C, the absorption spectra of C 70 (5×10-6 M) tend to retain the features of the spectrum in neat aromatic solvent even if the C 70 molecules are gathered into colloidal aggregates. Earlier such phenomenon was observed for C 60 in benzeneacetonitrile and toluene-methanol solvent systems. This gives support to the idea of rather stable primary solvate shells formed by aromatic molecules around the fullerene molecules. The behavior of C 70 in toluene mixtures with methanol was compared with the earlier reported results from this laboratory for the C 60 fullerene in the same solvent system. The study of n-hexane-methanol mixtures was performed at elevated temperature because of limited miscibility of these solvents at 25 o C. Accordingly, the C 70-toluene-methanol system was also examined at 40 o C. A small but distinctly noticeable difference was revealed. Whereas in the case of the last-named system, the absorption spectrum typical for molecular form of C 70 is still observable when colloidal species are already present in the solution, the turning-point between molecules and colloids as determined by both UVvisible spectra and DLS coincides for the n-hexane-methanol binary mixed solvent. Hence, the solvation shells formed by the aliphatic solvent around C 70 are less stable as compared with those formed by toluene. Finally, the absorption spectra of C 70 in the mixed solvents toluene-n-hexane were analyzed. These data give some support to the assumption of preferable solvation of the C 70 molecules by the aromatic co-solvent.

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Effect of C60 fullerene on the boiling point of its solutions in some aromatic solvents

Cited by 12 publications

References 2 publications

On the evaporation kinetics of [60] fullerene in aromatic organic solvents

On the evaporation kinetics of [60] fullerene in aromatic organic solvents

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

Behavior of fullerene C70 in binary organic solvent mixtures as studied using UV-Vis spectra and dynamic light scattering

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Effect of C60 fullerene on the boiling point of its solutions in some aromatic solvents

Cited by 12 publications

References 2 publications

On the evaporation kinetics of [60] fullerene in aromatic organic solvents

On the evaporation kinetics of [60] fullerene in aromatic organic solvents

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

Behavior of fullerene C70 in binary organic solvent mixtures as studied using UV-Vis spectra and dynamic light scattering

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