Concentration-dependent variations in the density of C60 fullerene solutions in aromatic solvents

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

doi:10.1134/s1063785007080044

Cited by 13 publications

(10 citation statements)

References 2 publications

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“…With a further decrease in temperature, the glassy s of the refractive index corresregions with two exes of the refractive index of the system . The minimum points on the dependenciesn D (w) have its confirmation with the previously obtained data for other systems [13][14][15][16][17][18][19][20].…”

Section: In the Authors' Opinion Its Presence Is Explained By The App...supporting

confidence: 88%

Effect of fullerene C60 admixture in paraffin wax on the refractive index and phase transition temperatures

Hlek¹,

Ivchenko²,

Khliyeva³

et al. 2022

ФАС

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The paraffin wax (PW) utilized as a phase change material is promising for thermal energy storage systems. However, the application of this material is limited by itslow thermal conductivity. The fullerene C60 adding in PW can help to eliminate this problem.Therefore, the system PW/C60 is promising for studying its properties. The results of an experimental study of the refractive index of solutions of fullerene C60 in PW of 52...54 °C melting point at the ranges of С60content of 0...0.052 wt. %and temperatures of 41…65 °С are presented in the study. The complex character of the concentration dependence of the refractive index on isotherms for the studied thermodynamic systems has been registeredboth in liquid and solid phases.Data on the effect of the C60 content in PW on the temperatures of the start and finish of its phase transition is presented. At C60 content in PW of 0…0.01 wt. % the temperatures of the start and finish of the phase transition decreased, at C60 content of 0.01…0.04 wt. % they increased more than the pure PW temperatures and at C60 content more than 0.04 wt. % they decreased again. The obtained effects of a decrease and increase in the refractive index on the isotherms and temperatures of start and finish of PWcrystallizationcan be explained by structural transformations in PW caused by C60 presence. In the authors' opinion, the reason for the extreme behavior of concentration dependence of the refractive index of objects of study is the effect of C60 on the density fluctuations and the quasi-crystalline structure of the liquid and solid phases.These structural transformations in PW cause a similar change inthe concentration dependencies of the temperatures of the start and finish of the phase transition of objects of study.

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Section: In the Authors' Opinion Its Presence Is Explained By The App...supporting

confidence: 88%

Effect of fullerene C60 admixture in paraffin wax on the refractive index and phase transition temperatures

Hlek¹,

Ivchenko²,

Khliyeva³

et al. 2022

ФАС

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“…More recently, C 60 /water solutions were shown to play crucial role in therapeutic applications ranging from a potent broad-spectrum antibacterial activity , to acting as an inhibitor of human immunodeficiency virus (HIV). , Also, C 60 /water solutions were shown to be cytotoxic, bearing potential success for cancer treatment. , To this end, it is clear that the expanded interest in fullerene nanoparticles necessitates investigating the effect of fullerenes on solvent thermodynamic behavior. This subject has been less investigated − and is still far less understood. In the present paper, we investigate the effect of C 60 concentration on the evaporation kinetics and thermal transitions of water in C 60 /water solutions.…”

Section: Introductionmentioning

confidence: 99%

Effect of Fullerene Nanospheres on Water Evaporation Kinetics and First-Order Thermal Transitions

Amer

Wang

2012

J. Phys. Chem. C

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We investigate the evaporation kinetics and first-order thermodynamic transitions of C 60 /water solutions and find that the fullerene nanospheres cause a reduction in the evaporation rate, an increase in the evaporation point, and a slight increase in the freezing point of the system. The changes were found to be linearly dependent on the fullerene concentration in the solution, and the calculated change in entropy of evaporation indicates that fullerene molecules noticeably induce ordering in the water molecular structure. The results are discussed in light of findings from recent molecular simulation investigations.

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“…This also cannot be explained by fluctuations in the density of the fullerene solution in toluene, observed in [10] and capable of leading to changes in the fullerene concentration in the solvent mixture due to formation of lower density shells (thickness ~1.0 nm) around the fullerene molecules. In the latter case, according to our calculations, the relative change in the C 70 concentration in the mixture of toluene and acetonitrile can be no more than 2%.…”

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confidence: 81%

“…Study of the behavior of fullerenes in solutions indicates that they have unusual physical properties. The characteristic features of the optical properties of fullerenes in solutions are exhibited in the change in the shape and position of the absorption, fluorescence, and also Raman spectra for a slight change in the solvent composition and the fullerene concentration in solution [7,8], in the nonlinear concentration dependence of the nonlinear third-order susceptibility [9], in the nonmonotonic change in the optical density of the solutions as the fullerene concentration increases in aromatic solvents [10], etc. The unusual behavior of the optical and nonlinear optical properties of fullerene solutions and the solvatochromism are most often connected with the ability of fullerene molecules and their modified derivatives to self-organize into aggregates (clusters).…”

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confidence: 99%

Photoinduced optical activity of C70 fullerene in organic solvents

et al. 2009

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UDC 535.21:547We have experimentally studied for the first time the effect of photoinduced rotation of the plane of polarization for pulsed laser radiation in solutions of C 70 fullerene in organic solvents and their mixtures. We have shown that the effect is observed for elliptical polarization of the laser radiation and is absent for linear polarization. We present the results of a study of the nonlinear optical characteristics of the C 70 solutions. We discuss the physical mechanisms by which nonlinear gyrotropy is induced in solutions.Introduction. Study of the optical and nonlinear optical properties of nanocarbon materials, in particular fullerenes and carbon nanotubes of various modifications, is of significant interest in connection with the possibility of their practical use in designing the next generation of fast optical and nonlinear optical devices. A number of publications (see, for example, [1][2][3][4][5]) have reported the use of solutions of C n fullerenes (n = 60, 70, 76, 84) and fullerenecontaining films as nonlinear optical limiters for laser radiation. In [6], Q-switched and self-mode-locked conditions were realized in a pulsed Er 3+ glass laser (λ = 1.54 μm) using a passive gate based on solutions of single-walled carb-

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Concentration-dependent variations in the density of C60 fullerene solutions in aromatic solvents

Cited by 13 publications

References 2 publications

Effect of fullerene C60 admixture in paraffin wax on the refractive index and phase transition temperatures

Effect of fullerene C60 admixture in paraffin wax on the refractive index and phase transition temperatures

Effect of Fullerene Nanospheres on Water Evaporation Kinetics and First-Order Thermal Transitions

Photoinduced optical activity of C70 fullerene in organic solvents

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