Features of self-aggregation of C 60 molecules in toluene prepared by different methods

Makhmanov, U. K.; Ismailova, O. B.; Kokhkharov, A. M.; Zakhidov, E. A.; Bakhramov, S. A.

doi:10.1016/j.physleta.2016.04.030

Cited by 27 publications

(23 citation statements)

References 34 publications

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“…This broad band was attributed to multiple vibronic excitations activated through an HT coupling orbital to the JT distorted orbital at a higher level, assigned as forbidden singlet-singlet transitions [26]. This experimental absorption feature was in agreement with the pioneering works that reported the absorption spectra of C 60 in toluene [68,69], o-xylene [25], n-hexane [26,[70][71][72], and N-methyl-pyrrolidine (NMP) [73].…”

Section: Resultssupporting

confidence: 86%

The Study of the Optical Properties of C60 Fullerene in Different Organic Solvents

et al. 2019

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C 60 fullerene exhibits unique optical properties that have high potential for wide photooptical applications. To analyze the optical properties of C 60 , its excitation and emission properties were studied using UV-Vis absorption and photoluminescence (PL) spectroscopy, which were performed in various, nonpolar organic solvents such as toluene, xylene, and trichloroethylene (TCE). The C 60 solutions in toluene, xylene, and TCE displayed similar excitation bands at 625, 591, 570, 535, and 404 nm corresponding to A g → T 1u and A g → T 1g transitions. However, these bands differed from the solid C 60 observed by UV-Vis diffuse reflectance spectroscopy. The two emission band energies of C 60 solution in toluene and xylene were nearly the same (1.78 and 1.69 eV), whereas the C 60 solution in TCE was shifted to 1.72 and 1.65 eV. Because the polarity of TCE is higher than that of toluene and xylene, the PL spectrum of the C 60 solution in TCE was red-shifted. The PL spectroscopy had a better capability than UV-Vis absorbance spectroscopy to distinguish the different interactions between C 60 and the organic solvents due to their different solvent polarities.

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Section: Resultssupporting

confidence: 86%

The Study of the Optical Properties of C60 Fullerene in Different Organic Solvents

et al. 2019

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“…The self-aggregation of C 60 molecules and the formation of nanostructured porous frac-tal aggregates in the initial solution of fullerene (with a solvent concentration of ~0.468 mol/m 3 ), in our opinion, will occur according to the following mechanism. It is known [45,46,48] that the minimum free energy of the C 60 /'low polar solvent' system can only be achieved by forming the initial stable aggregate with a diameter of ~4.6 nm containing 55 molecules of C 60 .…”

Section: Resultsmentioning

confidence: 99%

“…Under similarity conditions of the aggregation of C 60 particles, the fractal dimension of mC 60 nanoaggregate may be represented by the formula [46] , ln -ln…”

Section: Resultsmentioning

confidence: 99%

“…The obtained DLS results show that the used C 60 solutions belong to the dispersed colloidal system and the synthesis of mC 60 nanoaggregates in xylene/THF mixtures occurs almost immediately after the preparation of the solution. During the self-assembly of fullerene molecules in a nonequilibrium solution, C 60 molecules form a nanostructure, finding the most advantageous combination of interactions between molecules with minimal free energy [45,46]. In this process, a higher initial solute concentration in the solution leads to a greater number of iterations (repetitions) of the self-assembly of C 60 molecules.…”

Section: Samples and Techniquesmentioning

confidence: 99%

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The formation of self-assembled structures of C₆₀ in solution and in the volume of an evaporating drop of a colloidal solution

Makhmanov¹,

Kokhkharov²,

Bakhramov³

et al. 2020

Lith. J. Phys.

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The results of experiments on the self-aggregation of C60 fullerene molecules both inside a two-component solvent (xylene/tetrahydrofuran) and in the volume of an evaporating drop of C60 colloidal solution on a flat substrate surface are presented. The investigations of C60 solutions using dynamic light scattering, transmission electron microscopy and UV–Vis absorption spectroscopy methods revealed the possibility of synthesis of fractal nanoaggregates with a diameter of up to ~135 nm at low concentrations of C60 in the solutions. The final geometric dimensions of C60 nanoaggregates were determined by the initial concentration of fullerene in the solvent medium. Using the scanning electron microscopy method, we have shown that in an open dissipative system – in the volume of an evaporating droplet of the colloidal solution of fullerene C60 sessile on the surface of a flat glass substrate, large quasispherical nanoaggregates with an average diameter of ~380–800 nm are formed. The physical features and regularities that characterize the processes of self-aggregation of fullerene particles in the volume of a drying drop were determined.

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“…Так, нещодавно було показано, що структура i властивостi водної систе-ми, яка отримана при використаннi одного методу синтезу, залежать вiд вибору первинного органi-чного розчинника [10]. З iншого боку, спостережу-вана агрегацiя у неполярних розчинниках [11,12], якi вiдрiзняються високою розчиннiстю фулерену [13], ставлять додатковi питання про причини кла-стероутворення фулеренiв у рiзних рiдинних си-стемах. Ранiше передбачалось, що агрегацiя фуле-ренiв виникає при певнiй полярностi розчинника.…”

Section: вступunclassified

Fullerene Clustering in C70/N-Methyl-2-Pyrrolidone/Toluene Liquid System

et al. 2018

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Features of self-aggregation of C 60 molecules in toluene prepared by different methods

Cited by 27 publications

References 34 publications

The Study of the Optical Properties of C60 Fullerene in Different Organic Solvents

The Study of the Optical Properties of C60 Fullerene in Different Organic Solvents

The formation of self-assembled structures of C₆₀ in solution and in the volume of an evaporating drop of a colloidal solution

Fullerene Clustering in C70/N-Methyl-2-Pyrrolidone/Toluene Liquid System

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Features of self-aggregation of C 60 molecules in toluene prepared by different methods

Cited by 27 publications

References 34 publications

The Study of the Optical Properties of C60 Fullerene in Different Organic Solvents

The Study of the Optical Properties of C60 Fullerene in Different Organic Solvents

The formation of self-assembled structures of C60 in solution and in the volume of an evaporating drop of a colloidal solution

Fullerene Clustering in C70/N-Methyl-2-Pyrrolidone/Toluene Liquid System

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The formation of self-assembled structures of C₆₀ in solution and in the volume of an evaporating drop of a colloidal solution