Hydrosol of C70 Fullerene: Synthesis and Stability  in Electrolytic Solutions

Mchedlov‐Petrossyan, Nikolay O.; Marfunin, Mykyta O.; Klochkov, Vladimir K.; Radionov, Petro

doi:10.33609/2708-129x.87.10.2021.63-73

Cited by 3 publications

(6 citation statements)

References 29 publications

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“…The coagulation studies are exemplified in Figure . The diameter increase rates (DIR) of the colloidal species were determined as described previously. , The CCC corresponds to the intersection of two lines. On reaching the conditions of rapid coagulation in DMSO, the colloidal particles increase during 15 min up to 150–200 nm, depending on the nature of cations, whereas in DMFup to 300 nm.…”

Section: Resultsmentioning

confidence: 99%

“… a The uncertainty of the CCC values is 15–20% for CCCs ≥70 mM; 20–25% for CCC from 1 to 70 mM; and up to 35% for lower CCC. b The CCC(NaCl) value is dependent on the hydrosol concentration; at C 70 concentrations of 3.3 × 10 –6 , 1.7 × 10 –5 , and 6.9 × 10 –5 M, CCC = 250, 145, and 130 mM, respectively; this hydrosol of son/nC 70 type was prepared by Klochkov c 150 mM in ref . d Average of 19 values reported by different authors …”

Section: Resultsmentioning

confidence: 99%

“… b The CCC(NaCl) value is dependent on the hydrosol concentration; at C 70 concentrations of 3.3 × 10 –6 , 1.7 × 10 –5 , and 6.9 × 10 –5 M, CCC = 250, 145, and 130 mM, respectively; this hydrosol of son/nC 70 type was prepared by Klochkov …”

Section: Resultsmentioning

confidence: 99%

“…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. Therefore, it seems natural to expand the range of solvents under study.…”

Section: Introductionmentioning

confidence: 96%

“…In the terms proposed by Churaev and Derjaguin, it is the so-called structural effect . In addition to the previous consideration of fullerenes in solution, a new review of fullerene hydrosols and aqueous suspensions was published and supplemented with an experimental study of colloidal stability of a C 70 hydrosol …”

Section: Introductionmentioning

confidence: 99%

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Unexpected Colloidal Stability of Fullerenes in Dimethyl Sulfoxide and Related Systems

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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: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 96%

Section: Introductionmentioning

confidence: 99%

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Unexpected Colloidal Stability of Fullerenes in Dimethyl Sulfoxide and Related Systems

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Stability of Detonation Nanodiamond Colloid with Respect to Inorganic Electrolytes and Anionic Surfactants and Solvation of the Particles Surface in DMSO–H2O Organo-Hydrosols

Mchedlov‐Petrossyan

Kriklya²,

Laguta³

et al. 2022

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In this article, the stability of sols of detonated nanodiamonds, DND, with positively charged colloidal particles, is studied in different salt solutions in water–dimethyl sulfoxide (DMSO) binary systems containing 95 vol.% organic solvent. Additionally, several CCC values are determined in 95 vol.% acetonitrile for comparison. The critical coagulation concentrations (CCC) are determined using the dynamic light scattering technique and the Fuchs function. As coagulators, NaCl, NaBr, NaNO3, NaClO4, Nan-C8H17SO3, and Nan-C12H25OSO3 are used. Comparison of the CCC values in DMSO–H2O and CH3CN–H2O with those obtained in water allows us to make some conclusions. The variations of these values in different solvents are explained in terms of good and poor interfacial solvation of colloidal particles, “structural” contribution to the interparticle interaction energy, lyotropic series for anions, and more or less pronounced adsorption of surfactants. The study of the stability of DND hydrosol in solutions of anionic surfactants with different hydrocarbon tail length demonstrated the crucial role of adsorption in the coagulation process.

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Colloid Chemistry of Fullerene Solutions: Aggregation and Coagulation

Mchedlov-Petrossyan,

Marfunin,

Kriklya

2023

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This review article is devoted to the colloidal properties of fullerene solutions. According to generally accepted understandings, all solvents in relations to fullerenes are divided into “good”, “poor”, and “reactive”. We have consistently considered the state of fullerenes in these systems. In “good”, predominantly non-polar aromatic solvents and CS2, non-equilibrium dissolution methods lead to the formation of colloidal aggregates, whereas the utilization of equilibrium methods results in the formation of molecular solutions. The latter, however, have some unusual properties; new results considered in this review confirm previously expressed ideas about colloidal properties of these solutions. In “poor” (polar) solvents, lyophobic colloidal systems appear. Both “bottom-up” and “top-down” methods of preparation are well documented in the literature. However, N-methylpyrrolidine-2-one, DMSO, and DMF dissolve fullerenes quite easily and with less energy consumption. These solvents can be considered a subset of “poor” solvents that have some features of being “reactive” at the expense of basic properties. New data confirm that hydrosols of fullerenes are typical hydrophobic colloids that obey the Schulze–Hardy rule and other regularities in the presence of electrolytes. Organosols in acetonitrile and methanol are much less stable with respect to the effects of electrolytes. This allows us to assume a non-DLVO stabilizing factor in the hydrosols. Accordingly, a new estimate of the Hamaker constant of fullerene–fullerene interaction is proposed. In DMSO and DMF, the coagulation of fullerene sols is hindered due to strong solvation with these basic solvents.

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Hydrosol of C70 Fullerene: Synthesis and Stability in Electrolytic Solutions

Cited by 3 publications

References 29 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 Detonation Nanodiamond Colloid with Respect to Inorganic Electrolytes and Anionic Surfactants and Solvation of the Particles Surface in DMSO–H2O Organo-Hydrosols

Colloid Chemistry of Fullerene Solutions: Aggregation and Coagulation

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