The nanoheterogeneous structure of aqueous solutions of n-propanol

Byakov, V. M.; Lanshina, L. V.; Stepanova, O. P.; Stepanov, S. V.

doi:10.1134/s0036024409020125

Cited by 17 publications

(11 citation statements)

References 8 publications

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“…At low concentrations, differs from ( ) by the small quantity Δ , for which we obtain the following equation from Eqs. (11) and (12):…”

Section: Refraction Of Light In Water-alcohol Solutionsmentioning

confidence: 99%

“…A solution with such a distribution of molecules has the entropy minimum, which stimulates its transition into the microinhomogeneous state. In other words, in the solution with the homogeneous distribution of water and alcohol molecules, there appear microregions with a slightly different type of the local structure or droplets of a metastable phase [11]. Their existence allows the results of experiments [8][9][10] and computer calculations [12] to be explained in a natural way.…”

Section: Introductionmentioning

confidence: 99%

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Refractometry of Water–Ethanol Solutions near Their Contraction Point

Bulavin¹,

Gotsulskiy²,

Malomuzh³

et al. 2015

Ukr. J. Phys.

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The concentration dependences of the refractive index in aqueous ethanol solutions at equilibrium have been studied experimentally. Special attention was paid to their behavior in a vicinity of the peculiar point defined as the intersection point of the concentration dependences of the contraction measured at different temperatures or as a point, at which the intensity of molecular light scattering has a maximum. The refractive index is found to noticeably deviate from its reference values in a vicinity of the peculiar point, 0.05 < < 0.1 (is the mole fraction of ethanol). This effect reflects the fact that the equilibrium properties of the solutions concerned are established only during a few weeks. Arguments that the system becomes microinhomogeneous in this concentration interval are presented. K e y w o r d s: water-alcohol solutions, refractive index, microinhomogeneous structure.

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“…At low concentrations, differs from ( ) by the small quantity Δ , for which we obtain the following equation from Eqs. (11) and (12):…”

Section: Refraction Of Light In Water-alcohol Solutionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Refractometry of Water–Ethanol Solutions near Their Contraction Point

Bulavin¹,

Gotsulskiy²,

Malomuzh³

et al. 2015

Ukr. J. Phys.

View full text Add to dashboard Cite

show abstract

“…This difference manifests itself in such physical properties as the intensity of molecular light scattering in a vicinity of the singular point of the solution [4][5][6], adiabatic compressibility [7], and heat capacity [8], in the emergence of anomalously large relaxation times [3,9], and even in the behavior of the simplest thermodynamic parameter of the system, its contraction (a decrease in the volume at the solution formation) [10][11][12][13][14]. From the standpoint of the theory of molecular structure, all those and other peculiarities in the behavior of solutions [15] are a result of clustering processes running in them.…”

Section: Introductionmentioning

confidence: 99%

“…As was shown in works [3,14], the uniform distribution of water molecules over the monolayers is thermodynamically unstable. Therefore, concentration fluctuations grow at the singular point, and there emerges a microscopically heterogeneous structure of the solution [4,14,15,19,20].…”

Section: Introductionmentioning

confidence: 99%

Qualitative Analysis of Clustering in Aqueous Alcohol Solutions. II

Chechko¹,

Gotsulskiy

Diieva

2019

Ukr. J. Phys.

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Specific features of the clustering in aqueous solutions of monoatomic alcohols have been discussed. Main attention is focused on details of the clustering in water-ethanol solutions. The clustering degree is supposed to depend on the nteraction between ethanol and water molecules, as well as on the ordering degree of the H-bond network in water, which changes with the temperature and concentration of the alcohol. The elementary cluster volume is assumed to be smaller than the sum of the molecular volumes of components that form this cluster. The clustering degree in aqueous solutions of methanol and ethanol and its concentration and temperature dependences are determined.

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“…[1][2][3][4][5][6][7] Although in recent decades many authors have found sharp transitions in some thermodynamic properties, revealing those changes in aggregation schemes during the mixing process, a molecular understanding based on these transitions remains an enigma. It has been proved that different types of aggregation patterns are formed over the entire composition range making the knowledge of their properties very important, both from theoretical and practical points of view.…”

Section: Introductionmentioning

confidence: 99%

Revealing microheterogeneities and second order phase transitions in aqueous mixtures of 1-propoxypropan-2-ol at 298 K

Lampreia

Santos

Borges

et al. 2016

Phys. Chem. Chem. Phys.

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Second order phase transitions corresponding to discontinuities in the plots of Kirkwood-Buff integrals as a function of composition were observed in aqueous mixtures of the amphiphilic molecule, 1-propoxypropan-2-ol, revealing the formation of hydrophobic aggregates and generating microheterogeneities over a limited range of compositions. Electrospray mass spectra, surface tension measurements and solvatochromic parameters confirmed the onsets of different aggregation patterns over the entire composition range, and allowed us to scrutinize the prevailing types of aggregate species. This is seemingly the first time that such discontinuities are clearly assumed as second order phase transitions in a system macroscopically homogeneous and corroborated by other independent tools.

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The nanoheterogeneous structure of aqueous solutions of n-propanol

Cited by 17 publications

References 8 publications

Refractometry of Water–Ethanol Solutions near Their Contraction Point

Refractometry of Water–Ethanol Solutions near Their Contraction Point

Qualitative Analysis of Clustering in Aqueous Alcohol Solutions. II

Revealing microheterogeneities and second order phase transitions in aqueous mixtures of 1-propoxypropan-2-ol at 298 K

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