Formation of BI- and Polymodal Distributions and the Non-Ostwald Behavior of Disperse Systems

Fedoseev, V. B.; Fedoseeva, E. N.

doi:10.1007/s10891-019-02033-2

Cited by 11 publications

(2 citation statements)

References 20 publications

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“…According to the obtained results, we observed the change of the aspect ratio with a decrease in the L and an increase in the W of the crystals. Thus, the non-Ostwaldian behavior of HA particles was established, as it was previously for Bi 2 WO 6 [ 70 ] and for NaCl crystals [ 71 ].…”

Section: Discussionmentioning

confidence: 86%

Effects of Various Ripening Media on the Mesoporous Structure and Morphology of Hydroxyapatite Powders

Goldberg

Антонова²,

Donskaya³

et al. 2023

Nanomaterials

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Mesoporous hydroxyapatite (HA) materials demonstrate advantages as catalysts and as support systems for catalysis, as adsorbent materials for removing contamination from soil and water, and as nanocarriers of functional agents for bone-related therapies. The present research demonstrates the possibility of the enlargement of the Brunauer–Emmett–Teller specific surface area (SSA), pore volume, and average pore diameter via changing the synthesis medium and ripening the material in the mother solution after the precipitation processes have been completed. HA powders were investigated via chemical analysis, X-ray diffraction analysis, Fourier-transform IR spectroscopy, transmission electron microscopy (TEM), and scanning (SEM) electron microscopy. Their SSA, pore volume, and pore-size distributions were determined via low-temperature nitrogen adsorption measurements, the zeta potential was established, and electron paramagnetic resonance (EPR) spectroscopy was performed. When the materials were synthesized in water–ethanol and water–acetone media, the SSA and total pore volume were 52.1 m2g−1 and 116.4 m2g−1, and 0.231 and 0.286 cm3g−1, respectively. After ripening for 21 days, the particle morphology changed, the length/width aspect ratio decreased, and looser and smaller powder agglomerates were obtained. These changes in their characteristics led to an increase in SSA for the water and water–ethanol samples, while pore volume demonstrated a multiplied increase for all samples, reaching 0.593 cm3g−1 for the water–acetone sample.

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Section: Discussionmentioning

confidence: 86%

Effects of Various Ripening Media on the Mesoporous Structure and Morphology of Hydroxyapatite Powders

Goldberg

Антонова²,

Donskaya³

et al. 2023

Nanomaterials

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“…Повышение растворимости органических и биоорганических веществ при малых объемах раствора является следствием размерных эффектов, представляющим интерес для органического синтеза, фармацевтики. Для спрей-технологий важным следствием описанных эффектов являются закономерности формирования устойчивых бимодальных распределений капель по размерам [24].…”

Section: термодинамическая интерпретация и обсуждение результатовunclassified

Неоствальдовское Поведение Дисперсных Систем В Процессах Испарения И Кристаллизации Капель Водно-Органических Растворов

Федосеева¹,

Федосеев²

2020

Журнал Технической Физики

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In this paper, experiments with water-based solutions of some organic compounds, which demonstrate non-Ostwald behavior have been described. Small-volume droplets demonstrate higher stability during evaporation and crystallization in comparison with larger ones, such an effect has been previously described only for water-based solutions of inorganic salts. It has been shown that non-Ostwald behavior has the same thermodynamic nature with Ostwald ripening and could occur in dispersed systems of a complicated chemical composition. Peculiar realization of such phenomena driven by surface activity of organic compounds in water solutions has also been described. The studied regularities could be used to obtain solutions of organic and bioorganic substances with concentrations significantly higher than their solubility limits under normal conditions as well as to reproduce narrow size distributions of droplets in various spray technologies.

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Thermal Stability and Phase Composition of Stratifying Polymer Solutions in Small-Volume Droplets

Shishulin

Fedoseev

2020

J Eng Phys Thermophy

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Formation of BI- and Polymodal Distributions and the Non-Ostwald Behavior of Disperse Systems

Cited by 11 publications

References 20 publications

Effects of Various Ripening Media on the Mesoporous Structure and Morphology of Hydroxyapatite Powders

Effects of Various Ripening Media on the Mesoporous Structure and Morphology of Hydroxyapatite Powders

Неоствальдовское Поведение Дисперсных Систем В Процессах Испарения И Кристаллизации Капель Водно-Органических Растворов

Thermal Stability and Phase Composition of Stratifying Polymer Solutions in Small-Volume Droplets

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