Effects of solution composition and operational conditions on the characteristics of particles via oiling-out

IF 5.2 2区化学 Q2 CHEMISTRY, PHYSICAL

Journal of Molecular Liquids Pub Date : 2025-09-23 DOI:10.1016/j.molliq.2025.128603

Shuntaro Amari, Naoki Hayashi, Hikaru Itakura, Hiroshi Takiyama

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引用次数: 0

Abstract

In crystallization processes where particles precipitate from a liquid phase, the occurrence of oiling-out often hinders precise control over crystallization and particle characteristics. However, when oiling-out occurs, it can form a solution composition with an exceptionally high concentration driving force. This study explored the utilization of oiling-out, which is typically considered undesirable, aiming at the production of crystalline particles with unconventional characteristics. Specifically, the effect of the unique solution composition formed by oiling-out and multiple operational conditions such as rotation speed and temperature when the oiling-out occurs on the characteristics of crystalline particles was investigated.

The experimental results show that the particle size and agglomeration behavior were strongly affected by the solution composition. Evaluation using local concentration driving force (ΔC_Local) revealed that the high ΔC_Local generated by oiling-out leads to the precipitation of fine primary particles. Furthermore, secondary particle size increased as ΔC_Local increased. Consequently, it was suggested that the agglomeration degree of crystalline particles can be controlled by the ΔC_Local.

Additionally, this study experimentally demonstrated that both particle sizes and agglomeration behavior could also be changed by operational conditions. In particular, it was found that the sizes of both primary and secondary particles could be varied by approximately two by adjusting the rotation speed and temperature under the solution composition formed by oiling-out. These findings provide fundamental insights into the utilization of oiling-out as a method for obtaining crystalline particles with unconventional characteristics.

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溶液组成和操作条件对脱油颗粒特性的影响

在结晶过程中，颗粒从液相析出，出油现象的发生常常妨碍对结晶和颗粒特性的精确控制。然而，当发生出油时，它可以形成具有极高浓度驱动力的溶液组成。本研究探索了通常被认为不受欢迎的除油方法的利用，旨在生产具有非常规特征的结晶颗粒。具体而言，研究了出油形成的独特溶液组成以及出油时的转速和温度等多种操作条件对结晶颗粒特性的影响。实验结果表明，溶液组成对颗粒大小和团聚行为有较大影响。利用局部浓度驱动力（ΔCLocal）进行评价，发现出油产生的高ΔCLocal导致细原生颗粒的析出。二次粒径随着ΔCLocal的增大而增大。因此，可以通过ΔCLocal控制结晶颗粒的团聚程度。此外，本研究还通过实验证明了操作条件也可以改变颗粒大小和团聚行为。特别地，发现在出油形成的溶液组成下，通过调节转速和温度，初级颗粒和次级颗粒的大小都可以发生大约2的变化。这些发现为利用除油法获得具有非常规特征的晶体颗粒提供了基本的见解。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Journal of Molecular Liquids 化学-物理：原子、分子和化学物理

CiteScore

10.30

自引率

16.70%

发文量

2597

审稿时长

78 days

期刊介绍： The journal includes papers in the following areas: – Simple organic liquids and mixtures – Ionic liquids – Surfactant solutions (including micelles and vesicles) and liquid interfaces – Colloidal solutions and nanoparticles – Thermotropic and lyotropic liquid crystals – Ferrofluids – Water, aqueous solutions and other hydrogen-bonded liquids – Lubricants, polymer solutions and melts – Molten metals and salts – Phase transitions and critical phenomena in liquids and confined fluids – Self assembly in complex liquids.– Biomolecules in solution The emphasis is on the molecular (or microscopic) understanding of particular liquids or liquid systems, especially concerning structure, dynamics and intermolecular forces. The experimental techniques used may include: – Conventional spectroscopy (mid-IR and far-IR, Raman, NMR, etc.) – Non-linear optics and time resolved spectroscopy (psec, fsec, asec, ISRS, etc.) – Light scattering (Rayleigh, Brillouin, PCS, etc.) – Dielectric relaxation – X-ray and neutron scattering and diffraction. Experimental studies, computer simulations (MD or MC) and analytical theory will be considered for publication; papers just reporting experimental results that do not contribute to the understanding of the fundamentals of molecular and ionic liquids will not be accepted. Only papers of a non-routine nature and advancing the field will be considered for publication.