Thermodynamic manipulation of the particle size in the synthesis of spherical silica from a new aspect of interface wettability

IF 5.7 2区 材料科学 Q2 CHEMISTRY, PHYSICAL
Qingwen Liang , Yaxi Liu , Xiaofei Zhu , Ning Wang
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Abstract

In the stöber synthesis of spherical silica, the alcohol/water ratio is normally regarded as the major factor that determines the final particle size of the products, but a solid relationship between the alcohol/water ratio and the particle size is hard to be deduced, and the thermodynamic mechanism behind this phenomenon has not been fully discussed yet. In this paper, the methanol/ethanol/isopropanol-H2O solvents with different alcohol/water ratio are used to prepare spherical silica particles via a classic stöber synthesis. It is found that not only the surface tension of the reaction system, but also the interface contact angle can effectively influence the final particle size of the silica products, and an interfacial wetting effect could be deduced for the thermodynamic analysis of this phenomenon. In this interfacial wetting mode for the particle size manipulation, the particle size is proportional to the surface tension of the reaction system when the interface contact angle is below 90⁰, but an inverse proportional relationship will be applicable when the interface contact angle is above 90⁰. Assisted with this new mechanism, the iso-particle size contour curves based on pairs of surface tension and the interface contact angle could be deduced, and the controllable stöber synthesis of spherical silica particles could be reached in a more facile and accurate way.

Abstract Image

从界面润湿性的新角度看球形二氧化硅合成过程中粒度的热力学控制
在球形二氧化硅的斯托伯合成中,醇水比通常被认为是决定产物最终粒度的主要因素,但醇水比与粒度之间的稳固关系却很难推导出来,这一现象背后的热力学机制也尚未得到充分讨论。本文采用不同醇水比的甲醇/乙醇/异丙醇-H2O 溶剂,通过经典的斯托伯合成法制备球形二氧化硅颗粒。研究发现,不仅反应体系的表面张力,界面接触角也能有效影响二氧化硅产物的最终粒度,并推导出界面润湿效应,从而对这一现象进行热力学分析。在这种界面润湿模式的粒度控制中,当界面接触角低于 90⁰时,粒度与反应体系的表面张力成正比,而当界面接触角高于 90⁰时,则呈反比例关系。在这一新机理的帮助下,可以推导出基于表面张力和界面接触角的等粒度等值线图,从而更简便、更准确地实现球形二氧化硅颗粒的可控合成。
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来源期刊
Surfaces and Interfaces
Surfaces and Interfaces Chemistry-General Chemistry
CiteScore
8.50
自引率
6.50%
发文量
753
审稿时长
35 days
期刊介绍: The aim of the journal is to provide a respectful outlet for ''sound science'' papers in all research areas on surfaces and interfaces. We define sound science papers as papers that describe new and well-executed research, but that do not necessarily provide brand new insights or are merely a description of research results. Surfaces and Interfaces publishes research papers in all fields of surface science which may not always find the right home on first submission to our Elsevier sister journals (Applied Surface, Surface and Coatings Technology, Thin Solid Films)
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