Evolution of cyclic clusters in SiO2 hollow particle shells during heat treatment

IF 2.3 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS

Journal of Sol-Gel Science and Technology Pub Date : 2025-01-10 DOI:10.1007/s10971-024-06659-4

Tatiana N. Fursova, Nadezhda S. Sukhinina, Vladimir M. Masalov, Irina I. Zverkova, Gennadi A. Emel’chenko

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Abstract

The transformation of shell structure of the core-shell particles of poly(methyl methacrylate)-silica and hollow SiO₂ particles undergoing heat treatment was studied by infrared (IR) spectroscopy using deconvolution of absorption bands in the wavenumber range 400–650 cm^–1. It was revealed that the changes in the IR absorption spectra during annealing were caused by structural transformation of the particles’ material due to its restructuring, including the formation of silica ring clusters of different sizes and changes of their ratio during annealing. The used method of the spectra deconvolution made it possible to consider in more detail the parameters and contributions of the vibration modes of such clusters to the absorption spectra of SiO₂. A modified structure of a polysiloxane, synthesized through hydrolysis of trimethoxy(vinyl)silane, which represents a polymer chain of repeating fragments containing four- and three-fold (Si–O) rings linked by a bridging oxygen atom, is proposed. It has been found that skeletal vibrations of 6-fold (Si–O) rings combined with transverse optical and longitudinal optic vibration modes of the Si–O–Si bonds make the principal contribution to total IR absorption of the studied samples both in amorphous and in crystal silica structures obtained after annealing.

Graphical Abstract

Abstract Image

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热处理过程中SiO2空心颗粒壳中循环团簇的演化

利用400 ~ 650 cm-1波段吸收反褶积红外光谱研究了热处理后聚甲基丙烯酸甲酯-二氧化硅核壳粒子和空心SiO2粒子壳结构的变化。结果表明，退火过程中红外吸收光谱的变化是由于颗粒材料的结构变化引起的，包括不同大小的硅环团簇的形成及其比例的变化。利用光谱反褶积的方法可以更详细地考虑这些团簇的振动模式对SiO2吸收光谱的参数和贡献。提出了一种由三甲氧基（乙烯基）硅烷水解合成的聚硅氧烷的改性结构，该结构代表了由桥接氧原子连接的含有四重和三重（Si-O）环的重复片段的聚合物链。研究发现，六重（Si-O）环的骨架振动与Si-O - si键的横向光学和纵向光学振动模式相结合，是研究样品在退火后获得的非晶和晶体二氧化硅结构中总红外吸收的主要贡献。图形抽象

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来源期刊

Journal of Sol-Gel Science and Technology 工程技术-材料科学：硅酸盐

CiteScore

4.70

自引率

4.00%

发文量

280

审稿时长

2.1 months

期刊介绍： The primary objective of the Journal of Sol-Gel Science and Technology (JSST), the official journal of the International Sol-Gel Society, is to provide an international forum for the dissemination of scientific, technological, and general knowledge about materials processed by chemical nanotechnologies known as the "sol-gel" process. The materials of interest include gels, gel-derived glasses, ceramics in form of nano- and micro-powders, bulk, fibres, thin films and coatings as well as more recent materials such as hybrid organic-inorganic materials and composites. Such materials exhibit a wide range of optical, electronic, magnetic, chemical, environmental, and biomedical properties and functionalities. Methods for producing sol-gel-derived materials and the industrial uses of these materials are also of great interest.