Valtsifer Igor V, Huo Yan, Zamashchikov Valery V, Shamsutdinov Artem Sh, Kondrashova Natalia B, Sivtseva Anastasia V, Pyankova Anna V, Valtsifer Viktor A
Institute of Technical Chemistry, Ural Branch, Russian Academy of Sciences-Perm Federal Research Center, Russian Academy of Sciences, 614013 Perm, Russia.
College of Aerospace and Civil Engineering, Harbin Engineering University, Harbin 150001, China.
Nanomaterials (Basel). 2023 Mar 27;13(7):1186. doi: 10.3390/nano13071186.
Textural and morphological features of hydrophobic silicon dioxide, obtained by the hydrolysis of tetraethoxysilane in an ammonia medium followed by modification of a spherical SiO particles surface with a hydrophobic polymethylhydrosiloxane, were studied in this work. The size of silicon dioxide particles was controlled during preparation based on the Stöber process by variation of the amount of water (mol) in relation to other components. The ratio of components, synthesis time and amount of the hydrophobizing agent were determined to obtain superhydrophobic monodisperse silicon dioxide with a spherical particle size of 50-400 nm and a contact angle of more than 150°. In the case of the struvite example, it was demonstrated that the application of spherical- shaped hydrophobic silicon dioxide particles in powder compounds significantly improves the flowability of crystalline hydrates. The functional additive based on the developed silicon dioxide particles makes it possible to implement the use of crystalline hydrates in fire-extinguishing powders, preventing agglomeration and caking processes. The high fire-extinguishing efficiency of the powder composition based on struvite and the developed functional additive has been proven by using thermal analysis methods (TGA/DSC).
本文研究了通过在氨介质中水解四乙氧基硅烷，然后用疏水性聚甲基氢硅氧烷对球形SiO颗粒表面进行改性而获得的疏水性二氧化硅的纹理和形态特征。在基于施托伯法的制备过程中，通过改变水（摩尔）相对于其他组分的量来控制二氧化硅颗粒的尺寸。确定了组分比例、合成时间和疏水剂用量，以获得粒径为50-400nm、接触角大于150°的超疏水单分散二氧化硅。以鸟粪石为例，结果表明，在粉末化合物中应用球形疏水性二氧化硅颗粒可显著提高结晶水合物的流动性。基于所开发的二氧化硅颗粒的功能添加剂使得在灭火粉末中使用结晶水合物成为可能，可防止团聚和结块过程。通过热分析方法（TGA/DSC）已证明基于鸟粪石和所开发的功能添加剂的粉末组合物具有高灭火效率。
