Hydrophobized Silicas as Functional Fillers of Fire-Extinguishing Powders

Кондрашова, Н. Б.; Shamsutdinov, Artem Sh.; Вальцифер, И. В.; Starostin, Anton; Вальцифер, В. А.

doi:10.1134/s0020168518100102

Cited by 9 publications

(4 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Note that the high PMHS concentration of 20 wt % refers solely to a porous structure. For nonporous materials, the lower the concentration of OH groups, the smaller the amount of water repellent required to obtain hydrophobic surface conditions …”

Section: Resultssupporting

confidence: 92%

“…For nonporous materials, the lower the concentration of OH groups, the smaller the amount of water repellent required to obtain hydrophobic surface conditions. 55 Mesoporous Materials as Functional Additives. Owing to their superhydrophobic properties, mesoporous SiO 2 samples can be used as the functional additives of fire and explosion suppression compositions.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

See 1 more Smart Citation

Mesoporous Hydrophobic Silica Nanoparticles as Flow-Enhancing Additives for Fire and Explosion Suppression Formulations

Saenko

Yan

Shamsutdinov

et al. 2020

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

This paper describes a fire and explosion suppression formulation with increased flowability that ensures fast operation and high efficiency of an active explosion suppression system (complete fire and explosion suppression time = 2.25 ms; spraying capacity = over 98%). For the first time, the possibility of using mesoporous materials of different structures with high specific surface area as flow additives for these formulations has been reported. This also covers the results of an experimental study on the influence of various mesoporous silica materials used as additives on the rheological characteristics of a monoammonium phosphate (MAP)-based fire and explosion suppressant. Particular attention is paid to analysis of the results of the experiments in which the mesoporous materials are protected from moisture via poly(methylhydrosiloxane) hydrophobic modification. The study of the rheology of powders indicates that the flow parameters depend on the surface characteristics of silica nanoparticles and their size and concentration. The incorporation of superhydrophobized silica into MAP leads to a decrease in the cohesion force and an increase in the flow function ff (composition contact angle > 163°). The amount of superhydrophobic silica also affects the autoadhesion forces between particles. It has been established that the minimum resistance of a fire and explosion suppression powder to the flow occurs when modified nanoparticles with SBA-15-type structure are used as additives. The efficiency of hydrophobized silica materials as additives increases greatly with a decrease in the size of their particle agglomerates. The joint use of SBA-15 and Aerosil 380 silicas makes it possible to improve the rheological properties of the fire and explosion suppression formulation and to significantly increase its flowability.

show abstract

Section: Resultssupporting

confidence: 92%

Section: ■ Results and Discussionmentioning

confidence: 99%

Mesoporous Hydrophobic Silica Nanoparticles as Flow-Enhancing Additives for Fire and Explosion Suppression Formulations

Saenko

Yan

Shamsutdinov

et al. 2020

ACS Appl. Nano Mater.

View full text Add to dashboard Cite

show abstract

“…31−34 Thus, there is no need in any procedure for agglomerate destruction, such as high-speed mechanical mixing. At the same time, it should be taken into account that as reported in refs 25,35,36, the mechanical destruction of strong agglomerates of ultradispersed additives often has an undesirable effect on the fire extinguishing: the particle size distribution is changed and can drop out of the required range.…”

Section: T H Imentioning

confidence: 96%

Manufacturing, Properties, and Application of Nanosized Superhydrophobic Spherical Silicon Dioxide Particles as a Functional Additive to Fire Extinguishing Powders

Shamsutdinov

Кондрашова

Вальцифер

et al. 2021

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

The method of manufacturing nanosized spherical superhydrophobic silica particles is reported. The efficiency of hydrophobized nanosilica (NS) as an additive to fire extinguishing powders (FEP) based on ammonium phosphates was evaluated. The effect of hydrophobization on the texture properties, size, and shape of the NS additive particles was studied. The surface of the fire extinguishing component is uniformly coated by spherical hydrophobized NS nanoparticles without a high-speed mixing procedure. NS additive provides a highly hydrophobic coating to the particles of the FEP + NS fire extinguishing powder. The apparent contact angle of the coated particles was found to be larger than 160°. The dynamic flow resistance of commercial and FEP + NS fire extinguishing powders was compared. The specific energy and aerated flow energy of the FEP + NS is relatively low, thus indicating a weak aerodynamic interaction between the particles in dynamic processes. It was established that the spraying resistance of FEP + NS is the lowest among the studied fire extinguishing powders (including commercial ones), so it is characterized by the best flowability.

show abstract

“…In our previous investigations [ 17 , 18 ], hydrophobized silicon dioxide was considered a functional additive to improve the performance properties of fire-extinguishing powder (FEP) compositions based on monoammonium phosphate (MAP). The specific efficiency improvement of fire-extinguishing powders can be achieved through the use of crystalline hydrates containing chemically bound water.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of Hydrophobic Nanosized Silicon Dioxide with a Spherical Particle Shape and Its Application in Fire-Extinguishing Powder Compositions Based on Struvite

et al. 2023

View full text Add to dashboard Cite

Textural and morphological features of hydrophobic silicon dioxide, obtained by the hydrolysis of tetraethoxysilane in an ammonia medium followed by modification of a spherical SiO2 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).

show abstract

Hydrophobized Silicas as Functional Fillers of Fire-Extinguishing Powders

Cited by 9 publications

References 6 publications

Mesoporous Hydrophobic Silica Nanoparticles as Flow-Enhancing Additives for Fire and Explosion Suppression Formulations

Mesoporous Hydrophobic Silica Nanoparticles as Flow-Enhancing Additives for Fire and Explosion Suppression Formulations

Manufacturing, Properties, and Application of Nanosized Superhydrophobic Spherical Silicon Dioxide Particles as a Functional Additive to Fire Extinguishing Powders

Synthesis of Hydrophobic Nanosized Silicon Dioxide with a Spherical Particle Shape and Its Application in Fire-Extinguishing Powder Compositions Based on Struvite

Contact Info

Product

Resources

About