scholarly journals Effects of the Addition of Titanium Dioxide; Sodium Silicate and Silica Nanoparticles on the Elimination of Bacteria and Viruses in a Physical Field

2021 ◽  
Vol 9 (2) ◽  
pp. 24-29
Author(s):  
Hesham Mohamed Abdal-Salam Yehia ◽  
Said Mahmoud Said
Keyword(s):  
Titanium Dioxide ◽  
Silica Nanoparticles ◽  
Sodium Silicate ◽  
Physical Field

Rice Hull Micro and Nanosilica: Synthesis and Characterization

2016 ◽  
Vol 718 ◽  
pp. 77-80 ◽  
Author(s):  
Worawat Jansomboon ◽  
Khatawut Boonmaloet ◽  
Suradet Sukaros ◽  
Paweena Prapainainar
Keyword(s):  
Particle Size ◽  
Silica Nanoparticles ◽  
Sodium Silicate ◽  
Silica Particle ◽  
Precipitation Method ◽  
Rice Hull ◽  
Synthesis And Characterization ◽  
Natural Material ◽  
Silica Microparticles ◽  
Temperature Levels

Rice hull is a by-product natural material composing of high amount of silica. In this work, silica microparticles were synthesized from rice hull using 3 temperature levels of calcination at 500, 600, and 850 ºC. Then, they were transformed to silica nanoparticles by precipitation method using sodium silicate as an initial substance synthesized from rice hull. Finally, the properties of silica particle were studied such as characteristics, morphology of particle, component, and size of silica. The result showed the silica structure became more crystalline when the temperature was increased. When the concentration of sodium silicate increased, more agglutination occurred in the silica structure. The results also indicated that the particle size and component of silica synthesized by heating rice hull at 600 ºC followed by precipitation method were the same as those of commercial silica.

scholarly journals Effect of reaction time on formation of silica core/shell particles

2015 ◽  
Vol 9 (4) ◽  
pp. 209-214 ◽  
Author(s):  
Milan Nikolic ◽  
Radoslav Filipovic ◽  
Slobodanka Stanojevic-Nikolic
Keyword(s):  
Reaction Time ◽  
Mesoporous Silica ◽  
Silica Nanoparticles ◽  
Sodium Silicate ◽  
Sodium Silicate Solution ◽  
Silicate Solution ◽  
Core Shell ◽  
Silica Core ◽  
Shell Particles ◽  
Core Particles

The silica core/shell nanostructures were prepared by a wet-chemical process. Silica core particles were prepared by hydrolysis and condensation of tetraethylorthosilicate. The obtained particles (average size ~0.4 ?m) were used as templates for assembling of silica nanoparticles generated from highly basic sodium silicate solution. The silica core particles were functionalized with 3-aminopropyltriethoxysilane (APTES) to allow electrostatic assembling of silica nanoparticles on the surface of silica core particles. In order to find the optimal conditions for synthesis of silica core/shell particles with mesoporous shells, the effect of reaction time on formation of silica nanoparticles was investigated. The effect of process parameters on generation and aggregation of silica nanoparticles prepared from highly basic sodium silicate solution was also investigated. It was shown that the size of silica nanoparticles and tendency towards aggregation increase with increasing the reaction time and temperature. These behaviours were reflected on the formation of mesoporous silica shell around silica core particles. Thin and uniform mesoporous silica layers were obtained if reaction times were kept short. When the reaction time was prolonged, the thicker and non-uniform shells were obtained.

Facile Synthesis Silica Nanoparticles from Indonesia Silica Sand and their Physico-Chemical Properties

2020 ◽  
Vol 862 ◽  
pp. 35-39
Author(s):  
Agus Ismail ◽  
Ariffinisa Lintang Widyaningtyas ◽  
Bambang Heru Susanto ◽  
Mohammad Nasikin
Keyword(s):  
Silica Nanoparticles ◽  
Sodium Silicate ◽  
Sol Gel ◽  
Chemical Properties ◽  
Spherical Shape ◽  
Sodium Silicate Solution ◽  
Silicate Solution ◽  
Silica Sand ◽  
Easy Method ◽  
Simple Method

Silica nanoparticles are a very promising functional material when purified from silica sand for wide application. In addition, a low cost and easy method to obtain the material will be increasing the value of silica sand. To synthesize of nanoparticles using an easily scalable, cheap and simple method, we suggest a sodium silicate solution as a precursor that silica sand was diluted on the NaOH. After that, the sodium silicate solution under various alcohols (methanol and ethanol) in the acid medium was conducted by sol gel method to obtain silica nanoparticles. The synthesized of silica nanoparticles was observed to the non-agglomerate, homogeneous and spherical shape with an average size about 200 nm. We also noted the existence of NaNO3 by side product of reaction on the system, which may be the amorphous silica unidentified on the XRD results.

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