High density silanization of nano-silica particles using γ-aminopropyltriethoxysilane (APTES)

Qiao, Bing; Wang, Ting-Jie; Gao, Han; Ye, Jin

doi:10.1016/j.apsusc.2015.05.174

Cited by 162 publications

(91 citation statements)

References 39 publications

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“…Utilization of 3-glycidyloxypropyltrimethoxy silane for the modification resulted in a deposition exceeding 15 % of the treated silica mass. This is an exceptional result in comparison to the state of the art presented in literature, in which the deposition usually does not exceed 10 % [16], unless there is a complex, multi-step procedure involved allowing higher deposition rates [17].…”

Section: Resultsmentioning

confidence: 76%

Surface Modification of Fumed Silica by Dry Silanization for PP-based Dielectric Nanocomposites

Mahtabani

Rytöluoto

et al. 2019

2019 2nd International Conference on Electrical Materials and Power Equipment (ICEMPE)

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Novel nanocomposites for dielectric applications based on a polypropylene (PP) blend filled with nanosilica are developed in the frame of the European 'GRIDABLE' project. A systematic study of the influence of surface modification of the nanosilica on the dielectric properties of the PP/silica blend was performed. The main goal of this investigation was to modify the chemical composition of the silica surface, which is expected to improve the charge trapping properties of the nanocomposites. For the modification of the silica surface, a "green" approach was utilized: a dry silanization method, which is performed without the need of a solvent. Eight different silanes were investigated in this study, which are categorized into three different groups: I) Aliphatic silanes with a different number of alkoxy groups II) Hydrocarbon silanes containing delocalized electron clouds III) Polar silanes containing hetero elements (nitrogen, sulfur or oxygen) The results of the thermogravimetric analysis (TGA) show higher weight loss of the modified silicas in comparison to the unmodified one. This indicates that the dry process is an effective method to perform silica surface modification using alkoxysilanes. The charge trapping properties were studied by Thermally Stimulated Depolarization Current (TSDC) measurements. The obtained TSDC results show that the trap density peak is not significantly shifted in temperature when the silica is modified with functional groups elementally similar to the polymer matrix. However, their incorporation influences the traps density and suppress the deeper traps occurring near the range of the melting temperature of PP. When the silica surface is modified with a precursor containing a hetero element, it has an effect on both, trap level depth as well as density. Depending on the type of the hetero element (sulfur, nitrogen, oxygen), the trap depth shifted to higher temperatures, and the trap density decreased to significantly lower levels. Nitrogen appears to have the strongest effect on the charge trap properties. All these first stage of results show that incorporation of modified nanosilica into a PP matrix seems to be a promising approach to tailor its electric properties. Further development of these composites would lead to benefits for high-voltage cable and capacitors applications.

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Section: Resultsmentioning

confidence: 76%

Surface Modification of Fumed Silica by Dry Silanization for PP-based Dielectric Nanocomposites

Mahtabani

Rytöluoto

et al. 2019

2019 2nd International Conference on Electrical Materials and Power Equipment (ICEMPE)

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“…This method involves heating up the silica powder from room temperature to 850 °C with a rate of 20 °C/min while measuring the weight loss of the sample. The weight loss between 300-850 °C can be attributed to the thermal decomposition of this silane coupling agent chemically bonded to the silica surface [16]. Fig.…”

Section: Thermal Gravimetric Analysis (Tga)mentioning

confidence: 99%

Effect of Silica Modification on Charge Trapping Behavior of PP blend/Silica Nanocomposites

Mahtabani

Rytöluoto

et al. 2019

2019 2nd International Conference on Electrical Materials and Power Equipment (ICEMPE)

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Various dielectric nanocomposite materials are studied in the frame of the European Commission funded project GRIDABLE. This project has the aim to develop DC cable extruded insulation and medium and low voltage DC capacitor films exhibiting enhanced performance with respect to presently used materials. The nanocomposites intended for cable applications are based on polypropylene (PP) blends filled with surface modified nano-silica particles. The surface modification is carried out via the state-of-the-art solution method using a polar silane as the modifying agent. Thermally Stimulated Depolarization Current (TSDC) measurements were carried out in order to study the charge trapping behavior of the nanocomposite samples. TSDC results indicate that the addition of the treated nano-silica, for most cases, reduces the density of the deep traps significantly. While more detailed studies are necessary, these results imply that the depth and the density of the deep trap states is profoundly influenced by the level of the silica modification i.e. the amount of the grafted silane on the silica surface.

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“…This peak confirms that the APTES was not just impregnated but successfully grafted onto the FAC support. As previously observed in the work of Qiao et al, the more APTES is grafted upon the support the larger the DTGA peak at 500°C . By comparing the weight loss in this peak and that in the first peak, one might be able to quantify what proportion of the loaded APTES is actually grafted and what proportion exists as free‐amine.…”

Section: Resultsmentioning

confidence: 75%

CO₂ adsorption testing on fly ash derived cancrinite‐type zeolite and its amine‐functionalized derivatives

Dindi

Quang

Abu-Zahra

2018

Env Prog and Sustain Energy

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Fly ash was converted to a Cancrinite‐type zeolite and then functionalized with various amines to investigate its ability to adsorb CO2. Fly ash was first subjected to thermal‐alkaline treatment followed by hydrothermal treatment to remove unburned carbon and transform it into a cancrinite‐type zeolite before being functionalized with either 3‐aminopropyltriethoxysilane (APTES), diethanolamine (DEA), or monoethanolamine (MEA). The resulting Cancrinite and its functionalized products were characterized by various techniques to confirm the success of fly ash to Cancrinite transformation and functionalization method. Cancrinite has significant improvement in surface area (77.7 m2 g−1) in comparison with original fly ash (11.2 m2 g−1), but its CO2 adsorption is very poor, about 6.6 mg g−1. Amine functionalization caused a reduction in the surface area and porosity of the fly ash Cancrinite, however, it enhanced the CO2 adsorption significantly. While the sorbents impregnated with DEA and MEA had higher CO2 adsorption capacities (49 and 84 mg CO2/g adsorbent respectively) than the sorbent grafted with APTES (24 mg CO2/g adsorbent), the grafted sorbent was more stable over multiple adsorption–desorption cycles. This study demonstrated that fly ash‐derived Cancrinite‐type zeolite has low CO2 adsorption in spite of its high surface area, however, its CO2 adsorption can be improved by amine‐functionalization. © 2018 American Institute of Chemical Engineers Environ Prog, 38: 77–88, 2019

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High density silanization of nano-silica particles using γ-aminopropyltriethoxysilane (APTES)

Cited by 162 publications

References 39 publications

Surface Modification of Fumed Silica by Dry Silanization for PP-based Dielectric Nanocomposites

Surface Modification of Fumed Silica by Dry Silanization for PP-based Dielectric Nanocomposites

Effect of Silica Modification on Charge Trapping Behavior of PP blend/Silica Nanocomposites

CO₂ adsorption testing on fly ash derived cancrinite‐type zeolite and its amine‐functionalized derivatives

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High density silanization of nano-silica particles using γ-aminopropyltriethoxysilane (APTES)

Cited by 162 publications

References 39 publications

Surface Modification of Fumed Silica by Dry Silanization for PP-based Dielectric Nanocomposites

Surface Modification of Fumed Silica by Dry Silanization for PP-based Dielectric Nanocomposites

Effect of Silica Modification on Charge Trapping Behavior of PP blend/Silica Nanocomposites

CO2 adsorption testing on fly ash derived cancrinite‐type zeolite and its amine‐functionalized derivatives

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CO₂ adsorption testing on fly ash derived cancrinite‐type zeolite and its amine‐functionalized derivatives