Effect of sodium bicarbonate solution on methyltrimethoxysilane-derived silica aerogels dried at ambient pressure

doi:10.1007/s11705-020-2028-4

Front. Chem. Sci. Eng.

2021, Vol. 15

Issue (4) : 954-959 https://doi.org/10.1007/s11705-020-2028-4

RESEARCH ARTICLE

Effect of sodium bicarbonate solution on methyltrimethoxysilane-derived silica aerogels dried at ambient pressure

Yujing Liu¹(

), Xiao Han¹, Balati Kuerbanjiang², Vlado K. Lazarov², Lidija Šiller¹(

)

¹. School of Engineering, Newcastle University, Newcastle upon Tyne NE1 7RU, UK
². Department of Physics, University of York, York YO10 5DD, UK

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Abstract

Here we present an economical ambient pressure drying method of preparing monolithic silica aerogels from methyltrimethoxysilane precursor while using sodium bicarbonate solution as the exchanging solvent. We prepared silica aerogels with a density and a specific surface area of 0.053 g∙cm⁻³ and 423 m²∙g⁻¹, respectively. The average pore diameter of silica aerogels is 23 nm as the pore specific volume is 1.11 cm³∙g⁻¹. Further, the contact angle between water droplet and the surface of silica aerogels in specific condition can be as high as 166°, which indicates a super-hydrophobic surface of aerogels.

Keywords silica aerogel methyltrimethoxysilane solvent exchange sodium bicarbonate trimethylchlorosilane ambient pressure drying

Corresponding Author(s): Yujing Liu,Lidija Šiller

Just Accepted Date: 20 January 2021 Online First Date: 03 March 2021 Issue Date: 04 June 2021

Cite this article:

Yujing Liu,Xiao Han,Balati Kuerbanjiang, et al. Effect of sodium bicarbonate solution on methyltrimethoxysilane-derived silica aerogels dried at ambient pressure[J]. Front. Chem. Sci. Eng., 2021, 15(4): 954-959.

URL:

https://academic.hep.com.cn/fcse/EN/10.1007/s11705-020-2028-4
https://academic.hep.com.cn/fcse/EN/Y2021/V15/I4/954

Fig.1 MTMS-derived SAs via APD method while using (a) deionized water, (b) hexane, (c) 0.044 g?mL⁻¹ sodium bicarbonate solution, (d) 0.022 g?mL⁻¹ sodium bicarbonate solution in solvent exchange step, respectively along with (e) sample A3 after extra wash to remove salt.

Fig.2 XRD 2θ scans of MTMS-derived SAs using (a) deionized water, (b) hexane, (c) 0.044 g?mL⁻¹ and (d) 0.022 g?mL⁻¹ sodium bicarbonate solution in solvent exchange step, respectively. Peaks (1–5) appearing on patterns of c and d belong to NaCl (200), (220), (222), (400) and (420), which could be removed by extra wash with mixed solvent of ethanol and deionized water (E).

Tab.1 Physical properties of MTMS-derived SAs using deionized water (A1), hexane (A2), 0.044 g?mL⁻¹ (A3) and 0.022 g?mL⁻¹ sodium bicarbonate solution (A4) in solvent exchange step, respectively along with properties of sample A5 (A3 with extra wash prior to APD process)

Fig.3 SEM images of MTMS-derived SAs via APD method with the solvent exchange step with (a) deionized water, (b) hexane, (c) 0.044 g?mL⁻¹ and (d) 0.022 g?mL⁻¹ sodium bicarbonate solution, respectively.

Fig.4 FTIR spectra of MTMS-derived SAs using (a) deionized water, (b) hexane, (c) 0.044 g?mL⁻¹ and (d) 0.022 g?mL⁻¹ sodium bicarbonate solution in solvent exchange step, respectively.

Fig.5 TEM images of MTMS-derived SAs using in solvent exchange step (a) deionized water, (b) hexane, (c) 0.044 g?mL⁻¹ and (d) 0.022 g?mL⁻¹ sodium bicarbonate solution, respectively.

Fig.6 Observations of hydrophobicity of (a–c) MTMS-derived SAs and (d–g) contact angle measurement of deionized water droplet and samples surface. A2, A3, A4 are MTMS-derived SAs using (d) hexane, (e) 0.044 g?mL⁻¹ sodium bicarbonate solution and (f) 0.022 g?mL⁻¹ sodium bicarbonate solution, respectively.

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