Abstract
Methylchlorosilanes (MSCs) of the type (CH3)nSiCl4−n (n = 1, 2, 3) are usually used for surface modification of silica aerogels (SAs), in which the quantity of Si–Cl and Si–CH3 groups deeply affects the properties of prepared SAs. In this work, methyltrichlorosilane (MTCS, n = 1), dimethyldichlorosilane (DMDCS, n = 2), and trimethylchlorosilane (TMCS, n = 3) were used to modify wet gels and the effects of Si–Cl and Si–CH3 groups’ quantity on microstructures and surface properties were explored in detail. It turned out that the MTCS modified SA (MSA) possessed the most compact and nonuniform three-dimensional nanostructure among the three SAs, accompanied by the biggest density of ~ 0.14 g/cm3. Further investigations demonstrated that all the three SAs had similar BET surface area of about 900 m2/g and average pore size of 10–15 nm. Though FTIR analysis presented the discrepancies obviously among the three SAs, the thermal stability of the three SAs was similar, with the onset and peak temperatures in the exothermic reaction of methyl groups being ~ 240 °C and ~ 270 °C, respectively. The best hydrophobicity belonged to the TSA, verified by the biggest contact angles of 155°. Thus, all these indicated that the properties of the three SAs were deeply related to the quantity of Si–Cl and Si–CH3 groups in MCS.
Similar content being viewed by others
References
Al-Oweini R, El-Rassy H (2009) Synthesis and characterization by FTIR spectroscopy of silica aerogels prepared using several Si(OR)4 and R″Si(OR′)3 precursors. J Mol Struct 919:140–145. https://doi.org/10.1016/j.molstruc.2008.08.025
Anas M, Ünsal S, Erkey C (2017) Investigation of various aerogels as adsorbents for methane storage. J Supercrit Fluids. https://doi.org/10.1016/j.supflu.2017.11.032
Cheng X, Li C, Shi X et al (2017) Rapid synthesis of ambient pressure dried monolithic silica aerogels using water as the only solvent. Mater Lett 204:157–160. https://doi.org/10.1016/j.matlet.2017.05.107
Gurav JL, Rao AV, Rao AP et al (2009) Physical properties of sodium silicate based silica aerogels prepared by single step sol–gel process dried at ambient pressure. J Alloys Compd 476:397–402. https://doi.org/10.1016/j.jallcom.2008.09.029
Huang Y, He S, Feng M et al (2019) Organic solvent-saving preparation of water glass based aerogel granules under ambient pressure drying. J Non-Cryst Solids 521:119507. https://doi.org/10.1016/j.jnoncrysol.2019.119507
Hüsing N, Schubert U (1998) Aerogels—airy materials: chemistry, structure, and properties. Angew Chem Int Ed 37:22–45. https://doi.org/10.1002/(SICI)1521-3773(19980202)37:1/2<22::AID-ANIE22>3.0.CO;2-I
Hwang S-W, Kim T-Y, Hyun S-H (2010) Effect of surface modification conditions on the synthesis of mesoporous crack-free silica aerogel monoliths from waterglass via ambient-drying. Microporous Mesoporous Mater 130:295–302. https://doi.org/10.1016/j.micromeso.2009.11.024
Iswar S, Malfait WJ, Balog S et al (2016) Effect of aging on silica aerogel properties. Microporous Mesoporous Mater 241:293–302. https://doi.org/10.1016/j.micromeso.2016.11.037
Kistler SJ (1932) Coherent expanded-aerogels. J Phys Chem 36. https://doi.org/10.1021/j150331a003
Latthe SS, Imai H, Ganesan V, Rao AV (2009) Superhydrophobic silica films by sol–gel co-precursor method. Appl Surf Sci 256:217–222. https://doi.org/10.1016/j.apsusc.2009.07.113
Li Z, Cheng X, He S, Shi X, Yang H (2015) Characteristics of ambient-pressure-dried aerogels synthesized via different surface modification methods. J Sol-Gel Sci Technol 76:138–149. https://doi.org/10.1007/s10971-015-3760-y
Li M, Jiang H, Xu D et al (2016) Low density and hydrophobic silica aerogels dried under ambient pressure using a new co-precursor method. J Non-Cryst Solids 452:187–193. https://doi.org/10.1016/j.jnoncrysol.2016.09.001
Li Z, Cheng X, Gong L et al (2018) Enhanced flame retardancy of hydrophobic silica aerogels by using sodium silicate as precursor and phosphoric acid as catalyst. J Non-Cryst Solids 481:267–275. https://doi.org/10.1016/j.jnoncrysol.2017.10.053
Li Z, Huang S, Shi L, Li Z, Liu Q, Li M (2019) Reducing the flammability of hydrophobic silica aerogels by doping with hydroxides. J Hazard Mater 373:536–546. https://doi.org/10.1016/j.jhazmat.2019.03.112
Luo Y, Li Z, Zhang W et al (2019) Rapid synthesis and characterization of ambient pressure dried monolithic silica aerogels in ethanol/water co-solvent system. J Non-Cryst Solids 503–504:214–223. https://doi.org/10.1016/j.jnoncrysol.2018.09.049
Mahadik DB, Rao AV, Rao AP, Wagh PB, Ingale SV, Gupta SC (2011) Effect of concentration of trimethylchlorosilane (TMCS) and hexamethyldisilazane (HMDZ) silylating agents on surface free energy of silica aerogels. J Colloid Interface Sci 356:298–302. https://doi.org/10.1016/j.jcis.2010.12.088
Mahadik SA, Pedraza F, Parale VG, Park H-H (2016) Organically modified silica aerogel with different functional silylating agents and effect on their physico-chemical properties. J Non-Cryst Solids 453:164–171. https://doi.org/10.1016/j.jnoncrysol.2016.08.035
Olah GA, Prakash GKS, Wang Q, et al (2010) Methyltrichlorosilane. In: Encyclopedia of Reagents for Organic Synthesis. American Cancer Society
Pan Y, He S, Gong L et al (2017) Low thermal-conductivity and high thermal stable silica aerogel based on MTMS/Water-glass co-precursor prepared by freeze drying. Mater Des 113:246–253. https://doi.org/10.1016/j.matdes.2016.09.083
Rao AV, Kulkarni MM, Amalnerkar DP, Seth T (2003) Surface chemical modification of silica aerogels using various alkyl-alkoxy/chloro silanes. Appl Surf Sci 206:262–270. https://doi.org/10.1016/S0169-4332(02)01232-1
Rao AV, Latthe SS, Dhere SL et al (2010) Control on wetting properties of spin-deposited silica films by surface silylation method. Appl Surf Sci 256:2115–2121. https://doi.org/10.1016/j.apsusc.2009.09.057
Rochow EG, Tatlock WS (2007) Dimethyldichlorosilane (dimethylsilicon dichloride). In: Inorganic Syntheses. Wiley-Blackwell, pp 56–58
Rojas F, Kornhauser I, Felipe C et al (2002) Capillary condensation in heterogeneous mesoporous networks consisting of variable connectivity and pore-size correlation. Phys Chem Chem Phys 4:2346–2355. https://doi.org/10.1039/b108785a
Schwertfeger F, Frank D, Schmidt M (1998) Hydrophobic waterglass based aerogels without solvent exchange or supercritical drying. J Non-Cryst Solids 225:24–29. https://doi.org/10.1016/S0022-3093(98)00102-1
Shao Z, Luo F, Cheng X, Zhang Y (2013) Superhydrophobic sodium silicate based silica aerogel prepared by ambient pressure drying. Mater Chem Phys 141:570–575. https://doi.org/10.1016/j.matchemphys.2013.05.064
Soleimani Dorcheh A, Abbasi MH (2008) Silica aerogel; synthesis, properties and characterization. J Mater Process Technol 199:10–26. https://doi.org/10.1016/j.jmatprotec.2007.10.060
Vareda JP, Maximiano P, Cunha LP, Ferreira AF, Simões PN, Durães L (2018) Effect of different types of surfactants on the microstructure of methyltrimethoxysilane-derived silica aerogels: a combined experimental and computational approach. J Colloid Interface Sci 512:64–76. https://doi.org/10.1016/j.jcis.2017.10.035
Venkateswara Rao A, Hegde ND, Shewale PM (2007) Imperviousness of the hydrophobic silica aerogels against various solvents and acids. Appl Surf Sci 253:4137–4141. https://doi.org/10.1016/j.apsusc.2006.09.015
Wang L-J, Zhao S-Y, Yang M (2009) Structural characteristics and thermal conductivity of ambient pressure dried silica aerogels with one-step solvent exchange/surface modification. Mater Chem Phys 113:485–490. https://doi.org/10.1016/j.matchemphys.2008.07.124
Wang J, Zhang Y, Wei Y, Zhang X (2015) Fast and one-pot synthesis of silica aerogels via a quasi-solvent-exchange-free ambient pressure drying process. Microporous Mesoporous Mater 218:192–198. https://doi.org/10.1016/j.micromeso.2015.07.019
Wu X, Fan M, Shen X et al (2018) Silica aerogels formed from soluble silicates and methyl trimethoxysilane (MTMS) using CO2 gas as a gelation agent. Ceram Int 44:821–829. https://doi.org/10.1016/j.ceramint.2017.10.005
Yang J, Wu H, Huang G et al (2017) Modeling and coupling effect evaluation of thermal conductivity of ternary opacifier/fiber/aerogel composites for super-thermal insulation. Mater Des 133:224–236. https://doi.org/10.1016/j.matdes.2017.07.056
Zhang W, Li Z, Shi L, Li Z, Luo Y, Liu Q, Huang R (2019) Methyltrichlorosilane modified hydrophobic silica aerogels and their kinetic and thermodynamic behaviors. J Sol-Gel Sci Technol 89:448–457. https://doi.org/10.1007/s10971-018-4882-9
Zhao S, Stojanovic A, Angelica E et al (2019) Phase transfer agents facilitate the production of superinsulating silica aerogel powders by simultaneous hydrophobization and solvent- and ion-exchange. Chem Eng J 122421. https://doi.org/10.1016/j.cej.2019.122421
Funding
This work was supported by the National Natural Science Foundation of China (No. 51904336), the Fundamental Research Funds for the Central Universities (grant number 502501003 and 202045001), and the China Scholarship Council (No. 201806375007).
Author information
Authors and Affiliations
Corresponding author
Ethics declarations
Conflict of interest
The authors declare that they have no competing interest
Additional information
Publisher’s note
Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.
Rights and permissions
About this article
Cite this article
Wu, X., Zhang, W., Li, Z. et al. Effects of various methylchlorosilanes on physicochemical properties of ambient pressure dried silica aerogels. J Nanopart Res 21, 234 (2019). https://doi.org/10.1007/s11051-019-4685-0
Received:
Accepted:
Published:
DOI: https://doi.org/10.1007/s11051-019-4685-0