Vol 7, No 6 (2016) > Metalurgy and Material Engineering >

Effect of Different Pluronic P123 Triblock Copolymer Surfactant Concentrations on SBA-15 Pore Formation

Donanta Dhaneswara, Nofrijon Sofyan

 

Abstract: Santa Barbara
Amorphous-15 (SBA-15) is an
interesting mesoporous silica material with highly ordered nanopores and a
large surface area. Due to its unique properties, this material has been widely
employed in many areas. This study aimed to predict the number of nanopores per
gram of SBA-15 material based on an optimum value of surfactant addition at the
desired number of nanopores. For this purpose, SBA-15 was synthesized via a
sol-gel process using tetraethyl orthosilicate (TEOS, Si(OC2H5)4)
as a precursor and pluronic P123 triblock copolymer surfactant (EO20PO70EO20,
EO = ethylene oxide, PO = propylene oxide) as a template. There were five
different surfactant concentrations, namely 0.35, 2.50, 2.70, 3.00, and 3.30
millimoles, used with a fixed concentration of TEOS. The characterization was
performed using small-angle x-ray scattering (SAXS), adsorption-desorption
(BET), and transmission electron microscopy (TEM). The results showed that the
surfactant concentration did not affect the crystal structure, although an
increase in the surfactant concentration linearly correlated with an increase
in the surface area. The shape and size of the pore diameter tends to be
approximately 3 nm, as characterized using BET adsorption-desorption. The
optimum concentration of surfactant for the formation of mesoporous SBA-15
material was 2.70 millimoles. The value obtained in this study was in
accordance with the calculated value, indicating that the theoretical
calculations can be used to experimentally predict the number of pores.
Keywords: Mesopores; Pluronic P123; SBA-15; Surfactant; Template

Full PDF Download

References


Andriayani, A., Sembiring, S.B., Aksara, N., Sofyan, N., 2013. Synthesis of Mesoporous Silica from Tetraethylorthosilicate by using Sodium Ricinoleic as a Template and 3-Aminopropyltrimethoxysilane as Co-Structure Directing Agent with Volume Variation of Hydrochloric Acid 0.1 M. Advanced Materials Research, Volume 789, pp. 124–131

Anjum, A., Ilyas, M.U., 2013. Activity Recognition using Smartphone Sensors. First Workshop on People Centric Sensing and Communications. Las Vegas

Gao, C., Zhang, T., Gao, P., Zhao, Y., 2013. Bridged-ferrocene Functionalized Mesoporous SBA-15 Material Prepared via Evaporation-Induced Self-Assembly. Journal of Porous Materials, Volume 20(1), pp. 47–53

Göltner, C.G., Henke, S., Weissenberger, M.C., Antonietti, M., 1998. Mesoporous Silica from Lyotropic Liquid Crystal Polymer Template. Angewandte Chemie International Edition, Volume 37(5), pp. 613–616

Gregg, S.J., Sing, K.S.W., 1982. Adsorption, Surface Area and Porosity. Second Edition, London, Academic Press

Lu, G.Q., Zhao, X.S., 2004. Nanoporous Materials – An Overview. In: Nanoporous Materials-Science and Engineering, Edited by G.Q. Lu and X.S. Zhao, Imperial College Press, London, pp. 1–13

Porter, M.R., 1991. Handbook of Surfactan. New York, Chapman and Hall

R.M.A., Rouqe-Malherbe, 2007. Adsorption and Diffusion in Nanoporous Material. New York, CRC Press, Taylor & Francis Group

Rahmat, N., Zuhairi, A.A., Mohamed, A.R., 2010. A Review: Mesoporous Santa Barbara Amorphous-15, Types, Synthesis and Its Applications towards Biorefinery Production. American Journal of Applied Sciences, Volume 7(12), pp. 1579–1586

Ravikovitch, P.I., Neimark, A.V., 2001. Characterization of Micro- and Mesoporosity in SBA-15 Materials from Adsorption Data by the NLDFT Method. Journal of Physical Chemistry B, Volume 105(29), pp. 6817–6823

Ruthstein, S., Frydman, V., Kababya, S., Landau, M., Goldfarb, D., 2003. Study of the Formation of the Mesoporous Material SBA-15 by EPR Spectroscopy. Journal of Physical Chemistry B, Volume 107(8), pp. 1739–1748

Ruthstein, S., Schmidt, J., Kesselman, E., Talmon, Y., Goldfarb, D., 2006. Resolving Intermediate Solution Structures during the Formation of Mesoporous SBA-15. Journal of American Chemical Society, Volume 128(10), pp. 3366–3374

Stevens, W.J.J., Lebeau, K., Mertens, M., van Tendeloo, G., Cool, P., Vansant E.F., 2006. Investigation of the Morphology of the Mesoporous SBA-16 and SBA-15 Materials. Journal of Physical Chemistry B, Volume 110(18), pp. 9183–9187

Su, F., Zeng, J., Bao, X., Yu, Y., Lee, J.Y., Zhao, X.S., 2005. Preparation and Characterization of Highly Ordered Graphitic Mesoporous Carbon as a Pt Catalyst Support for Direct Methanol Fuel Cells. Chemistry of Materials, Volume 17(15), pp. 3960–3967

Thielemann, J.P., Girgsdies, F., Schlögl, R., Hess, C., 2011. Pore Structure and Surface Area of Silica SBA-15: Influence of Washing and Scale-Up. Beilstein Journal of Nanotechnology, Volume 2, pp. 110–118

Wanka, G., Hoffmann, H., Ulbricht, W., 1994. Phase-Diagrams and Aggregation Behavior of Poly(Oxyethylene)-Poly(Oxypropylene)-Poly(Oxyethylene) Triblock Copoly-mers in Aqueous-Solutions. Macromolecules, Volume 27(15), pp. 4145–4159

Zhang, F., Yan, Y., Yang, H., Meng, Y., Yu, C., Tu, B., Zhao, D., 2005. Understanding Effect of Wall Structure on the Hydrothermal Stability of Mesostructured Silica SBA-15. Journal of Physical Chemistry B, Volume 109(18), pp. 8723–8732

Zhao, D., Feng, J., Huo, Q., Melosh, N., Glenn, H., Chmelka, B.F., Stucky, G.D., 1998. Triblock Copolymer Syntheses of Mesoporous Silica with Periodic 50 to 300 Angstrom Pores. Science, Volume 279(5350), pp. 548–552

Zhao, D., Huo, Q., Feng, J., Chmelka, B.F., Stucky, G.D., 1998. Nonionic Triblock and Star Diblock Copolymer and Oligomeric Surfactant Syntheses of Highly Ordered, Hydrothermally Stable, Mesoporous Silica Structures. Journal of American Chemical Society, Volume 120(39), pp. 6024–6036

Zhao, D., Sun, J., Li, Q., Stucky, G.D., 2000. Morphological Control of Highly Ordered Mesoporous Silica SBA-15. Chemistry Materials, Volume 12(2), pp. 275–279