TAILORING THE PORE STRUCTURE OF MESOPOROUS SILICA BY USINGAMPHIPHILIC BLOCK COPOLYMER AND CONTROLOF AGING TEMPERATURE

Authors

  • Wafia M. Emhalha Department of Chemistry, Faculty of Science, Sirte University, Sirte, Libya
  • Farid M. Hota Department of Chemistry, Faculty of Science, Sirte University, Sirte, Libya

DOI:

https://doi.org/10.53555/eijas.v6i1.105

Keywords:

surface curvature, hexagonal, Fm3m, pore size, aging temperature, structural transformation

Abstract

Synthesis of mesoporous silica materials has been studied using Pluronic triblock copolymer F127 nonionic amphiphilic triblock copolymer (EO106 PO70 EO106) as high molecular weight structure-directing agent and TEOS as a silica source. The mesostructure of the silica material obtained, as determined by High Resolution Transmission electron microscopy (HRTEM), Atomic Force Microscopy (AFM), and nitrogen adsorption–desorption isotherm. Changing the amount of surfactant has effect on the porosity of the material, where increasing the amount of surfactant has effect on the hydrophobic surface curvature of the micelle and correspondingly the particle morphology. The particle morphology has changed from hexagonal to cubic Fm3m symmetry, with different pore sizes. Some samples with the same molar ratio have different unit cell size according to the change in aging temperature. HRTEM-ED shows cubic and cage structure of pores under optimum conditions of synthesis. The structural transformation is limited.

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Published

2020-03-27

Issue

Vol. 6 No. 1 (2020): EPH - International Journal of Applied Science ( ISSN: 2208-2182 )

Section

Articles

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