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      Role of organic and inorganic additives on the assembly of CTAB-P123 and the morphology of mesoporous silica particles

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      Author
      Poyraz, A. S.
      Dag, Ö.
      Date
      2009
      Source Title
      Journal of Physical Chemistry C
      Print ISSN
      1932-7447
      Volume
      113
      Issue
      43
      Pages
      18596 - 18607
      Language
      English
      Type
      Article
      Item Usage Stats
      112
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      145
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      Abstract
      Mesoporous silica particles with various morphologies and structures have been synthesized by controlling the solubility, micellization, and assembly of a charged surfactant (cethyltrimethylammonium bromide, CTAB) and a pluronic (PEO20PPO70PEO20, P123) couple using an organic (benzene) or an inorganic (SO4 2-, NO3 -, or Cl-) additive. The effect of CTAB, with or without one of the Hofmeister ions or benzene in various concentrations, on the morphology, pore-size, pore-structure and the nature of the silica particles has been investigated. Increasing the lyotropic anion (SO4 2-) or benzene concentration of the synthesis media creates wormlike particles with enlarged pores and reduced wall thickness. However, the hydrotropic anion (NO3 -) influenced the solubility of the charged surfactant and increased the CTAB concentration in the CTAB-P123 micelles, and as a result, in the mesoporous silica particles. The surface area, unit cell, and pore size of the silica particles are diminished by increasing the nitrate ion centration. The effects of the Cl- ion are between the SO4 2- and NO3 -ions. It influenced the P123 at low and CTAB at high concentrations. At low CTAB/ P123 mol ratios, the Cl- ion affects mainly the P123, but at high CTAB/P123 it affects both the CTAB and P123. By carefully adjusting these ingredients (CTAB, SO4 2-, Cl-, NO3 - and benzene), not only the morphology of the particles, but also the pore-size and pore-structure of the mesoporous silica particles could be adjusted. The investigations were carried out by preparing a series of powder samples and, by varying the CTAB/P123 mol ratio (between 3.0 and 6.0) and the concentration of the organic (0.17 to 0.90 M) or inorganic (at 0.25, 0.50, or 1.00 M) additive in the synthesis media. The powder samples were analyzed using microscopy (SEM, TEM, and POM), diffraction (PXRD), and spectroscopy (FTIR, Raman, UV-vis, and EDS) techniques toward above goals. © 2009 American Chemical Society.
      Keywords
      Benzene concentration
      Centration
      Charged surfactants
      Concentration of
      FTIR
      High concentration
      Inorganic additives
      Lyotropics
      Mesoporous silica particles
      Nitrate ions
      Pluronics
      Powder samples
      Reduced wall
      SEM
      Silica particles
      Surface area
      Synthesis media
      TEM
      Unit cells
      Wormlike particles
      Additives
      Benzene
      Concentration (process)
      Fourier transform infrared spectroscopy
      Mesoporous materials
      Morphology
      Pore size
      Silica
      Solubility
      Surface active agents
      Synthesis (chemical)
      Ternary systems
      Ions
      Permalink
      http://hdl.handle.net/11693/22565
      Published Version (Please cite this version)
      http://dx.doi.org/10.1021/jp907303a
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