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

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dc.citation.epage18607en_US
dc.citation.issueNumber43en_US
dc.citation.spage18596en_US
dc.citation.volumeNumber113en_US
dc.contributor.authorPoyraz, A. S.en_US
dc.contributor.authorDag, Ö.en_US
dc.date.accessioned2016-02-08T10:01:47Z
dc.date.available2016-02-08T10:01:47Z
dc.date.issued2009en_US
dc.departmentDepartment of Chemistryen_US
dc.description.abstractMesoporous 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.en_US
dc.identifier.doi10.1021/jp907303aen_US
dc.identifier.issn1932-7447
dc.identifier.urihttp://hdl.handle.net/11693/22565
dc.language.isoEnglishen_US
dc.relation.isversionofhttp://dx.doi.org/10.1021/jp907303aen_US
dc.source.titleJournal of Physical Chemistry Cen_US
dc.subjectBenzene concentrationen_US
dc.subjectCentrationen_US
dc.subjectCharged surfactantsen_US
dc.subjectConcentration ofen_US
dc.subjectFTIRen_US
dc.subjectHigh concentrationen_US
dc.subjectInorganic additivesen_US
dc.subjectLyotropicsen_US
dc.subjectMesoporous silica particlesen_US
dc.subjectNitrate ionsen_US
dc.subjectPluronicsen_US
dc.subjectPowder samplesen_US
dc.subjectReduced wallen_US
dc.subjectSEMen_US
dc.subjectSilica particlesen_US
dc.subjectSurface areaen_US
dc.subjectSynthesis mediaen_US
dc.subjectTEMen_US
dc.subjectUnit cellsen_US
dc.subjectWormlike particlesen_US
dc.subjectAdditivesen_US
dc.subjectBenzeneen_US
dc.subjectConcentration (process)en_US
dc.subjectFourier transform infrared spectroscopyen_US
dc.subjectMesoporous materialsen_US
dc.subjectMorphologyen_US
dc.subjectPore sizeen_US
dc.subjectSilicaen_US
dc.subjectSolubilityen_US
dc.subjectSurface active agentsen_US
dc.subjectSynthesis (chemical)en_US
dc.subjectTernary systemsen_US
dc.subjectIonsen_US
dc.titleRole of organic and inorganic additives on the assembly of CTAB-P123 and the morphology of mesoporous silica particlesen_US
dc.typeArticleen_US

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