pH-mediated control over the mesostructure of ordered mesoporous materials templated by polyion complex micelles
| Autor: | Philippe Dieudonné, Mélody Mathonnat, Nathalie Marcotte, Jason Richard, Thomas Cacciaguerra, Martin In, Patrick Lacroix-Desmazes, Emilie Molina, Corine Gérardin |
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| Přispěvatelé: | Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier (ICGM ICMMM), Ecole Nationale Supérieure de Chimie de Montpellier (ENSCM)-Centre National de la Recherche Scientifique (CNRS)-Université de Montpellier (UM)-Université Montpellier 1 (UM1)-Université Montpellier 2 - Sciences et Techniques (UM2)-Institut de Chimie du CNRS (INC), Laboratoire Charles Coulomb (L2C), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS) |
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
polyion complex micelles
General Physics and Astronomy 02 engineering and technology mesoporous materials polyion electrostatic complexation 010402 general chemistry lcsh:Chemical technology 01 natural sciences Micelle lcsh:Technology Full Research Paper double-hydrophilic block copolymer Silicon alkoxide chemistry.chemical_compound hybrid organic–inorganic interface Nanotechnology [CHIM]Chemical Sciences nanostructured materials General Materials Science Lamellar structure lcsh:TP1-1185 Electrical and Electronic Engineering lcsh:Science Acrylic acid Acrylate Ethylene oxide lcsh:T Mesoporous silica 021001 nanoscience & nanotechnology lcsh:QC1-999 0104 chemical sciences Nanoscience hybrid organic-inorganic interface Chemical engineering chemistry lcsh:Q 0210 nano-technology Mesoporous material lcsh:Physics |
| Zdroj: | Beilstein Journal of Nanotechnology, Vol 10, Iss 1, Pp 144-156 (2019) Beilstein Journal of Nanotechnology Beilstein Journal of Nanotechnology, Karlsruhe Institute of Technology., 2019, 10, pp.144-156. ⟨10.3762/bjnano.10.14⟩ |
| ISSN: | 2190-4286 |
| DOI: | 10.3762/bjnano.10.14⟩ |
| Popis: | Ordered mesoporous silica materials were prepared under different pH conditions by using a silicon alkoxide as a silica source and polyion complex (PIC) micelles as the structure-directing agents. PIC micelles were formed by complexation between a weak polyacid-containing double-hydrophilic block copolymer, poly(ethylene oxide)-b-poly(acrylic acid) (PEO-b-PAA), and a weak polybase, oligochitosan-type polyamine. As both the micellization process and the rate of silica condensation are highly dependent on pH, the properties of silica mesostructures can be modulated by changing the pH of the reaction medium. Varying the materials synthesis pH from 4.5 to 7.9 led to 2D-hexagonal, wormlike or lamellar mesostructures, with a varying degree of order. The chemical composition of the as-synthesized hybrid organic/inorganic materials was also found to vary with pH. The structure variations were discussed based on the extent of electrostatic complexing bonds between acrylate and amino functions and on the silica condensation rate as a function of pH. |
| Databáze: | OpenAIRE |
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