Synthesis of lamellar mesostructured phenylene-bridged periodic mesoporous organosilicas (PMO) templated by polyion complex (PIC) micelles

Birault, Albane; Molina, Emilie; Carcel, Carole; Bartlett, John R.; Marcotte, Nathalie; Toquer, Guillaume; Lacroix‐Desmazes, Patrick; Gérardin, Corine; Man, Michel Wong Chi

doi:10.1007/s10971-018-4667-1

Cited by 10 publications

(8 citation statements)

References 21 publications

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“…1,4-Bis(triethoxysilyl)benzene (BTEB) was synthesized using the previously described method [50,51] and purified by distillation under vacuum. Pluronic P123 was obtained from Sigma Aldrich.…”

Section: Chemicalsmentioning

confidence: 99%

Single-template periodic mesoporous organosilica with organized bimodal mesoporosity

Laird

Carcel

Oliviero

et al. 2020

Microporous and Mesoporous Materials

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Periodic mesoporous organosilicas (PMOs) are obtained by the hydrolysiscondensation of organobridged triethoxysilane precursors in the presence of surfactants as structure-directing agents (SDAs). After removal of the SDAs, the resulting materials usually exhibit monomodal, well-organized mesoporosity, with the size of the pores being controlled by the SDA. However, despite the potential technological applications of such materials with well-organized bimodal porosity, to the best of our knowledge, PMOs exhibiting two distinct types of ordered mesoporosity have barely been described.Herein, we describe a simple approach for modulating the dimensions of ordered monomodal 2D hexagonal and bimodal porosity in PMOs synthesized from 1,4-bis(triethoxysilyl)benzene (BTEB) and Pluronic P123 under acidic conditions, by varying the addition sequence of reactants. The approach employs a single SDA without degradation of the BTEB precursor. Reaction conditions leading to the formation of monomodal and bimodal porosity within the templated PMOs are identified. Our approach exploits the competition between the rates of (a) BTEB hydrolysis/condensation; and (b) diffusion, solubilization and partitioning of the unhydrolyzed and hydrolyzed precursor within the micelles. A mechanism describing the evolution of porosity within this system is proposed.

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Section: Chemicalsmentioning

confidence: 99%

Single-template periodic mesoporous organosilica with organized bimodal mesoporosity

Laird

Carcel

Oliviero

et al. 2020

Microporous and Mesoporous Materials

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Section: Methodsmentioning

confidence: 99%

“…Bis-(triethoxysilylpropyl)amine azidoethane was synthesised using a procedure previously described by our group. 52 Similarly, BTEB was prepared following previously reported protocols 62,77 and purified by distillation under vacuum. Acryloyl chloride (Alfa), PAMAM-G3 dendrimer (Sigma Aldrich, 20% in MeOH), tetrabutylammonium fluoride (TBAF, Sigma Aldrich, 1 M solution in tetrahydrofuran (THF)), Pluronic P123 (Sigma Aldrich), DTT (Alfa Aesar, 98%), sodium gold tetrachloride (NaAuCl 4 , Sigma Aldrich, 99%) and sodium borohydride (NaBH 4 , Sigma Aldrich, 99.99%) were used as received (see Section S2.4 in the ESI † for details of gold impregnation experiments).…”

Section: Chemicalsmentioning

confidence: 99%

Mesoporous organosilicas with thiol functionalised pores: multifunctional dendrimers as sacrificial building block and template

et al. 2022

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“…Since 2008, we have been developing an original route for the synthesis of ordered mesoporous materials based on the use of non-conventional structure-directing agents. Ordered mesoporous silica and organosilica materials were prepared under mild acidic conditions by using polyion complex (PIC) micelles as versatile pH-sensitive structure-directing agents [23–24]. This route relies on the use of a weak polyacid double hydrophilic block copolymer (DHBC) able to form polyion complex micelles upon interaction with a weak polybase.…”

Section: Introductionmentioning

confidence: 99%

pH-mediated control over the mesostructure of ordered mesoporous materials templated by polyion complex micelles

Molina¹,

Mathonnat²,

Richard³

et al. 2019

Beilstein J. Nanotechnol.

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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.

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Synthesis of lamellar mesostructured phenylene-bridged periodic mesoporous organosilicas (PMO) templated by polyion complex (PIC) micelles

Cited by 10 publications

References 21 publications

Single-template periodic mesoporous organosilica with organized bimodal mesoporosity

Single-template periodic mesoporous organosilica with organized bimodal mesoporosity

Mesoporous organosilicas with thiol functionalised pores: multifunctional dendrimers as sacrificial building block and template

pH-mediated control over the mesostructure of ordered mesoporous materials templated by polyion complex micelles

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