MCM-41 silica monoliths with independent control of meso- and macroporosity

Babin, Jérôme; Iapichella, Julien; Lefèvre, Benoît; Biolley, Christine; Bellat, Jean‐Pierre; Fajula, François; Galarneau, Anne

doi:10.1039/b711544j

Cited by 79 publications

(69 citation statements)

References 47 publications

(71 reference statements)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…For a constant composition of the mixture (1 Si:14.21 H2O:0.60 EO unit:0.26 HNO3) increasing the size of the polymer increases the size of the macropore and in the same time of the skeleton thickness. For PEO of 20, 35, and 100 kDa, macropore sizes of 4, 10, and 16 microns and skeleton thickness of 3, 6, and 7 microns have been obtained, respectively [9]. Lower molecular weight PEO polymers interact more strongly with silica oligomers via multiple interactions, they adsorb at the surface of the silica oligomer and cover the particle, leading to a faster condensation of the silica oligomers and favor the sol-gel transition, resulting in smaller pores.…”

Section: Control Of Macroporositymentioning

confidence: 99%

“…The size and topology of the silica-rich phase will determine the size and topology of the monolith skeleton and the size and topology of the water-rich phase the size and topology of the pore network. The pore size is controlled by the rate of the silica condensation, which in turn is controlled by the temperature, the amount of acid, the amount and type of polymer [8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Synthesis and Textural Characterization of Mesoporous and Meso-/Macroporous Silica Monoliths Obtained by Spinodal Decomposition

et al. 2016

Self Cite

View full text Add to dashboard Cite

Silica monoliths featuring either mesopores or flow-through macropores and mesopores in their skeleton are prepared by combining spinodal phase separation and sol-gel condensation. The macroporous network is first generated by phase separation in acidic medium in the presence of polyethyleneoxides while mesoporosity is engineered in a second step in alkaline medium, possibly in the presence of alkylammonium cations as surfactants. The mesoporous monoliths, also referred as aerogels, are obtained in the presence of alkylpolyethylene oxides in acidic medium without the use of supercritical drying. The impact of the experimental conditions on pore architecture of the monoliths regarding the shape, the ordering, the size and the connectivity of the mesopores is comprehensively discussed based on a critical appraisal of the different models used for textural analysis.

show abstract

Section: Control Of Macroporositymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Synthesis and Textural Characterization of Mesoporous and Meso-/Macroporous Silica Monoliths Obtained by Spinodal Decomposition

et al. 2016

Self Cite

View full text Add to dashboard Cite

show abstract

“…The next step consists in a hydrothermal treatment at 120ºC for 6 h. The high temperature produces the urea decomposition, which increases the pH up to 9-10 and forms the mesoporous structure of the silica. The combination of the basic medium, the high temperature and the pressure inside the autoclave (or the sealed vessel) produces the solution/precipitation reactions of the silica 8,10,32 . At the same time, the spinodal decomposition takes place in the gel.…”

Section: Surface Mediated Fillings Formation Mechanismmentioning

confidence: 99%

Synthesis of Robust Hierarchical Silica Monoliths by Surface-Mediated Solution/Precipitation Reactions over Different Scales: Designing Capillary Microreactors for Environmental Applications

García-Aguilar

Miguel-García

Berenguer-Murcia

et al. 2014

ACS Appl. Mater. Interfaces

View full text Add to dashboard Cite

ABSTRACT:A new synthetic procedure to prepare novel materials (Surface Mediated Fillings) based on robust hierarchical monoliths has been developed. The methodology includes the deposition of a (micro-or mesoporous) silica thin film on the support followed by the growth of a porous monolithic SiO 2 structure. It has been demonstrated that this synthesis is viable for supports of different chemical nature with different inner diameters without any shrinkage of the silica filling. The mechanism of the formation of the Surface Mediated Fillings is based on a solution/precipitation process and the anchoring of the silica filling to the deposited thin film. The interaction between the two SiO 2 structures (monolith and thin film) depends on the porosity of the thin film and yields composite materials with different mechanical stability. The synthetic procedure described here allows the preparation of novel materials for many interesting applications, such as reactors, microreactors or HPLC columns.

show abstract

“…Such materials contain micron size pores that significantly reduce the back pressures associated with columns comprised of silica particles resulting in high flow rates.. 10 The monoliths are typically prepared via a sol-gel process by hydrolysis of silicon alkoxide precursors in the presence of a polymer such as polyethylene oxide acid in an acidic medium. 43 Controlled phase separation leads to silica-rich and water-rich regions of the structure. Removal of the aqueous phase gives rise 15 to the macroporous structure of the monolith with pore diameters of 1 -50 m.…”

Section: Silica Monolithsmentioning

confidence: 99%

Immobilisation of enzymes on mesoporous silicate materials

2013

View full text Add to dashboard Cite

Mesoproous silicates (MPS) are attractive materials for the immobilisation of enzymes. They possess 5 ordered pore structures, narrow pore size distributions, large surface areas, high stability and can be chemically modified with various functional groups. The properties of MPS materials are reviewed in terms of their ability to act as supports for enzymes for use in biocatalysis with a particular focus on the ability to tailor the surface functionalization of the MPS to suit a specific enzyme. While many reports of the immobilisation of enzymes on MPS have been described, their use as biocatalytic supports is limited. 10Large scale reactors based on MPS will require continuous flow systems where the properties of the support can be tailored while allowing fluid flow at reasonable low pressure.

show abstract

MCM-41 silica monoliths with independent control of meso- and macroporosity

Cited by 79 publications

References 47 publications

Synthesis and Textural Characterization of Mesoporous and Meso-/Macroporous Silica Monoliths Obtained by Spinodal Decomposition

Synthesis and Textural Characterization of Mesoporous and Meso-/Macroporous Silica Monoliths Obtained by Spinodal Decomposition

Synthesis of Robust Hierarchical Silica Monoliths by Surface-Mediated Solution/Precipitation Reactions over Different Scales: Designing Capillary Microreactors for Environmental Applications

Immobilisation of enzymes on mesoporous silicate materials

Contact Info

Product

Resources

About