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Journal of Sol-Gel Science and Technology

, Volume 90, Issue 1, pp 95–104 | Cite as

Sol–gel process and complex fluids: sculpting porous matter at various lengths scales towards the Si(HIPE), Si(PHIPE), and SBA-15-Si(HIPE) series

  • Armand Roucher
  • Véronique Schmitt
  • Jean-Luc Blin
  • Rénal BackovEmail author
ORIGINAL PAPER: NANO- AND MACROPOROUS MATERIALS (AEROGELS, XEROGELS, CRYOGELS, ETC.)
  • 159 Downloads

Abstract

Taking inspiration from diatom hierarchically organized porosity, synthetic porous monoliths have been synthesized through rational designs while combining sol–gel chemistry, emulsions, Pickering-based emulsions, and lyotropic mesophases. We have described the synthesis of the Si(HIPE) series employing traditional emulsions to tune the macroscopic void diameters and cationic surfactant molecules to both stabilize the oil/water interface at the macroscopic length scale and create vermicular poorly organized porosity at the mesoscopic length scale. In a second part, while substituting surfactant molecules with modified silica nanoparticles acting as emulsion-stabilizers, we depict the possibility of tuning independently the macroscopic cell diameters and the cell junctions via Pickering emulsions employed as templates, leading to the Si(PHIPE) series presenting both monodiperse macroscopic void and cell junction diameters. Finally taking the synergetic effect of nonionic surfactants and a kosmotrope salt effect we show that it is possible generating self-standing Si(HIPE) bearing high organized mesoporosity while addressing the SBA-15-Si(HIPE) series.

Taking inspiration from diatom hierarchically organized porosity, synthetic porous self-standing silica foams have been obtained through rational designs where sol–gel chemistry, emulsions, Pickering-based emulsions and lyotropic mesophases are advantageously combined.

Highlights

  • Lyotropic mesophases, direct emulsions and sol–gel chemistry can be integrated toward the generation of self-standing foams where the macroscopic voids can be tuned while varying the starting emulsion volume fraction, addressing thereby the Si(HIPE) series.

  • Pickering-based emulsions can be employed to shape macrocellular foams bearing high monodisperse character of both macroscopic cells and cell junction diameters, each feature being tunable independently, generating thus the Si(PHIPE) series.

  • P123 nonionic surfactant, (NH4)2SO4 salt and direct emulsion are combined to generate self-standing monolith foams bearing a very high organization of the voids at the mesoscopic length, leading to the SBA-15-Si(HIPE) series.

  • Kosmotrope-Chaotrope balance is introduced in sol–gel chemistry as a tool to enhance silica polycondensation, beyond and additionally to the well-known salt screening and ionic strength effects.

Keywords

Sol-gel process Emulsions Pickering emulsions Lyotropic mesophases Porous matter Integrative chemistry 

Notes

Acknowledgements

The work was financed by the ANR project n°ANR-15-CE07-0023: « Intensified & Sustainable Enzymatic Acylation Processes on Innovative Macroporous/Mesoporous Materials ».

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

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© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  1. 1.CRPP-UMR CNRS 5031, Université de BordeauxPessacFrance
  2. 2.Institut Jean Barriol, Laboratoire Lorrain de Chimie Moléculaire UMR CNRS 7053 L2CM, Université de Lorraine, Faculté des sciences et technologies, BP 70239Vandoeuvre lès Nancy cedexFrance
  3. 3.Department of Civil and Environmental EngineeringMassachusetts Institute of TechnologyCambridgeUSA

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