Hierarchically Structured Porous Spinels via an Epoxide-Mediated Sol–Gel Process Accompanied by Polymerization-Induced Phase Separation

Organic-inorganic hybrid monoliths with well-defined macropores and/or mesopores have been synthesized by a sol-gel process accompanied by polymerization-induced phase separation. Using aklyltrialkoxysilanes and alkylene-bridged alkoxysilanes, two different categories of organo-siloxane networks have been characterized in view of macroporoisity based on phase separation as well as mesoporosity based on supramolecular templating by surfactants. The alkyl-terminated polysiloxane network exhibited substantial surface hydrophobicity together with the mechanical flexibility. On the other hand, the alkylene-bridged network behaved much more similarly to those prepared from tetraalkoxysilanes with regard to surface hydrophilicity, mechanical rigidness and mesopore-forming ability. Supramolecular templating of mesopores embedded in the gel skeletons comprising well-defined macroporous network has proven to give wide variety of hierarchically designed macro-mesoporous organic-inorganic hybrid materials.

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Preparation of Macroprous C12A7 Mayenite Monoliths via a Sol-Gel Process with Nitrates as Precursors

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.768.211 ◽

2018 ◽

Vol 768 ◽

pp. 211-217 ◽

Cited By ~ 1

Author(s):

Rui Wang ◽

Yu Kun Sun ◽

Bao Jia Qi Jiang ◽

Hui Yang ◽

Xing Zhong Guo

Keyword(s):

Heat Treatment ◽

Phase Separation ◽

Binary System ◽

Propylene Oxide ◽

Crystalline Phase ◽

Sol Gel ◽

Single Crystalline ◽

Sol Gel Process

Macroporous Ca12Al14O33(C12A7) mayenite monoliths have been successfully prepared via a sol-gel process in the presence of propylene oxide (PO) and poly (ethyleneoxide) (PEO). Gelation of CaO-Al2O3binary system with nitrates salts as additional precursors is accelerated by PO as an acid scavenger, while PEO works as a phase separation inducer to mediate the phase separation of the system. Appropriate PO and PEO amounts allow the formation of monolithic xerogel with interconnected macropores and co-continuous skeletons. The resultant dried gels are amorphous and the single crystalline phase Ca12Al14O33mayenite forms after heat-treatment at 1100 °C in air, while the macrostructure is preserved with a porosity as high as 78% and smoother and denser skeletons.

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Preparation of macroporous Li2ZrO3 monoliths via an epoxide-mediated sol–gel process accompanied by phase separation

Journal of Porous Materials ◽

10.1007/s10934-017-0373-6 ◽

2017 ◽

Vol 24 (5) ◽

pp. 1319-1326 ◽

Cited By ~ 1

Author(s):

Xingzhong Guo ◽

Li Ding ◽

Jing Ren ◽

Hui Yang

Keyword(s):

Phase Separation ◽

Sol Gel ◽

Sol Gel Process

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Iron(iii) oxyhydroxide and oxide monoliths with controlled multiscale porosity: synthesis and their adsorption performance

Journal of Materials Chemistry A ◽

10.1039/c8ta01691g ◽

2018 ◽

Vol 6 (19) ◽

pp. 9041-9048 ◽

Cited By ~ 10

Author(s):

Yosuke Hara ◽

Kazuyoshi Kanamori ◽

Kei Morisato ◽

Riichi Miyamoto ◽

Kazuki Nakanishi

Keyword(s):

Phase Separation ◽

Sol Gel ◽

Adsorption Performance ◽

Sol Gel Process

Iron(iii) oxyhydroxide and oxide monoliths with controlled multiscale porosity have been successfully fabricated via the sol–gel process accompanied by phase separation.

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Synthesis of hierarchically porous MnO/C composites via a sol–gel process followed by two-step combustion for lithium-ion batteries

New Journal of Chemistry ◽

10.1039/d0nj01538e ◽

2020 ◽

Vol 44 (28) ◽

pp. 12307-12316

Author(s):

Wei Liu ◽

Daoyan Feng ◽

Hui Yang ◽

Xingzhong Guo

Keyword(s):

Phase Separation ◽

Lithium Ion Batteries ◽

Sol Gel ◽

Lithium Ion ◽

Hierarchically Porous ◽

Sol Gel Process

Hierarchically porous MnO/C composites with interconnected macropores and co-continuous skeletons were fabricated via a sol–gel process combined with phase separation, followed by a two-step combustion.

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