Morphology control of mesoporous silica-carbon nanocomposites via phase separation of poly(furfuryl alcohol) and silica in the sol–gel synthesis

Kun Wang, Huanting Wang, Yibing Cheng

Research output: Contribution to journalArticleResearchpeer-review

Abstract

Abstract: Due to the different rates of silica alkoxide hydrolysis and furfuryl alcohol polymerization, hydrophobic poly(furfuryl alcohol) network became incompatible with hydrophilic silica network, PFA-rich spheres were formed in the sol–gel process. The presence of the amphiphilic triblock copolymers P123 could help reduce the degree of phase separation. Slower drying rate, higher aging temperature, and higher C/SiO2 ratio accelerated the polymerization of FA and tend to aggregate more PFA spherical domains. However, in the sample with a fast increased viscosity, the temperature effect would be small since the PFA is hard to agglomerate, leading a homogenous mesoporous structure. If the C/SiO2 ratio is quite high to get a more hydrophobic system, there will be no phase separation too. The understanding of the phase separation of poly-furfuryl alcohol-silica systems offers great opportunities in controlling of the mesoporous carbon-silica nanocomposites. Graphical Abstract: Schematic diagrams of the formation of PFA/silica hybrids: during the sol–gel process, once an alkoxide molecule is hydrolyzed, the resulting hydroxy groups make the molecule more polar, which are more hydrophilic. At the same time, FA polymerized to form PFA oligomers, which are hydrophobic. The incompatibility between these two precursors could be reduced by the amphiphilic triblock copolymers P123, because the long PEO chains are hydrophilic while the PPO block is hydrophobic. Either homogenous or phase separated PFA/silica/P123 can be obtained by tailoring the chemical ratio and the sol–gel process parameters. [InlineMediaObject not available: see fulltext.]

Original languageEnglish
Pages (from-to)664-674
Number of pages11
JournalJournal of Sol-Gel Science and Technology
Volume82
Issue number3
DOIs
Publication statusPublished - 1 Jun 2017

Keywords

  • Mesoporous carbon-silica
  • Organic-inorganic hybrid nanocomposites
  • Phase separation
  • Sol-Gel process

Cite this

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title = "Morphology control of mesoporous silica-carbon nanocomposites via phase separation of poly(furfuryl alcohol) and silica in the sol–gel synthesis",
abstract = "Abstract: Due to the different rates of silica alkoxide hydrolysis and furfuryl alcohol polymerization, hydrophobic poly(furfuryl alcohol) network became incompatible with hydrophilic silica network, PFA-rich spheres were formed in the sol–gel process. The presence of the amphiphilic triblock copolymers P123 could help reduce the degree of phase separation. Slower drying rate, higher aging temperature, and higher C/SiO2 ratio accelerated the polymerization of FA and tend to aggregate more PFA spherical domains. However, in the sample with a fast increased viscosity, the temperature effect would be small since the PFA is hard to agglomerate, leading a homogenous mesoporous structure. If the C/SiO2 ratio is quite high to get a more hydrophobic system, there will be no phase separation too. The understanding of the phase separation of poly-furfuryl alcohol-silica systems offers great opportunities in controlling of the mesoporous carbon-silica nanocomposites. Graphical Abstract: Schematic diagrams of the formation of PFA/silica hybrids: during the sol–gel process, once an alkoxide molecule is hydrolyzed, the resulting hydroxy groups make the molecule more polar, which are more hydrophilic. At the same time, FA polymerized to form PFA oligomers, which are hydrophobic. The incompatibility between these two precursors could be reduced by the amphiphilic triblock copolymers P123, because the long PEO chains are hydrophilic while the PPO block is hydrophobic. Either homogenous or phase separated PFA/silica/P123 can be obtained by tailoring the chemical ratio and the sol–gel process parameters. [InlineMediaObject not available: see fulltext.]",
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Morphology control of mesoporous silica-carbon nanocomposites via phase separation of poly(furfuryl alcohol) and silica in the sol–gel synthesis. / Wang, Kun; Wang, Huanting; Cheng, Yibing.

In: Journal of Sol-Gel Science and Technology, Vol. 82, No. 3, 01.06.2017, p. 664-674.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - Morphology control of mesoporous silica-carbon nanocomposites via phase separation of poly(furfuryl alcohol) and silica in the sol–gel synthesis

AU - Wang, Kun

AU - Wang, Huanting

AU - Cheng, Yibing

PY - 2017/6/1

Y1 - 2017/6/1

N2 - Abstract: Due to the different rates of silica alkoxide hydrolysis and furfuryl alcohol polymerization, hydrophobic poly(furfuryl alcohol) network became incompatible with hydrophilic silica network, PFA-rich spheres were formed in the sol–gel process. The presence of the amphiphilic triblock copolymers P123 could help reduce the degree of phase separation. Slower drying rate, higher aging temperature, and higher C/SiO2 ratio accelerated the polymerization of FA and tend to aggregate more PFA spherical domains. However, in the sample with a fast increased viscosity, the temperature effect would be small since the PFA is hard to agglomerate, leading a homogenous mesoporous structure. If the C/SiO2 ratio is quite high to get a more hydrophobic system, there will be no phase separation too. The understanding of the phase separation of poly-furfuryl alcohol-silica systems offers great opportunities in controlling of the mesoporous carbon-silica nanocomposites. Graphical Abstract: Schematic diagrams of the formation of PFA/silica hybrids: during the sol–gel process, once an alkoxide molecule is hydrolyzed, the resulting hydroxy groups make the molecule more polar, which are more hydrophilic. At the same time, FA polymerized to form PFA oligomers, which are hydrophobic. The incompatibility between these two precursors could be reduced by the amphiphilic triblock copolymers P123, because the long PEO chains are hydrophilic while the PPO block is hydrophobic. Either homogenous or phase separated PFA/silica/P123 can be obtained by tailoring the chemical ratio and the sol–gel process parameters. [InlineMediaObject not available: see fulltext.]

AB - Abstract: Due to the different rates of silica alkoxide hydrolysis and furfuryl alcohol polymerization, hydrophobic poly(furfuryl alcohol) network became incompatible with hydrophilic silica network, PFA-rich spheres were formed in the sol–gel process. The presence of the amphiphilic triblock copolymers P123 could help reduce the degree of phase separation. Slower drying rate, higher aging temperature, and higher C/SiO2 ratio accelerated the polymerization of FA and tend to aggregate more PFA spherical domains. However, in the sample with a fast increased viscosity, the temperature effect would be small since the PFA is hard to agglomerate, leading a homogenous mesoporous structure. If the C/SiO2 ratio is quite high to get a more hydrophobic system, there will be no phase separation too. The understanding of the phase separation of poly-furfuryl alcohol-silica systems offers great opportunities in controlling of the mesoporous carbon-silica nanocomposites. Graphical Abstract: Schematic diagrams of the formation of PFA/silica hybrids: during the sol–gel process, once an alkoxide molecule is hydrolyzed, the resulting hydroxy groups make the molecule more polar, which are more hydrophilic. At the same time, FA polymerized to form PFA oligomers, which are hydrophobic. The incompatibility between these two precursors could be reduced by the amphiphilic triblock copolymers P123, because the long PEO chains are hydrophilic while the PPO block is hydrophobic. Either homogenous or phase separated PFA/silica/P123 can be obtained by tailoring the chemical ratio and the sol–gel process parameters. [InlineMediaObject not available: see fulltext.]

KW - Mesoporous carbon-silica

KW - Organic-inorganic hybrid nanocomposites

KW - Phase separation

KW - Sol-Gel process

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U2 - 10.1007/s10971-017-4358-3

DO - 10.1007/s10971-017-4358-3

M3 - Article

VL - 82

SP - 664

EP - 674

JO - Journal of Sol-Gel Science and Technology

JF - Journal of Sol-Gel Science and Technology

SN - 0928-0707

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