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Title: | In situ SAXS observation on metal-salt-derived alumina sol-gel system accompanied by phase separation. |
Authors: | Tokudome, Yasuaki Nakanishi, Kazuki https://orcid.org/0000-0002-8069-4780 (unconfirmed) Kanamori, Kazuyoshi https://orcid.org/0000-0001-5087-9808 (unconfirmed) Hanada, Teiichi |
Author's alias: | 中西, 和樹 |
Keywords: | SAXS Alumina Macroporous Mesoporous Phase separation Monolith Sol–gel |
Issue Date: | 15-Dec-2010 |
Publisher: | Elsevier Inc. |
Journal title: | Journal of colloid and interface science |
Volume: | 352 |
Issue: | 2 |
Start page: | 303 |
End page: | 308 |
Abstract: | The structure formation process of hierarchically porous alumina gels has been investigated by in situ small angle X-ray scattering (SAXS). The measurement was performed on the sol-gel solution containing aluminum chloride hexahydrate (AlCl(3)·6H(2)O), poly(ethylene oxide) (PEO), and propylene oxide (PO). The temporal divergence of scattering intensity in the low q regime was observed in the early stage of reaction, indicating that the occurrence of spinodal-decomposition-type phase separation. Detailed analysis of the SAXS profiles revealed that phase separation occurs between weakly branched polymerizing aluminum hydroxide (AH) and PEO. Further progress of the condensation reaction forms phase-separated two phases, that is, AH-rich phase and PEO-rich phase with the micrometer-range heterogeneity. The growth and aggregation of primary particles occurs in the phase-separated AH-rich domain, and therefore, the addition of PEO influences on the structure in nanometer regime as well as micrometer regime. The moderate stability of oligomeric species allows homogeneous condensation reaction parallel to phase separation and successful formation of hierarchically porous alumina gel. |
Rights: | © 2010 Elsevier Inc. この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。 This is not the published version. Please cite only the published version. |
URI: | http://hdl.handle.net/2433/131802 |
DOI(Published Version): | 10.1016/j.jcis.2010.08.041 |
PubMed ID: | 20822775 |
Appears in Collections: | Journal Articles |
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