File Download

There are no files associated with this item.

  Links for fulltext
     (May Require Subscription)
Supplementary

Article: Spontaneous formation of nano-fibrillar boehmite and the enhancement effect of polyethylene glycol

TitleSpontaneous formation of nano-fibrillar boehmite and the enhancement effect of polyethylene glycol
Authors
KeywordsAcidic PH
Aluminum ions
Aluminum nitrate
Aluminum sulfates
Crystal nuclei
Issue Date2011
PublisherBlackwell Publishing, Inc. The Journal's web site is located at http://www.ceramicjournal.org
Citation
Journal of the American Ceramic Society, 2011, v. 94 n. 12, p. 4435-4443 How to Cite?
AbstractNano-fibrillar boehmite is a desirable product due to its high specific surface area and potential application in a wide variety of engineering applications. Inorganic salts are the preferred raw materials for fabricating such products because of their low cost. In this study, nano-sized (10-20 nm in diameter) boehmite fibrils were fabricated by the hydrothermal (105°C) digestion of a suspension prepared from either aluminum sulfate or nitrate salt under a neutral pH. It appears that the formation of fibrils is spontaneous and thermodynamically favorable. The presence of polyethylene glycol (PEG) was found to further enhance the formation of fibrils by promoting the transportation of aluminum ions to the crystal nuclei. The growth direction of the crystals in the fibrils is normal to the boehmite (020) plane. The formation of boehmite fibrils was greatly reduced under an acidic pH and at a lower digestion temperature due to kinetic restriction. The structures of the immediate products generated from aluminum sulfate and aluminum nitrate were different, which is probably due to the stronger adsorption of sulfate ions on the surface of gelatinous aggregates. The fibrils derived from as-precipitated and coagulated amorphous aluminum hydroxide grains experienced a series of structural evolutions in which they progressed from a sponge-like structure to a fibrillar structure with time. © 2011 The American Ceramic Society.
Persistent Identifierhttp://hdl.handle.net/10722/150628
ISSN
2015 Impact Factor: 2.787
2015 SCImago Journal Rankings: 1.045
ISI Accession Number ID
Funding AgencyGrant Number
Research Grants Committee of Hong KongHKU 716809E
Funding Information:

We gratefully acknowledge the funding for this research provided by the General Research Fund Scheme of the Research Grants Committee of Hong Kong (HKU 716809E). The authors are also grateful to Dr. Yanchun Wang and Mr. Changzhong Liao for assisting with the XRD analysis.

References
Grants

 

DC FieldValueLanguage
dc.contributor.authorWang, Xen_HK
dc.contributor.authorLi, XYen_HK
dc.contributor.authorShih, Ken_HK
dc.date.accessioned2012-06-26T06:06:15Z-
dc.date.available2012-06-26T06:06:15Z-
dc.date.issued2011en_HK
dc.identifier.citationJournal of the American Ceramic Society, 2011, v. 94 n. 12, p. 4435-4443en_HK
dc.identifier.issn0002-7820en_HK
dc.identifier.urihttp://hdl.handle.net/10722/150628-
dc.description.abstractNano-fibrillar boehmite is a desirable product due to its high specific surface area and potential application in a wide variety of engineering applications. Inorganic salts are the preferred raw materials for fabricating such products because of their low cost. In this study, nano-sized (10-20 nm in diameter) boehmite fibrils were fabricated by the hydrothermal (105°C) digestion of a suspension prepared from either aluminum sulfate or nitrate salt under a neutral pH. It appears that the formation of fibrils is spontaneous and thermodynamically favorable. The presence of polyethylene glycol (PEG) was found to further enhance the formation of fibrils by promoting the transportation of aluminum ions to the crystal nuclei. The growth direction of the crystals in the fibrils is normal to the boehmite (020) plane. The formation of boehmite fibrils was greatly reduced under an acidic pH and at a lower digestion temperature due to kinetic restriction. The structures of the immediate products generated from aluminum sulfate and aluminum nitrate were different, which is probably due to the stronger adsorption of sulfate ions on the surface of gelatinous aggregates. The fibrils derived from as-precipitated and coagulated amorphous aluminum hydroxide grains experienced a series of structural evolutions in which they progressed from a sponge-like structure to a fibrillar structure with time. © 2011 The American Ceramic Society.en_HK
dc.languageengen_US
dc.publisherBlackwell Publishing, Inc. The Journal's web site is located at http://www.ceramicjournal.orgen_HK
dc.relation.ispartofJournal of the American Ceramic Societyen_HK
dc.rightsThe definitive version is available at www.blackwell-synergy.com-
dc.subjectAcidic PH-
dc.subjectAluminum ions-
dc.subjectAluminum nitrate-
dc.subjectAluminum sulfates-
dc.subjectCrystal nuclei-
dc.titleSpontaneous formation of nano-fibrillar boehmite and the enhancement effect of polyethylene glycolen_HK
dc.typeArticleen_HK
dc.identifier.emailWang, X: wangxm@hku.hken_HK
dc.identifier.emailLi, XY: xlia@hkucc.hku.hken_HK
dc.identifier.emailShih, K: kshih@hku.hken_HK
dc.identifier.authorityWang, X=rp01452en_HK
dc.identifier.authorityLi, XY=rp00222en_HK
dc.identifier.authorityShih, K=rp00167en_HK
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1111/j.1551-2916.2011.04702.xen_HK
dc.identifier.scopuseid_2-s2.0-82955247063en_HK
dc.identifier.hkuros205543-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-82955247063&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume94en_HK
dc.identifier.issue12en_HK
dc.identifier.spage4435en_HK
dc.identifier.epage4443en_HK
dc.identifier.isiWOS:000297848100058-
dc.publisher.placeUnited Statesen_HK
dc.relation.projectSorption of Perfluorochemicals on Sediments and Sludge of Hong Kong-
dc.identifier.scopusauthoridShih, K=14072108900en_HK
dc.identifier.scopusauthoridLi, XY=26642887900en_HK
dc.identifier.scopusauthoridWang, XM=23092524200en_HK

Export via OAI-PMH Interface in XML Formats


OR


Export to Other Non-XML Formats