Application of the quartz crystal microbalance with dissipation method to a study of oleate adsorption onto a hydroxyapatite surface.
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| Title: | Application of the quartz crystal microbalance with dissipation method to a study of oleate adsorption onto a hydroxyapatite surface. |
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| Authors: | Kou, J.1, Tao, D.2 dtao@engr.uky.edu, Sun, T.3, Xu, G.4 |
| Source: | Minerals & Metallurgical Processing. Feb2012, Vol. 29 Issue 1, p47-55. 9p. |
| Subjects: | Quartz crystal microbalances, Energy dissipation, Oleates, Hydroxyapatite, Chemisorption |
| Abstract: | The adsorption process, density and structural property of the oleate layer adsorbed onto a hydroxyapatite (HAP) surface at six different concentrations and three pHs (pH 8, 9 and 10) have been studied using the technique of quartz crystal microbalance with dissipation (QCM-D). The present study demonstrated the versatility and accuracy of the QCM-D for surface adsorption characterization. The real-time measurements of frequency and dissipation shifts with a hydroxyapatite-coated sensor revealed changes in the hydroxyapatite surface during the entire adsorption process. Chemisorption and surface precipitation of sodium oleate were also observed on the surface of hydroxyapatite through the use of Fourier Transform infrared spectroscopy(FTIR). Chemisorption dominated at low concentrations and high pH values and formed a rigid and thin adsorption layer. Surface precipitation of calcium oleate and micelles dominated at concentrations higher than critical micelle concentration (CMC) and lower pHs and formed a thick but dissipated adsorption layer with a high hydration level. Three distinct adsorption behaviors were identified from the different slopes of ΔD-Δf plots. The adsorption density was less than a monolayer at concentrations <0.164 mM, but increased significantly at concentrations higher than 0.821 mM at all three pHs. The critical concentration at pH 8 was 0.33 mM, which was lower than at pH 9 (0.821 mM) and pH 10 (3.3 mM). [ABSTRACT FROM AUTHOR] |
| Copyright of Minerals & Metallurgical Processing is the property of Society for Mining, Metallurgy, & Exploration, Inc. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.) | |
| Database: | Engineering Source |
| FullText | Links: – Type: pdflink Text: Availability: 0 |
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| Header | DbId: egs DbLabel: Engineering Source An: 80414377 AccessLevel: 6 PubType: Academic Journal PubTypeId: academicJournal PreciseRelevancyScore: 0 |
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| Items | – Name: Title Label: Title Group: Ti Data: Application of the quartz crystal microbalance with dissipation method to a study of oleate adsorption onto a hydroxyapatite surface. – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Kou%2C+J%2E%22">Kou, J.</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Tao%2C+D%2E%22">Tao, D.</searchLink><relatesTo>2</relatesTo><i> dtao@engr.uky.edu</i><br /><searchLink fieldCode="AR" term="%22Sun%2C+T%2E%22">Sun, T.</searchLink><relatesTo>3</relatesTo><br /><searchLink fieldCode="AR" term="%22Xu%2C+G%2E%22">Xu, G.</searchLink><relatesTo>4</relatesTo> – Name: TitleSource Label: Source Group: Src Data: <searchLink fieldCode="JN" term="%22Minerals+%26+Metallurgical+Processing%22">Minerals & Metallurgical Processing</searchLink>. Feb2012, Vol. 29 Issue 1, p47-55. 9p. – Name: Subject Label: Subjects Group: Su Data: <searchLink fieldCode="DE" term="%22Quartz+crystal+microbalances%22">Quartz crystal microbalances</searchLink><br /><searchLink fieldCode="DE" term="%22Energy+dissipation%22">Energy dissipation</searchLink><br /><searchLink fieldCode="DE" term="%22Oleates%22">Oleates</searchLink><br /><searchLink fieldCode="DE" term="%22Hydroxyapatite%22">Hydroxyapatite</searchLink><br /><searchLink fieldCode="DE" term="%22Chemisorption%22">Chemisorption</searchLink> – Name: Abstract Label: Abstract Group: Ab Data: The adsorption process, density and structural property of the oleate layer adsorbed onto a hydroxyapatite (HAP) surface at six different concentrations and three pHs (pH 8, 9 and 10) have been studied using the technique of quartz crystal microbalance with dissipation (QCM-D). The present study demonstrated the versatility and accuracy of the QCM-D for surface adsorption characterization. The real-time measurements of frequency and dissipation shifts with a hydroxyapatite-coated sensor revealed changes in the hydroxyapatite surface during the entire adsorption process. Chemisorption and surface precipitation of sodium oleate were also observed on the surface of hydroxyapatite through the use of Fourier Transform infrared spectroscopy(FTIR). Chemisorption dominated at low concentrations and high pH values and formed a rigid and thin adsorption layer. Surface precipitation of calcium oleate and micelles dominated at concentrations higher than critical micelle concentration (CMC) and lower pHs and formed a thick but dissipated adsorption layer with a high hydration level. Three distinct adsorption behaviors were identified from the different slopes of ΔD-Δf plots. The adsorption density was less than a monolayer at concentrations <0.164 mM, but increased significantly at concentrations higher than 0.821 mM at all three pHs. The critical concentration at pH 8 was 0.33 mM, which was lower than at pH 9 (0.821 mM) and pH 10 (3.3 mM). [ABSTRACT FROM AUTHOR] – Name: AbstractSuppliedCopyright Label: Group: Ab Data: <i>Copyright of Minerals & Metallurgical Processing is the property of Society for Mining, Metallurgy, & Exploration, Inc. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.) |
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| RecordInfo | BibRecord: BibEntity: Languages: – Code: eng Text: English PhysicalDescription: Pagination: PageCount: 9 StartPage: 47 Subjects: – SubjectFull: Quartz crystal microbalances Type: general – SubjectFull: Energy dissipation Type: general – SubjectFull: Oleates Type: general – SubjectFull: Hydroxyapatite Type: general – SubjectFull: Chemisorption Type: general Titles: – TitleFull: Application of the quartz crystal microbalance with dissipation method to a study of oleate adsorption onto a hydroxyapatite surface. Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Kou, J. – PersonEntity: Name: NameFull: Tao, D. – PersonEntity: Name: NameFull: Sun, T. – PersonEntity: Name: NameFull: Xu, G. IsPartOfRelationships: – BibEntity: Dates: – D: 01 M: 02 Text: Feb2012 Type: published Y: 2012 Identifiers: – Type: issn-print Value: 07479182 Numbering: – Type: volume Value: 29 – Type: issue Value: 1 Titles: – TitleFull: Minerals & Metallurgical Processing Type: main |
| ResultId | 1 |
