Mechanisms of highly stabilized ex-situ oleic acid-modified iron oxide nanoparticles functionalized with 4-pentynoic acid
In this paper, the main objective is to successfully functionalize 4-pentynoic acid on iron oxide nanoparticles (NPs) which arises second objective; to ex-situ modify different concentrations of oleic acid on the NPs. A new understanding has been achieved as to how the concentrations of oleic acid p...
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| Format: | Article |
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Elsevier
2018
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| author | Baharuddin, Aainaa Aqilah Ang, Bee Chin Abu Hussein, Nurul Athirah Andriyana, Andri Wong, Yew Hoong |
| author_facet | Baharuddin, Aainaa Aqilah Ang, Bee Chin Abu Hussein, Nurul Athirah Andriyana, Andri Wong, Yew Hoong |
| author_sort | Baharuddin, Aainaa Aqilah |
| collection | UM |
| description | In this paper, the main objective is to successfully functionalize 4-pentynoic acid on iron oxide nanoparticles (NPs) which arises second objective; to ex-situ modify different concentrations of oleic acid on the NPs. A new understanding has been achieved as to how the concentrations of oleic acid prior ex-situ modification, play a major role in the successful functionalization of 4-pentynoic acid on the NPs. The functionalization proposed is a potential alternative route of creating an acid anhydride from two carboxylic acids without the use of dehydrating agent. Unmodified NPs were synthesized by co-precipitation method and were altered to pH 12 using NH4OH to promote dispersity right before ex-situ modification with oleic acid (0.2–0.8 wt % oleic acid to iron oxide) and subsequent 4-pentynoic acid (1.63 × 10−3 mol) functionalization. Characterizations were conducted by X-ray-diffraction (XRD), Transmission Electron Microscopy (TEM), Thermogravimetric and Differential Thermal analysis (TGA-DTA), Fourier transform infrared spectroscopy (FTIR), proton nucleic magnetic resonance (NMR) and Zetasizer. A monolayer oleic acid is produced for ex-situ modification of 0.2 wt % oleic acid to iron oxide. Whereas the higher concentrations of oleic acid ex-situ modifications generate bilayer oleic acid-modified iron oxide NPs to which, functionalization of 4-pentynoic acid is only successfully performed. The samples pose highly stabilized dispersions at pH 12 varying between -42 and -75 mV, whereas the mean hydrodynamic particle size distributions are achieved at approximately 35–48 nm. Mechanisms of ex-situ modifications of different oleic acid concentrations and functionalization of 4-pentynoic acid on the iron oxide NPs at pH 12 and 333.15 K are also proposed. |
| first_indexed | 2024-03-06T05:56:46Z |
| format | Article |
| id | um.eprints-22372 |
| institution | Universiti Malaya |
| last_indexed | 2024-03-06T05:56:46Z |
| publishDate | 2018 |
| publisher | Elsevier |
| record_format | dspace |
| spelling | um.eprints-223722019-09-17T06:08:11Z http://eprints.um.edu.my/22372/ Mechanisms of highly stabilized ex-situ oleic acid-modified iron oxide nanoparticles functionalized with 4-pentynoic acid Baharuddin, Aainaa Aqilah Ang, Bee Chin Abu Hussein, Nurul Athirah Andriyana, Andri Wong, Yew Hoong TJ Mechanical engineering and machinery TP Chemical technology In this paper, the main objective is to successfully functionalize 4-pentynoic acid on iron oxide nanoparticles (NPs) which arises second objective; to ex-situ modify different concentrations of oleic acid on the NPs. A new understanding has been achieved as to how the concentrations of oleic acid prior ex-situ modification, play a major role in the successful functionalization of 4-pentynoic acid on the NPs. The functionalization proposed is a potential alternative route of creating an acid anhydride from two carboxylic acids without the use of dehydrating agent. Unmodified NPs were synthesized by co-precipitation method and were altered to pH 12 using NH4OH to promote dispersity right before ex-situ modification with oleic acid (0.2–0.8 wt % oleic acid to iron oxide) and subsequent 4-pentynoic acid (1.63 × 10−3 mol) functionalization. Characterizations were conducted by X-ray-diffraction (XRD), Transmission Electron Microscopy (TEM), Thermogravimetric and Differential Thermal analysis (TGA-DTA), Fourier transform infrared spectroscopy (FTIR), proton nucleic magnetic resonance (NMR) and Zetasizer. A monolayer oleic acid is produced for ex-situ modification of 0.2 wt % oleic acid to iron oxide. Whereas the higher concentrations of oleic acid ex-situ modifications generate bilayer oleic acid-modified iron oxide NPs to which, functionalization of 4-pentynoic acid is only successfully performed. The samples pose highly stabilized dispersions at pH 12 varying between -42 and -75 mV, whereas the mean hydrodynamic particle size distributions are achieved at approximately 35–48 nm. Mechanisms of ex-situ modifications of different oleic acid concentrations and functionalization of 4-pentynoic acid on the iron oxide NPs at pH 12 and 333.15 K are also proposed. Elsevier 2018 Article PeerReviewed Baharuddin, Aainaa Aqilah and Ang, Bee Chin and Abu Hussein, Nurul Athirah and Andriyana, Andri and Wong, Yew Hoong (2018) Mechanisms of highly stabilized ex-situ oleic acid-modified iron oxide nanoparticles functionalized with 4-pentynoic acid. Materials Chemistry and Physics, 203. pp. 212-222. ISSN 0254-0584, DOI https://doi.org/10.1016/j.matchemphys.2017.09.051 <https://doi.org/10.1016/j.matchemphys.2017.09.051>. https://doi.org/10.1016/j.matchemphys.2017.09.051 doi:10.1016/j.matchemphys.2017.09.051 |
| spellingShingle | TJ Mechanical engineering and machinery TP Chemical technology Baharuddin, Aainaa Aqilah Ang, Bee Chin Abu Hussein, Nurul Athirah Andriyana, Andri Wong, Yew Hoong Mechanisms of highly stabilized ex-situ oleic acid-modified iron oxide nanoparticles functionalized with 4-pentynoic acid |
| title | Mechanisms of highly stabilized ex-situ oleic acid-modified iron oxide nanoparticles functionalized with 4-pentynoic acid |
| title_full | Mechanisms of highly stabilized ex-situ oleic acid-modified iron oxide nanoparticles functionalized with 4-pentynoic acid |
| title_fullStr | Mechanisms of highly stabilized ex-situ oleic acid-modified iron oxide nanoparticles functionalized with 4-pentynoic acid |
| title_full_unstemmed | Mechanisms of highly stabilized ex-situ oleic acid-modified iron oxide nanoparticles functionalized with 4-pentynoic acid |
| title_short | Mechanisms of highly stabilized ex-situ oleic acid-modified iron oxide nanoparticles functionalized with 4-pentynoic acid |
| title_sort | mechanisms of highly stabilized ex situ oleic acid modified iron oxide nanoparticles functionalized with 4 pentynoic acid |
| topic | TJ Mechanical engineering and machinery TP Chemical technology |
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