Iron oxide nanoparticles decorated oleic acid for high colloidal stability

Lai, Chin Wei and Low, Foo Wah and Tai, Mun Foong and Hamid, Sharifah Bee Abd (2017) Iron oxide nanoparticles decorated oleic acid for high colloidal stability. Advances in Polymer Technology, 37 (6). pp. 1712-1721. ISSN 0730-6679, DOI

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In the present study, oleic acid (OA)-decorated magnetite nanoparticles (MNPs) were synthesized via in situ co-precipitation method using ammonium hydroxide as a precipitating agent. This study aims to determine the optimum loading amount of OA for improving the MNPs colloidal stability. Based on our results obtained, it was found that the zeta potential values of MNPs increased from −29.8 to −58.1 mV after modification of MNPs with 1.2 wt.% of OA. Indeed, results obtained clearly to show that a maximum colloidal stability of MNPs in a basic medium could be significantly improved. As a result, this resultant colloidal suspension performance was approximately 7 times higher (21 days- high colloidal stability against precipitation and agglomeration) than that of the undecorated MNPs sample (3 days). Based on vibrating sample magnetometer (VSM) analysis, the resultant OA-decorated MNPs exhibited superparamagnetic behavior with slightly lower saturation magnetization (51–69 emu/g) than that of undecorated MNPs sample (80 emu/g) at room temperature. This behavior was attributed to the sufficient carboxylate ions from the outer layer of the bilayer of OA-decorated MNPs, which promoted the high colloidal stability performance.

Item Type: Article
Funders: University of Malaya: Fundamental Research Grant Scheme (FP008-2015A), Grand Challenge Grant (GC002A-15SBS), University Malaya Research Fund Assistance (BK096-2016), and University of Malaya Postgraduate Research Grant (PG068-2014B) and PG061-2014B
Uncontrolled Keywords: colloidal stabsility; magnetite nanoparticles; oleic acid; superparamagnetic
Subjects: Q Science > Q Science (General)
Q Science > QD Chemistry
Divisions: Deputy Vice Chancellor (Research & Innovation) Office > Nanotechnology & Catalysis Research Centre
Depositing User: Ms. Juhaida Abd Rahim
Date Deposited: 27 Jun 2019 03:46
Last Modified: 27 Jun 2019 03:46

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