Stimuli-responsive Fe3O4 Nanoparticle Modified by Conjugated Linoleic Acid

doi:10.7503/cjcu20200309

Abstract

Abstract:

The surface of Fe₃O₄ nanoparticles was modified by small dosage of the natural unsaturated fatty acid， conjugated linoleic acid（CLA）， instead of oleic acid to prevent the nanoparticles from secondary agglo-meration， oxidization and thus loss of magnetism， and to further improve thermal instability of the modified fatty acid layer. The stability of the modified layer was enhanced by means of self-crosslinking of conjugated double bond of CLA molecules， by which the modified particles could be responsive to the pH stimulus besides the magnetic stimulus. The size and morphology of the modified Fe₃O₄ NPs was imaged by TEM， the coordinationmodes by ATR-FTIR， the dosage of CLA by TG， the surface wettability by θ angle analysis， moreover the droplet size and size distribution of Pickering emulsion stabilized by the modified particles were photographed by large-depth-of-field microscope. The experimental results indicated that the modified particles are well- dispersed relying on a thin and stable， hydrophobic surface showing obvious dual pH/magnetic responsiveness. Pickering emulsion could be stabilized by small dosage of the modified particles（mass fraction 0.05%） and shown the emulsion characteristics of high internal oil phase（oil volume fraction 80%）， switchable by a pH trigger， and migratable in an external magnetic field. A simulation experiment shows that the emulsion can effectively extract and separate organic pollutant in the aqueous phase.

Key words: Conjugated linoleic acid, Fe₃O₄ nanoparticles, Surface modification, Stimuli-responsive, Picke-ring emulsion

CLC Number:

O648

TrendMD:

ZHANG Xinyu, WANG Hong, FANG Yun, FAN Ye. Stimuli-responsive Fe₃O₄ Nanoparticle Modified by Conjugated Linoleic Acid[J]. Chem. J. Chinese Universities, 2020, 41(11): 2519.

Figures/Tables 5

References 26

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Stimuli-responsive Fe₃O₄ Nanoparticle Modified by Conjugated Linoleic Acid

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