Chain Formation of PNIPAM-Coated Magnetic Nanoparticles in an External Magnetic Field and the Effect of Temperature

Nurul Izza Taib, Robert C. Woodward, Timothy G.St Pierre, K. Swaminathan Iyer

Research output: Contribution to journalArticlepeer-review

Abstract

In this study, we demonstrate that the length and distribution of the aggregates were dependent on the temperature of the aqueous solution of poly( N -isopropylacrylamide) (PNIPAM). Magnetic resonance relaxometry, transmission electron microscopy (TEM), and scanning electron microscopy (SEM) were used to observe the chaining of magnetic polymer nanoparticles (NPs) on a micrometer scale under a 0.3T magnetic field. As the temperature increased, the magnetic interparticle interactions increased, therefore increasing the chain formation. By utilizing the temperature-mediated lower critical solution temperature (LCST) of PNIPAM from hydrophilic to hydrophobic at 45 °C, multiple-thick-chain-like structures can be obtained.

Original languageEnglish
JournalIEEE Transactions on Magnetics
Volume58
Issue number2
DOIs
Publication statusPublished - 1 Feb 2022

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