title: Real-time magnetic nanothermometry: the use of magnetization of magnetic nanoparticles assessed under low frequency triangle-wave magnetic fields.
abstract: In this study, we propose and demonstrate the usefulness of employing time-varying magnetization of a magnetic nanoparticle (MNP) based sample, induced by low frequency (f = 25 Hz) triangular-wave magnetic field, to achieve the approach of real-time recording of magnetization curve, which allows precise and noninvasive temperature probing with real-time performance. Moreover, the present report introduces the design and performed the test of a detection system for accurate and real-time recording of the magnetization curve of MNP-based samples. We found that by employing the magnetization curve of a magnetic fluid sample containing magnetite nanoparticles of about 30 nm in diameter the accuracy of the temperature probing is about 0.32 K (0.1% relative accuracy), with response time of 1 s. Furthermore, an increase in response time from 1 to 8 s improves the accuracy of temperature probing from 0.32 to 0.20 K. Finally, we envisage that breakthroughs in clinical hyperthermia, targeted drug delivery and basic cell research can be accomplished while using the approach reported in this study.
authors.affiliation: School of Automation, Huazhong University of Science and Technology, Wuhan 430074, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Zhong
authors.affiliation: School of Automation, Huazhong University of Science and Technology, Wuhan 430074, China.
authors.forename: Wenzhong
authors.initials: W
authors.lastname: Liu
authors.affiliation: School of Automation, Huazhong University of Science and Technology, Wuhan 430074, China.
authors.forename: Ling
authors.initials: L
authors.lastname: Jiang
authors.affiliation: School of Automation, Huazhong University of Science and Technology, Wuhan 430074, China.
authors.forename: Ming
authors.initials: M
authors.lastname: Yang
authors.affiliation: School of Automation, Huazhong University of Science and Technology, Wuhan 430074, China.
authors.forename: Paulo Cesar
authors.initials: PC
authors.lastname: Morais
mesh_terms: D000465:Algorithms; D060526:Magnetic Fields; D060328:Magnetic Phenomena; D058185:Magnetite Nanoparticles; D062125:Thermometry / Q000379:methods*; D013997:Time Factors
chemical_list: D058185:Magnetite Nanoparticles