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58. Effect of Dipole Interactions on Blocking Temperature and Relaxation Dynamics of Superparamagnetic Iron-Oxide (Fe 3 O 4) Nanoparticle Systems.

Author

Sadat, Md Ehsan, Bud'ko, Sergey L., Ewing, Rodney C., Xu, Hong, Pauletti, Giovanni M., Mast, David B., and Shi, Donglu

Subjects
IRON oxides, DIPOLE interactions, NANOPARTICLES, MAGNETIC nanoparticle hyperthermia, MAGNETIC nanoparticles, DIPOLE-dipole interactions, SUPERPARAMAGNETIC materials, MAGNETIC dipoles
Abstract

The effects of dipole interactions on magnetic nanoparticle magnetization and relaxation dynamics were investigated using five nanoparticle (NP) systems with different surfactants, carrier liquids, size distributions, inter-particle spacing, and NP confinement. Dipole interactions were found to play a crucial role in modifying the blocking temperature behavior of the superparamagnetic nanoparticles, where stronger interactions were found to increase the blocking temperatures. Consequently, the blocking temperature of a densely packed nanoparticle system with stronger dipolar interactions was found to be substantially higher than those of the discrete nanoparticle systems. The frequencies of the dominant relaxation mechanisms were determined by magnetic susceptibility measurements in the frequency range of 100 Hz–7 GHz. The loss mechanisms were identified in terms of Brownian relaxation (1 kHz–10 kHz) and gyromagnetic resonance of Fe3O4 (~1.12 GHz). It was observed that the microwave absorption of the Fe3O4 nanoparticles depend on the local environment surrounding the NPs, as well as the long-range dipole–dipole interactions. These significant findings will be profoundly important in magnetic hyperthermia medical therapeutics and energy applications. [ABSTRACT FROM AUTHOR]

Published
2023
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62. Preface

Author

Shi, Donglu, primary, Guo, Zizheng, additional, and Bedford, Nicholas, additional

Published
2015
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83. Photonically-activated molecular excitations for thermal energy conversion in porphyrinic compounds

Author

Zhao, Yuan, Lin, Jou, Kundrat, David M., Bonmarin, Mathias, Krupczak, John, Thomas, Som V., Lyu, Mengyao, Shi, Donglu, Zhao, Yuan, Lin, Jou, Kundrat, David M., Bonmarin, Mathias, Krupczak, John, Thomas, Som V., Lyu, Mengyao, and Shi, Donglu

Abstract

This document is the Accepted Manuscript version of a Published Work that appeared in final form in the Journal of Physical Chemistry C, copyright ©American Chemical Society after peer review and technical editing by the publisher., Heterocyclic, macrocycle organic compounds, structurally characterized with porphyrins, are not only abundant in nature but also environmentally friendly. These porphyrinic compounds have recently been extensively studied for their fascinating structures, physical properties, and high potentials in engineering applications. We report experimental results on the photonically activated thermal energy conversion via irradiations of white light (simulated solar light). The photothermal effects have been well studied for metallic conductors with a large number of charge carriers based on the so-called localized surface plasmon resonance (LSPR). However, the LSPR model may not apply to the porphyrinic materials with a very limited number of charge carriers. In this study, we have found several porphyrinic compounds to exhibit pronounced photothermal effects including chlorophyll, chlorophyllin, hemoglobin, and phthalocyanine, which all share similar structural characteristics. Raman data show characteristic molecular vibrations from these compounds that are responsible for photon-to-thermal energy conversions near the optical absorption frequencies. We attribute the porphyrin molecular vibrations to the photothermal effects observed from these compounds and predict that all porphyrinic materials can be optically activated for pronounced photothermal effects. Also established is a newly defined specific photothermal coefficient (SPC), a unique photothermal property of the thin films investigated in this study.

Published
2020

100. Nanoparticle Delivery of Proangiogenic Transcription Factors into the Neonatal Circulation Inhibits Alveolar Simplification Caused by Hyperoxia

Author

Bolte, Craig, primary, Ustiyan, Vladimir, additional, Ren, Xiaomeng, additional, Dunn, Andrew W., additional, Pradhan, Arun, additional, Wang, Guolun, additional, Kolesnichenko, Olena A., additional, Deng, Zicheng, additional, Zhang, Yufang, additional, Shi, Donglu, additional, Greenberg, James M., additional, Jobe, Alan H., additional, Kalin, Tanya V., additional, and Kalinichenko, Vladimir V., additional

Published
2020
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