Photonic Reactions Leading to Fluorescence in a Polymeric System Induced by the Photothermal Effect of Magnetite Nanoparticles Using a 780 nm Multiphoton Laser

Recently, polymer‐coated magnetite (Fe3O4) nanoparticles (NPs) are extensively studied for applications in therapeutics or diagnostics using photothermal effect. Therefore, it is essential to understand the interactions between Fe3O4 NPs and polymers when optical stimuli are applied. Herein, the pho...

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Bibliographic Details
Published in:Small (Weinheim an der Bergstrasse, Germany) Germany), 2017-10, Vol.13 (37), p.n/a
Main Authors: Park, Bum Chul, Kim, Hee‐Dae, Park, June, Kim, Yu Jin, Kim, Young Keun
Format: Article
Language:English
Subjects:
Addition polymerization
Aliphatic compounds
Biomolecules
Fe3O4 nanoparticles
Fluorescence
interactions
Iron oxides
Lasers
Light emission
Magnetite
Nanoparticles
Nanotechnology
Phase transitions
Photonics
photothermal effect
Polymer coatings
Polymer matrix composites
Polymers
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Summary:Recently, polymer‐coated magnetite (Fe3O4) nanoparticles (NPs) are extensively studied for applications in therapeutics or diagnostics using photothermal effect. Therefore, it is essential to understand the interactions between Fe3O4 NPs and polymers when optical stimuli are applied. Herein, the photonic reactions of Fe3O4 NPs and polymer composites upon application of a 780 nm multiphoton laser are analyzed. The photonic reactions produce unique results including fluorescence from conformationally changed polymer and low‐temperature phase transformation of Fe3O4 NPs. Typically, π‐conjugated chains are formed, inducing fluorescence through a series of main and side‐chain cleavage reactions of polymers with the aliphatic chain. In addition, fluorescence is detected in the cellular system by photonic reactions between Fe3O4 NPs and biomolecules. After multiphoton laser irradiation, light emission is detected near the intracellular Fe3O4 NPs, and a stronger intensity is observed in large‐sized NPs. An interaction between Fe3O4 nanoparticles and polymeric molecules under multiphoton laser irradiation causes photothermal effect on Fe3O4 NPs. Conformationally changed polymers give rise to fluorescence and phase transformation of Fe3O4 to FeO occurs. The photonic reactions in magnetic‐polymer composites can be applied as photothermal reagents in cellular therapy and imaging.
ISSN:1613-6810
1613-6829
DOI:10.1002/smll.201700897