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Electrolytic conductivity-related radiofrequency heating of aqueous suspensions of nanoparticles for biomedicine.
Phys. Chem. Chem. Phys. 19, 11510-11517 (2017)
Publ. Version/Full Text
Research data
DOI
PMC
The development of suitable contrast agents can significantly enhance the efficiency of modern imaging and treatment techniques, such as thermoacoustic (TA) tomography and radio-frequency (RF) hyperthermia of cancer. Here, we examine the heating of aqueous suspensions of silicon (Si) and gold (Au) nanoparticles (NPs) under RF irradiation in the MHz frequency range. The heating rate of aqueous suspensions of Si NPs exhibited non-monotonic dependency on the electrical conductivity of the suspension. The experimental results were explained by the mathematical model considering oscillating solvated ions as the main source of Joule heating. These ions could be the product of the dissolution of Si NPs or organic coating of Au NPs. Thus, the ions governed the conductivity of the suspensions, which in turn governs both the heating rate and the near-field RF TA response. The model predicted the contrast in different tissues taking into account both Joule heating and dielectric losses.
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Publication type
Article: Journal article
Document type
Scientific Article
Keywords
Gold Nanoparticles; Porous Silicon; Tumor Ablation; Cancer-therapy; Thermoacoustic Tomography; Laser-ablation; Water; Contrast; Field; Size
ISSN (print) / ISBN
0956-5000
e-ISSN
1364-5455
Quellenangaben
Volume: 19,
Issue: 18,
Pages: 11510-11517
Publisher
Royal Society of Chemistry (RSC)
Publishing Place
Cambridge
Non-patent literature
Publications
Reviewing status
Peer reviewed
Institute(s)
Institute of Biological and Medical Imaging (IBMI)