Radiofrequency electric-field heating behaviors of highly enriched semiconducting and metallic single-walled carbon nanotubes  

作　　者：Stuart J. Corr Mustafa Raoof Brandon T. Cisneros Alvin W. Orbaek Matthew A. Cheney Justin J. Law Nadia C. Lara Andrew R. Barron Lon J. Wilsor Steven A. Curley 

机构地区：[1]Division of Surgery, Baylor College of Medicine, Houston, TX 77030, USA [2]Department of Surgical Oncology, University of Texas M.D. Anderson Cancer Center, Houston, TX 77030, USA [3]Department of Chemistry and the Richard E. Smalley Institute for Nanoscale Science and Technology, Rice University, Houston, TX 77005, USA [4]Department of Surgery, The University of Arizona, College of Medicine, Tucson, AZ 85724, USA [5]Department of Chemistry and Biochemistry, University of California San Diego, La Jolla, CA 92093, USA [6]College of Engineering, Swansea University, Singleton Park, Swansea SA2 8PP, Wales, UK [7]Department of Mechanical Engineering and Materials Science, Rice University, Houston, TX 77005, USA

出　　处：《Nano Research》2015年第9期2859-2870,共12页纳米研究（英文版）

摘　　要：It is theorized that enhanced thermal heating may result from exposing single-walled carbon nanotubes （SWNTs） embedded in a conductive host to radiofrequency （RF） electric fields. We examine the RF-induced （13.56 MHz） heating behaviors of 95% metallic- and semiconducting-enriched SWNTs （m-/s-SWNTs） suspended in aqueous solutions with varying NaC1 molarity （0.001 mM-1 M）. The heating effects were only evident for host molarities below 1 mM （equivalent to 0.1 S/m） at which the s-SWNT heating rates dominated those of the m-SWNTs. The heating effects were localized to aligned and aggregated ＂SWNT ropes＂ -1 cm in length that formed in suspension, parallel to the electric-field vector, during the RF exposure. For molarities above 1 mM, no enhancements were evident, owing to the large heating effects of the bulk ionic NaC1 suspensions, which were observed in previous studies. Although larger enhancement effects proportional to the host conductivity have been theoretically predicted for m-/s-SWNT suspensions, this was not observed most likely because of the aggregation and screening effects, which diminished the scattered electric field near the m-/s-SWNTs. Our research may further the development of better nanoparticle heating agents for applications such as non-invasive RF-induced cancer hyperthermia.

关 键 词：rad.iofrequency carbon nanotubes metallic semiconducting hyperthermia 

分 类 号：O[理学]