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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Vedova, Paolo Della Ilieva, Mirolyuba Zhurbenko, Vitaliy Mateiu, Ramona Faralli, Adele Dufva, Martin Hansen, Ole |
| Description | Country affiliation: Denmark Author Affiliation: Vedova PD ( DTU Nanotech Department of Micro- and Nanotechnology, Technical University of Denmark, Building 345E, DK-2800, Kgs. Lyngby, Denmark.) |
| Abstract | A novel molecular beacon (a nanomachine) is constructed that can be actuated by a radio frequency (RF) field. The nanomachine consists of the following elements arranged in molecular beacon configuration: a gold nanoparticle that acts both as quencher for fluorescence and a localized heat source; one reporter fluorochrome, and; a piece of DNA as a hinge and recognition sequence. When the nanomachines are irradiated with a 3 GHz RF field the fluorescence signal increases due to melting of the stem of the molecular beacon. A control experiment, performed using molecular beacons synthesized by substituting the gold nanoparticle by an organic quencher, shows no increase in fluorescence signal when exposed to the RF field. It may therefore be concluded that the increased fluorescence for the gold nanoparticle-conjugated nanomachines is not due to bulk heating of the solution, but is caused by the presence of the gold nanoparticles and their interaction with the RF field; however, existing models for heating of gold nanoparticles in a RF field are unable to explain the experimental results. Due to the biocompatibility of the construct and RF treatment, the nanomachines may possibly be used inside living cells. In a separate experiment a substantial increase in the dielectric losses can be detected in a RF waveguide setup coupled to a microfluidic channel when gold nanoparticles are added to a low RF loss liquid. This work sheds some light on RF heating of gold nanoparticles, which is a subject of significant controversy in the literature. |
| File Format | HTM / HTML |
| ISSN | 16136810 |
| Issue Number | 2 |
| Journal | Small |
| Volume Number | 11 |
| e-ISSN | 16136829 |
| Language | English |
| Publisher | Wiley-VCH |
| Publisher Date | 2015-01-14 |
| Publisher Place | Germany |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Discipline Nanotechnology Gold Chemistry Metal Nanoparticles Radio Waves Microscopy, Electron, Transmission Journal Article Research Support, Non-u.s. Gov't |
| Content Type | Text |
| Resource Type | Article |
| Subject | Chemistry Nanoscience and Nanotechnology Medicine Biomaterials Engineering Biotechnology |
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