Tuning the transmittance of colloidal solution by changing the orientation of Ag nanoplates in ferrofluid

Langmuir. 2012 Sep 11;28(36):13112-7. doi: 10.1021/la302353t. Epub 2012 Aug 27.


Ag nanoplates and Fe(3)O(4) nanoparticle-based ferrofluids were utilized to fabricate a magnetic field controlled optic switch. The changing of light transmittance (LT) is caused by the rotation of Ag nanoplates, whose long axis always follows the orientation of external magnetic field to minimize the potential energy. The sensitivity of switching was optimized by choosing Ag nanoplates with appropriate size and concentration. The switching of transmission is proved to be fast and fully reversible. This phenomenon not only indicates an effective method to adjust the propagation of optical signals, but also reveals the possibility and great potential to develop magnetic controlled functional devices.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Colloids / chemistry
  • Ferrosoferric Oxide / chemistry*
  • Magnetic Fields
  • Metal Nanoparticles / chemistry*
  • Particle Size
  • Silver / chemistry*
  • Solutions
  • Surface Properties


  • Colloids
  • Solutions
  • Silver
  • Ferrosoferric Oxide