How to characterize Magnetically Tunable Colloidal Photonic Crystals easily and quickly
contributed by Malvern Panalytical |
Characterisation of Magnetically Tunable Colloidal Photonic Crystals Using the Zetasizer Nano
Recently, a magnetically tuneable photonic crystal system has been developed by assembling highly charged Fe3O4 colloidal nanocrystal clusters (CNCs) [1,2]. They have attracted much attention because of their optoelectronic applications such as photonic components in tele-communication devices, lasers, sensors, drug delivery system (DDS) and MRI contrast agents [1,2].
Stabilized by the balance of attractive (magnetic) and repulsive(electrostatic) forces, the colloids form ordered structures along the direction of the external magnetic field with a regular interparticle spacing on the order of hundreds of nanometers. As a result, the solutions strongly diffract visible light [1,2]. CNCs can tune the diffraction wavelength throughout the entire visible spectrum by changing the strength of the external field [1,2]. The tuning range of the diffraction wavelength is related to the average size of the colloidal nanocrystal clusters. In general, crystals of large clusters (160-180 nm) preferentially diffract red light in a relatively weak magnetic field. Small clusters (60-100 nm) form ordered structures only when the magnetic field is strong and the crystals preferentially diffract blue light [1,2].
Read the full article now
Log in or register to read this article in full and gain access to The Medicine Maker’s entire content archive. It’s FREE and always will be!
Or register now - it’s free and always will be!
You will benefit from:
- Unlimited access to ALL articles
- News, interviews & opinions from leading industry experts
- Receive print (and PDF) copies of The Medicine Maker magazine
Or Login via Social Media
By clicking on any of the above social media links, you are agreeing to our Privacy Notice.