First, I would like to thank Prof. Manu and his lab for providing us an opportunity to use Foldscope. It is a wonderful invention.
Now coming to my work on Foldscope:
We work on manipulating magnetic nano particle (MNP) using permanent magnets for drug delivery applications. The magnets are big and strong about 1 to 2 Tesla. A typical bar magnet placed near a glass slide is shown in Figure 1 (0.4 Tesla magnet) and Figure 2 (1 Tesla magnet).
As the magnets are stronger, we found it hard to place them near microscope to capture videos of MNP motion when subjected to magnetic fields. Therefore we needed a system to easily visualize the particle motion with no metal nearby the magnets.
We used Foldscope to visualize MNP and a simple experimental setup is shown in Figure 3. where a small magnet along with the glass slide is also placed near the Foldscope. The video of MNP motion are captured by placing phone camera.
Experiments showed MNP motion under high mag lens using both small and big bar magnet. We used two types of particles during experiment (video attached):
- Nanoparticle: nano-screen-magr-chitosan-prednisolone (300 nm size-nominal diameter)
2. Particle type: piercetm-protein-a-magnetic-beads (1 um size-nominal diameter)
We are further looking to work on much bigger magnets such as : Brick magnet (our lab’s previous work). These magnets are bigger than those used for our Foldscope experiments. However, if we try to move the mobile phone closer to the foldscope with the magnet in the vicinity, due to the magnetic field interference phones are turning off. We are currently trying to solve this issue. Any alternative ideas you might have to resolve this issue are welcome and will be appreciated.
Again thank you for Prof. Manu Prakash for providing us with Foldscopes, which turned out to be a handy tool during our experiments. We are planning on carrying out more experiments in the near future using Foldscope to record MNP motion.