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Quantum dot in gold

26.09.2009

Quantum dots are capable of fluorescence, that is, they glow when exposed to visible light. Gold nanoparticles glow when exposed to infrared light. Both types of these particles are used by biologists for diagnostics, and gold particles are also used for treatment, since when irradiated with microwaves, they heat the cell in which they find themselves.

Scientists from the University of Washington, led by Gao Xiaohu, came up with a technique that allows you to combine these particles into one. In accordance with it, a quantum dot is covered with a polymer layer, by changing the structure of which it is possible to set the shell thickness with an accuracy of one nanometer. Gold ions were deposited onto the polymer and a gold shell 2–3 nm thick was obtained.

From above everything was covered with polyhistidines. In the resulting particle with a diameter of 15–20 nm, the quantum dot regularly shone, and its light passed through a thin golden shell.

Since gold is not poisonous and is approved for use, many proteins can be attached to it, and the new system will be a good addition to existing nanomedicine tools.

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Micro-bots inside the human eye 13.11.2018

German scientists from the Max Planck Institute have created the so-called micro-propellers (micropropellors) or micro-bots. These tiny tadpole-like objects are 200 times smaller than the width of a human hair. The micro-bots can be controlled by magnets and used to inject medication directly into the spot in the eye where it is needed.

The scientists tested the micro-bots on eyeballs taken from dead pigs at a slaughterhouse (pig eyes are very similar to human eyes). Using a syringe, 10 miniature objects were immediately launched into the eyeball, and then in just 30 minutes, using a magnetic field, they were delivered from the retina to the back of the eye. This proved to be much faster and more effective than injecting drugs into the eye using eye drops or injections.

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Due to their miniature size and slippery coating, micro-bots can easily pass through the vitreous body, which is a thick gel-like substance that makes up 80% of the eye.

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