«Breaking News» Real life 'shrink ray' can reduce 3D structures to one thousandth of their original size

MIT researchers have created a real life 'shrink ray' that can reduce 3D structures to one thousandth of their original size.

Scientists can put all kinds of useful materials in the polymer before they shrink it, including metals, quantum dots, and DNA.

The process is essentially the opposite of expansion microscopy, which is widely used by scientists to create 3D visualisations of microscopic cells.

Instead of making things bigger, scientists attach special molecules which block negative charges between molecules so they no longer repel which makes them contract.

Experts say that making such tiny structures could be useful in many fields, including in medicine and for creating nanoscale robotics. 

MIT researchers have created a real life 'shrink ray' that can reduce 3D structures (pictured) to one thousandth of their original size

'It's a way of putting nearly any kind of material into a 3-D pattern with nanoscale precision,' said Edward Boyden, an associate professor of biological engineering and of brain and cognitive sciences at MIT.

Using the new technique, researchers can create any shape and structure they want, according to the paper published in Science.

The method can create lots of different shapes, including tiny hollow spheres to microscopic chains. 

After attaching useful materials to the polymer 'scaffold', they shrink it, generating structures one thousandth the volume of the original.

The researchers shrank hollow linked cubes and an Alice in Wonderland etching using the method. 

After attaching useful materials to the polymer 'scaffold', they shrink it, generating structures one thousandth the volume of the original. The researchers shrank hollow linked cubes (pictured) using this method

Researchers shrank an Alice in Wonderland etching using the method.  Scientists say the technique uses equipment that many biology and materials science labs already have, making it widely accessible for researchers who want to try it

Scientists say the technique uses equipment that many biology and materials science labs already have, making it widely accessible for researchers who want to try it.

Currently scientists are able to directly print 3D nanonscale objects.

However, this is only possible with specialised materials like polymers and plastics which have limited applications.

To overcome this, researchers decided to adapt a technique that was developed a few years ago for high-resolution imaging of brain tissue.

This technique, known as expansion microscopy, involves embedding tissue into a hydrogel and then expanding it.

Hundreds of research groups in biology and medicine are now using expansion microscopy as it enables 3D visualisation of cells and tissues with ordinary hardware.

The new technique involves reversing the process.  

Scientists can put all kinds of useful materials in the polymer before they shrink it such as metals, quantum dots and DNA. Pictured is the machine used to shrink objects 

By doing this, scientists could create large-scale objects embedded in expanded hydrogels and then shrink them to the nanoscale.

They call this approach 'implosion fabrication.'

Just like they did in expansion microscopy, the researchers used a very absorbent material made of polyacrylate. This is a plastic commonly found in nappies.

The polyacrylate forms the scaffold over which other materials can be attached.

It is then bathed in a solution that contains molecules of fluorescein, which attach to the scaffold when they are activated by laser light.

Then, they use two-photon microscopy to target points deep within the structure.

They attach fluorescein molecules to these specific locations within the gel.

Researchers think these nanobjects could be used to create better lenses for cell phone cameras, microscopes (stock image), or endoscopes

These acts as anchors that bind to other types of molecules that are in the structure.

'You attach the anchors where you want with light, and later you can attach whatever you want to the anchors,' Dr Boyden said.

'It could be a quantum dot, it could be a piece of DNA, it could be a gold nanoparticle.'

Once the desired molecules are attached in the right locations, the researchers shrink the entire structure by adding an acid.

The acid blocks the negative charges in the polyacrylate gel so that they no longer repel each other, causing the gel to contract.

Using this technique, researchers can shrink the objects 10-fold in each dimension (for an overall 1,000-fold reduction in volume).

This ability to shrink not only allows for increased resolution, but also makes it possible to assemble materials in a low-density scaffold.

This means it can be easily modified and later the material becomes a dense solid when it is shrunk. 

Researchers think these nanobjects could be used to create better lenses for cell phone cameras, microscopes, or endoscopes. 

Farther in the future, researchers say that this approach could be used to build nanoscale electronics or robots.

WILL GLOBAL WARMING CAUSE SPECIES TO SHRINK?

A study conducted by the University of British Columbia (UBC) in Canada found that over the last century, the beetles in the region have shrunk.

By looking at eight species of beetle and measuring the animals from past and present they found that some beetles were adapting to a reduced body size.

The data also showed that the larger beetles were shrinking, but the smaller ones were not. 

Around 50 million years ago the Earth warmed by three degrees Celsius (5.4°F) and as a result, animal species at the time shrunk by 14 per cent. 

Another warming event around 55 million years ago - called the Paleocene-Eocene Thermal Maximum (PETM) - warmed the earth by up to eight degrees Celsius (14.4°F).

In this instance, animal species of the time shrunk by up to a third. 

Woolly mammoths were a victim of warming climate, shrinking habitat and increased hunting from a growing early-human population which drove them to extinction - along with many large animals

Shrinking in body size is seen from several global warming events.

With the global temperatures set to continue to rise, it is expected the average size of most animals will decrease. 

As well as global warming, the world has seen a dramatic decrease in the amount of large animals. 

So called 'megafauna' are large animals that go extinct. With long life-spans and relatively small population numbers, they are less able to adapt to rapid change as smaller animals that reproduce more often. 

Often hunted for trophies or for food, large animals like the mastadon, mammoths and the western black rhino, which was declared extinct in 2011, have been hunted to extinction. 

Link hienalouca.com

https://hienalouca.com/2018/12/14/real-life-shrink-ray-can-reduce-3d-structures-to-one-thousandth-of-their-original-size/
Main photo article MIT researchers have created a real life ‘shrink ray’ that can reduce 3D structures to one thousandth of their original size.
Scientists can put all kinds of useful materials in the polymer before they shrink it, including metals, quantum dots, and DNA.
The process is essentially the...

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