Colour-changing polymer tackles concussion diagnosis head on

By Matthew Gunther2015-08-19T00:00:00+01:00

No comments

Epoxy sponge that registers heavy knocks could alert doctors to head injuries in soliders and athletes

<cite>Yang lab</cite>Microscopy images of the photonic crystals after nano-indentation at 30 mN (left), 60 mN (middle) and 90 mN (right) are shown</div>Her concerns led her to seek a solution to the concussion diagnosis conundrum. Yang, along with colleagues at <a href="http://www1.villanova.edu/main.html">Villanova</a> and <a href="http://www.temple.edu/">Temple University</a>, looked to structural colours in nature for ideas. ‘We take inspiration from opal, which is made from silica beads,’ says Yang. She goes on to explain that such materials take on particular colours depending on their internal microstructure, and changes in this structure can alter how light is diffracted.But producing analogous crystals in the lab is incredibly expensive, so the team turned to flexible polymers instead. Yang and her colleagues used a light-sensitive epoxy named SU-8, melted it and poured it over a crystalline arrangement of opals. Once the polymer had cooled and solidified, the opals were removed to produce a porous polymer network resembling a sponge.‘Light coming towards this porous material gets reflected,’ says Yang. ‘It’s like the colour you see in iridescence in [a] soap bubble.’ The pores are acting as ‘inverse opals’, according to Yang.By applying a force roughly equivalent to a typical football tackle using nanoindentation, Yang was able to see the porous patch changed colour. ‘If you have external force hitting this porous material, the pore size [and] shape will be changed,’ she explains. ‘So, this … will cause a structural change, [which] causes a colour change.’Crucially this colour change is not reversed when the force is removed, making it ideal for protective equipment. ‘Once you remove the force, the material is permanently deformed,’ says Yang. It can also be tuned to accommodate for different coloured surfaces: ‘If we started with different nanoparticles, we can generate different initial colours, whether it’s a red, orange, green or purple.’Yang acknowledges, however, that a commercial product may still be a long way off, but she is glad that technology will help in tackling the concussion issue head on. ‘There [are] a lot of things we need to do,’ she says. ‘From a protective point of view, at least we can use this to tell people what’s going on.’

Topics

No comments

Research
Colour-changing graphene skin reveals hidden damage
2017-04-06T06:20:00Z
A coating inspired by fish scales could highlight structural weakness in buildings and vehicles
Research
Fun with f-elements
2021-06-23T08:49:00Z
Working with lanthanides and actinides may be challenging, but David Mills says the field is ripe for discovery
Feature
Supermetals versus superbugs
2021-06-21T09:01:00Z
With pathogenic bacteria rapidly overcoming our arsenal of organic antibiotics, James Mitchell Crow asks if it is time to revisit metal-based antimicrobials

No comments yet

You're not signed in. To link your comment to your profile, sign in now.

Only registered users can comment on this article.

More News

Research
Historic lead from petrol still poisons London’s air 20 years after its ban
2021-06-23T08:30:00Z
Two decades after leaded petrol was banned in the UK, the toxic metal still hangs around London’s dusty roads – and it’s not going away
News
Swiss decision to abandon trade talks raises questions over research relationship with EU
2021-06-22T14:30:00Z
Political fallout could hit Swiss involvement in European science programmes
Business
BMS and Eisai agree antibody-drug conjugate commercialisation deal
2021-06-22T09:50:00Z
Companies will jointly develop cancer treatment, with BMS paying up to $3 billion for shared rights