Researchers at the Laboratory of Organic Electronics have discovered a material that can both increase and reduce its volume when exposed to a weak electrical pulse. In a sponge, or filter, the researchers can control the size of particles that pass through.
Materials, such as solids and gels, that change volume depending on temperature or pH have long been available. Such materials are used in control units (one example of which are windows in greenhouses that automatically open and close depending on the temperature). They are also used in robots and in other electromechanical systems and in applications in biomedicine. One property that researchers have, however, long sought is the change of a material from a solid form to a gel state with the aid of an electrical signal. It is particularly desirable that such electronic control of the phase transition is reversible. The goal is to be able to control the volume by electrical means. This is possible in current materials, but researchers have only been able to achieve at most a doubling of the volume.
A new material
Scientists at the Laboratory of Organic Electronics, Campus Norrköping, have now discovered a new material, a conducting polymer, that can increase its volume by a factor of more than 100. The material was synthesized in collaboration with researchers from Imperial College in London. The change takes place when the material is placed into an electrolyte and subjected to a weak electrical voltage of +0.8 V. If a negative voltage, -0.8 V, is instead applied, the material contracts, nearly the whole way back to its original volume.
This is a significantly larger volume change than those previously reported, not only in conducting polymers but also in other materials controlled by an electrical signal.
Experiments carried out by Johannes Gladisch and Eleni Stavrinidou have involved the conducting polymer being placed as a film with a thickness of a few micrometres around an electrically conducting carbon fibre.
When electrical pulses with magnitudes of +0.5 V or +0.8 V are applied, the material changes its internal structure, then absorbs water and is finally converted to a gel that expands to 14 or 120 times the original volume. When pulses of magnitude +/- 0.5 V are repeatedly applied, the material expands by approximately 300%, or to three times, with respect to its previous contracted state. The change in volume is reversible.
Changing the pores
The scientists also describe an application in the article, published in Advanced Science. This is a smart sponge, or filter, in which they can control the expansion electronically, and in this way change the pore size by 85%.
“We can control the pore size of a filter electronically, and potentially actively control the size of particles that pass through. This means that the properties of this smart filter can be dynamically changed to allow different types or different sizes of particle to pass through. This function can be used for sieving, filtration, purification, and in process chemistry. It may also have applications in medicine and biochemistry”, says Magnus Berggren, professor in organic electronics and director of the Laboratory of Organic Electronics.
The Latest on: Smart filter
via Google News
The Latest on: Smart filter
- Inside all the new HomeKit products coming out in 2020on February 1, 2020 at 9:13 am
The Smart Learning System includes a Smart Learning Button ... What is particularly unique is that the filter inside never needs to be replaced, and instead can be watched. It also can filter PM 1.0 ...
- Hyundai to offer free maintenance on all new vehicleson February 1, 2020 at 5:00 am
The program is available for new 2020 Hyundai models purchased or leased on or after Feb. 1 and covers scheduled oil and filter changes and tire rotations during the three-year ... Hyundai will use ...
- 15 Best Deals on Tech, Travel, and Smart Home Gearon January 31, 2020 at 11:00 pm
Vizio 65-inch LED P Series Quantum 4K Smart TV + $250 Dell Gift Card for $900 ($500 off): Vizio's 4K TV supports ... Like any UV water treatment, if the water is cloudy with sediment, you'll have to ...
- Amazon’s Echo Show can now scan barcodes to flesh out your shopping liston January 31, 2020 at 4:57 pm
In our review of the Amazon Echo Show 5 smart display, Dan called it the “smart alarm clock to get ... (It might also be handy for products with hard-to-remember dimensions, like a furnace filter or a ...
- 10 neat and ridiculous smart things to use with your Google Homeon January 30, 2020 at 5:14 pm
The Smart Coffee coffee machine allows you to do just that. It’s unlikely to replace your local baristra anytime soon but you can customise it to your liking through dedicated strength, filter and ...
- Best Air Filters for Your Furnace and Central ACon January 29, 2020 at 4:22 pm
Hidden away in your basement or attic, the air filter in your HVAC system is something you probably don’t think about much. But a good air filter keeps your furnace and central air conditioner ...
- Smart Air Purifiers Market to Witness Growth Acceleration during 2018-2025 | Honeywell, Koninklijke Philips, Sunbeam Productson January 28, 2020 at 2:20 am
Moreover, people have become more technology oriented, and tend to invest significantly on high-end products such as smart air purifiers owing to increase in per capita income of the population in the ...
- The Rise of Smart Camera Networks, and Why We Should Ban Themon January 27, 2020 at 10:05 am
We could add automated “filters” that only record when a loud noise is detected, or when someone grabs a knife. Should police put smart cameras inside every living room? The commercial sector ...
- AA not convinced Highways England review will fix smart motorway road safety issueson January 27, 2020 at 4:56 am
READ MORE: Smart motorway: Highways England could upgrade smart roads ... building more of the dynamic hard shoulders which can be used as a live lane to help filter traffic. More emergency refuge ...
- 11 smart kitchen appliances that pair with helpful apps to make cooking easieron January 21, 2020 at 4:45 pm
These smart kitchen gadgets combine tech with traditional appliances to guide you through the cooking process and help make cooking easier.
via Bing News