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
[google_news title=”” keyword=”smart filter” num_posts=”10″ blurb_length=”0″ show_thumb=”left”]
via Google News
The Latest on: Smart filter
- Digital Filters Influence Surge in Cosmetic Procedureson February 29, 2024 at 5:00 pm
Smart phones seem to make everything easier, including communicating desired cosmetic improvements to your physician.
- Best air purifiers under ₹5000: Top 6 smart investments for improved breathingon February 29, 2024 at 1:18 am
Indoor air pollution poses a significant health hazard, making air purifiers essential protectors in homes and offices. These small yet powerful devices offer numerous benefits in creating safer, ...
- Get a free solar filter worth $249 with the purchase of any Unistellar telescopeon February 28, 2024 at 5:02 am
You can now get one of the best telescopes on the market and get a free solar filter, just in time for the next solar eclipse on April 8.
- Best Smart Thermostats for Keeping Your Home Comfortableon February 25, 2024 at 10:18 am
You’ll also receive alerts for power outages and maintenance needs, such as changing the air filter in your air conditioning and heating system. “[Smart thermostats] work particularly well for ...
- Smart Air Purifiers Market Outlook 2024, Share, Size, Key Players And Forecast By 2032on February 24, 2024 at 4:36 pm
IMARC Group's latest research report, titled “ Smart Air Purifiers Market : Global Industry Trends, Share, Size, Growth, Opportunity and Forecast 2024-2032,” the global smart air purifiers market size ...
- Vaonis Vespera II smart telescope reviewon February 24, 2024 at 12:00 am
The Vaonis Vespera II is one of the most budget-friendly smart telescopes, ideal for beginners — we think it's one of the best smart telescopes ever released.
- Reach for the stars as Uninstellar offers a FREE Smart Solar Filter across its rangeon February 22, 2024 at 8:17 am
Be smart and grab a FREE Smart Solar Filter with every select purchase of Unistellar telescopes, that is a smart way to shop ...
- Are Smart Security Systems Simply a Costly Way to Let Strangers Into Your Home?on February 22, 2024 at 5:03 am
From streams being sent unencrypted across the internet, to data sharing with police forces and social networks — let alone price hikes and all the software updates.
- Best smart thermostats that support Amazon Alexa in 2024on February 21, 2024 at 6:00 pm
Many great smart thermostats have several advantages over traditional options. For example, they include remote control, zone temperature control, and the ability to learn the users' habits to ...
- Smart Parts Unveils Revolutionary Washable Reusable Cabin Air Filterson February 21, 2024 at 5:41 am
Smart Parts proudly announces the launch of their revolutionary washable and reusable cabin air filters, marking a significant stride in sustainable vehicle maintenance solutions. With a commitment to ...
via Bing News