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
- Zuckerberg Vetoed Ban on Plastic Surgery Filters Despite Concerns for Teens, Suit Claimson November 27, 2023 at 12:32 pm
Mark Zuckerberg vetoed a proposal at Meta Platforms Inc. to ban filters that simulate the effects of plastic surgery, despite concerns that the technology could harm girls’ mental health, according to ...
- Honeywell to Xiaomi Smart, check out the top 6 air purifiers to tackle pollution woeson November 27, 2023 at 7:43 am
Concerned about air pollution? Want the best air for your family? From Honeywell to Xiaomi Smart Air Purifier, discover the top 6 air purifiers for a breath of fresh air indoors.
- Cyber Monday 2023 bestsellers: AirTags, smart plugs and cat treatson November 27, 2023 at 6:05 am
Select independently determines what we cover and recommend. When you buy through our links, we may earn a commission. Learn more. To help you make the most of the savings event, we complied the most ...
- Best Smart Home Gyms for 2024on November 27, 2023 at 6:00 am
We tested the top smart home gyms and narrowed it down to the very best. Here are our top picks for smart home gyms to meet your fitness goals from the comfort of your home.
- Best FAQs on Air Filters Camfil Canada Web Resource Now Onlineon November 25, 2023 at 8:00 am
In the web resource titled "FAQs on Air Filters," a Camfil Canada expert offers an in-depth look at these topics and more, as part of our two-part series featuring Canadian air filter expert Berni ...
- Utilities Kingston Launches Home Heating Week with Smart Thermostat Drawon November 23, 2023 at 7:26 pm
Get expert tips, tricks, and ideas to keep your home comfortable and energy-efficient during the colder months and manage heating costs all winter long.
- How to filter and sort emails on your iPhone, iPadon November 22, 2023 at 8:00 am
Kurt “The CyberGuy" Knutsson offers tips on how to filter and sort emails to keep just the ones you need on your iPhone and iPad.
- Samsung smartphones get a ND filter… but not all!on November 22, 2023 at 3:54 am
Misled by information published by various websites, I believed my Samsung Galaxy S22 Ultra was getting a ND filter as part of the recent upgrade to Android 14. No! It’s only for the Galaxy S23 Ultra!
- Hero-backed Qubo introduces smart air purifiers in India: Check featureson November 22, 2023 at 1:20 am
Hero Electronix's Qubo has introduced a new line of smart air purifiers in India, featuring three models, namely Q200, Q400, and Q500, designed for various room sizes, from bedrooms to large living sp ...
- Qubo smart air purifiers with 4-layer purification launched in India: price, features, availabilityon November 21, 2023 at 12:53 pm
Qubo smart air purifiers price in India, availability and more have been revealed. Check out to know about the Qubo smart air purifiers.
via Bing News