The thermochromic liquid changing color in reaction to a change in temperature
Nanowires that form and disperse as the temperature changes form the basis of a robust thermochromic liquid
A smart liquid that darkens dramatically in response to rising temperature has been developed by researchers at A*STAR. The nanowire-based thermochromic liquid’s tunable color-changing behavior was retained even after hundreds of heat-cool cycles. This liquid could have applications ranging from smart windows to paper-based temperature sensors, the researchers say.
Previous thermochromic liquids have usually been based on organic dyes or liquid crystals. Although amenable to industrial-scale production, organic dyes tend to degrade upon exposure to light, while liquid crystals require encapsulation to avoid degradation in air. A thermochromic liquid that overcomes these limitations has been discovered by Wen-Ya Wu and her colleagues from the A*STAR Institute of Materials Research and Engineering, in collaboration with researchers at the National University of Singapore.
Wu’s research is focused on semiconductor nanocrystals, which form a colloidal suspension in certain solvents, and which are known for their broad light absorption and high photostability. “While exploring the synthesis of colloidal antimony selenide (Sb2Se3) nanoparticles, we serendipitously discovered that they formed crystalline nanowires upon heating and dissolved into their molecular precursors upon cooling, in a certain mixture of solvents,” Wu says.
Thanks to their broad light-absorbing behavior, a vial of Sb2Se3 nanowires formed by heating can appear very dark. But a solution of their molecular precursors, which the nanowires revert to upon cooling, are relatively transparent. “This phenomenon formed the basis for developing these materials as liquid-based thermochromics,” Wu says.
The team showed that the thermochromic liquid’s color-changing behavior is long-lived and robust. A solution of the molecular precursors was stable even after two years in ambient conditions, and could be heated and cooled hundreds of times without any loss of performance. An additional advantage was that the color change transition temperature could be tuned to be anywhere between 35 and 140 degrees Celsius by simply adding a small amount of tin chloride to the mixture. The tin species interact with the selenium precursor, reducing the temperature for nanowire growth.
When the researchers coated their thermochromic solution on to filter paper, they showed that it could differentiate between cooler and hotter regions of an irregularly heated surface. “Our liquid-based thermochromic system potentially allows coating on to a large variety of surfaces,” Wu says. One potential avenue is self-regulating windows that darken on hot days.
The team next plans to use transmission electron microscopy to study the mechanism of reversible nanowire growth, to aid the rational design of new colloidal nanomaterial thermochromics.
Learn more: Smart liquid goes dark in the heat
The Latest on: Colloidal nanomaterial thermochromics
[google_news title=”” keyword=”colloidal nanomaterial thermochromics” num_posts=”10″ blurb_length=”0″ show_thumb=”left”]
via Google News
The Latest on: Colloidal nanomaterial thermochromics
- Colloidal Nanoparticles Explainedon February 25, 2024 at 3:58 am
Colloidal nanoparticles are particles that operate at the nanoscale, specifically between 1 to 1000 nanometers, suspended in a fluid. These nanoparticles can consist of various materials, such as ...
- Nanomaterial with potential to tackle multiple global challenges could be developed without risk to human healthon February 16, 2024 at 2:16 am
A revolutionary nanomaterial with huge potential to tackle multiple global challenges could be developed further without acute risk to human health, research suggests. The study is published in ...
- Colloidal Oatmeal: The Skincare Ingredient For Soothing Fussy Skinon December 21, 2023 at 1:02 am
There are lotions and potions galore at your local beauty shop and online, but colloidal oatmeal is one of the best ingredients to soothe your rattled skin. That might sound familiar to you if you ...
- Take a Healing Bathon May 31, 2023 at 2:52 pm
That said, here are three healing baths to try: Joie Power, Ph.D., director of The Aromatherapy School in Fairview, North Carolina, agrees, adding, "be sure that you use colloidal oatmeal ...
- Nanomaterials Databaseon March 17, 2022 at 9:51 pm
If 50% or more of the constituent particles of a material in the number size distribution have one or more external dimensions in the size range 1 nm to 100 nm, then the material is a nanomaterial.
- The rise of colloidal quantum dotson April 24, 2019 at 12:21 pm
This issue features a theme on colloidal quantum dots, bringing together primary research findings and overviews, along with articles on the commercialization of this technology. It is a commonly ...
- Abundance and Variation of Colloidal Organic Phosphorus in Riverine, Estuarine, and Coastal Waters in the Northern Gulf of Mexicoon February 18, 2019 at 1:32 pm
This is the metadata section. Skip to content viewer section. The abundance of colloidal organic phosphorus (COP) and colloidal inorganic phosphorus (CIP) was quantitatively determined using an ...
- ZetaProbe Analyzer™ from Colloidal Dynamicson February 26, 2015 at 1:02 am
The ZetaProbe is the easiest to use, most accurate zeta potential analyzer available. Samples can be measured without dilution or sample preparation at concentrations up to 60% volume. Even the ...
- Research: Autonomic Self-Healing Materials Using Electric-Field Induced Colloidal Aggregationon April 16, 2012 at 5:19 pm
To expand the self-healing concept to other technically important materials, such as metals and ceramics, new methods involving electric-field induced colloidal aggregation are being explored. This ...
via Bing News