The building blocks of rationally designed chemicals are simple elements: carbon, hydrogen, oxygen and so on. These elements can be combined in myriad ways to accomplish a variety of chemicals with different characteristics. Even the same chemical can be treated differently – with pressure or heat, for example – to show drastically different properties. A simpler version is to think of how water can be boiled to cook pasta or frozen to become ice – the same ingredient can be made into two different states via temperature treatment.
Now, researchers are working to better control how the chemicals respond to treatment, as well as how to reverse the chemicals back to their original state with little to no interference. Such control would allow scientists to prepare the sensing systems of environmental stimuli, as well as continuously repeat the sensing.
A team of researchers at Yokohama National University has achieved such results with a specific compound that can emit light and has potential applications in the next generation of smart devices such as wearable devices and anti-counterfeiting paintings. They published their results online on September 12, ahead of print in Chemical Communications.
The compound is a derivative of thiophene, which is a dye with mechanochromic luminescence properties — it changes color under physical change. It starts emitting a violet glow under the irradiation of UV light, but as it is exposed to mechanical stimuli, such as grinding, the violet glow shifts slightly to blue. Another external intervention can make the compound heal and become violet again.
“Mechanochromically luminescent (MCL) dyes have recently attracted considerable interest on account of their potential applications,” said Suguru Ito, paper author and associate professor in the Department of Chemistry and Life Science in the Graduate School of Engineering Science at Yokohama National University. “However, it is still very difficult to rationally design MCL dyes with desired characteristics.”
In this study, however, researchers discovered that by adding another chemical called DMQA, the dye changed to orange under mechanical stimuli. The dye did not need more external stimuli to revert back to violet either.
“We combined two kinds of rational design guidelines for tuning the luminescent properties, resulting in the desired — and unprecedented– characteristics of high-contrast, self-recovering dyes,” Ito said.
The first rational design guideline is that the recovery behavior of the dye can be attributed to the length of the alkyl group in the compound — a longer chain of carbon atoms with hydrogens in the dye allows the dye to recrystallize and heal in time. The second is that by mixing with DMQA, the color range between the original state and ground state differ greatly.
“The next step is to establish a rational design guideline to control the dye’s responsiveness to mechanical stimuli,” Ito said. “My ultimate goal is to develop an innovative pressure-sensing system by rationally creating a material that can change its emission color in stages in response to mechanical stimuli of different intensity.”
With such control, Ito could use mechanical stimuli to precisely induce a specific and intended response. A little pressure could shift the violet glow to blue, a little more pressure pushes the glow closer to red. A system with such ability would allow for stepwise changes and recoveries by the stimulus, which could be highly beneficial in the next generation of smart materials, according to Ito.
The Latest on: Smart materials
via Google News
The Latest on: Smart materials
- Tishman Speyer-backed SPAC to take smart-lock maker Latch public in $1.6 bln dealon January 25, 2021 at 9:06 am
Latch Inc said on Monday it plans to go public through a merger with blank-check company TS Innovation Acquisitions Corp, backed by U.S. property developer Tishman Speyer, in a deal that values the ...
- Smart Ticketing Market 2021 Growth and Analysis, Top Manufacturers, Industry Trends, Size, Industry Share, Forecast to 2026on January 25, 2021 at 8:57 am
Jan (The Expresswire) -- Global “Smart Ticketing Market” research report contains in depth information of industry by size, major ...
- 'Smart bandage' detects, could prevent infectionson January 25, 2021 at 6:36 am
Bandages are great for covering wounds, but they would be much more useful if they could also detect infections.
- Rutgers engineers create 3D-printed smart gel inspired by cephalopodson January 21, 2021 at 9:05 pm
Inspired by the camouflage mechanisms of cephalopods, Rutgers engineers have created a 3D-printed smart gel that changes shape and color when exposed to light, according to their study.
- SMART Makes it Easier for Teachers to Lead Virtual Classrooms with Leading Video Conferencing Platformson January 21, 2021 at 6:46 am
With educators worldwide continuing to teach amid the challenges of remote and hybrid instruction, SMART Technologies — the edtech leader with a 30-year track record of pioneering learning solutions ...
- Mobility And 5G Drive Adoption Of New Materials For Power Deviceson January 21, 2021 at 12:58 am
The power electronics industry is transitioning from silicon to wide bandgap compound semiconductor materials such as silicon carbide and gallium nitride.
- Smart Construction Network Launcheson January 21, 2021 at 12:10 am
Hundreds of businesses look towards a smarter future for construction The Supply Chain School working with Build Offsite has today launched the Smart Construction Network, building on a Construction ...
- Smart Lock Installation Costs in Calumet, MI in 2021on January 20, 2021 at 4:36 pm
Looking for top Smart Lock Installation professionals in your area? Get a free estimate on any project from our pre-screened contractors today!
- Smart Meter Market Analysis Report contains all study material about Market Overview, Growth, Demand and Forecast Research with Top Countries Dataon January 20, 2021 at 8:36 am
Smart Meter Market " Research Report 2021-2024 provides key analysis on the market status of the Smart Meter manufacturers with best facts and figures, meaning, definition, SWOT analysis, expert ...
- Transparent Solar Cells Eyed for Smart, Energy-Sustainable Buildingson January 19, 2021 at 4:00 pm
Indeed, the combination of materials created a TPV with three key characteristics that make it optimal for use in smart windows, researchers reported. Their proof of the device is based on using it to ...
via Bing News