Equipment- and training-free textile detectors could be used in public health, workplace safety, military and rescue applications
Tufts University engineers have developed a novel fabrication method to create dyed threads that change color when they detect a variety of gases. The researchers demonstrated that the threads can be read visually, or even more precisely by use of a smartphone camera, to detect changes of color due to analytes as low as 50 parts per million. Woven into clothing, smart, gas-detecting threads could provide a reusable, washable, and affordable safety asset in medical, workplace, military and rescue environments, they say. The study, published today in the journal Scientific Reports, describes the fabrication method and its ability to extend to a wide range of dyes and detection of complex gas mixtures.
While not replacing the precision of electronic devices commonly used to detect volatile gases, incorporation of gas detection into textiles enables an equipment-free readout, without the need for specialized training, the researchers say. Such an approach could make the technology accessible to a general workforce, or to low resource communities that can benefit from the information the textiles provide.
The study used a manganese-based dye, MnTPP, methyl red, and bromothymol blue to prove the concept. MnTPP and bromothymol blue can detect ammonia while methyl red can detect hydrogen chloride – gases commonly released from cleaning supplies, fertilizer and chemical and materials production. A three-step process “traps” the dye in the thread. The thread is first dipped in the dye, then treated with acetic acid, which makes the surface coarser and swells the fiber, possibly allowing more binding interactions between the dye and tread. Finally, the thread is treated with polydimethylsiloxane (PDMS), which creates a flexible, physical seal around the thread and dye, which also repels water and prevents dye from leaching during washing. Importantly, the PDMS is also gas permeable, allowing the analytes to reach the optical dyes.
“The dyes we used work in different ways, so we can detect gases with different chemistries,” said Sameer Sonkusale, professor of electrical and computer engineering at Tufts University’s School of Engineering who heads the Nano Lab at Tufts and is corresponding author of the study. Sonkusale’s team used simple dyes that detect gases with acid or base properties. “But since we are using a method that effectively traps the dye to the thread, rather than relying so much on binding chemistry, we have more flexibility to use dyes with a wide range of functional chemistries to detect different types of gases,” he said.
The tested dyes changed color in a way that is dependent and proportional to the concentration of the gas as measured using spectroscopic methods. In between the precision of a spectrometer and the human eye is the possibility of using smart phones to read out and quantify the color changes or interpret color signatures using multiple threads and dyes. “That would allow us to scale up the detection to measure many analytes at once, or to distinguish analytes with unique colorimetric signatures,” said Sonkusale.
The threads even worked under water, detecting the existence of dissolved ammonia. “While the PDMS sealant is hydrophobic and keeps water off the thread, the dissolved gases can still reach the dye to be quantified.” said Rachel Owyeung, lead author and graduate student in the Tufts Department of Chemical and Biological Engineering. “As dissolved gas sensors, we imagine smart fabrics detecting carbon dioxide or other volatile organic compounds during oil and gas exploration as one possible application.”
Since repeated washing or use underwater does not dilute the dye, the threads can be relied upon for consistent quantifiable detection many times over, the researchers said.
The Latest on: Sensing threads
via Google News
The Latest on: Sensing threads
- Practical 3D printing: The importance of filament runout sensorson April 16, 2021 at 7:43 am
Topic: 3D Printing FDM (fused deposition modeling) 3D printers, better known as filament 3D printers, come in a wide range of models, at a wide range of prices, with many different features. The ...
- Newcomers' guide to watching MLS in 2021on April 16, 2021 at 6:46 am
But I am a little more sure that you or someone you know is new to MLS this year. And what an excellent year it is to be new to MLS. The talent level keeps rising, new stadiums are appearing by the ...
- Mitakon Speedmaster 35mm F0.95 Mark II lens now available for Micro Four Thirds camera systemson April 15, 2021 at 9:06 am
Chinese optics manufacturer Mitakon Zhongyi has announced its Speedmaster 35mm F0.95 Mark II manual lens is now available for Micro Four Thirds (MFT) camera systems. Until now, the ultra-fast prime ...
- What Oil, Satellite Technology and Iraq can Tell us About Pollutionon April 15, 2021 at 4:14 am
Measuring the extent of pollution in Iraq is a challenge. But open source techniques can help put the issue into context as well as show how communities are being impacted.
- 12 ways to turn your bedroom into a sleep sanctuaryon April 14, 2021 at 6:32 pm
Dr Frank Lipman and Neil Parikh claim your night-time surroundings can either interfere or encourage restorative benefits. Here, they share advice for improving your sleep environment.
- Google Pixel 5 Review and Evaluationon April 14, 2021 at 1:43 pm
Refined & more reliable, the Pixel 5 is Google’s best phone yet. Learn about the camera specs and how it stacks up against the Pixel 4 & iPhone 12 Mini.
- TTArtisan adds $250 Nikon Z, Sony E mount versions of its 21mm F1.5 lenson April 13, 2021 at 6:51 am
Originally limited to Leica M mount camera systems, the 21mm F1.5 lens is now offered in Nikon Z and Sony E mounts for $245.
- Can F-35s and Warships Take Out Enemy Drones and Missiles?on April 13, 2021 at 5:52 am
Recently, U.S. Army missile defense assets, Dutch F-35 stealth fighters and joint multi-domain command and control systems destroyed enemy drone targets and knocked out cruise missile attacks during ...
- Sensemetrics introduces Strand IIoT sensor connectivity deviceon April 7, 2021 at 10:09 am
Sensemetrics, a global industrial internet-of-things (IIoT) and cloud technology company has introduced the Strand, a new sensor connectivity device for the infrastructure, mining, and other ...
- Silicon Temperature Sensor Market 2021 Production, Revenue, Growth Rate, value and Gross Margin, With Impact of the domestic and global market 2026on April 6, 2021 at 11:14 pm
Global Silicon Temperature Sensor Market: Drivers and Restrains The research report ... Segmentation and Forecast with Top Growth Companies Global Rubber Latex Thread Market Size 2021 Top ...
via Bing News