Researchers have designed a “fire alarm wallpaper” made of environmentally friendly, nonflammable materials—including some of the materials found in bone, teeth, and hormones—that can detect a fire, prevent the fire from spreading, and give off an alarm when a fire occurs. When exposed to heat, the wallpaper is transformed from an electrically insulating state into an electrically conductive one, causing it to automatically trigger an alarm that generates loud sounds and warning lights.
Most of today’s commercial wallpaper is made of highly flammable materials, such as plant cellulose fibers or synthetic polymers. Consequently, whenever a fire occurs, the wallpaper often causes the fire to spread.
“Compared with flammable commercial wallpaper, the fire-resistant wallpaper is superior owing to its excellent nonflammability, high-temperature resistance, and automatic fire alarm function,” Zhu told Phys.org. “The fire-resistant wallpaper has a white color, mechanical robustness, and high flexibility, it can be processed into various shapes, dyed with different colors, and printed with a commercial printer. Therefore, the fire alarm fire-resistant wallpaper has promising applications in high-safety interior decoration to save human lives and reduce the loss of property in a fire disaster.”
The new wallpaper is based on hydroxyapatite, which is the primary inorganic component of bone and teeth. Although hydroxyapatite is typically brittle and inflexible, in previous work the researchers found that forming ultralong nanowires made of hydroxyapatite gives the material a high flexibility suitable for making wallpaper.
In order to make the nonflammable wallpaper a “smart material” capable of automatically sounding an alarm in response to a fire, the researchers incorporated an ink-based thermosensitive sensor onto the wallpaper.
The thermosensitive sensor is fabricated on the surface of the wallpaper by a simple drop-casting process using an ink containing graphene oxide. The tiny sensor is placed on the backside of the fire- resistant wallpaper so that it is out of sight and protected by the fireproof wallpaper.
The sensor is composed primarily of graphene oxide, which is electrically insulating at room temperature. However, when exposed to heat, the oxygen-containing groups are removed, making the material highly conductive. The sensor is connected to an alarm, so when a fire occurs and the sensor begins to conduct electricity, it causes the alarm to go off.
Initially, one problem with the graphene oxide sensor was that it burned out very quickly, so that the alarm only lasted for about three seconds. To improve this, the researchers modified the graphene oxide with polydopamine—a material based on the hormone and neurotransmitter dopamine, found in living organisms. The polydopamine-modified graphene oxide has a much lower thermal responsive temperature than graphene oxide by itself, meaning that it not only responds to fire more quickly (in about two seconds), but also has a prolonged alarm time of more than five minutes.
In the future, the researchers plan to scale up production of the wallpaper, as well as investigate other applications of the new fire-resistant material.
“The mass production of ultralong hydroxyapatite nanowires as the raw material for the smart fire alarm fire-resistant wallpaper is critical,” Zhu said. “To date, we have realized the scaled-up production of ultralong hydroxyapatite nanowires in an autoclave with a volume of 100 liters in our laboratory. We are striving to explore the low-cost and environmentally friendly large-scale production technology for ultralong hydroxyapatite nanowires. In addition, many companies are interested in the new kind of the fire-resistant paper, and we will collaborate with some companies to realize industrial-scale production in the future.
“We have also been exploring various applications of the new kind of fire-resistant paper based on ultralong hydroxyapatite nanowires in many other fields, such as preserving important paper documents, energy, air purification, water treatment, environment protection, anti-counterfeiting, flexible electronics, and biomedical uses.”
The Latest on: Fire alarm wallpaper
via Google News
The Latest on: Fire alarm wallpaper
New Wallpaper Will Tell You a Home is on Fire
on April 13, 2018 at 8:43 am
When heat rises above a certain temperature, it will close a circuit and activate an alarm. And just like commercial wallpaper, it will come in a variety of prints and colors. “A smart fire-resistant and fire alarm wallpaper will be very desirable if it ... […]
Chinese scientists invent “fire alarm wallpaper”
on April 13, 2018 at 7:14 am
Researchers from the Shanghai Institute of Ceramics and the Chinese Academy of Sciences have developed a wallpaper that not only resists fire, but raises the alarm when one breaks out. In a paper published in the American Chemical Society’s ACS Nano ... […]
Researchers Develop A Fire-Detecting Wallpaper
on April 13, 2018 at 5:25 am
A new wallpaper may be able to detect fires, reports James Holloway for New Atlas. Researchers at the Shanghai Institute of Ceramics at the Chinese Academy of Sciences have come up with a “fire alarm wallpaper” which can both detect a house fire and ... […]
Researchers develop fire-detecting wallpaper
on April 12, 2018 at 5:30 am
The researchers think their wallpaper could one day help prevent loss of property due to fire(Credit: Shanghai Institute of Ceramics) Researchers have come up with what they call a "fire alarm wallpaper" which can not only detect a house fire, but also ... […]
Fire-detecting wallpaper made from materials found in bones and teeth could replace smoke alarms
on April 11, 2018 at 10:09 am
SCIENTISTS have invented a fire-detecting wallpaper made of materials found in bone, teeth, and hormones that sounds an alarm when it senses heat and flames. Most of the wallpaper you can buy in the shops today is made of highly-flammable materials such as ... […]
This Smart Wallpaper Could Help Protect Your Home From Fire
on April 11, 2018 at 8:47 am
Scientists, researchers, and engineers are working around the clock to develop the newest, smartest home tech, such as the fire alarm wallpaper coming out of the Shanghai Institute of Ceramics and the Chinese Academy of Sciences. In research published in ... […]
Scientists are developing wallpaper that can tell when your house is on fire
on April 11, 2018 at 6:35 am
Today, wallpaper is merely decoration. But in the future it could function as a built-in fire detector and alarm. Researchers at Shanghai’s Institute of Ceramics are developing a new kind of wallpaper made from graphene oxide and hydroxyapatite nanowires ... […]
This Fire-Resistant Wallpaper Sets off an Alarm When It Detects Heat and Flames
on April 11, 2018 at 6:13 am
Chinese researchers have developed a kind of wallpaper that can detect heat and flames, essentially turning whole rooms into fire alarms. Researchers at the Shanghai Institute of Ceramics, Chinese Academy of Sciences, first created a type of heat and fire ... […]
This heat-resistant wallpaper could turn an entire room into what?
on April 10, 2018 at 1:43 pm
Researchers from the Shanghai Institute of Ceramics, Chinese Academy of Sciences, have developed a wallpaper that is not only heat resistant, but also capable of sounding the alarm when it detects a fire. They found that hydroxyapatite, a material in bones ... […]
via Bing News