In cities and large-scale manufacturing plants, a water leak in a complicated network of pipes can take tremendous time and effort to detect, as technicians must disassemble many pieces to locate the problem. The American Water Works Association indicates that nearly a quarter-million water line breaks occur each year in the U.S., costing public water utilities about $2.8 billion annually.
A University of Washington team wants to simplify the process for discovering detrimental leaks by developing “smart” paper that can sense the presence of water. The paper, laced with conductive nanomaterials, can be employed as a switch, turning on or off an LED light or an alarm system indicating the absence or presence of water.
The researchers described their discovery in a paper appearing in the November issue of the Journal of Materials Chemistry A.
“Water sensing is very challenging to do due to the polar nature of water, and what is used now is very expensive and not practical to implement,” said lead author Anthony Dichiara, a UW assistant professor of bioresource science and engineering in the School of Environment and Forest Sciences. “That led to the reason to pursue this work.”
Along with Dichiara, a team of UW undergraduate students in the Bioresource Science and Engineering program successfully embedded nanomaterials in paper that can conduct electricity and sense the presence of water. Starting with pulp, they manipulated the wood fibers and carefully mixed in nanomaterials using a standard process for papermaking, but never before used to make sensing papers.
Discovering that the paper could detect the presence of water came by way of a fortuitous accident. Water droplets fell onto the conductive paper the team had created, causing the LED light indicating conductivity to turn off. Though at first they thought they had ruined the paper, the researchers realized they had instead created a paper that was sensitive to water.
When water hits the paper, its fibrous cells swell to up to three times their original size. That expansion displaces conductive nanomaterials inside the paper, which in turn disrupts the electrical connections and causes the LED indicator light to turn off.
This process is fully reversible, and as the paper dries, the conductive network re-forms so the paper can be used multiple times.
The researchers envision an application in which a sheet of conductive paper with a battery could be placed around a pipe or under a complex network of intersecting pipes in a manufacturing plant. If a pipe leaks, the paper would sense the presence of water, then send an electrical signal wirelessly to a central control center so a technician could quickly locate and repair the leak.
In addition, the paper is so sensitive that it can also detect trace amounts of water in mixtures of various liquids. This ability to distinguish water from other molecules is particularly valuable for the petroleum and biofuel industries, where water is regarded as an impurity.
“I believe that for large-scale applications, this is definitely doable,” Dichiara said. “The price for nanomaterials is going to drop, and we’re already using an established papermaking process. You just add what we developed in the right place and time in the process.”
The nanomaterials added to the paper were engineered in such a way that they can be incorporated during conventional papermaking without having to modify the process. These materials are made of extremely conductive carbon. Because carbon is found in all living things, nearly any natural material can be burned to make charcoal, and then carbon atoms can be extracted to synthesize the materials. The team has experimented with making nanomaterials from banana peels, tree bark and even animal feces.
They also tried making nanomaterials from wood scraps to show that the entire papermaking process can be completed with cheap, natural materials.
“Now we have a sustainable process where everything is from pulp and paper, and we can make conductive materials from them,” Dichiara said.
The paper, stiff and smooth in texture, is a rich black color because of the nanomaterials (carbon from charcoal). The 8-inch disks made in the lab are prototypes; the team hopes to test the process on an industrial-sized papermaking machine next, which will require more nanomaterials and paper pulp.
The Latest on: Smart paper
- Is Nine Dragons Paper (Holdings) Limited (HKG:2689) A Smart Choice For Dividend Investors?on September 6, 2019 at 5:10 pm
Dividend paying stocks like Nine Dragons Paper (Holdings) Limited (HKG:2689) tend to be popular with investors, and for good reason - some research suggests a significant amount of all stock ...
- P&G opens Smart Lab to speed product R&Don September 6, 2019 at 9:17 am
Procter & Gamble has opened the company’s first Smart Lab to speed research and development, which is based at the University of Illinois Research Park. The Cincinnati-based maker of consumer goods ...
- Tech firm FuseMe could make paper resumes obsoleteon September 6, 2019 at 5:51 am
If it’s up to local tech firm FuseMe, paper resumes and business cards will be a thing of ... forward recruiters their resume and other information by simply holding their smart phones next to each ...
- Fuji Xerox presents Innovation Re:Mix Forum - Future x Smart to re-imagine the future of workon September 5, 2019 at 11:44 pm
The Future x Smart edition featured an exciting line-up ... delegates were also taken through Fuji Xerox's augmented-reality paper trail. Set to redefine traditional processes, the experiential ...
- Lenovo Yoga Smart Tab & Smart Tab M8 Bridge The Smart Home Hub Gapon September 5, 2019 at 11:33 am
The Lenovo Smart Tab M8 comes packed with similar features to its Yoga-branded counterpart. It does that in a package that's only slightly less capable, at least on paper. To begin with, it's smart ...
- The No. 1 mistake 'even smart people make' when creating to-do lists, according to a productivity guruon September 5, 2019 at 11:23 am
When it comes to productivity and creating to-do lists, the biggest mistake that even smart people make is focusing too much ... Here's how it works: Grab a sheet of paper and a favorite pen and take ...
- Pug plays rock, paper, scissors with owneron September 5, 2019 at 9:57 am
A smart pug played rock, paper, scissors with her owner to win her babies back in eastern China. Labrador kisses send baby into giggle fit Labrador shares some kisses with a laughing baby in this ...
- E-paper Display Market 2019: Global Analysis, Share, Trends, Application Analysis and Forecast To 2023on September 5, 2019 at 3:52 am
For the same, they are increasingly leveraging hardware technologies such as e-paper displays. Rapid urbanization and growth initiatives to turn cities into smart cities also is a vital driver of the ...
- Bainbridge Health Convenes Its Clinical Advisory Board to Review EHR - Smart Infusion Pump Interoperability Trendson September 3, 2019 at 8:00 am
Findings from the Clinical Advisory Board can be found in the White Paper: Themes, Dreams & Data Schemes: A Review of Electronic Health Record and Smart Infusion Pump Interoperability Trends.
- GCSE PE – AQA (9-1) – Goal Setting & SMART Targets (Paper 2) - Knowledge Organiser/Revision Maton August 31, 2019 at 2:17 am
Physical education Physical education / Fitness training Physical education / Healthy, active lifestyle Physical education / Performance and sport psychology ...
via Google News and Bing News