An adaptive material invented at Rice University combines self-healing and reversible self-stiffening properties.
The Rice material called SAC (for self-adaptive composite) consists of what amounts to sticky, micron-scale rubber balls that form a solid matrix. The researchers made SAC by mixing two polymers and a solvent that evaporates when heated, leaving a porous mass of gooey spheres. When cracked, the matrix quickly heals, over and over. And like a sponge, it returns to its original form after compression.
The labs of Rice materials scientists Pulickel Ajayan and Jun Lou led the study that appears in the American Chemical Society journal ACS Applied Materials and Interfaces. They suggested SAC may be a useful biocompatible material for tissue engineering or a lightweight, defect-tolerant structural component.
Other “self-healing” materials encapsulate liquid in solid shells that leak their healing contents when cracked. “Those are very cool, but we wanted to introduce more flexibility,” said Pei Dong, a postdoctoral researcher who co-led the study with Rice graduate student Alin Cristian Chipara. “We wanted a biomimetic material that could change itself, or its inner structure, to adapt to external stimulation and thought introducing more liquid would be a way. But we wanted the liquid to be stable instead of flowing everywhere.”
In SAC, tiny spheres of polyvinylidene fluoride (PVDF) encapsulate much of the liquid. The viscous polydimethylsiloxane (PDMS) further coats the entire surface. The spheres are extremely resilient, Lou said, as their thin shells deform easily. Their liquid contents enhance their viscoelasticity, a measure of their ability to absorb the strain and return to their original state, while the coatings keep the spheres together. The spheres also have the freedom to slide past each other when compressed, but remain attached.
“The sample doesn’t give you the impression that it contains any liquid,” Lou said. “That’s very different from a gel. This is not really squishy; it’s more like a sugar cube that you can compress quite a lot. The nice thing is that it recovers.”
Ajayan said making SAC is simple, and the process can be tuned – a little more liquid or a little more solid — to regulate the product’s mechanical behavior.
“Gels have lots of liquid encapsulated in solids, but they’re too much on the very soft side,” he said. “We wanted something that was mechanically robust as well. What we ended up with is probably an extreme gel in which the liquid phase is only 50 percent or so.”
The Latest on: Self-adaptive material
[google_news title=”” keyword=”self-adaptive material” num_posts=”10″ blurb_length=”0″ show_thumb=”left”]
via Google News
The Latest on: Self-adaptive material
- Adaptive Biotechnologies: A Post Earnings Assessmenton February 25, 2024 at 8:41 am
Today, we circle back on diagnostic concern Adaptive Biotechnologies Corporation, which recently posted its fourth quarter results. The company develops immune medicine platforms for the diagnosis and ...
- The Echo Show 8 is still the best smart display and speaker combo availableon February 21, 2024 at 12:04 pm
ZDNET's key takeawaysThe third-generation Echo Show 8 was launched for sale in late 2023 for $150.An improved speaker now boasts spatial audio, a centered camera, and the new Adaptive Content feature.
- I used Ford’s BlueCruise driver assistance on a road trip and I’m excited for self-drivingon February 20, 2024 at 11:10 am
However, in promo material, Ford advertises BlueCruise as “hands-off driving”. And that sounds a lot more like self-driving. So to try this out ... you get and advanced version of Adaptive Cruise ...
- A better model of early ed: City a leader in statewide push to create local networks of preschool careon February 15, 2024 at 3:58 pm
Five years into a project to expand access to early education, Northampton has become a prime mover in building partnerships among various providers in the field.“What’s happening in Northampton is ...
- Chrysler Halcyon Concept Debuts Self-Driving Tech That Makes Tesla Blushon February 13, 2024 at 3:00 am
Chrysler has revealed the Halcyon, a striking concept that previews the brand's all-electric future, autonomous driving, and "sustainably-driven" design for the exterior and interior.
- Super-lightweight Robot Friendly Modular Construction for Bridges and Space Colonizationon February 12, 2024 at 4:00 pm
and reconfigure the blocks into various structures Versatile programmable materials have long been envisioned that can reconfigure themselves to adapt to changing use cases in adaptive infrastructure, ...
- The 10 Best Medium-Firm Mattresses for 2024on February 8, 2024 at 3:59 pm
The adaptive foam is CertiPUR-US-certified for ... hypoallergenic Talalay latex material and has a supportive, zoned coil system. Latex is naturally temperature regulating, and Nolah added ...
- adaptive technologyon January 26, 2024 at 4:00 pm
Quite a few makers try and create devices helpful to others – today’s hack, Rocket Switch, is a lovely example of that. It’s a design by [Neil Squire] of [Makers Making Change], with a PCB ...
- Self-adaptive learning particle swarm optimization-based path planning of mobile robot using 2D Lidar environmenton January 25, 2024 at 4:00 pm
In the proposed work, the Lidar information is finetuned using binary occupancy grid approach and implemented Improved Self-Adaptive Learning Particle Swarm Optimization (ISALPSO) algorithm for path ...
- Make your garden accessible with these adaptive toolson May 16, 2023 at 12:25 pm
It’s that time of year again when the sun is out, the flowers are blooming, and everyone is ready to get back to work making their gardens grow. From pots on windowsills to expansive yards, every ...
via Bing News