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The 3-D printing technique for the material allows the creation of structural structures, including a top, imitating a graphite atomic gridCREDIT: Wong Lab / Brow University
Researchers at Brown University have demonstrated a way of using graphene oxide (GO) to form a spine made of alginate-made hydrogel material, a natural derived material that is currently used in biomedical applications. In a paper published in the journal Carbon, researchers describe a 3-D printing method that is complicated and persistent alginate-GO than structured and far-reaching fractures.
"The reduction of the use of alginate hydrogels is very fragile, usually falling over mechanical loads or low salts," said Thomas Valentin, Ph.D. from Brown's Engineering School. "What we have shown, including nanoscale oxide graphene, could be much more robust."
The material is also capable of responding to more or less chemical treatments, in order to be able to use "intelligent" material capable of reacting in real time. In addition, alginate-GO maintains the ability to leave oils with alginate as a new potential material as a sterile resin.
Materials known as stereolithography 3 D printing method. A technique is controlled by a computer-designed system through ultraviolet laser control in the polymer photo polymers solution. Light connects polymers together, forming a 3-D peaceful solution. The monitoring process is repeated when the entire object is built into layer layers from the bottom. In this case, the solution of the polymers is sodium alginate, mixed with graphene oxides, a carbon-based material, which consists of a single nano-coil, and is stronger than one kilogram-pound in steel.
The most advantageous technique is the use of sodium alginate polymers by ionic bonding. Links are enough to hold the material together, but they can be broken by chemical treatments. This allows you to respond dynamically to external stimuli. Previously, Brown researchers have shown that "ionic crosslinking" can be used to create alginate materials in demand degradation when they are treated with the chemistry that extracts internal material structures.
For this new study, the researchers saw how graphene oxides changed the mechanical structure of alginates. They have proved to be Alginate-GO's only algae, twice as much as cracking failures.
"It stabilizes the stability of the graphene oxide with the hydrogel hydrogel," said Ian Y. Wong, Brown's Assistant Professor of Engineering and Paper Secretary. "We believe that fractures are resistant to cracking around cracked graphene sheets, although they are homogeneous alga."
An extra rigidity was to print the structures that the researchers underwent, so that alginates were only impossible. Additionally, stiffness did not increase the response to external alginate-GO stimuli, just like alginate. Researchers have shown that bathing chemical materials are removed from the water, materials have become more and more softer. The materials regained their rigidity after bathing in ionic ions in water. According to the experiments, the rigidity of materials can be tuned through 500 factors, changing the external ionic environment.
Its ability to change its rigidity may be useful in alginate-GO in several applications, researchers say, including dynamic cell culture.
"After imagining a scenario of imagining imaginary solar cells, they would quickly change to a smoother environment to see how cells could respond," said Valentin. This can be useful if cancer cells or immune cells are migrated through different organs.
And because alginate-GO alginate pure oil retains potentially oil-resistant properties, new materials can make a good lid to keep oil and surfaces on the surfaces. In several experiments, the researchers may have contaminated the alginate-GO coat by penetrating the glass surface into low salt conditions. Therefore, coatings and structures used in marine environments by alginate-GO may be useful, researchers said.
"These composite materials could be used as a sensor in the ocean, as an anti-aging cover that can keep you reading or keep your housings clean," said Wong. Grafen's added rigidity would have a much more sustainable material or coatings than alginate.
Researchers intend to continue experimenting with new material to optimize productivity rationalization and their properties.
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