In the eyes of ordinary people, sand grains and nanoparticles may be small particles that are too small to be seen by the naked eye. However, a group of scientists from the United States have been inspired by the sand castles and sand sculptures common in the sea. A new way of combining nanoparticles.
The study, from North Carolina State University and the University of North Carolina at Chapel Hill, found that magnetic nanoparticles can wrap themselves in a layer of oil "coating" and can be combined in the water through a unique capillary "bridge." Form a specific nanoparticle chain. These chains are extremely sensitive to temperature: when the temperature is lowered from 45 degrees Celsius to 15 degrees Celsius, the chains between these nanoparticles become brittle and then break, and the nanoparticles are dispersed; if the temperature is raised again and applied With a certain external magnetic field, these chains will magically form again.
Orlin Willef, a professor of chemical and biomolecular science at North Carolina State University, who explained the study, explained that the process was like using sand to make sandcastles and sand sculptures. By adding a certain proportion of water to the sand, the fine sand particles can be combined to give them a certain degree of plasticity. The same is true for nanoparticles. Since oil and water do not fuse, nanoparticles that are in the water "coat" in the water can be joined by capillary bridges. The external magnetic field controls these nanochains and grows in the direction the scientists envision.
In other words, this material responds to changes in temperature with some flexibility and flexibility. Willow says the technology allows for flexible and controlled connections between nanoparticles in liquids, and it is expected in the future to develop miniature robots with flexible joints or gels with magnetic and self-healing properties. Related papers were published in the recently published journal Nature Materials.
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