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According to foreign media reports, scientists have created a new kind of particle whose diameter is only one-hundred and one-hundredth of that of human hair, and spontaneously fuses into similar particle structures derived from atoms. Once assembled or "self-assembled," they will create a structure that has never been seen before. This structure can be used in optical materials and ceramic products.
It is understood that from the New York University, the Harvard School of Engineering & Applied Sciences, the Harvard Department of Physics, and the Dow Chemical Company The relevant personnel formed a research team to develop the particles.
The method focuses on the fusion of colloids suspended in liquid medium. The colloidal dispersion system constitutes a variety of items in people's daily life, such as paint, milk, gel, glass, and ceramics. However, scientists say that colloids can also constitute many other items, but it has not yet been developed.
Previously, scientists have successfully used colloids to create primary structures, but the use of colloids to design and assemble complex 3D structures has been limited. Part of the limitation is due to the lack of directional adhesives, which can effectively control the self-assembly of the particles and improve the complexity of the colloidal products while maintaining their structural integrity. The assembly materials such as atoms and molecules are very common in the nature as building blocks, but colloids are rarely used as the main material.
According to one of the co-authors of the project, Marcus Weck, a professor of chemistry at New York University, said: "Our method of creating particles actually uses nature's properties of atoms in the field of colloids. â€
And Vinothan Manoharan, an associate professor from Harvard University's Chemical Engineering and Physics at Harvard, said: "The chemists have a set of atomic periodicals for their synthesis of molecules and crystals. It's time to choose to use. We want to develop a particle that is similar to building materials and can create larger molecules and crystals."
In the development of colloids with such properties, researchers designed chemical “patches†that can form directional adhesives so that when assembling 3D lattices there is no need to worry about the particles not being tightly linked, which is a lot of advanced Material is a very important design. Because there is no directional adhesive, these structures are very unstable.
The great thing about this experiment is that scientists use a single strand of DNA to create a binding ability in a chemical “patchâ€. It is understood that this single strand of DNA corresponds to the "sticky end" that binds the chemical "patch".
According to David Pine, professor of physics at New York University, “This means that we can only rely on this chemical patch to create particles, and then we can program these particles to design only those chemical patches. The special particle species. This gives us great flexibility in designing 3D structures."
The researchers also stated that the DNA interactions in the chemical “patches†are unique, which means that the colloids they create also have different properties, sizes, colors, chemical functions, or conductive properties, and this creates new ones. s material. Such as 3D wired grid or photonic crystal, they will strengthen the characteristics of some of the consumer products of optical display, but also will increase the speed of the computer chip. (Shang Li)
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