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    Home > Chemicals Industry > New Chemical Materials > Columbia University engineers use DNA nanotechnology to create tough 3D nanomaterials

    Columbia University engineers use DNA nanotechnology to create tough 3D nanomaterials

    • Last Update: 2021-10-15
    • Source: Internet
    • Author: User
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    According to foreign media reports, Columbia University engineers have used DNA nanotechnology to create highly elastic synthetic nanoparticle materials that can be processed by traditional nanofabrication methods
    .
    Researchers from the Department of Engineering at Columbia University collaborated with Brookhaven National Laboratory and reported on Friday that they have established a nanoparticle-based 3D material designed to withstand vacuum, high temperature, high pressure, and high radiation
    .
    This new manufacturing process brings a solid and fully engineered nano-scale framework that can not only accommodate various functional nano-particle types, but also can be quickly processed using traditional nano-processing methods
    .
    ? "These self-assembled nanoparticles-based materials are so elastic that they can fly in space," said Oleg Gang, a professor of chemical engineering and applied physics and materials science, who led the report on March 19 in Science Research published in Advances
    .
    "We were able to transition the 3D DNA-nanoparticle architecture from a liquid-and from being a flexible material-to a solid state, in which silica reinforces the DNA pillars
    .
    This new material completely preserves the DNA-nanoparticle crystals.
    The original frame structure of the grid basically creates a 3D inorganic replica
    .
    This allows us to explore for the first time-how these nanomaterials can resist harsh conditions, how they are formed, and what are their characteristics
    .
    " Nanoscale The material properties are different.
    Researchers have long been exploring how to use these tiny materials—the thickness of a human hair is 1/1000 to 1/10000—for various applications, from sensors for making mobile phones to Make faster chips for notebook computers
    .
    However, in terms of realizing 3D nano-architecture, manufacturing technology has always been challenging
    .
    DNA nanotechnology can create complex tissue materials from nanoparticles through self-assembly, but given the softness of DNA and its dependence on the environment, this material may only be stable under limited conditions
    .
    In contrast, the newly formed materials can be widely used in applications that require these engineering structures
    .
    Traditional nanofabrication techniques are good at making planar structures, while Gang's new method can make 3D nanomaterials, which are essential for many electronic, optical and energy applications
    .
    Gang is the leader of the soft and bio-nanomaterials group of the Functional Nanomaterials Center at Brookhaven National Laboratory.
    He is a leader in DNA nanotechnology, which relies on folding DNA strands into the required two- and three-dimensional nanostructures
    .
    These nanostructures become building blocks, which can be programmed through Watson-Crick interaction and self-assemble into a three-dimensional structure
    .
    His group designs and forms these DNA nanostructures, integrates them with nanoparticles, and guides the assembly of target materials based on nanoparticles
    .
    And now, with this new technology, the team can transition these materials from soft and fragile to strong and durable
    .
    This new study demonstrates an effective method to transform 3D DNA-nanoparticle lattices into silica replicas, while maintaining the topological structure of the connections between particles and the integrity of the nanoparticle organization through DNA pillars
    .
    The reason why silica works well is that it helps to retain the nanostructure of the parent DNA lattice, forming a robust mold of the underlying DNA, and does not affect the arrangement of nanoparticles
    .
    "The DNA in this lattice has the properties of silica," said Aaron Michelson, a doctoral student in Gang's research group
    .
    "It becomes stable in the air, and can be dried, and for the first time 3D nano-level analysis of materials in real space
    .
    In addition, silica provides strength and chemical stability, its cost is very low, and can be based on needs.
    Make modifications-this is a very convenient material
    .
    " In order to learn more about the properties of their nanostructures, the team exposed the DNA-nanoparticle lattice converted to silica to extreme conditions: more than 10,000 High temperature in degrees Celsius and high mechanical stress exceeding 8 GPa (about 80,000 times the atmospheric pressure, or 80 times the Mariana Trench, the deepest trench in the world), and study these processes in situ
    .
    In order to measure the application feasibility of these structures and further processing steps, the researchers also exposed them to high doses of radiation and focused ion beams
    .
    "Our analysis of the applicability of these structures in coupling with traditional nanofabrication technologies shows that a truly powerful platform for generating elastic nanomaterials through DNA-based methods to discover their new properties," Gang pointed out
    .
    "This is a big step forward, because these specific characteristics mean that we can use our 3D nanomaterial assembly and still use all the traditional material processing steps
    .
    This integration of new and traditional nanofabrication methods It is needed to achieve advancements in mechanics, electronics, protons, photonics, superconductivity, and energy materials
    .
    " Collaboration based on Gang’s work has led to novel superconductivity and the conversion of silicon dioxide into conductive and semiconducting media.
    For further processing
    .
    These studies include a study published earlier in Nature Communications and a study recently published in Nano Communications
    .
    The researchers also plan to modify the structure to produce a wide range of materials with very desirable mechanical and optical properties
    .
    "Silicon for computers has been manufactured for more than 40 years," Gang added
    .
    "It took 40 years to push the manufacture of planar structures and equipment to around 10 nanometers
    .
    Now, we can make and assemble nano-objects in test tubes without expensive tools, just a few hours
    .
    Now, on a lattice The 8 billion connections can be coordinated and self-assembled through nano-scale processes that we can design
    .
    Each connection can be a transistor, a sensor or a light emitter-each connection can be a bit of data storage
    .
    Although Moore The development speed of the law is slowing down, but the programmability of DNA assembly methods can take us forward to solve the problems of new materials and nano-manufacturing
    .
    Although this is extremely challenging for the current methods, it is very challenging for the current methods.
    But it is very important for emerging technologies
    .
    "
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