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    • 2020-01-10 12:00:49
    • Article ID: 724998

    Nano-objects of Desire: Assembling Ordered Nanostructures in 3-D

    Using shape-programmable DNA frames, scientists established a new nanofabrication platform for directing nanomaterial components of different natures (inorganic and biological) into 3-D arrays with prescribed organizations; they then demonstrated the enhanced optical and catalytic functionalities possible with this platform

    • Credit: Brookhaven National Laboratory

      A schematic of the programmable assembly of 3-D ordered nanostructures from material voxels that can carry inorganic or organic nanoparticles with different functions, such as light emitters and absorbers, proteins, and enzymes with chemical activity. Material voxels are fabricated from DNA and nano-objects of different kinds, and their assembly is guided by the voxel design and DNA-programmable interactions.

    • Credit: Nature Materials

      Schematic of the platform for assembling 3-D lattices from inorganic and organic nano-objects with DNA frames shaped as a tetrahedron (top row), octahedron (middle row), and cube (bottom row). The frame valence is determined by the vertices and corresponds to the number of connections (bonds) and how these connections are organized relative to one another. For example, the tetrahedral frame has a valence of four. The resulting 3-D lattices are based on the shape of the DNA frame—tetrahedral frames assemble into diamond structures, octahedral into simple cubic, and cubic into body-centered cubic—regardless of which nano-object (if any) is inside the frame.

    • Credit: Nature Materials

      Fluorescence microscope images of the lattice assembled from octahedron-shaped material voxels containing quantum dots of two different colors (fluorescence emissions of either 525 or 705 nanometers). The different colors correspond to different wavelengths. The uniform coloring in all images indicates a perfect mixing of quantum dots at subwavelength length scales.

    • Credit: Columbia Engineering

      Columbia PhD student Yan Xiong, Columbia Engineering professor Sanat Kumar, Columbia postdoc Jason Kahn, Brookhaven Lab scientist and Columbia Engineering professor Oleg Gang, and Columbia PhD student Brian Minevich in the Soft Matter Lab of the Fu Foundation School of Engineering and Applied Science at Columbia University. Here, they made and partially characterized various optical and enzymatic materials to demonstrate a new nanofabrication platform. The team—which also includes Brookhaven Lab scientists Ye Tian, Julien Lhermitte, Huolin Xin, Kevin Yager, Ruipeng Li, and Masafumi Fukuto—performed the other characterizations at Brookhaven's Center for Functional Nanomaterials and National Synchrotron Light Source II.

    UPTON, NY—Scientists have developed a platform for assembling nanosized material components, or “nano-objects,” of very different types—inorganic or organic—into desired 3-D structures. Though self-assembly (SA) has successfully been used to organize nanomaterials of several kinds, the process has been extremely system-specific, generating different structures based on the intrinsic properties of the materials. As reported in a paper published today in Nature Materials, their new DNA-programmable nanofabrication platform can be applied to organize a variety of 3-D materials in the same prescribed ways at the nanoscale (billionths of a meter), where unique optical, chemical, and other properties emerge.

    “One of the major reasons why SA is not a technique of choice for practical applications is that the same SA process cannot be applied across a broad range of materials to create identical 3-D ordered arrays from different nanocomponents,” explained corresponding author Oleg Gang, leader of the Soft and Bio Nanomaterials Group at the Center for Functional Nanomaterials (CFN)—a U.S. Department of Energy (DOE) Office of Science User Facility at Brookhaven National Laboratory—and a professor of Chemical Engineering and of Applied Physics and Materials Science at Columbia Engineering. “Here, we decoupled the SA process from material properties by designing rigid polyhedral DNA frames that can encapsulate various inorganic or organic nano-objects, including metals, semiconductors, and even proteins and enzymes.”

    The scientists engineered synthetic DNA frames in the shape of a cube, octahedron, and tetrahedron. Inside the frames are DNA “arms” that only nano-objects with the complementary DNA sequence can bind to. These material voxels—the integration of the DNA frame and nano-object—are the building blocks from which macroscale 3-D structures can be made. The frames connect to each other regardless of what kind of nano-object is inside (or not) according to the complementary sequences they are encoded with at their vertices. Depending on their shape, frames have a different number of vertices and thus form entirely different structures. Any nano-objects hosted inside the frames take on that specific frame structure.

    To demonstrate their assembly approach, the scientists selected metallic (gold) and semiconducting (cadmium selenide) nanoparticles and a bacterial protein (streptavidin) as the inorganic and organic nano-objects to be placed inside the DNA frames. First, they confirmed the integrity of the DNA frames and formation of material voxels by imaging with electron microscopes at the CFN Electron Microscopy Facilityand the Van Andel Institute, which has a suite of instruments that operate at cryogenic temperatures for biological samples. They then probed the 3-D lattice structures at the Coherent Hard X-ray Scattering and Complex Materials Scattering beamlines of the National Synchrotron Light Source II (NSLS-II)—another DOE Office of Science User Facility at Brookhaven Lab. Columbia Engineering Bykhovsky Professor of Chemical Engineering Sanat Kumar and his group performed computational modeling revealing that the experimentally observed lattice structures (based on the x-ray scattering patterns) were the most thermodynamically stable ones that the material voxels could form.

    “These material voxels allow us to begin to use ideas derived from atoms (and molecules) and the crystals that they form, and port this vast knowledge and database to systems of interest at the nanoscale,” explained Kumar.

    Gang’s students at Columbia then demonstrated how the assembly platform could be used to drive the organization of two different kinds of materials with chemical and optical functions. In one case, they co-assembled two enzymes, creating 3-D arrays with a high packing density. Though the enzymes remained chemically unchanged, they showed about a fourfold increase in enzymatic activity. These “nanoreactors” could be used to manipulate cascade reactions and enable the fabrication of chemically active materials. For the optical material demonstration, they mixed two different colors of quantum dots—tiny nanocrystals that are being used to make television displays with high color saturation and brightness. Images captured with a fluorescence microscope showed that the formed lattice maintained color purity below the diffraction limit (wavelength) of light; this property could allow for significant resolution improvement in various display and optical communication technologies.

    “We need to rethink how materials can be formed and how they function,” said Gang. “Material redesign may not be necessary; simply packaging existing materials in new ways could enhance their properties. Potentially, our platform could be an enabling technology ‘beyond 3-D printing manufacturing’ to control materials at much smaller scales and with greater material variety and designed compositions. Using the same approach to form 3-D lattices from desired nano-objects of different material classes, integrating those that would otherwise be considered incompatible, could revolutionize nanomanufacturing.”  

    Brookhaven National Laboratory

    Brookhaven National Laboratory is supported by the U.S. Department of Energy’s Office of Science. The Office of Science is the single largest supporter of basic research in the physical sciences in the United States and is working to address some of the most pressing challenges of our time. For more information, visit https://energy.gov/science.

    Follow @BrookhavenLab on Twitter or find us on Facebook.

    Columbia Engineering

    Columbia Engineering, based in New York City, is one of the top engineering schools in the U.S. and one of the oldest in the nation. Also known as The Fu Foundation School of Engineering and Applied Science, the School expands knowledge and advances technology through the pioneering research of its more than 220 faculty, while educating undergraduate and graduate students in a collaborative environment to become leaders informed by a firm foundation in engineering. The School’s faculty are at the center of the University’s cross-disciplinary research, contributing to the Data Science Institute, Earth Institute, Zuckerman Mind Brain Behavior Institute, Precision Medicine Initiative, and the Columbia Nano Initiative. Guided by its strategic vision, “Columbia Engineering for Humanity,” the School aims to translate ideas into innovations that foster a sustainable, healthy, secure, connected, and creative humanity.

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