DOE News
    Doe Science news source
    The DOE Science News Source is a Newswise initiative to promote research news from the Office of Science of the DOE to the public and news media.
    • 2018-11-15 16:05:37
    • Article ID: 704104

    Self-Sensing Materials Are Here

    Next-generation composites may monitor their own structural health

    • Credit: Carlos Jones/Oak Ridge National Laboratory, U.S. Dept. of Energy

      From left, Amit Naskar, Ngoc Nguyen and Christopher Bowland in ORNL’s Carbon and Composites Group bring a new capability—structural health monitoring—to strong, lightweight materials promising for transportation applications. The spools contain fibers from various stages within the carbon fiber production process. Bottles contain neat epoxy resin (white) and nanoparticle-loaded epoxy (gray) in which fiber tows will be dipped and dried to create a thin coating on the fibers. Testing ten concentrations of nanoparticles on coated fiber, the researchers found an optimum concentration that increased mechanical strength and enhanced structural health monitoring sensitivity.

    • Credit: Christopher Bowland and Sherry Razo/Oak Ridge National Laboratory, U.S. Dept. of Energy

      Next-generation fiber-reinforced composites may be self-sensing and issue warnings about structural threats.

    • Credit: Carlos Jones/Oak Ridge National Laboratory, U.S. Dept. of Energy

      From left, Naskar, Bowland and Nguyen examined a cantilever made of fiber-reinforced composite with the fibers aligned in one direction and measured its electrical resistance in response to stress.

    • Credit: Carlos Jones/Oak Ridge National Laboratory, U.S. Dept. of Energy

      Bowland affixed electrodes on both sides of the cantilever. In a dynamic mechanical analyzer, he clamped one end to hold the beam stationary. The analyzer applied force at the other end to flex the cantilever 100 times. After every 10 flexes, strain was increased, and the electrical resistance was measured as a function of stress to quantify the structural health monitoring sensitivity.

    Carbon fiber composites—lightweight and strong—are great structural materials for automobiles, aircraft and other transportation vehicles. They consist of a polymer matrix, such as epoxy, into which reinforcing carbon fibers have been embedded. Because of differences in the mechanical properties of these two materials, the fibers can detach from the matrix under excessive stresses or fatigue. That means damage in carbon fiber composite structures can remain hidden below the surface, undetectable by visual inspection, potentially leading to catastrophic failure. 

    “Carbon fiber composites fail catastrophically, so you won’t see damage until the entire structure has failed,” said Chris Bowland, a Wigner Fellow at the Department of Energy’s Oak Ridge National Laboratory. “By knowing what’s going on within the composite, you can better judge its health and know if there is damage that needs to be repaired.”

    Recently, Bowland and Amit Naskar, leader of ORNL’s Carbon and Composites Group, invented a roll-to-roll process to coat electrically conductive carbon fibers with semiconducting silicon carbide nanoparticles. This nanomaterial-embedded composite is stronger than other fiber-reinforced composites and imbued with a new capability—the ability to monitor its own structural health.

    When enough coated fiber is embedded in a polymer, the fibers create an electrical network and the bulk composite becomes electrically conductive. The semiconducting nanoparticles can disrupt this electrical conductivity in response to applied forces, adding an electromechanical functionality to the composite.  

    If the composite is strained, the connectivity of the coated fibers is disrupted and the electrical resistance in the material changes. Should storm turbulence cause a composite airplane wing to flex, an electrical signal may warn the plane’s computer that the wing has endured excessive stress and prompt a recommendation for an inspection.

    ORNL’s roll-to-roll demonstration proved in principle that the method could be scaled up for high-volume production of coated fibers for next-generation composites. Self-sensing composites, perhaps made with a renewable polymer matrix and low-cost carbon fibers, could find themselves in ubiquitous products, even including 3D-printed vehicles and buildings.

    To fabricate nanoparticle-embedded fibers, the researchers loaded spools of high-performance carbon fiber onto rollers that dipped the fiber in epoxy loaded with commercially available nanoparticles about the width of a virus (45–65 nanometers). The fiber was then dried in an oven to set its coating.

    To test the strength with which nanoparticle-embedded fibers adhered to the polymer matrix, the researchers made fiber-reinforced composite beams with the fibers aligned in one direction. Bowland conducted stress tests in which both ends of this cantilever were fixed while a machine assessing mechanical performance pushed on the beam’s middle until it failed. To investigate the sensing capabilities of the composite, he affixed electrodes on both sides of the cantilever. In a machine called a “dynamic mechanical analyzer,” he clamped one end to hold the cantilever stationary. The machine applied force at the other end to flex the beam while Bowland monitored the change in electrical resistance. ORNL postdoctoral fellow Ngoc Nguyen conducted additional tests in a Fourier-transform infrared spectrometer to study chemical bonds within the composites and improve understanding of the enhanced mechanical strength that was observed. 

    The researchers also tested composites made with different amounts of nanoparticles for the ability to dissipate energy—as measured by vibration-damping behavior—a capability that would benefit structural materials subjected to impacts, shakes, and other sources of stress and strain. At every concentration, the nanoparticles enhanced energy dissipation (by 65 to 257 percent).

    Bowland and Naskar have applied for a patent for the process to make self-sensing carbon fiber composites.

    “Dip coating offers a new route to utilize novel nanomaterials under development,” Bowland said.

    ORNL's Laboratory Directed Research and Development Program supported the research, which is published in ACS Applied Materials & Interfaces, a journal of the American Chemical Society.

    The title of the paper is “Roll-to-Roll Processing of Silicon Carbide Nanoparticle-Deposited Carbon Fiber for Multifunctional Composites.”

    UT-Battelle manages ORNL for DOE's Office of Science. The single largest supporter of basic research in the physical sciences in the United States, the Office of Science is working to address some of the most pressing challenges of our time. For more information, please visit https://science.energy.gov/. —by Dawn Levy

    • other-fb
    • other-tw
    X
    X
    X
    • Filters

    • × Clear Filters
    CEBAF Turns on the Charm

    CEBAF Turns on the Charm

    The world's most advanced particle accelerator for investigating the quark structure of the atom's nucleus has just charmed physicists with a new capability. The production of charm quarks in J/ψ (J/psi) particles by CEBAF at the Department of Energy's Thomas Jefferson National Accelerator Facility confirms that the facility has expanded the realm of precision nuclear physics research with electron beams to higher energies.

    Fast-Moving Pairs May Solve 35-Year-Old Mystery

    Fast-Moving Pairs May Solve 35-Year-Old Mystery

    Physicists develop a universal mathematical description that suggests that proton-neutron pairs in a nucleus may explain why their associated quarks have lower average momenta than predicted.

    Artificial intelligence accelerates efforts to develop clean, virtually limitless fusion energy

    Artificial intelligence accelerates efforts to develop clean, virtually limitless fusion energy

    Feature describes Nature paper on opening a new chapter in fusion research with artificial intelligence.

    Team Takes Fluoride from Taps and Toothpaste to Batteries

    Team Takes Fluoride from Taps and Toothpaste to Batteries

    With user facilities, researchers devise novel battery chemistries to help make fluoride batteries a reality.

    Quarks Under Pressure in the Proton

    Quarks Under Pressure in the Proton

    Pressure in the middle of a proton is about 10 times higher than in a neutron star.

    Physicists Improve Understanding of Heat and Particle Flow in the Edge of a Fusion Device

    Physicists Improve Understanding of Heat and Particle Flow in the Edge of a Fusion Device

    PPPL physicists have discovered valuable information about how plasma flows at the edge inside doughnut-shaped fusion devices. The findings mark an encouraging sign for the development of machines to produce fusion energy for generating electricity without creating long-term hazardous waste.

    Magnetic Levitation of Ultracold Neutrons Yields New Measurement of the Neutron Lifetime

    Magnetic Levitation of Ultracold Neutrons Yields New Measurement of the Neutron Lifetime

    Storing extremely slow neutrons in a novel trap enables precise measurement of a basic property of particle physics.

    SLAC's High-Speed 'Electron Camera' Films Molecular Movie in HD

    SLAC's High-Speed 'Electron Camera' Films Molecular Movie in HD

    With an extremely fast "electron camera" at the Department of Energy's SLAC National Accelerator Laboratory, researchers have made the first high-definition "movie" of ring-shaped molecules breaking open in response to light. The results could further our understanding of similar reactions with vital roles in chemistry, such as the production of vitamin D in our bodies.

    New Molecular Blueprint Aids Study of Photosynthesis

    New Molecular Blueprint Aids Study of Photosynthesis

    Insights into how nature converts carbon dioxide into sugar could help scientists develop crops that produce fuels and other products.

    SLAC develops novel compact antenna for communicating where radios fail

    SLAC develops novel compact antenna for communicating where radios fail

    A new type of pocket-sized antenna, developed at the Department of Energy's SLAC National Accelerator Laboratory, could enable mobile communication in situations where conventional radios don't work, such as under water, through the ground and over very long distances through air.


    • Filters

    • × Clear Filters

    Department of Energy Announces $20 Million for Artificial Intelligence Research

    Today, the U.S. Department of Energy (DOE) announced a total of $20 million in funding for innovative research and development in artificial intelligence (A.I.) and machine learning.

    Tim Knewitz named Argonne National Laboratory's Chief Financial Officer

    Tim Knewitz named Argonne National Laboratory's Chief Financial Officer

    The U.S. Department of Energy's Argonne National Laboratory has named Tim Knewitz at its Chief Financial Officer.

    Department of Energy Announces $95 Million for Small Business Research and Development Grants

    U.S. Energy Secretary Rick Perry today announced that the Department of Energy will award 86 grants totaling $95 million to 74 small businesses in 21 states.

    DOE's Science Graduate Student Research Program Selects 70 Students to Pursue Research at DOE Laboratories

    The Department of Energy's (DOE's) Office of Science has selected 70 graduate students from across the nation for its 2018 Solicitation 2 cycle for Office of Science Graduate Student Research (SCGSR) Program.

    Brookhaven Joins the IBM Q Network Hub at Oak Ridge National Lab

    Brookhaven Joins the IBM Q Network Hub at Oak Ridge National Lab

    Brookhaven National Lab has joined the IBM Q Network Hub at Oak Ridge National Lab. This hub is part of an international community of Fortune 500 companies, startups, universities, and research labs working with IBM to advance quantum computing and explore its practical applications.

    David Reis named head of PULSE Institute for ultrafast science

    David Reis named head of PULSE Institute for ultrafast science

    Long before David Reis joined the faculty of the Department of Energy's SLAC National Accelerator Laboratory and Stanford University, he was helping lay the groundwork for the lab's first-of-a-kind X-ray free-electron laser, or XFEL, and the revolutionary science that followed its opening in 2009. Now he's director of the PULSE Institute, which was founded by SLAC and Stanford with the express purpose of exploiting the possibilities for ultrafast science at that X-ray laser, the Linac Coherent Light Source (LCLS).

    Head of NSTX-U research is appointed deputy director for research at the Princeton Plasma Physics Laboratory

    Head of NSTX-U research is appointed deputy director for research at the Princeton Plasma Physics Laboratory

    Jon Menard, the head of research on the Princeton Plasma Physics Laboratory's National Spherical Torus Experiment-Upgrade, has been named deputy director for research. Michael Zarnstorff, who held the position for 10 years, will become the chief chief scientist at PPPL, a position that will oversee strategic scientific planning.

    Argonne scientist advances energy sciences through professional leadership

    Argonne scientist advances energy sciences through professional leadership

    Ralph Muehleisen of the U.S. Department of Energy's (DOE) Argonne National Laboratory was recently re-elected to the Board of Directors of IBPSA-USA, the U.S. affiliate of the International Building Performance Simulation Association. IBPSA is a global leader in the promotion of building simulation science and one of the largest professional organizations in the world for building scientists and engineers.

    Brookhaven Lab Publishes Second Edition of Nuclear Nonproliferation Textbook

    Brookhaven Lab Publishes Second Edition of Nuclear Nonproliferation Textbook

    Brookhaven Lab has published the second edition of Deterring Nuclear Proliferation: The Importance of IAEA Safeguards, a textbook that provides a history of the origins of the International Atomic Energy Agency (IAEA) and introduces the ways in which IAEA verifies nation states' nuclear nonproliferation commitments.

    PPPL's Young Women's Conference Offers Girls Fun and Inspiration in STEM Fields

    PPPL's Young Women's Conference Offers Girls Fun and Inspiration in STEM Fields

    PPPL's Young Women's Conference in Science, Technology, Engineering and Mathematics on Friday, March 22, at Princeton University, seeks to change the statistics that show women still lag far behind men in the STEM fields. The conference offers 7th to 10th-grade girls hands-on science activities, exciting experiments, and talks and a keynote speech by early-career female scientists.


    • Filters

    • × Clear Filters
    Fast-Moving Pairs May Solve 35-Year-Old Mystery

    Fast-Moving Pairs May Solve 35-Year-Old Mystery

    Physicists develop a universal mathematical description that suggests that proton-neutron pairs in a nucleus may explain why their associated quarks have lower average momenta than predicted.

    Team Takes Fluoride from Taps and Toothpaste to Batteries

    Team Takes Fluoride from Taps and Toothpaste to Batteries

    With user facilities, researchers devise novel battery chemistries to help make fluoride batteries a reality.

    Quarks Under Pressure in the Proton

    Quarks Under Pressure in the Proton

    Pressure in the middle of a proton is about 10 times higher than in a neutron star.

    Magnetic Levitation of Ultracold Neutrons Yields New Measurement of the Neutron Lifetime

    Magnetic Levitation of Ultracold Neutrons Yields New Measurement of the Neutron Lifetime

    Storing extremely slow neutrons in a novel trap enables precise measurement of a basic property of particle physics.

    New Molecular Blueprint Aids Study of Photosynthesis

    New Molecular Blueprint Aids Study of Photosynthesis

    Insights into how nature converts carbon dioxide into sugar could help scientists develop crops that produce fuels and other products.

    Catching Fast Changes in Excited Molecules

    Catching Fast Changes in Excited Molecules

    Scientists observe and control molecular and atomic dynamics at the fastest timescales to date.

    Atomic Maps Reveal How Iron Rusts

    Atomic Maps Reveal How Iron Rusts

    Scientists discovered how iron atoms continually re-arrange on surfaces, offering insights into metal corrosion and soil remediation.

    Strain and Defects Grow in Tiny Magnetite Crystals When Oxidized

    Strain and Defects Grow in Tiny Magnetite Crystals When Oxidized

    Detailed 3D images show how nanoparticles change in reactions that purify contaminated water or power recyclable geochemical batteries.

    A New View on a Very Old Problem: Evolution of the Photochemical Reaction Centers

    A New View on a Very Old Problem: Evolution of the Photochemical Reaction Centers

    Researchers offer insights into how a key piece of photosynthetic machinery changed over 3 billion years.

    How Does Mother Nature Tackle the Tough Triple Bond Found in Nitrogen?

    How Does Mother Nature Tackle the Tough Triple Bond Found in Nitrogen?

    Researchers demystify how the nitrogenase enzyme breaks bonds to learn a better way to make ammonia.


    Spotlight

    DOE's Science Graduate Student Research Program Selects 70 Students to Pursue Research at DOE Laboratories
    Friday April 12, 2019, 03:05 PM

    DOE's Science Graduate Student Research Program Selects 70 Students to Pursue Research at DOE Laboratories

    Department of Energy, Office of Science

    Young Women's Conference in STEM seeks to change the statistics one girl at a time
    Thursday March 28, 2019, 03:05 PM

    Young Women's Conference in STEM seeks to change the statistics one girl at a time

    Princeton Plasma Physics Laboratory

    Students team with Argonne scientists and engineers to learn about STEM careers
    Tuesday March 12, 2019, 05:05 PM

    Students team with Argonne scientists and engineers to learn about STEM careers

    Argonne National Laboratory

    Lynbrook High wins 2019 SLAC Regional Science Bowl competition
    Wednesday February 13, 2019, 02:05 PM

    Lynbrook High wins 2019 SLAC Regional Science Bowl competition

    SLAC National Accelerator Laboratory

    Equipping the next generation for a technological revolution
    Thursday January 24, 2019, 01:05 PM

    Equipping the next generation for a technological revolution

    Argonne National Laboratory

    Chemistry intern inspired by Argonne's real-world science
    Friday January 18, 2019, 05:05 PM

    Chemistry intern inspired by Argonne's real-world science

    Argonne National Laboratory

    Chasing a supernova
    Friday January 18, 2019, 04:05 PM

    Chasing a supernova

    Argonne National Laboratory

    Argonne intern streamlines the beamline
    Tuesday January 08, 2019, 02:05 PM

    Argonne intern streamlines the beamline

    Argonne National Laboratory

    Research on Light-Matter Interaction Could Lead to Improved Electronic and Optoelectronic Devices
    Thursday October 11, 2018, 04:00 PM

    Research on Light-Matter Interaction Could Lead to Improved Electronic and Optoelectronic Devices

    Rensselaer Polytechnic Institute (RPI)

    Innovating Our Energy Future
    Wednesday October 03, 2018, 07:05 PM

    Innovating Our Energy Future

    Oregon State University, College of Engineering

    Physics graduate student takes her thesis research to a Department of Energy national lab
    Tuesday October 02, 2018, 03:05 PM

    Physics graduate student takes her thesis research to a Department of Energy national lab

    University of Alabama at Birmingham

    Friday September 21, 2018, 01:05 PM

    "Model" students enjoy Argonne campus life

    Argonne National Laboratory

    Writing Code for a More Skilled and Diverse STEM Workforce
    Thursday September 06, 2018, 01:05 PM

    Writing Code for a More Skilled and Diverse STEM Workforce

    Brookhaven National Laboratory

    New graduate student summer school launches at Princeton Plasma Physics Laboratory
    Tuesday September 04, 2018, 11:30 AM

    New graduate student summer school launches at Princeton Plasma Physics Laboratory

    Princeton Plasma Physics Laboratory

    The Gridlock State
    Friday August 31, 2018, 06:05 PM

    The Gridlock State

    California State University (CSU) Chancellor's Office

    Meet Jasmine Hatcher and Trishelle Copeland-Johnson
    Friday August 31, 2018, 02:05 PM

    Meet Jasmine Hatcher and Trishelle Copeland-Johnson

    Brookhaven National Laboratory

    Argonne hosts Modeling, Experimentation and Validation Summer School
    Friday August 24, 2018, 11:05 AM

    Argonne hosts Modeling, Experimentation and Validation Summer School

    Argonne National Laboratory

    Students affected by Hurricane Maria bring their research to SLAC
    Wednesday August 22, 2018, 01:05 PM

    Students affected by Hurricane Maria bring their research to SLAC

    SLAC National Accelerator Laboratory

    Brookhaven Lab Pays Tribute to 2018 Summer Interns
    Wednesday August 22, 2018, 10:05 AM

    Brookhaven Lab Pays Tribute to 2018 Summer Interns

    Brookhaven National Laboratory

    Changing How Buildings Are Made
    Monday August 20, 2018, 12:05 PM

    Changing How Buildings Are Made

    Washington University in St. Louis

    CSUMB Selected to Host Architecture at Zero Competition in 2019
    Thursday August 16, 2018, 12:05 PM

    CSUMB Selected to Host Architecture at Zero Competition in 2019

    California State University, Monterey Bay

    Department of Energy Invests $64 Million in Advanced Nuclear Technology
    Friday July 20, 2018, 03:00 PM

    Department of Energy Invests $64 Million in Advanced Nuclear Technology

    Rensselaer Polytechnic Institute (RPI)

    Professor Miao Yu Named the Priti and Mukesh Chatter '82 Career Development Professor
    Thursday July 19, 2018, 05:00 PM

    Professor Miao Yu Named the Priti and Mukesh Chatter '82 Career Development Professor

    Rensselaer Polytechnic Institute (RPI)

    2018 RHIC & AGS Annual Users' Meeting: 'Illuminating the QCD Landscape'
    Tuesday July 03, 2018, 11:05 AM

    2018 RHIC & AGS Annual Users' Meeting: 'Illuminating the QCD Landscape'

    Brookhaven National Laboratory

    Argonne welcomes <em>The Martian</em> author Andy Weir
    Friday June 29, 2018, 06:05 PM

    Argonne welcomes The Martian author Andy Weir

    Argonne National Laboratory

    Creating STEM Knowledge and Innovations to Solve Global Issues Like Water, Food, and Energy
    Monday June 18, 2018, 09:55 AM

    Creating STEM Knowledge and Innovations to Solve Global Issues Like Water, Food, and Energy

    Illinois Mathematics and Science Academy (IMSA)

    Professor Emily Liu Receives $1.8 Million DoE Award for Solar Power Systems Research
    Friday June 15, 2018, 10:00 AM

    Professor Emily Liu Receives $1.8 Million DoE Award for Solar Power Systems Research

    Rensselaer Polytechnic Institute (RPI)

    Celebrating 40 years of empowerment in science
    Thursday June 07, 2018, 03:05 PM

    Celebrating 40 years of empowerment in science

    Argonne National Laboratory

    Introducing Graduate Students Across the Globe to Photon Science
    Monday May 07, 2018, 10:30 AM

    Introducing Graduate Students Across the Globe to Photon Science

    Brookhaven National Laboratory

    Students from Massachusetts and Washington Win DOE's 28th National Science Bowl(r)
    Wednesday May 02, 2018, 04:05 PM

    Students from Massachusetts and Washington Win DOE's 28th National Science Bowl(r)

    Department of Energy, Office of Science

    The Race for Young Scientific Minds
    Thursday April 12, 2018, 07:05 PM

    The Race for Young Scientific Minds

    Argonne National Laboratory

    Q&A: Al Ashley Reflects on His Efforts to Diversify SLAC and Beyond
    Wednesday March 14, 2018, 02:05 PM

    Q&A: Al Ashley Reflects on His Efforts to Diversify SLAC and Beyond

    SLAC National Accelerator Laboratory

    Insights on Innovation in Energy, Humanitarian Aid Highlight UVA Darden's Net Impact Week
    Thursday February 15, 2018, 12:05 PM

    Insights on Innovation in Energy, Humanitarian Aid Highlight UVA Darden's Net Impact Week

    University of Virginia Darden School of Business

    Ivy League Graduate, Writer and Activist with Dyslexia Visits CSUCI to Reframe the Concept of Learning Disabilities
    Friday February 09, 2018, 11:05 AM

    Ivy League Graduate, Writer and Activist with Dyslexia Visits CSUCI to Reframe the Concept of Learning Disabilities

    California State University, Channel Islands

    Photographer Adam Nadel Selected as Fermilab's New Artist-in-Residence for 2018
    Wednesday January 17, 2018, 12:05 PM

    Photographer Adam Nadel Selected as Fermilab's New Artist-in-Residence for 2018

    Fermi National Accelerator Laboratory (Fermilab)

    Fermilab Computing Partners with Argonne, Local Schools for Hour of Code
    Wednesday January 17, 2018, 12:05 PM

    Fermilab Computing Partners with Argonne, Local Schools for Hour of Code

    Fermi National Accelerator Laboratory (Fermilab)

    Q&A: Sam Webb Teaches X-Ray Science from a Remote Classroom
    Wednesday December 20, 2017, 01:05 PM

    Q&A: Sam Webb Teaches X-Ray Science from a Remote Classroom

    SLAC National Accelerator Laboratory

    The Future of Today's Electric Power Systems
    Monday December 18, 2017, 01:05 PM

    The Future of Today's Electric Power Systems

    Rensselaer Polytechnic Institute (RPI)

    Supporting the Development of Offshore Wind Power Plants
    Monday December 18, 2017, 12:05 PM

    Supporting the Development of Offshore Wind Power Plants

    Rensselaer Polytechnic Institute (RPI)

    Stairway to Science
    Tuesday October 03, 2017, 01:05 PM

    Stairway to Science

    Argonne National Laboratory

    After-School Energy Rush
    Thursday September 28, 2017, 12:05 PM

    After-School Energy Rush

    Argonne National Laboratory

    Bringing Diversity Into Computational Science Through Student Outreach
    Thursday September 28, 2017, 10:05 AM

    Bringing Diversity Into Computational Science Through Student Outreach

    Brookhaven National Laboratory

    From Science to Finance: SLAC Summer Interns Forge New Paths in STEM
    Thursday September 21, 2017, 03:05 PM

    From Science to Finance: SLAC Summer Interns Forge New Paths in STEM

    SLAC National Accelerator Laboratory

    Students Discuss 'Cosmic Opportunities' at 45th Annual SLAC Summer Institute
    Thursday September 07, 2017, 02:05 PM

    Students Discuss 'Cosmic Opportunities' at 45th Annual SLAC Summer Institute

    SLAC National Accelerator Laboratory

    Binghamton University Opens $70 Million Smart Energy Building
    Thursday August 31, 2017, 05:05 PM

    Binghamton University Opens $70 Million Smart Energy Building

    Binghamton University, State University of New York

    Widening Horizons for High Schoolers with Code
    Wednesday August 23, 2017, 05:05 PM

    Widening Horizons for High Schoolers with Code

    Argonne National Laboratory





    Showing results

    0-4 Of 2215