1 / 32

Nano-Impact

Nano-Impact. Jonathan P. Rothstein and Mark Tuominen. Making a Better Bulletproof Vest. A group of researchers at Univ. Del. have impregnated Kevlar vests with a nanoparticle colloidal suspension resulting in a dramatic improvement in projectile impact.

cdowning
Download Presentation

Nano-Impact

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Nano-Impact Jonathan P. Rothstein and Mark Tuominen

  2. Making a Better Bulletproof Vest • A group of researchers at Univ. Del. have impregnated Kevlar vests with a nanoparticle colloidal suspension resulting in a dramatic improvement in projectile impact. • The addition of a very small amount of fluid increased performance equivalent to doubling the number of Kevlar sheets while not changing flexibility of fabric. Why? Kevlar & Nanoparticle Suspension Kevlar Lee, Wetzel and Wagner J. Material Science (2003)

  3. Making a Better Bulletproof Vest • A group of researchers at Univ. Del. have impregnated Kevlar vests with a nanoparticle colloidal suspension resulting in a dramatic improvement in projectile impact. • The addition of a very small amount of fluid increased performance equivalent to doubling the number of Kevlar sheets while not changing flexibility of fabric. Why? Kevlar & Nanoparticle Suspension Kevlar http://www.ccm.udel.edu/STF/images1.html

  4. Nanoparticle Suspensions • The nanoparticle (d = 13nm) suspensions are shear thickening – the faster you shear or stretch them more viscous (thick) they become. • The dramatic increase in viscosity dissipates energy as the Kevlar fibers are pulled out by the impact of the bullets. Increasing Stretch Rate

  5. Why Size Matters 1mm Particles 100nm Particles • For large particles the fluid remains Newtonian like air or water below 30wt% • Above 30% interactions between and collisions of particles result shear thickening and elastic effects – particles interact to form large aggregate structures • For nanoparticles, the effect of nanoparticle addition can be observed at concentrations closer to 1wt% - why? • Surface area increases with reduced particle size resulting in enhanced interparticle interactions • At same volume fraction smaller particles are packed closer together – electrostatic interactions are stronger and diffusion is faster so they interact more frequently. 10nm Particles

  6. Copying Nature – Biomimetic Superhydrophobic Surfaces • The leaves of the lotus plant are superhydrophobic – water beads up on the surface of the plant and moves freely with almost no resistance making the leaves self-cleaning. • The surface of the lotus leaf has 10mm sized bumps which are coated by 1nm sized waxy crystals which make the surface extremely hydrophobic - repel water. • The water does not wet the entire surface of the leaf, but only the tops of the large scale roughness. • Synthetic superhydrophobic surfaces have designed to produce stain-resistant clothing and coatings for buildings and windows to make them self-cleaning. Water Drops on a Lotus Leaf

  7. Drop Motion on a Superhydrophobic Surfaces • Droplets don’t wet, but roll down superhydrophobic surfaces. • Water-based stains don’t adsorb. • Dirt is picked up by rolling drop as it moves. Dirt Superhydrophobic Surface

  8. d w Using Superhydrophobic Surfaces to Reduce Drag • We are currently using superhydrophobic surfaces to develop a passive, inexpensive technique that can generate drag reduction in both laminar and turbulent flows. • This technology could have a significant impact on applications from microfluidics and nanofluidics to submarines and surface ships. • How does it work? The water touches only the tops of the post and a shear-free air-water interfaces is supported – effectively reducing the surface area. • Currently capable of reducing drag by over 70% in both laminar and turbulent flows! Carbon Nanotubes PDMS 15μm

  9. The GENMAR GEORGE T (Japan Universal Shipbuilding, Tsu shipyard) Can These Surfaces Have a Real Impact? • Current Energy Resources – Fossil Fuels • Increasing scarcity • Increasing cost • Dangerous to maintain security • Ocean-going vessels accounted for 72% of all U.S. imports in 2006 • Technology could be employed to make ships more efficient or faster • Friction drag accounts for 90% of total drag experienced by a slow moving vessel • A 25% reduction in friction drag on a typical Suezmax Crude Carrier could… • Save $5,500 USD / day in #6 fuel oil • Prevent 43 metric tons of CO2 from entering the atmosphere each day 60μm

  10. Why Size Matters • To support larger and larger pressures and pressure drops, the spacing of the roughness on the ultrahydrophobic surfaces must be reduced into the nanoscale. • Currently developing processing techniques for large area nanofabrication of superhydrophobic surfaces with precise patterns of surface roughness. • Roll-to-roll nano-imprint lithography – a cutting edge tool. Coating Module Supply Drive Module Imprinting Module Receive Drive Module

  11. Why Roll-to-Roll Nanoimprint Lithography • Roll-to-roll technology will enable fabrication of nanostructured materials and devices by a simple, rapid, high volume, cost-effective platform. • Current cost of nanofabrication is $25,000/m2 • This technology capable of pushing it to $25/m2 • Will help address many of the challenges facing society. Coating Module Supply Drive Module

  12. Challenges facing society • Water • Energy • Health • Sustainable development • Environment • Knowledge • Economy

  13. Global Grand Challenges 2008 NAE Grand Challenges

  14. nano.gov

  15. Top Program Areas of the NNI for 2011 Fundamental nanoscale phenomena and processes Nanomaterials Nanoscale devices and systems Instrumentation research, metrology, and standards Nanomanufacturing Major research facilities and instrumentation Environment, health and safety Education and societal dimensions 484M 342M 402M 77M 101M 203M 117M 35M

  16. Important Strides in Nano Environmental, Health and Safety NIOSH: "Approaches to Safe Nanotechnology" • Emphasizing effective control banding • Now an ISO standard NIH: Nano Health Enterprise Initiative DuPont/EDF: Nano Risk Framework ACS: Lab Safety Guidelines For Handling Nanomaterials Lockheed-Martin: Enterprise-wide Procedure for Environmental, Safety and Health Management of Nanomaterials

  17. NSF Centers Dedicated to Nano EHS • University of California Center for the Environmental Implications of NanoTechnology • Duke Center for the Environmental Implications of NanoTechnology (CEINT) • Rice University Center for Biological and Environmental Nanotechnology • Components within other centers Other Federal EHS Activities • National Institute for Environmental Health Science • NIH Nanomaterials Characterization Laboratory • NIOSH • EPA • FDA Industrial EHS Testing

  18. Standards: ISO TC 229 • Terminology and Nomenclature • Measurement • Safety • Materials Specifications

  19. Nanomanufacturing - the essential link between laboratory innovations and nanotechnology products.

  20. Nanomanufacturing • Processes must work at a commercially relevant scale • Cost is a key factor • Must be reproducible and reliable • EHS under control • Nanomanufacturing includes top-down and bottom-up techniques, and integration of both • Must form part of a value chain

  21. Past 10 years: Major Accomplishments in Synthesis, Assembly and Processing (Nanomanufacturing) • • CNT-based transparent conducting electrodes - replaces indium tin oxide for displays and solar cells • Synthetic processes of monodisperse nanoparticles with designer surface ligands - impacts many applications • Block copolymer nanoscale patterning - utilization of molecular self-assembly for magnetic data storage and other applications • Self-alignment processes - utilizes natural interactions for nanoscale integration; enabling roll-to-roll processing

  22. Past 10 years: Major Accomplishments in Synthesis, Assembly and Processing (Nanomanufacturing) -- cont. • • Scalable processes for carbon nanotubes and graphene - impacts many applications • • Plasmonic lithography - produce smaller critical dimensions by beating far-field diffraction limitations • Use of bulk metallic glass materials for nanoscale molding - masters for nanoimprint lithography; curved surfaces

  23. Nanomanufacturing Enterprise Workforce Tools Metrology EHS NanoMFG Processes Materials Information (Science-based) Standards Economic Education To create nanomanufacturing excellence, we must attend to all parts of the value chain.

  24. Nanomanufacturing Stakeholders Academic Centers Industry Government Labs & Agencies

  25. Four NSF Nanomanufacturing Research Centers • Center for Hierarchical Manufacturing (CHM) - UMass Amherst/UPR/MHC/Binghamton • Center for High-Rate Nanomanufacturing (CHN) - Northeastern/UMass Lowell/UNH • Center for Scalable and Integrated Nanomanufacturing (SINAM) - UC Berkeley/UCLA/UCSD/Stanford/UNC Charlotte • Center for Nanoscale Chemical-Electrical-Mechanical Manufacturing Systems (Nano-CEMMS) - UIUC/CalTech/NC A&T

  26. An open access network for the advancement of nanomanufacturing R&D and education • Cooperative activities (real-space) • Informatics (cyber-space) Mission: A catalyst -- to support and develop communities of practice in nanomanufacturing. www.nanomanufacturing.org

  27. nanomanufacturing.org

  28. Nanoinformatics • Nanotechnology meets Information Technology • The development of effective mechanisms for collecting, sharing, visualizing, modeling and analyzing data and information relevant to the nanoscale science and engineering community. • The utilization of information and communication technologies that help to launch and support efficient communities of practice.

  29. The Medici Effect at Work:Interdisciplinary Teamworkin Nanotechnology • Physics • Chemistry • Biology • Materials Science • Polymer Science • Electrical Engineering • Chemical Engineering • Mechanical Engineering • Medicine • And others • Electronics • Materials • Health/Biotech • Chemical • Environmental • Energy • Food • Aerospace • Automotive • Security • Forest products

  30. Nano-informatics: Some Major Nanotech Research Communities Fundamental Research Modeling & Simulation Nanomanufacturing Health & Life Sciences Education National Infrastructure Environmental, Health & Safety Materials Commercialization Societal Impact Energy Metrology

  31. "The Cathedral and the Bazaar" (Eric S. Raymond) • The open source movement: • The power of peer production by a large group with diverse agendas, expertise and perspectives • Yet an appropriate degree of editorial control (a filter) by an expert body of authority ensures quality control

  32. "Connect and Develop" (P&G) • Open Innovation via a distributed network • Printed Pringles and other examples

More Related