Modular Adhesives And Energy-Dissipating Materials
Tech ID: 10126 / UC Case 1999-103-0
Brief DescriptionA modular, energy-dissipating material that prevents failure of adhesives, fibers and composite and other structures.
Natural materials are renowned for their strength and toughness. Spider dragline silk has a breakage energy per unit weight two orders of magnitude greater than high tensile steel, and is representative of many other strong natural fibers. The abalone shell, a composite of calcium carbonate plates sandwiched between organic material, is 3,000 times more fracture resistant than a single crystal of the pure mineral. The organic component, comprising just a few percent of the composite by weight, is thought to hold the key to nacre's (or mother-of-pearl's) fracture toughness.
Scientists at the University of California have developed a modular, energy-dissipating material that prevents failure of adhesives, fibers and composite and other structures. The modules include folded subunits or domains that unfold in a stepped fashion at forces below that necessary to break the backbone of the material and, with adhesive material, below that necessary to break the bonds that fasten the material to surfaces being glued..
This newly discovered mechanism enables the development of materials with unique characteristics, including:
- Adhesives or fibers that are not subject to catastrophic failure (i.e. breaking the molecular backbone of the adhesive or its attachments to the surface being glued);
- Adhesives or fibers that can "heal" or refold once the force is reduced;
- Adhesives or fibers designed to suit a specific need. For instance, modules that unravel at different forces could be used to produce adhesives that yield easily at first and then become more and more rigid;
- Adhesives used to pull surfaces together. Surfaces could be glued under conditions where the modules are unfolded and then the modules could be caused to enter the folded state;
- Smoothed force-verse-extension curves achieved using modules that unfold in multiple steps.
This modular elongation mechanism may prove to be quite general for conveying toughness to natural fibers and adhesives, including dragline silk. Although this behavior was discovered in a protein, it can be extended to human-made fibers and adhesives, such as those composed of block copolymers. It has applications ranging from armor to artificial tendons.
|United States Of America||Issued Patent||6,376,636||04/23/2002||1999-103|
- Deming, Timothy J.
- Hansma, Paul K.
- Kindt, Johannes H.
- Morse, Daniel E.
- Stucky, Galen D.
ADDITIONAL TECHNOLOGIES BY THESE INVENTORS
- A Novel Scanned-Stylus Atomic Force Microscope
- Combined Atomic Force And Scanning Confocal Microscope
- Moisture-Resistant Adhesive Polypeptides
- High Sensitivity Atomic Force Microscope
- Initiators For Block-Copolypeptide Synthesis
- Synthesis Of Silica And Silicone Polymer Networks Under Benign Conditions
- Inorganic/Block Coploymer-Dye Composites And Dye-Doped Mesoporous Materials For Optical And Sensing Applications
- Tough, Self-Healing Silicone Materials
- Nanoparticle Assembled Hollow Spheres
- Novel, Low-Cost Method For Fabrication Of Nanostructured Materials
- Use Of Magnetic Nanoparticles To Remove Dispersed Nanoparticles From Aqueous Solutions
- Thermally Stable Proton-Conductive Membranes for Fuel Cell Applications
- Polymer Shutter For Infrared Detection Systems
- Membranes for Electrochemical Devices and Materials (Fuel cells, Photovoltaic, Batteries)
- Polypeptide Vesicles for Intracellular Drug Delivery
- Hemostatic and Wound Healing Compositions
- High Performance Polymeric Material for Holographic Data Storage
- Novel Current Collector Design for Use in Rechargeable Lithium Metal Batteries
- Low Cost Nanoparticles for Fossil Fuel Exhaust Treatment
- Hydrogen Cyano Fullerene Containing Proton Conducting Membranes
- Hydrophilic Phosphoric Acid Compositions for Proton Conducting Membranes
- Method for Synthesis of Nanoparticles in Carbon Nanotube Arrays for the Study of Array Mechanical Properties
- Novel Capacitor for Rechargeable Batteries with Longer Lifetimes
- Method of Preparing Silicon and Silicon-Germanium Nanocomposites as Thermoelectric Materials
- Method and Apparatus for Magnetic Force Control of a Scanning Probe