http://www.flickr.com/photos/soldiersmediacenter/2530663861/ Military nanotechnology research may lead to civilian use Nanotechnology is not only getting big in industry, but the military is investing time and money into the field. That is why the U.S. Army just initiated the Institute for Soldier Nanotechnologies (ISN)?a $50 million and 150-person initiative that will serve as the Army's center of expertise in the application of nanotechnology. The ISN's goal will be to increase the &quot;protection and survivability&quot; of U.S. soldiers with new technologies that target six priorities: threat detection, threat neutralization, automated medical treatment, concealment, enhanced human performance, and reduced logistical footprints. Reducing logistical footprints are especially important to an in-field soldier whose standard-issue gear now weighs upwards of 100 pounds. The goal is reducing the load to about 45 pounds. The high-tech uniforms and gear are the key components of the U.S. Department of Defense's vision for flexible, self-sufficient soldiers who could quickly get into rugged and unpredictable terrain. Although the final version of the U.S. soldier's uniform of the future is still several years away, researchers expect their work at the ISN will pay off sooner for the civilian world. Ferromagnetic materials already reduce vibration in engines; other commercial use will come in stronger materials and novel microphotonic devices. The nanotechnology-based uniforms in development for soldiers may also protect law enforcement officers, firefighters, and other emergency responders in the future, too. One of the partner companies, DuPont, is exploring nanotechnology and developing protective lightweight molecular materials to equip U.S. soldiers with uniforms and gear that help protect them, shield them, and heal them in the field. Researchers are developing nanotechnology-based materials, including protective lightweight uniforms and &quot;smart&quot; gear. A few examples of &quot;smart&quot; functionality are items that can: - Change colors on command to camouflage in changing environments?even manipulate light to make soldiers invisible in the field. - Change a shirtsleeve into a splint or a pant leg into a rigid cast in the field if a soldier is injured. - Possess built-in sensors of each soldier's physical condition and location in the battlefield so command posts can monitor soldiers from a distance. - Weave radio communications materials directly into the uniform's fabric?providing soldiers flexibility and lighter loads. - Automatically administer medicines and transmit vital signs to distant medics?who could then potentially perform medical triage on soldiers in the field. - Provide impact protection materials and systems including ballistic and shrapnel. - Provide chemical and biological protection materials and systems. Other ISN industrial partners are Raytheon, Partners Healthcare, Dow Corning, Triton Systems, Dendritic Nanotechnologies, Nomadics, Carbon Nanotechnologies, and W.L. Gore and Associates.
Image thanks to http://www.flickr.com/photos/loresjoberg/2289811055/ (creative commons license)
Image thanks to http://www.flickr.com/photos/loresjoberg/2289811055/ (creative commons license)
Performance Materials Module - Textiles
Performance Materials Textiles
Module Outcomes <ul><li>Understand the polymer structure of synthetic and natural fibres and textiles </li></ul><ul><li>Understand how properties of polymers influence textile applications </li></ul><ul><li>Have an awareness that unique textiles and other polymer-based materials with novel properties can be developed with nanotechnology. </li></ul>
What If? What if you could knit a car? <ul><li>Lauren Porter knitted this car for her art degree at Bath Spa University </li></ul><ul><li>Could be possible using carbon nanotube-enhanced textile and then setting in resin. </li></ul>Image: Courtesy Bath Spa University
What If? What if your t-shirt could stop a bullet? Image: 9229859@N02@flickr <ul><li>Professor Liangchi Zhang at the University of Sydney is investigating ballistic-resistant textiles using carbon nanotubes. </li></ul>
What Is A Textile? Image: decor8@flickr <ul><li>Textiles are materials that are made of fibres </li></ul><ul><li>Fibres in turn are made up of giant molecules called polymers. </li></ul>
Spot The Polymer Image: ierrroen@flickr, slipstitch@flickr, ericcastro@flickr <ul><li>We rely on polymers daily! </li></ul><ul><li>Polymers are made up of many molecules strung together to form really long chains. </li></ul>
Monomers Are The Subunits Of Polymer <ul><li>The repeating unit in a long polymer chain is called a monomer </li></ul><ul><li>Monomers join by addition reactions or </li></ul><ul><li>condensation reactions to form polymers. </li></ul>
Addition Polymerisation Image: coyotejack@ flickr <ul><li>Two monomers are joined by addition polymerisation when they are simply added on to the end of each other, and the process is repeated many times over </li></ul><ul><li>Polypropylene money is an example. </li></ul>
Condensation Polymerisation Image: [email_address] <ul><li>Two monomers are joined by condensation polymerisation in a reaction involving the loss of a molecule, usually water eg glucose + glucose maltose + water </li></ul><ul><li>Naturally-occurring condensation polymers include cellulose, chitin, hair, fur, leather and feathers </li></ul><ul><li>Nylon is a synthetic condensation polymer. </li></ul>
Synthetic Polymers Image: aliciayeah @flickr, quinet@flickr, recyclethis@flickr <ul><li>Synthetic polymers like nylon were invented during World War II (America and its allies were at war with the countries that produced silk and rubber) </li></ul><ul><li>Plastics are synthetic polymers, such as - polyethylene (used in cling film), - polystyrene (hot drink take-away cups) - Teflon (used for non-stick cookware) </li></ul><ul><li>Synthetic fibres and plastics are composed of monomers which are extracted from crude oil and modified by chemists. </li></ul>
Types Of Fibres Adapted from Elvins et al. (1995) ‘Materials Chemistry in Everyday Life’, Heinemann Chemistry in Context, Chemistry One Second Ed. Southbank Books, Port Melbourne. FIBRES Natural Synthetic Plant based (cellulose): Cotton Linen Hemp Jute Mineral Asbestos (rarely used) Animal Based (protein) Wool Silk Cashmere Angora Metal Wires Filaments Lurex Synthetic Nylon Polyester Acrylics Elastomers Polypropylene Regenerated Viscose Rayon Casein Seaweed based Inorganic Glass Carbon Quartz Ceramics
Polymer Example: Polyethylene Image: chitrasudar, lylamerle, foxtongue@flickr <ul><li>Apples release ethene gas when they ripen </li></ul><ul><li>Ethene gas molecules can be joined together to make a polymer called polyethylene - if no links are formed between the chains then the polymer can be used to make cling wrap - if chains of polyethylene are linked together with extra ethene molecules via intermolecular bonds then hard plastic road barriers can be made. </li></ul>
Experiment 1 and 2 <ul><li>Perform one or both of the Making and Investigating Plastics experiments </li></ul><ul><li>Experiment 1 - Making Casein </li></ul><ul><li>Experiment 2 - Making Nylon </li></ul><ul><li>to further explore the characteristics of polymers. </li></ul>
Chemical Control Of Synthetic Textile Properties <ul><li>The properties of a synthetic textile can be controlled chemically by modifying the polymers involved in their synthesis </li></ul><ul><li>Altering reaction conditions can affect how strongly the polymer molecules are attracted to one another, and in turn, how strong or flexible the fibre and textile will be </li></ul><ul><li>Atoms or small molecules can be added to the monomers or the polymers to give them unique properties. </li></ul>
Nanotubes In Unique Textiles Image: Courtesy Ray Baughman <ul><li>Carbon nanotubes can be spun into fabric to form nanocomposite fibres - this is currently an area of research at CSIRO, Australia - very strong and yet lightweight fabrics are possible </li></ul><ul><li>Spun carbon nanotubes can be 3x stronger than spider silk - made by bonding carbon nanotubes with the polymer PVA. </li></ul>Half the threads in this textile are black carbon nanotube threads
Experiment 3 <ul><li>Perform the Observing Fabric Properties Experiment to see the unique characteristics of nano fabrics. </li></ul>
Nano-Textiles: Military Applications Nano-fabrics offer the following possibilities to the military: Image: soldiersmediacenter@flickr - Instant camouflage to environment; - manipulate light to make soldiers invisible; - Change a shirt-sleeve into a splint or cast; - Possess built-in sensors of soldiers’ physical condition and location; - Weave radio communications directly into the uniform's fabric; - Automatically administer medicines & transmit vital signs to distant medics; - Provide impact protection materials and systems; - Provide chemical and biological protection.
Nano-textiles: Liquid Armour Image: paulk@flickr <ul><li>Impact resistant: bullet proof, will also resist pointed objects such as needles, icepicks, swords </li></ul><ul><li>Made from a ballistic fabric (eg Kevlar) filled with a shear thickening fluid - this is a water like liquid (polyethylene glycol) that contains silica nanoparticles </li></ul><ul><li>Under normal conditions, the armour is like water but it stiffens on impact </li></ul><ul><li>Materials such as this are perfect for combat - imagine Superman with a suit which allows flexibility for crime fighting while at the same time enabling him to protect vulnerable areas (so that’s why he wears his undies on the outside!) </li></ul><ul><li>Since the material is also very lightweight it will not result in extra energy expenditure during movement (eg Superman flying). </li></ul>
Unique Textiles Many companies are currently using nanotechnology to create unique textiles.
What If? What if your clothes could always smell like your favourite fragrance? Image: derek7272@flickr “ Research scientists at Bayer Chemicals have developed a new technology for ‘packaging’ fragrances in an ultra-thin nanofilm to form microcapsules. Leather and textiles sprayed with these microcapsules then release a soothing or exotic fragrance…..when subjected to pressure”.
What if polymers could sense and respond to your environment? Image: Courtesy Gordon Wallace, Uni of Wollongong. <ul><li>Nanotechnology has been used to create conductive polymers - these polymers contain carbon nanotubes or other components which respond to the environment - examples include : ink jet-printed functional polymers which can detect volatile compounds; polypyrole polymer which expands and contracts (could be used for artificial muscles). </li></ul>
Intelligent Design In Polymers <ul><li>It is possible to create new types of polymers. They can be incorporated into clothes so that they light up or carry electric signals </li></ul><ul><li>Phillips have designed a range of sensors that can be fitted to underwear. In the event of a health crisis, these can alert medical authorities - so that’s another reason for Superman to wear his undies on the outside! He can signal to approaching aircraft and call for help if necessary. </li></ul>
Superman Image: loresjoberg@flickr So we have a few ideas about why Superman wears his undies on the outside…
Superman Image: loresjoberg@flickr What other special properties must Superman’s suit have?
Superman’s Nanosuit Activity <ul><li>Divide into groups and consider: - why does Superman need such a resplendent item of clothing? - how does Superman use his suit to perform his duties as a superhero? - what special properties of Superman’s suit allow him to perform his duties? </li></ul>
Superman’s Nanosuit Activity <ul><li>Superman has lost his suit. Apparently he left it in the very last telephone box in Metropolis and while he was off saving the world, the phone company removed the box and destroyed it </li></ul><ul><li>Being a nanotechnologist working for a textile factory, you have been offered the top secret contract to make Superman a gorgeous new version of his iconic outfit </li></ul><ul><li>Using your knowledge of nano-scaled materials, explain what materials the suit will be made from, why you have chosen a particular material and how it exhibits the properties described. </li></ul>
Superman’s Nanosuit Activity <ul><li>SUPER PROPERTIES :- what special properties will the suit need to have? For example: when Superman stops bullets his suit is not damaged; what properties of the suit will allow him to absorb energy from the sun? </li></ul><ul><li>FABRIC PROPERTIES :- Consider stretch, durability, colours. Superman needs to be able to move easily when he is chasing villains. Also it is very cold up in the stratosphere and he must resist heat on re-entry to the atmosphere </li></ul><ul><li>CLEANING AND STORAGE : - How will the suit maintain its shiny lustre? Will Superman need to do the ironing before a rescue? </li></ul><ul><li>SAFETY :- Materials must be non-hazardous to Superman, and it is important that aircraft and spacecraft can see him clearly </li></ul><ul><li>AERODYNAMICS :- Superman needs to maintain a streamlined shape. His cape must provide him with adequate lift. He needs to alter the directions of the forces acting on him if he wants to change direction quickly. The cape must work efficiently on earth and in the stratosphere. </li></ul>Consider the following points:
Summary <ul><li>Polymers are evident all around us </li></ul><ul><li>Polymer characteristics depend on the type of monomer and the intermolecular bonds operating </li></ul><ul><li>Textiles with unique characteristics can be generated by incorporating nanotechnology into existing polymers. </li></ul>
Revision <ul><li>Explain what is meant by the term “textile” </li></ul><ul><li>How has nanotechnology improved textiles? </li></ul><ul><li>What are polymers? </li></ul><ul><li>List 5 things that are made from polymers. </li></ul><ul><li>What potential applications are there when polymer chemistry is combined with carbon nanotubes? </li></ul><ul><li>Describe in detail one application of nanotechnology in textiles </li></ul><ul><li>List three fabrics/brand names that make clothes using nanotechnology. </li></ul>