Transcript
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    by

    T.Srinath

    Research Assistant

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    WHAT IS MEANT

    HYDROPHOBICITY??• Hydrophobic = Water Hating• When water hits a hydrophobic surface, it beads.

    Hydrophobicsurface=beading

    Water beads

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    HYDROPHOBIC EFFECT

    • The hydrophobic effectrepresents the tendency ofwater to exclude non-polarmolecules. The effectoriginates from the

    disruption of highlydynamic hydrogen bonds between molecules ofliquid water.

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    The Lotus Leaf Effect

    The leaves of Lotus plants have theunique ability to avoid gettingdirty.

    They are coated with wax crystalsaround 1 nanometer in diameter.

    Droplets falling onto the leavesform beads and roll off taking dirtwith them, meaning the leaves areself-cleaning.Sometimes referred to as“The Lotus Leaf effect ”

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    HYDROPHOBIC SAND

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    NANO PARTICLE

    A nanoparticle (ornanopowder or nanocluster

    or nanocrystal) is amicroscopic particle with atleast one dimension lessthan 100 nm.

    Nanoparticle research iscurrently an area of intensescientific research, due to awide variety of potentialapplications in many fields.

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    NANO COATING COMPOSITION

    • Super hydrophobic coatings can be made frommany different materials:

    Manganese oxide polystyrene (MnO 2/PS) nanocompositeZinc oxide polystyrene (ZnO/PS) nano-compositePrecipitated calcium carbonateCarbon Nano tube structuresSilica nano-coating

    Nanocrystalline titanium dioxide (TiO 2).

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    APPLICATIONS

    Hydrophobic coatings are being used in

    many different areas:• Self cleaning glass• Aerospace• Wood construction• Monument protection• Automobile Cleaning

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    Bored of cleaning glass doors or glass

    objects regularly ???

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    SELF CLEANING GLASS

    • Scientists havemimicked natureat the nanoscaleto create glasssurfaces that are

    ‘self -cleaning’like the Lotusleaf.

    Self cleaning glass Normal glass

    No more scrubbing ofshower screens!

    No more Spidermanwindow cleaner!

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    SELF CLEANING GLASS

    How does it work?•

    Glass is coated with a layer of nanocrystallinetitanium dioxide (TiO 2). The titanium dioxidereacts to the ultraviolet (UV) component ofsunlight causing a gradual break down andloosening of dirt.

    • This is known as the ‘ Photocatalytic ’stage.

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    WHAT EXACTLY HAPPENS

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    Thinking how to

    protect a monumentfrom atmosphericchanges???

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    Monument Protection• Much of the damage to protected monuments aroundthe world is caused by weather.

    • Using nanotechnology, a protective coating can beapplied to the monuments to

    protect them from theelements.

    • Nanotechnology preventswater from seeping into thecrevices and freezing to causecracks and damage.

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    Living in a wooden house and

    scared of any fire accident??

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    WOOD PROTECTION

    • Wood, when sprayed

    with a protectivecoating, will not burn .In the pictures, the boardon the top is burning.

    • The board on thebottom looks to becharred, but the charringscrapes off with ease.

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    Scared of Boarding a Plane in Winter

    Don’t Worry….

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    AERO SPACE

    • Hydrophobic coatingsusing nanotechnology

    are helping in theaerospace industry bymaking airplane wingsresistant to water and ice

    coatings.• Many airplane crashes

    have been attributed toice on the wings beforeand during flight.

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    Fed up of continuousvehicle cleaning??

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    AUTOMOBILE CLEANING

    • hydrophobic nanocoatingcan coated on anautomobile body whichdoesn’t not allow any dirtto deposit on the outer

    body.• Hence cleaning it self

    without giving any burdenof continuous cleaning

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    NISSAN PROTOTYPE OF SC CAR

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    ADVANTAGES

    • Protects glass from corrosion (acid rain etc.)• Easy application through spraying, polishing,

    immersion, smearing etc.• Optically neutral ( colourless, transparent).• UV Protection

    • Stable at varying temperatures.• Low Cleaning and Maintenance requirements.• Retains the quality of surface.• Ecologically beneficial & biologically safe.

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    DISADVANTAGES

    • It is very expensive.•

    Continuous washing may reduce theconcentration of the coating• Not applicable to food and beverages

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    THE FUTURE

    • Nanotechnology provides new materials thatcould potentially have profound affects on

    building design.• For instance, glass can be used more liberally if it

    is optically tuned to block heat and UV.

    • It would be possible to construct a building withmany more, larger windows than is currentlyviable, since heat can be kept out and UV photo-damaged prevented.

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    FUTURISTIC BUILDINGS

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