Transcript

INTERNATIONAL ADVANCED RESEARCH CENTRE FOR POWDER METALLURGY AND NEW MATERIALS (ARCI),

HYDERABAD, INDIA

Demonstration of self-cleaning effect on flow and spray coated glazed ceramic wall tiles –

Methylene blue stain

CENTRE FOR SOL-GEL COATINGS

Anti-microbial, Easy-to-clean Coatingson Metals, SS, Glass and Plastic

Key Features:•Incorporationofanti-microbialnanoparticles,controlledreleasemechanism

•Easy-to-cleancoatingshavesurfacepropertiescomparabletoperfluorinatedpolymers(hydrophobicsurface)

Potential Applications:- SSsheetsinhospitalwallpanels- Medicine/Pharamaceutical:Medicinebottles/containers

- Healthcare:Hearingaids,hospitalfurniture- Foodpackaging- Textileandfabric:textilewallsandtextileroofs,sunshades,blinds

Self-cleaning, Photocatalytic Coatingson Metals, Glass and Ceramics

Key Features:

•Self-cleaningandselfsterilizingsurfaces•Hydrophilicsurfaceformationfacilitatingeasycleaningbyrainorrinsingwithwater(self-cleaningeffect)

•Self-cleaningcoatingsactivatedbysunlight/artificialUVlight

•Longlife,stronglyenhancedUVprotectionbyTiO2

Potential Applications:

- Architecturalglassandtiles- Medical/Pharmaceutical:Medicinebottles/containers

- Textilesandfabric:textilewalls,textileroofs,sunshadesandblinds

0 hr

TiO2 coated

Un-coated

78 hr

TiO2 coated

Un-coated

TiO2 coated

Un-coated

TheCentrecantakeupdevelopmentoftargetedapplicationsofspecificinteresttoindustriesandeventuallytransferthepertinentknow-howtotheconcernedentrepreneurs/industries.

Anti-microbial coatings for door mats

Physical appearance of TiO2 thin film

Forfurtherinformation,pleasecontact:Dr. R. Subasri (Centre for Sol-gel Coatings)/

Mr. Sanjay Bhardwaj (Centre for Technology Acquisition and Transfer)INTERNATIONAL ADVANCED RESEARCH CENTRE

FOR POWDER METALLURGY AND NEW MATERIALS (ARCI)Balapur P.O., Hyderabad- 500 005, INDIA

Tel: 040-24443567/24444411; Fax: 040-24442699E-mail: [email protected] / [email protected]; http://www/arci.res.in/csgc/index.html

Nanotechnology is one of the keytechnologies of the 21st century and

sol-gel processing is one of the differentwet chemical methods that can createnanocrystalline or nanoscaled amorphousmaterials.Sol–gelmethodhasaboutthreedecadelonghistory,startingwithprocessingof oxide materials including glass andceramicsinearlydaystopreparationofnon-oxidesaswellintherecenttimes.Processingof organic-inorganic hybrid nanocompositematerials using this technique is now anactive field of research. The advantageof an organic-inorganic hybrid is that itcan favorably bring synergy between thedissimilarpropertiesoforganicandinorganiccomponents in a single material. Sol-gelderived hybrid nanocomposite materialsynthesis involves the poly-condensationof organically modified silanes along withsiliconormetalalkoxides.Outofthevariousmaterial forms that sol-gel processing canleadtosuchas,generationof:

a)denseceramicbodies;b)coatings/thinfilms;c)aerogels;d)monoliths;ande)ceramicfibres,hybridnanocompositecoatingsgeneratedbysol-gel processareextremelypromising forcommercialexploitationduetothefollowingadvantages:

• Eco-friendliness•Possibilitytotailorpropertiesatnanoscale• Multi-functionality •Good mechanical properties due to inorganic

network• Flexibilityofcoatingandcompatibilitywith organicpaintsduetoorganicmoiety•Possibilityofthickcoatingsduetoindependently

polymerizableorganicgroups• Suitabilityfordepositionondifferentsubstrate

materials such as metals/SS, ceramic tiles,glass,plastics

• Lowtemperatureultraviolet (UV)/near-infrared(NIR)curability

• Amenability fordepositionon largeareaswithroboticautomation

•Scalabilityofsolsynthesisandcoating deposition

TheCentreforSol-gelCoatingsatARCI,Hyderabadestablishedrecentlyisequippedwithstate-of-the-art facilities for pilot scale demonstration of allassociated operations of the coating technology.TheCentre isnowworkingwithseveral industrialpartners for development and demonstrationof sol-based nanocomposite coatings for awide variety of applications. The Centre is alsopursuingbasicresearchforfurther improvingthetechnology. By virtue of the above mentionedadvantagesandthevariedfunctionalitiesthatthecoatingscanyield,theycanbeadoptedtoabroadspectrumofapplications. Someapplicationsarepresentedinside.

Key Features:

•Transparentorcoloured•Hydrophobicsurfaceformationfacilitatingeasycleaningbyrainorrinsingwithwater

•Avoidsformationofstreakingcausedbytheflowingwater

•Easy-to-cleansurfacesagainstgraffitiandstainscausedbycoffee,tea,colasandhouseholdoils

•Lesssusceptibletothegrowthofmicro-organisms

•Remainscleanforlongerperiods

Potential Applications:

- Architecturalglasssheets- AluminummirrorsinSolarcollectors- Medicalandhealthcare- Railwaycarriagesandpublicutilityareas-Aircrafts

Easy-to-Clean Coatings on Metals, SS, Glass, Plastic, Ceramics

Key Features:

•Highscratchhardnessandabrasionresistance

•Longlife•Goodadhesion•Colouredcoatingspossible•CanbecoatedonPolycarbonate,PMMAetc.•Canbemadeeasy-to-cleanwithlowsurfacefreeenergy

Potential Applications:

- Roadtransport:Roadandpavementmarkers- Helmetvisors- Automotiveheadlamps- Colouredheadlampsforimprovedaestheticappealandstyle

- Ophthalmiclenses- Ophthalmoscopiclenses

Key Features:

•Anti-fingerprint,easy-to-clean•Highscratchhardnessandabrasionresistance•Hightemperaturetarnishprotection•Lowtemperaturecurablecompositionsusedasreplacementforchromate-freeprimers

•Protectionagainstacidattackandionleaching•Colouredcoatingspossible

Potential Applications:

- Householdappliances- Medicineandhealthcare:medical/surgicalinstruments

- Automotive:exhaustpartsformotorcycles,cars

- Architectural

Key Features:

•Adjustabletransmissionandrefractiveindexofthecoatings

•Colourofthecoatingcanbecontrolledbysuitablechoiceofdopants

•UV,temperaturestableandweatherproof•Recyclabilityofglassduetocompletedegradationoforganicconstituentsathightemperatures

•Opaquecoatingspossiblewithhightemperaturedurability

Potential Applications:

- GlassandCeramicindustry:colouredglassesforaestheticsordecoration

- Scratchresistantcolouredcoatingsforglassbottlesusedinvariousindustriessuchasperfume,liquorandfashionfields

- Architecturalapplications

Hard Coatings on Plastics Glass-like Corrosion Protection Coatings for Metals, SS

Decorative Coatings on Glass and Ceramics

Hard coating on retroreflective

pavement marker

Hard coating on PMMA bi-aspheric lens

Hard coating on retroreflective lens

Abrasion wear tested polycarbonate sample with hard coating (bottom half)

Coated (bottom) and uncoated (top) glass showing difference in

hydrophobic behavior

Coated (Right) and uncoated (Left) SS showing difference in

hydrophobic behavior

Abrasion resistant hydrophobic coating on PU-painted carbon-

epoxy composite

Coloured, tarnish-resistant,glass-like coatings on stainless steel

Transparent, corrosion and scratch resistant coatings

on carbon steel

Coloured, corrosion resistant coating on Al after 720 h

salt spray test

Transparent coloured coatings (a) for interior applications (b) on glass panes(c) for glassware

(b) (c) Opaque and scratch resistant coloured coatings on glass

(a)


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