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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)
