MYTHILI TUMMALAPALLI
2010TTZ8217
SUBMITTED TO
DR. BHUVANESH GUPTA
 UVA (320 to 400 nm)
 UVB (290 to 320 nm)
 UVC (200 to 290 nm)
UV-B irradiance at the surface based on the abundance of
ozone, as measured by NASA’s Total Ozone Mapping
Spectrometer (TO...
Courtesy: http://www.cushnshade.com
Aerospace
Aviation
Petrochemical
Electronics
Machinery
Environment
Protection..
 Ultraviolet Protection Factor (UPF)
Eλ = erythemal spectral effectiveness
Sλ = solar spectral irradiance in W/m2/nm
Tλ =...
 Solar Protection Factor (SPF)
MED = Minimum Erythrymal Dose
Higher the UPF and SPF values, better the UV
protection by t...
Courtesy: http://www.cushnshade.com
 Fiber chemistry
 Fabric construction, porosity, thickness and
weight;
 Moisture content
 Dye concentration, whitening...
UV absorbers Colors
Finishes - - NANO
 Nanotechnology - structures sized between
1 to 100 nm in at least one dimension
 ZnO, TiO2 , ZrO - absorb the UV radiat...
 High surface-to-volume ratio - adhere well
to the fabric
 Transparent appearance
 High surface area and high surface e...
 Cotton/polyester
 Higher UPF
 Woven better UPF than knitted
 Polyester/cotton blend - better UPF than pure
cotton - U...
 Hexamethyelenetetramine and zincnitrate
 Cotton fabric - treated in hot water to obtain
1D needle-shaped nano ZnO cryst...
(a) before treatment, (b) after soaking in the SiO2 solution, (c) after
chemical deposition of ZnO, and (d) after hot wate...
(a) before treatment, (b) after
soaking in the SiO2 solution, (c)
after chemical deposition of ZnO,
and (d) after hotwater...
 CeO2 -excellent UV absorption - low
photocatalytic activity
 CeO2 + ZnO - reduce the catalytic and
photocatalytic activ...
 Layered fabric systems with electrospun ZnO
nanocomposite fiber webs - various conc of
ZnO in a range of web area densit...
SEM micrographs of (a)
electrospun polyurethane
nanofiber web, (b) electrospun
polyurethane/ZnO
nanocomposite fiber web an...
S. Lee, Fibers and Polymers, Vol.10, No.3, 2009, pg. 295-301
 Anti microbial + UV protective
Transmission spectra of PES fabrics loaded of with TiO2
nanoparticles
D. Mihailovic et al., Carbohydrate Polymers, Vol. 79...
 Particle-embedded acrylic coatings
transparent to visible light but absorb UVR
 UV absorption behavior of nano- and mic...
Absorption spectra from various size TiO2 particles
P. Katangur et al., Polymer Degradation and Stability, Vol. 91, 2006, ...
 Cotton, Polyester, Cotton/Polyester Blend –
Coated with ZnO – Gamma Irradiation for
curing
 UPF increased with an incre...
SEM micrographs of (a) uncoated polyester fabrics (b) ZnO coated
polyester
SEM micrographs of (a) untreated Cotton fabrics...
UPF &UV transmittance of coated
PET fabrics
UPF & UV transmittance
of coated cotton fabrics
 Large surface area – better UV absorption
 Transparent appearance on coatings
 Applied using different techniques
 Re...
 Richard A. Scott, “Textiles for Protection,” Woodhead Publishing Limited, 2005.
 D. Saravanan, AUTEX Research Journal, ...
Nanofinishes for UV protection in textiles
Nanofinishes for UV protection in textiles
Nanofinishes for UV protection in textiles
Nanofinishes for UV protection in textiles
Nanofinishes for UV protection in textiles
Nanofinishes for UV protection in textiles
Nanofinishes for UV protection in textiles
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Nanofinishes for UV protection in textiles

Published on: Mar 3, 2016
Published in: Technology      Business      Lifestyle      
Source: www.slideshare.net


Transcripts - Nanofinishes for UV protection in textiles

  • 1. MYTHILI TUMMALAPALLI 2010TTZ8217 SUBMITTED TO DR. BHUVANESH GUPTA
  • 2.  UVA (320 to 400 nm)  UVB (290 to 320 nm)  UVC (200 to 290 nm)
  • 3. UV-B irradiance at the surface based on the abundance of ozone, as measured by NASA’s Total Ozone Mapping Spectrometer (TOMS) instrument during the month of November, 2000.
  • 4. Courtesy: http://www.cushnshade.com
  • 5. Aerospace Aviation Petrochemical Electronics Machinery Environment Protection..
  • 6.  Ultraviolet Protection Factor (UPF) Eλ = erythemal spectral effectiveness Sλ = solar spectral irradiance in W/m2/nm Tλ = spectral transmittance of fabric Δ λ = the bandwidth in nm λ = the wavelength in nm
  • 7.  Solar Protection Factor (SPF) MED = Minimum Erythrymal Dose Higher the UPF and SPF values, better the UV protection by the fabric
  • 8. Courtesy: http://www.cushnshade.com
  • 9.  Fiber chemistry  Fabric construction, porosity, thickness and weight;  Moisture content  Dye concentration, whitening agents, UV absorbers  Finishing chemicals
  • 10. UV absorbers Colors Finishes - - NANO
  • 11.  Nanotechnology - structures sized between 1 to 100 nm in at least one dimension  ZnO, TiO2 , ZrO - absorb the UV radiation  ZnO, TiO2 - non-toxic, compatible with human skin, chemically stable under both high temp. and UVR, easily available
  • 12.  High surface-to-volume ratio - adhere well to the fabric  Transparent appearance  High surface area and high surface energy - bound to the surface of the fibres by van der Waals forces - wash fastness
  • 13.  Cotton/polyester  Higher UPF  Woven better UPF than knitted  Polyester/cotton blend - better UPF than pure cotton - UV absorption of polyester Karthivelu et al., Indian Journal of Fibre & Textile Research, Vol. 34, September 2009, pg. 267-273
  • 14.  Hexamethyelenetetramine and zincnitrate  Cotton fabric - treated in hot water to obtain 1D needle-shaped nano ZnO crystallites
  • 15. (a) before treatment, (b) after soaking in the SiO2 solution, (c) after chemical deposition of ZnO, and (d) after hot water treatment at 100 °C for 2.5 h
  • 16. (a) before treatment, (b) after soaking in the SiO2 solution, (c) after chemical deposition of ZnO, and (d) after hotwater treatment at 100 °C for 2.5 h. (a) before treatment, (b) after soaking in the SiO2 solution, chemical deposition of ZnO, and boiling water treatment for 3 h, and (c) after 20 washes Mao et al., Thin Solid Films, Vol. 517, 2009, pg. 2681–2686
  • 17.  CeO2 -excellent UV absorption - low photocatalytic activity  CeO2 + ZnO - reduce the catalytic and photocatalytic activities  Fine ZnO:CeO2 particles with very small size - unique UV absorbing ability, high stability at high temp., high hardness, and low activity as catalyst J. F. Lima et al., Applied Surface Science, Vol. 255, 2009, pg. 9006–9009
  • 18.  Layered fabric systems with electrospun ZnO nanocomposite fiber webs - various conc of ZnO in a range of web area densities  Extremely thin, Light-weight, Mechanically flexible  Desired functionalities imparted without significant increases in weight or thickness
  • 19. SEM micrographs of (a) electrospun polyurethane nanofiber web, (b) electrospun polyurethane/ZnO nanocomposite fiber web and the cross-sectional view of a nanocomposite fiber (inset), and (c) cross-sectional view of a layered fabric system
  • 20. S. Lee, Fibers and Polymers, Vol.10, No.3, 2009, pg. 295-301
  • 21.  Anti microbial + UV protective
  • 22. Transmission spectra of PES fabrics loaded of with TiO2 nanoparticles D. Mihailovic et al., Carbohydrate Polymers, Vol. 79, 2010, pg. 526– 532
  • 23.  Particle-embedded acrylic coatings transparent to visible light but absorb UVR  UV absorption behavior of nano- and micron size particles  Thick coatings of 10 μm and 20 μm applied to Kevlar fabrics
  • 24. Absorption spectra from various size TiO2 particles P. Katangur et al., Polymer Degradation and Stability, Vol. 91, 2006, pg. 2437 – 2442
  • 25.  Cotton, Polyester, Cotton/Polyester Blend – Coated with ZnO – Gamma Irradiation for curing  UPF increased with an increase in the concentration of the UV absorber M. H. Zohdy et al., European Polymer Journal, Vol. 45, 2009, pg. 2926–2934
  • 26. SEM micrographs of (a) uncoated polyester fabrics (b) ZnO coated polyester SEM micrographs of (a) untreated Cotton fabrics (b) Alum/ZnO coated fabric
  • 27. UPF &UV transmittance of coated PET fabrics UPF & UV transmittance of coated cotton fabrics
  • 28.  Large surface area – better UV absorption  Transparent appearance on coatings  Applied using different techniques  Reasonable wash fastness  Can be used to produce multifunctional components
  • 29.  Richard A. Scott, “Textiles for Protection,” Woodhead Publishing Limited, 2005.  D. Saravanan, AUTEX Research Journal, Vol. 7, No 1, March 2007.  Hoffmann et al., Arch Dermatol, Vol. 137, August 2001.  Karthivelu et al., Indian Journal of Fibre & Textile Research, Vol. 34, September 2009, pg. 267-273.  Mao et al., Thin Solid Films, Vol. 517, 2009, pg. 2681–2686.  J. F. Lima et al., Applied Surface Science, Vol. 255, 2009, pg. 9006–9009.  S. Lee, Fibers and Polymers, Vol.10, No.3, 2009, pg. 295-301.  D. Mihailovic et al., Carbohydrate Polymers, Vol. 79, 2010, pg. 526–532.  P. Katangur et al., Polymer Degradation and Stability, Vol. 91, 2006, pg. 2437 - 2442.  H. Zhang et al., Polymer Degradation and Stability, Vol. 94, 2009, pg. 278–283.  M. H. Zohdy et al., European Polymer Journal, Vol. 45, 2009, pg. 2926–2934.  www.wikipedia.org  Fernando et al., Nanotechnology Applications in Coatings, ACS Symposium Series, American Chemical Society, Washington D.C., 2009.  M. D. Newman et al., Journal of American Academy of Dermatology, October 2009.

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