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International Conference on Sustainable Built Environment NANCO AND UNIVERSITY OF MELBOURNE JOINT RESEARCH SESSION ON N - PowerPoint PPT Presentation


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International Conference on Sustainable Built Environment NANCO AND UNIVERSITY OF MELBOURNE JOINT RESEARCH SESSION ON NANOTECHNOLOGY AND SUSTAINABLE BUILT ENVIRONMENT 13-14 December, 2010 at Earls Regency, Kandy, Sri Lanka.

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slide1

International Conference on Sustainable Built Environment

NANCO AND UNIVERSITY OF MELBOURNE JOINT RESEARCH SESSION ON NANOTECHNOLOGY AND SUSTAINABLE BUILT ENVIRONMENT

13-14 December, 2010 at Earls Regency, Kandy, Sri Lanka

slide2

CLAY NANO PARTICLE EMBEDED NANO FIBERS FOR UV PROTECED CURTAINS TO BE USED IN SMART HOUSES WITH NANO TECHNOLOGY

slide3

Research overview

MMT clay nano particles

UV blocking property

+

Polymer solution

Polymer composite (PAN/nano clay)

Electro spinning

Nano fiber composite

UPF (ultra violet protection factor)

Fiber strength

slide4

Montmorillonite clay nano particles

  • Montmorillonite clay nano particle – layered structure.

Structure of Na- MMT

MMT clay particle layered structure

Paul D.R, Robeson L.M, Polymer nano technology:nano composite, Polymer 49 (2008) 3187–3204

slide5

Montmorillonite clay nano particles and its properties

  • Modified nano clay in to polypropylene create active dye sites.
  • can impart flame retardant property to the composite
  • Have the UV blocking capability
    • Light scattering of a material due to change in refractive index.
    • layered structure of a material change the material’s refractive index.
    • Incident light is only attenuated through light scattering. therefore no absorption will take place.
slide6

UV radiation of sunlight

UV - C

UV - B

UV - A

315 – 400 nm

280– 315 nm

100 – 280 nm

Least dangerous

Human skin should be protected against

Most dangerous but absorbed by atmosphere

3.10 – 3.94 ev

3.94 – 4.43 ev

4.43- 12.4 ev

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Absorbency measurement of Na-MMT & SL nano clay

Commercial UV absorber : absorbency 2.25 at 290 nm- 350 nm

Na- MMT : 1 <absorbency <1.65 at 290 - 370 nm

SL nano clay : 1 <absorbency <1.48 at 290 - 400 nm

Absorbance behavior of MMT, SL Clay and commercial UV blocker

slide8

UV light source

B

A

0.0025M BTB/ 0.2g ZnO

Analysis of UV blocking property of Na-MMT & SL nano clay

slide9

Annalysis of UV blocking property of Na-MMT & SL nano clay cont..

UV blocking behavior of Na-MMT and SL Clay in powder and liquid form

slide10

Embedding clay nano particles to nano fibers

Preparation of polymer solution

Electro spinning (solvent spinning)

Nano fiber composite

PAN: clay – 10:1 +DMF

PAN +DMF

0kV power supply

Nano fiber web collected using the electro spinning

-15kV power supply

slide11

SEM images of PAN/Clay nano fiber composite

PAN/ SL clay nano fiber

PAN/ Na-MMT nano fiber

PAN nano fiber

slide12

UPF (Ultraviolet protection factor)

  • Measures the Ultra Violet protection of the substrate
  • Can be performed by measuring the material’s diffuse transmittance in the ultraviolet (UV) spectrum.
  • For textile materials UPF depends on
    • Thickness and density of the fabric
    • Fabric construction
    • Dye and pigments presence in the textile, fiber, yarn
    • Chemical structure of the fiber
slide13

Comparison of mechanical properties of nano fiber composite

Nano fiber tensile strength measure mechanism

  • Single fiber can be mounted on one end to an AFM cantilever tip using electron beam-induced deposition (that served as a force-sensing element)
  • Other end glued to the etched tip of a tungsten wire (using glue and optical microscope).
  • Tensile tests of the fiber can be conducted inside the SEM vacuum chamber
  • Applied force can be calculated from the observed deflection of the AFM cantilever

E. Zussman, X. Chen et at, Carbon 43 (2005) 2175–2185

slide14

Conclusion

  • MMT layered nano materials has the UV blocking capability.
  • SL nano clay compared to Na-MMT has a good UV blocking capability.
  • Nano clay particles embedded nano fibers can be produced using electro spinning technology.
  • Electro spinning technology has low out put and should be further developed to make fiber composite at bulk level.
  • SL nano clay with layered structure can be successfully use to produce curtains with UV blocking property.
  • Future work should focus on following
      • Measure the absorbency of the nano fiber composite in the UV spectrum
      • Measure the UPF of the fiber composite
      • Measure the individual nano composite fiber strength
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