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Progress and Paper report

This report details significant advancements in the research and development of heat-insulating coatings applied to windows to improve energy efficiency. Conducted by A.K. Ang, P.V. Ramos, M.L. Jamero, and I.B. Culaba, the study highlights the acceptance of the SPP Manuscript on evaporation techniques for multilayer coatings, focusing on materials such as Cr/Cu/Cr and their effectiveness in minimizing thermal transmission while maximizing visible light transmission. Methodologies include spectrophotometry and adhesion tests. The findings suggest that these coatings can significantly enhance heat insulation in architectural applications.

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Progress and Paper report

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  1. Progress and Paper report Sept 23, 2009

  2. Progress • SPP Manuscript was accepted Evaporation of a multilayer coating with low transmission in the Infrared region • A. K. Ang1, P.V. Ramos, M. L. Jamero and I. B. Culaba

  3. Introduction • 1970’s energy crisis led to research focused on conserving energy • German researchers found windows as one of the biggest “heat holes” • Heat insulating coatings on windows

  4. Introduction • BiOx/Au/BiOx, ZnS/Au/ZnS, glass/BiOx/PbOx/Ag/PbOx/BiOx, TiO2/Ag/ZnO and TiO2/Ag/TiO2 systems • Silver based systems • Lowest thermal transmission • Highest visible light transmission

  5. Introduction • Similar optical properties of Ag, Au, Al, Cu

  6. Design • Cr/Cu/Cr on glass substrates • Cr adhesion layer • Cu layer as the main mirror • Third Cr layer for suppression of surface oxidation, preserving its optical properties

  7. Methodology • 36.5mmx 25.5mmx 1.1mm glass slides • Cleaning procedure for glass • N2 gas • KOH solution • KOH + CaCO3 • HNO3 • Distilled water • 2-propanol • Breathe test

  8. Slides Thickness monitor Substrate holder Methodology

  9. Methodology • Base pressure of 10-5 torr • Chromium layers • Cr-coated tungsten rod at 90A • Copper layers • Mb dimpled boat at 180A

  10. Methodology • Ocean Optics USB-2000 Spectrophotometer • 400nm-800nm • Shimadzu IRAffinity 1 FT-IR Spectrophotometer • 2000nm-20000nm • 800nm-2000nm • No data

  11. Results and discussions

  12. 8μm 8μm 8μm 8μm A B D C Results and discussions

  13. Results and discussions

  14. Results and discussions

  15. Results and discussions • in a study conducted by Hass, the percent reflectance of copper films in the 800-2000nm region is constant at around 90% [9]. With such high reflectance in this region, the percent transmission is expected to be minimal, which agrees with the data in Fig. 2.

  16. Conclusion • “Thus Cr/Cu/Cr coatings, having minimal infrared transmission and transmission peaks in the visible region, can be used as a heat insulating system coated on windows”

  17. Sample 4 Progress • Collected new data in visible region Sample 3 Sample 2 Sample 1

  18. Progress • Also collected data in the visible region using Shimadzu UV PC Spectrophotometer • Double beam spectrophotometer • Data still not retrieved from Chem department PC

  19. Progress • Performed adhesion test for first 4 samples

  20. Progress

  21. Progress • Fabricated new samples • Deposition time as basis of film thickness • 20 sec of Cr deposition at 90 A 4 nm/sec x 20 sec = 8 nm • Cu deposition at 180 A • 20, 30, 60, 180 sec samples were already fabricated

  22. IR thermometer Heat shield Mask Heat absorbing plate Progress • Set up for heat insulating tests 150W lamp

  23. Things to do • Test heat shield properties • Purity test for Cu used in evaporation • Acquire coated window samples from UPPA • Compare heat shielding properties of these with Cr/Cu/Cr samples

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