MIT Department: Mechanical Engineering
Undergraduate Institution: University of Illinois, Chicago
Faculty Mentor: Evelyn Wang
Research Supervisor: Lin Zhao
My name is Malik Blackman and I am a third year junior majoring in Mechanical Engineering at the University of Illinois at Chicago. I am currently interested in carbon transmissions, energy systems, and micro-fluidics. My goal is to obtain my PhD in Mechanical Engineering and create a legacy that last longer than my lifetime, in some fashion. My hobbies are skateboarding, playing the alto saxophone, and beat-boxing.
2018 Research Abstract
Reducing Haze in a Scattering Media by Introducing Plasmonic Absorbing Nanoparticles
Malik Blackman1, Lin Zhao2 , and Evelyn Wang2
1Department of Mechanical Engineering, University of Illinois at Chicago
2Department of Mechanical Engineering, Massachusetts Institute of Technology
Windows are still the main reason for heat loss in buildings, and this can be attributed to a tradeoff between transparency and its thermal property. The path dependency of heat transfer and visible light is affected by haze – the percentage of transmitted light that is scattered so that is direction deviates from the direction of the incident beam. Haze creates a dispersion of light that in most cases, would be removed in order to make the scattering media transparent again. However, the interface created by the scattering has an optimal thermal property. Therefore, reducing the haze will increase the visibility, but also reduce the thermal property. Posed with the challenge of maintaining the medium’s thermal properties while reducing haze, our team proposes the introduction of plasmonic absorbing nanoparticles to achieve this. The haze is represented by Tdiffuse and Tdirect, which refers to both the scattered light and light coming directly from the light source, respectively. By adding plasmonic absorbing nanoparticles to the scattering media, Tdiffuse is reduced more than the reduction of the Tdirect, which translates to greater light visibility. The uniform mix of scattering and absorbing nanoparticles was analyzed using a UNI-vis-NIR. With varying wavelengths, the total transmittance, diffuse transmittance, and percent haze were collected. Our data shows a faster rate of reduction in haze at lower visible wavelengths versus higher visible wavelengths (~250-800nm). This innovation would be applicable to window treatments, that would allow a window to display optimal thermal properties while also maintaining its transparency.