Sunday, August 16, 2015

Results: Osuji Lab

We tested the following variables for array optimization: Acetone Concentration in Growth Solution (%), Spin-Coat RPM (1750-2500), Growth Temperature (60-80), & Molecular Weight of Ps-b-P4VP block copolymer. My mentor and I had initial expectations before conducting each variable. We expected that an increase in acetone concentration would give us a larger areal density of rods. This is because the acetone swells the PS coronas, which allows more reactants to come into contact with the cores. We also understood that the micelle cores were made of P4VP polymer chains. The size of the P4VP cores is directly related to the nanorod diameter, meaning that as the molecular weight of the P4VP increases, the diameter will as well.

We attained the following results.

From our investigation, we were able to determine that 15% acetone concentration provided the best uniform growth of the four shown.

We also determined that 2000 RPM was a soundly speed at which the nanorods could be most uniform.

As you can see, there is no adequate growth pattern that is dependent on the molecular weight of the polymer.

As you increase the temperature, the aerial density increases and the rod diameter decreases.

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