Johns Hopkins
Engineering Design Day

Tuesday, May 4, 2021

The Johns Hopkins Engineering community is creating a better future, translating theoretical knowledge into real-world solutions.


Join us on Tuesday, May 4 for a virtual celebration showcasing student innovation and creativity at Hopkins Engineering annual Design Day!

design projects

engineering students

project directors

Design Day Projects

Recycling of Polystyrene Cups via D-Limonene for Use in Fabric

Team: The New Norm

Program: Materials Science and Engineering

Our team has demonstrated a non-degradative method for cleanly and repeatedly recycling polystyrene (PS) drinking cups by dissolving them in d-limonene (D-L), an organic solvent derived from citrus rinds. This solvent is highly selective and only strongly dissolves PS among the common recycling polymers. It also removes common contaminants, as drink residues are water-based and non-soluble. The cleaned and separated PS can then be recovered from the D-L either via steam distillation, resulting in bulk PS, or via wet-spinning into a linear alkane, resulting in PS filament. This PS can then be reused, either for general PS uses such as drinking cups or styrofoam, or blended with other common polymers to produce a clothing-ready fabric.


  • Dr. Orla Wilson
  • Lauren Choi

Team Members

Project Links

A brief voiceover of our project poster.

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