The University of Sydney has offered an undergraduate course in particle technology using a contemporary problem based learning (PBL) methodology since 2005. Student learning is developed through the solution of complex, open-ended problems drawn from modern chemical engineering practice. Two examples are presented; i) zero emission electricity from coal and ii) the large-scale synthesis of carbon nanotubes. Feedback from course evaluations suggest students find the course difficult, but value the generic attributes the teaching and learning style helps to develop.