MEMS SEMINAR: Plenty of Room at the Top: From Molecular to Macroscopic Chemical Patterning of Hard and Soft Materials
Abstract: Many problems in modern materials chemistry require highly structured chemical environments at near-molecular scales, integrated into larger micro-to-macroscopic constructs - ranging from nanoelectronics to ligand clustering in biology. However, approaches that are successful at achieving molecular-scale control are often difficult to extend across length scales, or into challenging chemically heterogeneous environments required for real function. Here, we describe a surprisingly robust and scalable route to achieve nm-to-macroscopic chemical patterning of materials based on amphiphilic striped phases, which can be assembled on graphite, graphene, MoS2, and other 2D materials. Recently, we have also demonstrated that these patterns can be assembled on hard, crystalline 2D materials, then transferred to soft, amorphous materials including PDMS and hydrogels. The transferred surface layer of fully extended, relatively rigid polydiacetylenes with functional headgroups confers both chemical and mechanical function, creating new opportunities for nanostructured material design in biology and wearable electronics. We will discuss the relationship between structure, assembly, and reactivity in the molecular template layer, as well as applications of the templates in directing the assembly of high-aspect-ratio inorganic nanocrystals and in designed cell scaffolds for regenerative medicine.
Shelley Claridge received undergraduate degrees in mathematics and biochemistry from Texas A&M University, and subsequently worked as a software engineer for six years prior to completing a Ph.D. at UC Berkeley with Paul Alivisatos and Jean Fréchet. After a postdoctoral fellowship with Paul Weiss at UCLA, she joined the faculty at Purdue University in 2013, and was promoted to Associate Professor with tenure in 2019. Her research at Purdue has been recognized with Young Investigator awards from NSF, DARPA (2017 Young Faculty Award and 2019 DARPA Director's Fellowship),NIH (Trailblazer), 3M, and DuPont (one of 8 globally in 2016), and most recently the Schmidt Science Polymaths Award (one of 10 globally across STEM fields). Work from her group has also been the subject of 7 granted patents and 6 additional pending patent applications to date.
Host: Christine Payne