In the Laaser Lab, we are interested in developing a physical understanding of how changes at the molecular level translate to the macroscopic properties of responsive polymeric materials. For example, how does a change in charge spacing affect the interactions between charged polymers, and at what point do the polymers stop behaving like isolated chains in solution and start behaving like part of a bulk material? How do orientational changes in single polymer chains propagate through a material to achieve macroscopic ordering? And how do polymeric networks transduce force, to achieve things like mechanochemical responses?
We explore these questions by a number of optical and spectroscopic methods, such as light scattering and Raman and infrared spectroscopy, along with classical materials characterization methods like rheology and electron microscopy. Together, these methods allow us to develop new understanding of the structure and dynamic properties of responsive polymeric materials, and offer students the opportunity to gain broad experience in both physical chemistry and polymer science.
- "Adding a dimension to the infrared spectra of interfaces using heterodyne detected 2D sum-frequency generation (HD 2D SFG) spectroscopy," Wei Xiong, Jennifer E. Laaser, Randy D. Mehlenbacher, and Martin T. Zanni, PNAS 108, 20902 (2011)
- "Transient 2D IR Spectroscopy of Charge Injection in Dye-Sensitized Nanocrystalline Thin Films," Wei Xiong, Jennifer E. Laaser, Peerasak Paoprasert, Ryan A. Franking, Robert J. Hamers, Padma Gopalanand Martin T. Zanni, J. Am. Chem. Soc. 131,18040 (2009)
- "Time-Domain SFG Spectroscopy Using Mid-IR Pulse Shaping: Practical and Intrinsic Advantages," Jennifer E. Laaser, Wei Xiong, and Martin T. Zanni, J. Phys. Chem. B 115, 2536 (2011)
- "Two-Dimensional Sum-Frequency Generation Reveals Structure and Dynamics of a Surface-Bound Peptide," Jennifer E. Laaser, David R. Skoff, Jia-Jung Ho, Yongho Joo, Arnaldo L. Serrano, Jay D. Steinkruger, Padma Gopalan, Samuel H. Gellman, and Martin T. Zanni, J. Am. Chem. Soc. 136, 95 (2014)
- "Bridge-Dependent Interfacial Electron Transfer from Rhenium−Bipyridine Complexes to TiO2 Nanocrystalline Thin Films," Peerasak Paoprasert, Jennifer E. Laaser, Wei Xiong, Ryan A. Franking, Robert J. Hamers, Martin T. Zanni, J. R. Schmidt and Padma Gopalan, J. Phys. Chem. C 114, 9898 (2010)
- "Equilibration of Micelle–Polyelectrolyte Complexes: Mechanistic Differences between Static and Annealed Charge Distributions," Jennifer E. Laaser, Michael McGovern, Yaming Jiang, Elise Lohmann, Theresa M. Reineke, David C. Morse, Kevin D. Dorfman, and Timothy P. Lodge, J. Phys. Chem. B, 121, 4631 (2017)
- "Architecture-Dependent Stabilization of Polyelectrolyte Complexes between Polyanions and Cationic Triblock Terpolymer Micelles," Jennifer E. Laaser, Elise Lohmann, Yaming Jiang, Theresa M. Reineke, and Timothy P. Lodge, Macromolecules 49, 6644 (2016)
- "Tuning Cationic Block Copolymer Micelle Size by pH and Ionic Strength," Dustin Sprouse, Yaming Jiang, Jennifer E. Laaser, Timothy P. Lodge, and Theresa M. Reineke, Biomacromolecules 17, 2849 (2016)
- "Interpolyelectrolyte Complexes of Polycationic Micelles and Linear Polyanions: Structural Stability and Temporal Evolution," Jennifer E. Laaser, Yaming Jiang, Shannon R. Petersen, Theresa M. Reineke, and Timothy P. Lodge, J. Phys. Chem. B 119, 15919 (2015)
- "Probing Site-Specific Structural Information of Peptides at Model Membrane Interface In Situ," Bei Ding, Afra Panahi, Jia-Jung Ho, Jennifer E. Laaser, Charles L. BrooksIII, Martin T. Zanni, and Zhan Chen, J. Am. Chem. Soc. 137, 10190 (2015)