研究领域

Physical Chemistry

The focus of Dr. Perahia¹s research is the study of polymers and complex fluids. A physical chemistry approach is applied to study the structure and dynamics of polymers and different complex fluids. Polymers with different properties are studied, including: 1)polyelectrolytes, 2) semifluoro polymeric liquid crystals, 3)conducting polymers, 4) rodlike highly conjugated polymers, and 5) onodispersed di-block and tri-block co-polymers. The technological significance of the interfacial behavior of polymers lies in their multiple uses, such as surface modifiers, lubricants and adhesives. They are also used as coatings with well-defined electro optical and mechanical properties. The polymer physics group led by Dr. Perahia uses scattering techniques, including X-ray and neutron scattering, as well as surface probes techniques, such as atomic force microscopy, to study these systems. Further instrumentation development is conducted to probe specific systems.

近期论文

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Perahia, Dvora; Aryal, Dipal; Grest, Gary S. From a single molecule to a membrane of structured ionic polymers: a molecular dynamics simulation study Polymer Preprints (American Chemical Society, Division of Polymer Chemistry) (2012), 53(2), 81-82. Dvora Perahia , Dilru R. Ratnaweera, Umesh M. Shrestha, Scott T. Iacono, Dennis W. Smith, Joseph Mabry, Jaroslaw Majewski Semi-Fluorinated Polymer/POSS Thin Films Nanocomposites: Response to Water. Advances in Fluorine-Containing Polymers Chapter 6, pp 81–93 ACS Symposium Series, Vol. 1106 August 16, 2012 Ratnaweera DR, Shrestha UM, Osti N, Kuo CM, Clarson S, Littrell K, & Perahia D (2012) Self-assembly of a semi-fluorinated diblock copolymer in a selective solvent. Soft Matter 8(7):2176-2184. Pierce, F.; Perahia, D.; Grest, G. S., Dynamics of polymers across an interface. Epl 2011, 95 (4). Maskey, S.; Pierce, F.; Perahia, D.; Grest, G. S., Conformational study of a single molecule of poly para phenylene ethynylenes in dilute solutions. Journal of Chemical Physics 2011, 134 (24). Tennyson, E. G.; He, S.; Osti, N. C.; Perahia, D.; Smith, R. C., Luminescent phosphonium polyelectrolyte prepared from a diphosphine chromophore: synthesis, photophysics, and layer-by-layer assembly. Journal of Materials Chemistry 2010, 20 (37), 7984-7989. Traiphol, R.; Charoenthai, N.; Srikhirin, T.; Perahia, D., Self-assembling into interconnected nanoribbons in thin films of hairy rod poly(9,9-di(2-ethylhexyl)fluorene): Effects of concentration, substrate and solvent. Synthetic Metals 2010, 160 (11-12), 1318-1324. He, L. L.; Fujimoto, C. H.; Cornelius, C. J.; Perahia, D., From Solutions to Membranes: Structure Studies of Sulfonated Polyphenylene Ionomers. Macromolecules 2009, 42 (18), 7084-7090. He, L. L.; Smith, H. L.; Majewski, J.; Fujimoto, C. H.; Cornelius, C. J.; Perahia, D., Interfacial Effects on Water Penetration into Ultrathin Ionomer Films: An in Situ Study Using Neutron Reflectometry. Macromolecules 2009, 42 (15), 5745-5751. Pierce, F.; Perahia, D.; Grest, G. S., Interdiffusion of Short Chain Oligomers into an Entangled Polymer Film. Macromolecules 2009, 42 (20), 7969-7973. Pierce, F.; Perahia, D.; Grest, G. S., Spreading of liquid droplets on permeable polymeric surfaces. Epl 2009, 86 (6). Pierce, F.; Tsige, M.; Borodin, O.; Perahia, D.; Grest, G. S., Interfacial properties of semifluorinated alkane diblock copolymers. Journal of Chemical Physics 2008, 128 (21). Pierce, F.; Tsige, M.; Perahia, D.; Grest, G. S., Liquid-Liquid Interfaces of Semifluorinated Alkane Diblock Copolymers with Water, Alkanes, and Perfluorinated Alkanes. Journal of Physical Chemistry B 2008, 112 (50), 16012-16020. Traiphol, R., H. Shah, D.W. Smith, and D. Perahia, Bulk and interfacial studies of a new and versatile semifluorinated lyotropic liquid crystalline polymer. Macromolecules, 2001. 34(12): p. 3954-3961. Perahia, D., R. Traiphol, and U.H.F. Bunz, From molecules to supramolecular structure: Self assembling of wirelike poly(p-phenyleneethynylene)s. Macromolecules, 2001. 34(2): p. 151-155. Smith, D.W., H.W. Boone, R. Traiphol, H. Shah, and D. Perahia, Perfluorocyclobutyl liquid crystalline fluoropolymers. Synthesis and thermal cyclopolymerization of bis(trifluorovinyloxy)-alpha-methylstilbene. Macromolecules, 2000. 33(4): p. 1126-1128. Smith, D.W., D.A. Babb, H.V. Shah, A. Hoeglund, R. Traiphol, D. Perahia, H.W. Boone, C. Langhoff, and M. Radler, Perfluorocyclobutane (PFCB) polyaryl ethers: versatile coatings materials. Journal of Fluorine Chemistry, 2000. 104(1): p. 109-117.