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Mesoscale dynamics and cooperativity of networking dendronized nonlinear optical molecular glasses

Gray, Tomoko and Kim, Tae-Dong and Knorr, Daniel B. and Luo, Jingdong and Jen, Alex K. -Y. and Overney, Rene M. (2008) Mesoscale dynamics and cooperativity of networking dendronized nonlinear optical molecular glasses. NANO LETTERS, 8 (2). pp. 754-759.

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First, molecular scale insight into the mobility of a novel class of organic materials for photonic applications with electro-optical activities larger than 300 pm/V is presented. A representative second order nonlinear optical (NLO) material of this class of self-assembling molecular glasses involving quadrupolar phenyl-perfluorophenyl (Ph-Ph-F) interactions is analyzed based on its molecular relaxation phenomena and phase behavior. Thereby, a new and straightforward nanoscale methodology, involving shear modulation force microscopy and intrinsic friction analysis is introduced. It provides both the submolecular enthalpic and entropic dynamics in nanoconstrained systems (e.g., ultrathin films), and thus, insight into local motion of single molecules due to dissociation of Ph-PhF pairs as well as the cooperative dynamics of the assembled network. This nanoscale model-independent thermomechanical methodology is shown to be very effective in fundamentally evaluating appropriate poling conditions of organic NLO materials. It promises to be a straightforward analysis tool to guide organic material synthesis from a molecular mobility perspective, particularly for applications that impose nanoscale constraints on the system.

Item Type:Article
Subjects:Physical Science > Nanophysics
Material Science > Functional and hybrid materials
ID Code:1497
Deposited By:Farnush Anwar
Deposited On:11 Dec 2008 19:55
Last Modified:15 Jan 2009 11:19

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