Quartz Crystal Microbalance Studies Of Dimethyl Methylphosphonate Sorption Into Trisilanolphenyl-Poss Films
VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG DEPT OF PHYSICS
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Developing methods to detect, adsorb, and decompose chemical warfare agents CWAs is of critical importance to protecting military and civilian populations alike. The sorption of dimethyl methylphosphonate DMMP, a CWA simulant, into trisilanolphenyl-POSS TPP films has previously been characterized with reflection absorption infrared spectroscopy, x-ray photoelectron spectroscopy, and uptake coefficient determinations. In our study, the quartz crystal microbalance QCM is used to study the sorption phenomena of DMMP into highly ordered Langmuir-Blodgett LB films of TPP. In a saturated environment, DMMP sorbs into the TPP films, binding to TPP in a 11 molar ratio. Although previous work indicated these DMMP-saturated films were stable for several weeks, DMMP is found to slowly desorb from the TPP films at room temperature and pressure. Upon application of vacuum to the DMMP-saturated films, DMMP follows first-order desorption kinetics and readily desorbs from the film, returning the TPP film to its original state.
- Organic Chemistry
- Chemical, Biological and Radiological Warfare
- Atomic and Molecular Physics and Spectroscopy