Accession Number:

ADA464357

Title:

Quartz Crystal Microbalance Studies Of Dimethyl Methylphosphonate Sorption Into Trisilanolphenyl-Poss Films

Descriptive Note:

Master's thesis

Corporate Author:

VIRGINIA POLYTECHNIC INST AND STATE UNIV BLACKSBURG DEPT OF PHYSICS

Personal Author(s):

Report Date:

2006-11-06

Pagination or Media Count:

84.0

Abstract:

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.

Subject Categories:

  • Organic Chemistry
  • Chemical, Biological and Radiological Warfare
  • Atomic and Molecular Physics and Spectroscopy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE