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) : Kittle, Joshua D


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a464357.pdf


Report Date : 06 Nov 2006


Pagination or Media Count : 84


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 1:1 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.


Descriptors :   *INFRARED SPECTROSCOPY , *X RAY PHOTOELECTRON SPECTROSCOPY , *SORPTION , *MICROBALANCES , REACTION KINETICS , METHYL RADICALS , VACUUM , THESES , ABSORPTION SPECTRA , CHEMICAL WARFARE AGENTS , DESORPTION , PHOSPHONATES , CRYSTALS , REFLECTION , ROOM TEMPERATURE , SATURATION , QUARTZ


Subject Categories : Organic Chemistry
      Chemical, Biological and Radiological Warfare
      Atomic and Molecular Physics and Spectroscopy


Distribution Statement : APPROVED FOR PUBLIC RELEASE