Accession Number : ADA306943

Title :   The Structure of LB Deposited Films on Diacetylenes.

Descriptive Note : Technical rept.,

Corporate Author : KENT STATE UNIV OH LIQUID CRYSTAL INST

Personal Author(s) : Johnson, David ; Lando, Jerome B. ; Mann, J. A., Jr

PDF Url : ADA306943

Report Date : 1995

Pagination or Media Count : 4

Abstract : We have examined the structure of various diacetylene monolayers and multilayers deposited by the Langmuir Blodgett technique or one of its variations. Various experimental techniques were used including x-ray diffraction, electron diffraction (ED), and scanning force microscopy (SFM). In particular salts of the monomers CH3-(CH2)n-C(triple bonds)C-(CH2)m-COOH were deposited and polymerized by exposure to UV light. The purpose of this paper is to compare the information obtained by these three tools for determining structure of LB films. Monomer unit mesh: SFM; a= 0.51 plus or minus 0.04 nm, b=0.88 plus or minus 0.06 nm, rectangular centered net. ED; a=0.483 nm, b=0.92 nm, rectangular net 2-D, orthorhombic 3-D lattice. The area per molecule is 0.224 nm squared and 0.222 nm squared per molecule respectively. Polymer unit mesh: Here there is a discrepancy between the SFM and ED data. SFM; a=0.466 plus or minus .008nm, b=0.55 plus or minus .01 nm theta=100 plus or minus 2 deg, oblique net mesh area = 0.252 nm squared/molecule. ED; a=0.489nm, b=0.811 nm, rectangular net mesh area = 0.198 nm squared/molecule. These data will be discussed. p1

Descriptors :   *FILMS, *DEPOSITION, *MOLECULAR STRUCTURE, SCANNING, REPRINTS, ULTRAVIOLET RADIATION, EXPOSURE(GENERAL), TOOLS, POLYMERS, X RAY DIFFRACTION, LIGHT, TEST METHODS, MICROSCOPY, CHEMICAL BONDS, HYDROCARBONS, RECTANGULAR BODIES, MONOMERS, ACETYLENE, SALTS, ELECTRON DIFFRACTION.

Subject Categories : Organic Chemistry
      Polymer Chemistry
      Atomic and Molecular Physics and Spectroscopy

Distribution Statement : APPROVED FOR PUBLIC RELEASE