High molecular orientation in mono- and tri-layer polydiacetylene films imaged by atomic force microscopy

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Description

Atomically flat monolayer and trilayer films of polydiacetylenes have been prepared on mica and silicon using a horizontal deposition technique from a pure water subphase. Langmuir films of 10,12-pentacosadiynoic acid (I) and N-(2-ethanol)-10,12-pentacosadiynamide (II) were compressed to 20 mN/m and subsequently polymerized by UV irradiation at the air-water interface. Blue and red forms of the films were prepared by varying exposure times and incident power. Polymerization to the blue-phase films produced slight contractions in the film of 2 and 5% for the films of II and I, respectively. Longer UV exposures yielded red-phase films with dramatic film contraction of 15 ... continued below

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27 p.

Creation Information

SASAKI,DARRYL Y.; CARPICK,ROBERT W. & BURNS,ALAN R. March 6, 2000.

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  • Sandia National Laboratories
    Publisher Info: Sandia National Labs., Albuquerque, NM, and Livermore, CA (United States)
    Place of Publication: Albuquerque, New Mexico

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Description

Atomically flat monolayer and trilayer films of polydiacetylenes have been prepared on mica and silicon using a horizontal deposition technique from a pure water subphase. Langmuir films of 10,12-pentacosadiynoic acid (I) and N-(2-ethanol)-10,12-pentacosadiynamide (II) were compressed to 20 mN/m and subsequently polymerized by UV irradiation at the air-water interface. Blue and red forms of the films were prepared by varying exposure times and incident power. Polymerization to the blue-phase films produced slight contractions in the film of 2 and 5% for the films of II and I, respectively. Longer UV exposures yielded red-phase films with dramatic film contraction of 15 and 32% for II and I, respectively. The horizontal deposition technique provided transfer ratios of unity with minimal film stress or structure modification. Atomic force microscopy images revealed nearly complete coverage of the substrate with atomically flat films. Crystalline domains of up to 100 microns of highly oriented polydiacetylene molecules were observed. The results reported herein provided insight into the roles of molecular packing and chain orientations in converting the monomeric film to the polymerized blue- and red-phases.

Physical Description

27 p.

Notes

OSTI as DE00752066

Medium: P; Size: 27 pages

Source

  • Journal Name: Journal of Colloid and Interface Science; Other Information: Submitted to Journal of Colloid and Interface Science

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  • Report No.: SAND2000-0569J
  • Grant Number: AC04-94AL85000
  • Office of Scientific & Technical Information Report Number: 752066
  • Archival Resource Key: ark:/67531/metadc710326

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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Creation Date

  • March 6, 2000

Added to The UNT Digital Library

  • Sept. 12, 2015, 6:31 a.m.

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  • April 10, 2017, 6:40 p.m.

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SASAKI,DARRYL Y.; CARPICK,ROBERT W. & BURNS,ALAN R. High molecular orientation in mono- and tri-layer polydiacetylene films imaged by atomic force microscopy, article, March 6, 2000; Albuquerque, New Mexico. (digital.library.unt.edu/ark:/67531/metadc710326/: accessed December 11, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.