Temperature-Dependent Phase Behavior of Langmuir Films of 10,12-Pentacosadiynoic Acid at the Air/Water Interface and Its Effects on Chromatic Stability of the Polymerized Langmuir-Schaefer Films
- Authors
- Lee, Gil Sun; Hyun, Sung Jun; Ahn, Dong June
- Issue Date
- 6월-2018
- Publisher
- SPRINGER
- Keywords
- polydiacetylene; polymerization temperature; chromatic stability; Langmuir films; Langmuir-Schaefer
- Citation
- MACROMOLECULAR RESEARCH, v.26, no.6, pp.566 - 570
- Indexed
- SCIE
SCOPUS
KCI
- Journal Title
- MACROMOLECULAR RESEARCH
- Volume
- 26
- Number
- 6
- Start Page
- 566
- End Page
- 570
- URI
- https://scholar.korea.ac.kr/handle/2021.sw.korea/75045
- DOI
- 10.1007/s13233-018-6071-7
- ISSN
- 1598-5032
- Abstract
- The effect of temperature on the two-dimensional phase of 10,12-pentacosadiynoic acid (PCDA) Langmuir films at the air/water interface was investigated. The temperature of the Langmuir films was precisely controlled from 5 to 50 A degrees C and their surface isotherms and in-situ visible absorption spectra were acquired. Depending on the temperature, the PCDA Langmuir films were found to be classified into a liquid-condensed (low temperatures, 5 and 25 A degrees C) and a liquid-expanded phase (high temperatures, 40 and 50 A degrees C). After polymerizing the PCDA Langmuir films with 254 nm UV light at the specific temperatures, the films were transferred to hydrophobic glass using the Langumir-Schaefer (LS) method. Upon thermal and pH stimuli, their chromatic transition characteristics were analyzed by visible spectroscopy. The liquid-condensed films were found to be more susceptible to thermal stimulus than the liquid-expanded films. The latter also showed remarkable chromatic stability against the pH in the region from 2 to 11, compared to the former. Thus, when sturdy films are required, the multilayered PCDA LS films prepared at the liquid-expanded phase are more suitable than the liquid-condensed films, and vice versa. This result is expected to be very useful for controlling the sensitivity and stability of polydiacetylene-based sensory systems simply by changing the polymerization temperature, even without synthesizing new monomers.
- Files in This Item
- There are no files associated with this item.
- Appears in
Collections - College of Engineering > Department of Chemical and Biological Engineering > 1. Journal Articles
Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.