Mesoscopic tapes formed by amphiphilic two-dimensional colloids on water surface

Masahito Sano, Ayumi Kamino, Seiji Shinkai

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

A two-dimensional (2D) analogue of 3D fibrous supramolecular assemblies was formed spontaneously on the water surface by a short chain carboxyazobenzene derivative. It is a mesoscopic tape 1 nm thick, 80 nm wide, and can be as long as 0.1 mm. The tapes are obtained as Langmuir-Blodgett (LB) films on mica and examined by atomic force microscopy (AFM). AFM images exhibit complex internal structures, indicating that the tapes are not single crystals. They are not produced by LB processes, such as compression and lifting, and are not induced by the mica surface. The mesoscopic tape is self-contained and exists independent of surface pressure whose equilibrium value is nearly zero. UV - vis reflection spectroscopy on the water surface shows a peak at 305 nm. Increasing the water temperature to above 30°C or leaving the film on the water surface for 14 h caused the tapes to disintegrate into small clusters and the UV - vis peak to shift to 365 nm. The concentration at which the solvent evaporates controls the tape formation. At low concentrations, the tapes coexist with the domains of an ordinary phase. Then, there is a critical aggregation concentration at 8 nm2/molecule that the tape fraction increases abruptly. These results suggest that the tape is closely related to associations of 2D clusters.

Original languageEnglish
Pages (from-to)13-15
Number of pages3
JournalLangmuir
Volume15
Issue number1
Publication statusPublished - Jan 5 1999
Externally publishedYes

Fingerprint

Colloids
surface water
Tapes
tapes
colloids
Water
Mica
mica
Atomic force microscopy
atomic force microscopy
water temperature
Langmuir Blodgett films
Langmuir-Blodgett films
assemblies
low concentrations
Agglomeration
Single crystals
Spectroscopy
analogs
Derivatives

All Science Journal Classification (ASJC) codes

  • Colloid and Surface Chemistry
  • Physical and Theoretical Chemistry

Cite this

Sano, M., Kamino, A., & Shinkai, S. (1999). Mesoscopic tapes formed by amphiphilic two-dimensional colloids on water surface. Langmuir, 15(1), 13-15.

Mesoscopic tapes formed by amphiphilic two-dimensional colloids on water surface. / Sano, Masahito; Kamino, Ayumi; Shinkai, Seiji.

In: Langmuir, Vol. 15, No. 1, 05.01.1999, p. 13-15.

Research output: Contribution to journalArticle

Sano, M, Kamino, A & Shinkai, S 1999, 'Mesoscopic tapes formed by amphiphilic two-dimensional colloids on water surface', Langmuir, vol. 15, no. 1, pp. 13-15.
Sano, Masahito ; Kamino, Ayumi ; Shinkai, Seiji. / Mesoscopic tapes formed by amphiphilic two-dimensional colloids on water surface. In: Langmuir. 1999 ; Vol. 15, No. 1. pp. 13-15.
@article{6fc72f92102346f9b6555d19322a5208,
title = "Mesoscopic tapes formed by amphiphilic two-dimensional colloids on water surface",
abstract = "A two-dimensional (2D) analogue of 3D fibrous supramolecular assemblies was formed spontaneously on the water surface by a short chain carboxyazobenzene derivative. It is a mesoscopic tape 1 nm thick, 80 nm wide, and can be as long as 0.1 mm. The tapes are obtained as Langmuir-Blodgett (LB) films on mica and examined by atomic force microscopy (AFM). AFM images exhibit complex internal structures, indicating that the tapes are not single crystals. They are not produced by LB processes, such as compression and lifting, and are not induced by the mica surface. The mesoscopic tape is self-contained and exists independent of surface pressure whose equilibrium value is nearly zero. UV - vis reflection spectroscopy on the water surface shows a peak at 305 nm. Increasing the water temperature to above 30°C or leaving the film on the water surface for 14 h caused the tapes to disintegrate into small clusters and the UV - vis peak to shift to 365 nm. The concentration at which the solvent evaporates controls the tape formation. At low concentrations, the tapes coexist with the domains of an ordinary phase. Then, there is a critical aggregation concentration at 8 nm2/molecule that the tape fraction increases abruptly. These results suggest that the tape is closely related to associations of 2D clusters.",
author = "Masahito Sano and Ayumi Kamino and Seiji Shinkai",
year = "1999",
month = "1",
day = "5",
language = "English",
volume = "15",
pages = "13--15",
journal = "Langmuir",
issn = "0743-7463",
publisher = "American Chemical Society",
number = "1",

}

TY - JOUR

T1 - Mesoscopic tapes formed by amphiphilic two-dimensional colloids on water surface

AU - Sano, Masahito

AU - Kamino, Ayumi

AU - Shinkai, Seiji

PY - 1999/1/5

Y1 - 1999/1/5

N2 - A two-dimensional (2D) analogue of 3D fibrous supramolecular assemblies was formed spontaneously on the water surface by a short chain carboxyazobenzene derivative. It is a mesoscopic tape 1 nm thick, 80 nm wide, and can be as long as 0.1 mm. The tapes are obtained as Langmuir-Blodgett (LB) films on mica and examined by atomic force microscopy (AFM). AFM images exhibit complex internal structures, indicating that the tapes are not single crystals. They are not produced by LB processes, such as compression and lifting, and are not induced by the mica surface. The mesoscopic tape is self-contained and exists independent of surface pressure whose equilibrium value is nearly zero. UV - vis reflection spectroscopy on the water surface shows a peak at 305 nm. Increasing the water temperature to above 30°C or leaving the film on the water surface for 14 h caused the tapes to disintegrate into small clusters and the UV - vis peak to shift to 365 nm. The concentration at which the solvent evaporates controls the tape formation. At low concentrations, the tapes coexist with the domains of an ordinary phase. Then, there is a critical aggregation concentration at 8 nm2/molecule that the tape fraction increases abruptly. These results suggest that the tape is closely related to associations of 2D clusters.

AB - A two-dimensional (2D) analogue of 3D fibrous supramolecular assemblies was formed spontaneously on the water surface by a short chain carboxyazobenzene derivative. It is a mesoscopic tape 1 nm thick, 80 nm wide, and can be as long as 0.1 mm. The tapes are obtained as Langmuir-Blodgett (LB) films on mica and examined by atomic force microscopy (AFM). AFM images exhibit complex internal structures, indicating that the tapes are not single crystals. They are not produced by LB processes, such as compression and lifting, and are not induced by the mica surface. The mesoscopic tape is self-contained and exists independent of surface pressure whose equilibrium value is nearly zero. UV - vis reflection spectroscopy on the water surface shows a peak at 305 nm. Increasing the water temperature to above 30°C or leaving the film on the water surface for 14 h caused the tapes to disintegrate into small clusters and the UV - vis peak to shift to 365 nm. The concentration at which the solvent evaporates controls the tape formation. At low concentrations, the tapes coexist with the domains of an ordinary phase. Then, there is a critical aggregation concentration at 8 nm2/molecule that the tape fraction increases abruptly. These results suggest that the tape is closely related to associations of 2D clusters.

UR - http://www.scopus.com/inward/record.url?scp=0033524271&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0033524271&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:0033524271

VL - 15

SP - 13

EP - 15

JO - Langmuir

JF - Langmuir

SN - 0743-7463

IS - 1

ER -