Hierarchical structures in mesoscopic fibers that are self-organized by monolayer nano-clusters

M. Sano, A. Kamino, S. Shinkai

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Hierarchical structures in fibrous assemblies self-organized from nanometre-sized monolayer clusters are elucidated. Langmuir monolayers of a short chain carboxyazobenzene derivative feature mesoscopic fibrous structures, a monolayer thick, 80 nm apparent width, and over 100 μm long when transferred onto mica from the air-water interface. The effects of pH and salts on the large-scale morphology are followed by atomic force microscopy (AFM) and those of molecular-scale orientation are probed by UV-vis spectroscopy. The large morphological changes, despite no evidence of molecular reorientation, indicate that a small monolayer cluster, rather than a single molecule, is the relevant unit making up a fiber. Furthermore, detailed statistical analyses of the images reveal that nearly all fibers actually consist of a pair of strands, each strand 29 nm wide, that are imaged by the AFM tip, having an effective apex size of 21 nm. The results suggest the following hierarchical structure. Molecules aggregate into a monolayer cluster 29 nm wide. These clusters associate one-dimensionally to form a long monolayer strand. Finally, two strands join together to result in a fiber with a true width of 58 nm.

Original languageEnglish
Pages (from-to)444-447
Number of pages4
JournalPhysical Chemistry Chemical Physics
Volume3
Issue number3
DOIs
Publication statusPublished - Feb 1 2001

Fingerprint

strands
Monolayers
fibers
Fibers
atomic force microscopy
monomolecular films
Atomic force microscopy
mica
retraining
self assembly
molecules
apexes
Molecules
salts
Ultraviolet spectroscopy
Self assembly
air
Salts
water
spectroscopy

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

Cite this

Hierarchical structures in mesoscopic fibers that are self-organized by monolayer nano-clusters. / Sano, M.; Kamino, A.; Shinkai, S.

In: Physical Chemistry Chemical Physics, Vol. 3, No. 3, 01.02.2001, p. 444-447.

Research output: Contribution to journalArticle

@article{367b9a5260b842c5ae95c460594c33d5,
title = "Hierarchical structures in mesoscopic fibers that are self-organized by monolayer nano-clusters",
abstract = "Hierarchical structures in fibrous assemblies self-organized from nanometre-sized monolayer clusters are elucidated. Langmuir monolayers of a short chain carboxyazobenzene derivative feature mesoscopic fibrous structures, a monolayer thick, 80 nm apparent width, and over 100 μm long when transferred onto mica from the air-water interface. The effects of pH and salts on the large-scale morphology are followed by atomic force microscopy (AFM) and those of molecular-scale orientation are probed by UV-vis spectroscopy. The large morphological changes, despite no evidence of molecular reorientation, indicate that a small monolayer cluster, rather than a single molecule, is the relevant unit making up a fiber. Furthermore, detailed statistical analyses of the images reveal that nearly all fibers actually consist of a pair of strands, each strand 29 nm wide, that are imaged by the AFM tip, having an effective apex size of 21 nm. The results suggest the following hierarchical structure. Molecules aggregate into a monolayer cluster 29 nm wide. These clusters associate one-dimensionally to form a long monolayer strand. Finally, two strands join together to result in a fiber with a true width of 58 nm.",
author = "M. Sano and A. Kamino and S. Shinkai",
year = "2001",
month = "2",
day = "1",
doi = "10.1039/b008760m",
language = "English",
volume = "3",
pages = "444--447",
journal = "Physical Chemistry Chemical Physics",
issn = "1463-9076",
publisher = "Royal Society of Chemistry",
number = "3",

}

TY - JOUR

T1 - Hierarchical structures in mesoscopic fibers that are self-organized by monolayer nano-clusters

AU - Sano, M.

AU - Kamino, A.

AU - Shinkai, S.

PY - 2001/2/1

Y1 - 2001/2/1

N2 - Hierarchical structures in fibrous assemblies self-organized from nanometre-sized monolayer clusters are elucidated. Langmuir monolayers of a short chain carboxyazobenzene derivative feature mesoscopic fibrous structures, a monolayer thick, 80 nm apparent width, and over 100 μm long when transferred onto mica from the air-water interface. The effects of pH and salts on the large-scale morphology are followed by atomic force microscopy (AFM) and those of molecular-scale orientation are probed by UV-vis spectroscopy. The large morphological changes, despite no evidence of molecular reorientation, indicate that a small monolayer cluster, rather than a single molecule, is the relevant unit making up a fiber. Furthermore, detailed statistical analyses of the images reveal that nearly all fibers actually consist of a pair of strands, each strand 29 nm wide, that are imaged by the AFM tip, having an effective apex size of 21 nm. The results suggest the following hierarchical structure. Molecules aggregate into a monolayer cluster 29 nm wide. These clusters associate one-dimensionally to form a long monolayer strand. Finally, two strands join together to result in a fiber with a true width of 58 nm.

AB - Hierarchical structures in fibrous assemblies self-organized from nanometre-sized monolayer clusters are elucidated. Langmuir monolayers of a short chain carboxyazobenzene derivative feature mesoscopic fibrous structures, a monolayer thick, 80 nm apparent width, and over 100 μm long when transferred onto mica from the air-water interface. The effects of pH and salts on the large-scale morphology are followed by atomic force microscopy (AFM) and those of molecular-scale orientation are probed by UV-vis spectroscopy. The large morphological changes, despite no evidence of molecular reorientation, indicate that a small monolayer cluster, rather than a single molecule, is the relevant unit making up a fiber. Furthermore, detailed statistical analyses of the images reveal that nearly all fibers actually consist of a pair of strands, each strand 29 nm wide, that are imaged by the AFM tip, having an effective apex size of 21 nm. The results suggest the following hierarchical structure. Molecules aggregate into a monolayer cluster 29 nm wide. These clusters associate one-dimensionally to form a long monolayer strand. Finally, two strands join together to result in a fiber with a true width of 58 nm.

UR - http://www.scopus.com/inward/record.url?scp=0035252936&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0035252936&partnerID=8YFLogxK

U2 - 10.1039/b008760m

DO - 10.1039/b008760m

M3 - Article

AN - SCOPUS:0035252936

VL - 3

SP - 444

EP - 447

JO - Physical Chemistry Chemical Physics

JF - Physical Chemistry Chemical Physics

SN - 1463-9076

IS - 3

ER -