Mesophase of colloidally dispersed nanosheets prepared by exfoliation of layered titanate and niobate

Teruyuki Nakato; Yoshie Yamashita; Kazuyuki Kuroda

doi:10.1016/j.tsf.2005.08.301

Mesophase of colloidally dispersed nanosheets prepared by exfoliation of layered titanate and niobate

Teruyuki Nakato^*, Yoshie Yamashita, Kazuyuki Kuroda

^*Corresponding author for this work

Research output: Contribution to journal › Conference article › peer-review

22 Citations (Scopus)

Abstract

Colloidal dispersion of oxide nanosheets was prepared by exfoliation of lepidocrocite-type layered titanate H_1.07Ti_1.73O ₄, and the obtained "nanosheet colloid" formed a liquid crystalline phase which was detected by birefringence of the colloid with naked-eye and optical microscope observations between crossed polarizers. The nanosheet colloids exhibited phase transition from isotropic to isotropic-liquid crystalline biphasic, and finally to full liquid crystalline, as the nanosheet concentration increased. The mesophase was characterized by the stability; liquid crystallinity appeared at low particle concentrations due to high aspect ratio (around 1 nm of thickness and ∼7 μm of lateral length) of the nanosheets. Mixing the titanate nanosheet colloid with hectorite clay yielded apparently homogeneous birefringent colloids, where a cationic cyanine dye was selectively adsorbed onto the clay nanosheets.

Original language	English
Pages (from-to)	24-28
Number of pages	5
Journal	Thin Solid Films
Volume	495
Issue number	1-2
DOIs	https://doi.org/10.1016/j.tsf.2005.08.301
Publication status	Published - 2006 Jan 20
Externally published	Yes

Keywords

Exfoliation
Liquid crystal
Monolayers
Titanium oxide

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Surfaces and Interfaces
Surfaces, Coatings and Films
Metals and Alloys
Materials Chemistry

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title = "Mesophase of colloidally dispersed nanosheets prepared by exfoliation of layered titanate and niobate",

abstract = "Colloidal dispersion of oxide nanosheets was prepared by exfoliation of lepidocrocite-type layered titanate H1.07Ti1.73O 4, and the obtained {"}nanosheet colloid{"} formed a liquid crystalline phase which was detected by birefringence of the colloid with naked-eye and optical microscope observations between crossed polarizers. The nanosheet colloids exhibited phase transition from isotropic to isotropic-liquid crystalline biphasic, and finally to full liquid crystalline, as the nanosheet concentration increased. The mesophase was characterized by the stability; liquid crystallinity appeared at low particle concentrations due to high aspect ratio (around 1 nm of thickness and ∼7 μm of lateral length) of the nanosheets. Mixing the titanate nanosheet colloid with hectorite clay yielded apparently homogeneous birefringent colloids, where a cationic cyanine dye was selectively adsorbed onto the clay nanosheets.",

keywords = "Exfoliation, Liquid crystal, Monolayers, Titanium oxide",

author = "Teruyuki Nakato and Yoshie Yamashita and Kazuyuki Kuroda",

note = "Funding Information: We thank Dr. N. Miyamoto (Japan Atomic Energy Research Institute) for fruitful discussion. We are also grateful to J. Sugawara and S. Yamamoto (Tokyo University of Agriculture and Technology) for their assistance with the TEM observation. This work was supported by a Grant-in-Aid for Scientific Research (No. 16350107) from the Ministry of Education, Culture, Sports, Science and Technology, Japan.",

year = "2006",

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doi = "10.1016/j.tsf.2005.08.301",

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AU - Nakato, Teruyuki

AU - Yamashita, Yoshie

AU - Kuroda, Kazuyuki

N1 - Funding Information: We thank Dr. N. Miyamoto (Japan Atomic Energy Research Institute) for fruitful discussion. We are also grateful to J. Sugawara and S. Yamamoto (Tokyo University of Agriculture and Technology) for their assistance with the TEM observation. This work was supported by a Grant-in-Aid for Scientific Research (No. 16350107) from the Ministry of Education, Culture, Sports, Science and Technology, Japan.

PY - 2006/1/20

Y1 - 2006/1/20

N2 - Colloidal dispersion of oxide nanosheets was prepared by exfoliation of lepidocrocite-type layered titanate H1.07Ti1.73O 4, and the obtained "nanosheet colloid" formed a liquid crystalline phase which was detected by birefringence of the colloid with naked-eye and optical microscope observations between crossed polarizers. The nanosheet colloids exhibited phase transition from isotropic to isotropic-liquid crystalline biphasic, and finally to full liquid crystalline, as the nanosheet concentration increased. The mesophase was characterized by the stability; liquid crystallinity appeared at low particle concentrations due to high aspect ratio (around 1 nm of thickness and ∼7 μm of lateral length) of the nanosheets. Mixing the titanate nanosheet colloid with hectorite clay yielded apparently homogeneous birefringent colloids, where a cationic cyanine dye was selectively adsorbed onto the clay nanosheets.

AB - Colloidal dispersion of oxide nanosheets was prepared by exfoliation of lepidocrocite-type layered titanate H1.07Ti1.73O 4, and the obtained "nanosheet colloid" formed a liquid crystalline phase which was detected by birefringence of the colloid with naked-eye and optical microscope observations between crossed polarizers. The nanosheet colloids exhibited phase transition from isotropic to isotropic-liquid crystalline biphasic, and finally to full liquid crystalline, as the nanosheet concentration increased. The mesophase was characterized by the stability; liquid crystallinity appeared at low particle concentrations due to high aspect ratio (around 1 nm of thickness and ∼7 μm of lateral length) of the nanosheets. Mixing the titanate nanosheet colloid with hectorite clay yielded apparently homogeneous birefringent colloids, where a cationic cyanine dye was selectively adsorbed onto the clay nanosheets.

KW - Exfoliation

KW - Liquid crystal

KW - Monolayers

KW - Titanium oxide

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Mesophase of colloidally dispersed nanosheets prepared by exfoliation of layered titanate and niobate

Abstract

Keywords

ASJC Scopus subject areas

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