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Harada T, Suzuki Y, Nakato T, Breu J, Kawamata J. Real-Time Monitoring of Adsorption-Induced Scrolling of Colloidal Inorganic Nanosheets. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:9189-9196. [PMID: 38637013 DOI: 10.1021/acs.langmuir.4c00560] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/20/2024]
Abstract
Inorganic nanotubes have attracted much attention due to their unique physicochemical properties. Nanotubes can be prepared by scrolling exfoliated nanosheets under ambient conditions. However, how the nanosheet scrolled in its colloidal state has not been experimentally visualized. In this paper, we directly observed the scrolling process of nanosheets upon adsorption of organic cations. Exfoliated flat nanosheets of niobate and clay in aqueous colloids were found to scroll by adding organic cations, such as exfoliation reagents, to the colloids. Employment of cationic stilbazolium dye enabled in situ observation of the dye adsorption and scrolling by optical microscopy based on changes in color and morphology of the nanosheets. The scrolling was promoted for nanosheets adsorbed with a stilbazolium dye with a longer alkyl chain, suggesting that the interaction between the hydrophobic parts of the dye cations is the driving force of the scrolling. This finding should encourage research on the formation of nanotubes from nanosheets and also provides important guidelines for the selection of appropriate exfoliation reagents when exfoliating nanosheets from layered crystals.
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Affiliation(s)
- Takumi Harada
- Graduate School of Sciences and Technology for Innovation, Yamaguchi University, Yoshida, Yamaguchi 753-8512, Japan
| | - Yasutaka Suzuki
- Graduate School of Sciences and Technology for Innovation, Yamaguchi University, Yoshida, Yamaguchi 753-8512, Japan
| | - Teruyuki Nakato
- Department of Applied Chemistry, Kyushu Institute of Technology, 1-1 Sensui-cho, Tobata, Kitakyushu, Fukuoka 804-8550, Japan
| | - Josef Breu
- Bavarian Polymer Institute and Department of Chemistry, University of Bayreuth, 95447 Bayreuth, Germany
| | - Jun Kawamata
- Graduate School of Sciences and Technology for Innovation, Yamaguchi University, Yoshida, Yamaguchi 753-8512, Japan
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Suzuki Y, Nagashita T, Ikeda A, Ishii K, Iwai T, Nakato T, Kawamata J. Formation of a Giant Anisotropically Ordered Assembled Structure of Inorganic Nanosheets through an Optically Induced Stream. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:6647-6652. [PMID: 35579556 DOI: 10.1021/acs.langmuir.2c00528] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Formation of a desirable submillimeter-scaled assembled structure of particles in the colloid is a difficult subject in colloidal chemistry. Herein, a submillimeter-scaled ordered assembled structure consisting of highly anisotropic two-dimensional plate-like particles, niobate nanosheets, was obtained through an optical manipulation technique that was assisted by a scattering-force-induced stream. A 532 nm continuous wave laser beam with a power of 400 mW was used to illuminate a liquid crystalline niobate nanosheet colloid from the bottom side of a sample cell, inducing the stream of oriented nanosheets toward the upper side of the sample cell. As a result, a 200 μm ordered assembled structure consisting of oriented nanosheets was formed. The assembled structure was also characterized by two-dimensional anisotropy, reflecting that the highly anisotropic morphologies of each nanosheet and the shape of that structure were dependent on the polarization of incident illumination. This study has revealed a new noncontact and on-demand way to obtain submillimeter-scaled ordered anisotropic colloidal assembled structures of nanosized particles such as nanosheets, contributing to fundamental materials science and expanding the utilities of nanosheets.
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Affiliation(s)
- Yasutaka Suzuki
- Graduate School of Sciences and Technology for Innovation, Yamaguchi University, 1677-1 Yoshida, Yamaguchi, Yamaguchi 753-8512, Japan
| | - Takashi Nagashita
- Graduate School of Sciences and Technology for Innovation, Yamaguchi University, 1677-1 Yoshida, Yamaguchi, Yamaguchi 753-8512, Japan
| | - Akira Ikeda
- Graduate School of Sciences and Technology for Innovation, Yamaguchi University, 1677-1 Yoshida, Yamaguchi, Yamaguchi 753-8512, Japan
| | - Katsuhiro Ishii
- The Graduate School for the Creation of New Photonics Industries, 1955-1 Kurematsu, Hamamatsu, Shizuoka 431-1202, Japan
| | - Toshiaki Iwai
- Graduate School of Bio-Applications and Systems Engineering, Tokyo University of Agriculture and Technology, 2-24-16 Naka-cho, Koganei, Tokyo 184-8588, Japan
| | - Teruyuki Nakato
- Department of Applied Chemistry, Strategic Research Unit for Innovative Multiscale Materials, Kyushu Institute of Technology, 1-1 Sensui-cho, Tobata, Kitakyu-shu, Fukuoka 804-8550, Japan
| | - Jun Kawamata
- Graduate School of Sciences and Technology for Innovation, Yamaguchi University, 1677-1 Yoshida, Yamaguchi, Yamaguchi 753-8512, Japan
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Ban T, Asano K, Takai-Yamashita C, Ohya Y. Bottom-up synthesis of titanophosphate nanosheets by the aqueous solution process. NANOSCALE ADVANCES 2020; 2:3542-3549. [PMID: 36134261 PMCID: PMC9417843 DOI: 10.1039/d0na00376j] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/08/2020] [Accepted: 07/07/2020] [Indexed: 06/16/2023]
Abstract
The synthesis of titanophosphate nanosheets in aqueous sols was examined by the bottom-up process. The nanosheets were formed by mixing titanium iso-propoxide, phosphoric acid, and tetraalkylammonium hydroxide (NR4OH) aqueous solutions, followed by diluting with water and heating at 80 °C, forming translucent aqueous sols of titanophosphate nanosheets with the same crystal structure as layered titanium phosphate Ti2O3(H2PO4)2·2H2O. Whether the nanosheets were crystallized depended on the reactions during the mixing of reagents before the water dilution. By controlling the acid-base reactions between the Ti species, phosphoric acid, and the hydroxides of bulky cations in the aqueous sols, the one-pot process yielded highly water-dispersible, flake-like titanophosphate nanosheets. Under some synthetic conditions, nanosheets formed even in weakly basic aqueous sols. These nanosheets can be coated on a substrate with low alkali-resistance, or used for the removal of metal ions from neutral aqueous solutions.
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Affiliation(s)
- Takayuki Ban
- Department of Chemistry and Biomolecular Science, Gifu University Yanagido 1-1 Gifu 501-1193 Japan +81-58-293-2585
| | - Keito Asano
- Department of Chemistry and Biomolecular Science, Gifu University Yanagido 1-1 Gifu 501-1193 Japan +81-58-293-2585
| | - Chika Takai-Yamashita
- Department of Chemistry and Biomolecular Science, Gifu University Yanagido 1-1 Gifu 501-1193 Japan +81-58-293-2585
| | - Yutaka Ohya
- Department of Chemistry and Biomolecular Science, Gifu University Yanagido 1-1 Gifu 501-1193 Japan +81-58-293-2585
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Niu B, Li M, Jia J, Zhang C, Fan YY, Li W. Hydrophobin-enhanced stability, dispersions and release of curcumin nanoparticles in water. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2020; 31:1793-1805. [PMID: 32510282 DOI: 10.1080/09205063.2020.1775761] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
Most chemotherapeutic drugs commonly suffer from low aqueous solubility that can potentially limit drugs absorption. Drug nanomerization is an advanced approach to overcoming their poor water-solubility. In this study, class I hydrophobin recombinant HGFI (rHGFI)-based curcumin (Cur) nanoparticles (rHGFI-Cur) were prepared by freeze-drying method. The rHGFI-Cur nanocomposites were characterized by contact angle, transmission electron microscopy, fluorescence microscopy and dynamic light scattering. The results showed that rHGFI could lead to the wettability conversion and stability improved of Cur in water. X-ray photoelectron spectroscopy and Fourier transform infrared suggested that rHGFI could non-covalently bind to Cur to render them hydrophilic through hydrophobic forces. Additionally, drug release and cytotoxicity assays illustrated that rHGFI-Cur nanoparticles could facilitate Cur release and exhibited higher cytotoxicity than free Cur for human esophageal cancer cells TE-1. Thus, it suggested that rHGFI has a great potential application for hydrophobic drug delivery without toxicity.[Formula: see text].
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Affiliation(s)
- Baolong Niu
- School of Basic Medical Sciences, Shanxi Medical University, Taiyuan, P. R. China.,College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan, P. R. China
| | - Meilin Li
- College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan, P. R. China
| | - Jianhong Jia
- College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan, P. R. China
| | - Ce Zhang
- School of Basic Medical Sciences, Shanxi Medical University, Taiyuan, P. R. China
| | - Yan-Ying Fan
- School of Basic Medical Sciences, Shanxi Medical University, Taiyuan, P. R. China
| | - Wenfeng Li
- College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan, P. R. China
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