Continuous synthesis of surface-modified zinc oxide nanoparticles in supercritical methanol

Bambang Veriansyah; Jae Duck Kim; Byoung Koun Min; Young Ho Shin; Youn Woo Lee; Jaehoon Kim

doi:10.1016/j.supflu.2009.11.010

Continuous synthesis of surface-modified zinc oxide nanoparticles in supercritical methanol

Bambang Veriansyah, Jae Duck Kim, Byoung Koun Min, Young Ho Shin, Youn Woo Lee, Jaehoon Kim

GREEN SCHOOL (Graduate School of Energy and Environment)

Research output: Contribution to journal › Article › peer-review

75 Citations (Scopus)

Abstract

Continuous synthesis of surface-modified zinc oxide (ZnO) nanoparticles was examined using surface modifiers (oleic acid and decanoic acid) in supercritical methanol at 400 °C, 30 MPa and a residence time of ∼40 s. Wide angle X-ray diffraction (WAXD) analysis revealed that the surface-modified nanoparticles retained ZnO crystalline structure. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) showed that the surface modifiers changed drastically the size and morphology of the ZnO nanoparticles. When the molar ratio of oleic acid to Zn precursor ratio was 30, 10 nm size particles with low degree of aggregation were produced. The surface-modified ZnO nanoparticles had higher BET surface areas (29-36 m²/g) compared to unmodified ZnO particles synthesized in supercritical water (0.7 m²/g). Fourier transform infrared (FT-IR) and thermogravimetric analysis (TGA) indicated that aliphatic, carboxylate and hydroxyl groups were chemically attached on the surface of ZnO nanoparticles. Long-term (80 days) dispersion test using ultraviolet transmittance showed that the surface-modified ZnO particles had enhanced dispersion stability in ethylene glycol. Crown

Original language	English
Pages (from-to)	76-83
Number of pages	8
Journal	Journal of Supercritical Fluids
Volume	52
Issue number	1
DOIs	https://doi.org/10.1016/j.supflu.2009.11.010
Publication status	Published - 2010 Feb

Bibliographical note

Funding Information:
This research was supported by Nano R&D program through the Korea Science and Engineering Foundation funded by the Ministry of Education, Science and Technology ( 2009-0083206 ). Partial support of the National Research Foundation of Korea Grant funded by the Korean Government (MEST) ( NRF-2009-C1AAA001-2009-0092935 ) is appreciated.

Keywords

Nanoparticles
Supercritical methanol
Surface modification
Zinc oxide

ASJC Scopus subject areas

General Chemical Engineering
Condensed Matter Physics
Physical and Theoretical Chemistry

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10.1016/j.supflu.2009.11.010

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title = "Continuous synthesis of surface-modified zinc oxide nanoparticles in supercritical methanol",

abstract = "Continuous synthesis of surface-modified zinc oxide (ZnO) nanoparticles was examined using surface modifiers (oleic acid and decanoic acid) in supercritical methanol at 400 °C, 30 MPa and a residence time of ∼40 s. Wide angle X-ray diffraction (WAXD) analysis revealed that the surface-modified nanoparticles retained ZnO crystalline structure. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) showed that the surface modifiers changed drastically the size and morphology of the ZnO nanoparticles. When the molar ratio of oleic acid to Zn precursor ratio was 30, 10 nm size particles with low degree of aggregation were produced. The surface-modified ZnO nanoparticles had higher BET surface areas (29-36 m2/g) compared to unmodified ZnO particles synthesized in supercritical water (0.7 m2/g). Fourier transform infrared (FT-IR) and thermogravimetric analysis (TGA) indicated that aliphatic, carboxylate and hydroxyl groups were chemically attached on the surface of ZnO nanoparticles. Long-term (80 days) dispersion test using ultraviolet transmittance showed that the surface-modified ZnO particles had enhanced dispersion stability in ethylene glycol. Crown",

keywords = "Nanoparticles, Supercritical methanol, Surface modification, Zinc oxide",

author = "Bambang Veriansyah and Kim, {Jae Duck} and Min, {Byoung Koun} and Shin, {Young Ho} and Lee, {Youn Woo} and Jaehoon Kim",

note = "Funding Information: This research was supported by Nano R&D program through the Korea Science and Engineering Foundation funded by the Ministry of Education, Science and Technology ( 2009-0083206 ). Partial support of the National Research Foundation of Korea Grant funded by the Korean Government (MEST) ( NRF-2009-C1AAA001-2009-0092935 ) is appreciated.",

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doi = "10.1016/j.supflu.2009.11.010",

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pages = "76--83",

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AU - Shin, Young Ho

AU - Lee, Youn Woo

AU - Kim, Jaehoon

N1 - Funding Information: This research was supported by Nano R&D program through the Korea Science and Engineering Foundation funded by the Ministry of Education, Science and Technology ( 2009-0083206 ). Partial support of the National Research Foundation of Korea Grant funded by the Korean Government (MEST) ( NRF-2009-C1AAA001-2009-0092935 ) is appreciated.

PY - 2010/2

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N2 - Continuous synthesis of surface-modified zinc oxide (ZnO) nanoparticles was examined using surface modifiers (oleic acid and decanoic acid) in supercritical methanol at 400 °C, 30 MPa and a residence time of ∼40 s. Wide angle X-ray diffraction (WAXD) analysis revealed that the surface-modified nanoparticles retained ZnO crystalline structure. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) showed that the surface modifiers changed drastically the size and morphology of the ZnO nanoparticles. When the molar ratio of oleic acid to Zn precursor ratio was 30, 10 nm size particles with low degree of aggregation were produced. The surface-modified ZnO nanoparticles had higher BET surface areas (29-36 m2/g) compared to unmodified ZnO particles synthesized in supercritical water (0.7 m2/g). Fourier transform infrared (FT-IR) and thermogravimetric analysis (TGA) indicated that aliphatic, carboxylate and hydroxyl groups were chemically attached on the surface of ZnO nanoparticles. Long-term (80 days) dispersion test using ultraviolet transmittance showed that the surface-modified ZnO particles had enhanced dispersion stability in ethylene glycol. Crown

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Continuous synthesis of surface-modified zinc oxide nanoparticles in supercritical methanol

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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