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Số người truy cập: 39,624,143

 Surface modification of TiO2 nanotubes by graftingwith APTS coupling agents
Tác giả hoặc Nhóm tác giả: Hong Phan Duong, Minh Duc Le, Hung Cuong Dao and Chia-Yun Chen
Nơi đăng: Materials Research Express; Số: 4 105043;Từ->đến trang: 1-8;Năm: 2017
Lĩnh vực: Khoa học công nghệ; Loại: Bài báo khoa học; Thể loại: Quốc tế
TÓM TẮT
Titanium dioxide nanotubes (TNTs) have been considered the promising nanostructuresemployed for many practical applications such as biomedical, photonic and optoelectronic devices.Nevertheless, strong aggregation of TNTs within various aqueous media significantly hinderedtheir practical utilizations and the capability of dispersing TNTs in the desired solvents are urgentto be improved. Therefore, in this study, the methodic investigations have been performed on thegrafted modification of 3-aminopropyl triethoxysilane (APTS) on the surfaces of synthesizedTNTs. A preliminary study was carried out to evaluate the influences of key parameters, includingthe concentrations of coupling agents, temperatures and the reaction durations, on the graftingefficiency of the aminosilane using Statistical design of experiments (DoE) methodology. TNTs withapproximately 10–20 nm in diameter were prepared with the controlled hydrothermal treatment ofcommercialized P25 particles. The obtained products were revealed by the modern physicochemicalsystems including x-ray diffraction (XRD), transmission electron microscopy (TEM) and Brunauer-Emmett-Teller (BET) analysis. The additions of silane agent, reaction temperature and time havebeen adjusted to reveal the influences of the grafting efficiency (from 2.5 to 7.8 wt %) by thermalgravimetric analysis (TGA). Analysis of Fourier transform infrared spectroscopy (FTIR) hasconfirmed the successful link of Ti–O–Si chemical bonds on the grafted TNTs.
ABSTRACT
Titanium dioxide nanotubes (TNTs) have been considered the promising nanostructuresemployed for many practical applications such as biomedical, photonic and optoelectronic devices.Nevertheless, strong aggregation of TNTs within various aqueous media significantly hinderedtheir practical utilizations and the capability of dispersing TNTs in the desired solvents are urgentto be improved. Therefore, in this study, the methodic investigations have been performed on thegrafted modification of 3-aminopropyl triethoxysilane (APTS) on the surfaces of synthesizedTNTs. A preliminary study was carried out to evaluate the influences of key parameters, includingthe concentrations of coupling agents, temperatures and the reaction durations, on the graftingefficiency of the aminosilane using Statistical design of experiments (DoE) methodology. TNTs withapproximately 10–20 nm in diameter were prepared with the controlled hydrothermal treatment ofcommercialized P25 particles. The obtained products were revealed by the modern physicochemicalsystems including x-ray diffraction (XRD), transmission electron microscopy (TEM) and Brunauer-Emmett-Teller (BET) analysis. The additions of silane agent, reaction temperature and time havebeen adjusted to reveal the influences of the grafting efficiency (from 2.5 to 7.8 wt %) by thermalgravimetric analysis (TGA). Analysis of Fourier transform infrared spectroscopy (FTIR) hasconfirmed the successful link of Ti–O–Si chemical bonds on the grafted TNTs.
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