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A new approach to the preparation of PEGylated [PEG: poly(ethylene glycol)] SiO2/Au hybrid nanoparticles was investigated. The synthesis of a PEGylated nanogel containing SiO2/Au hybrid nanoparticles was performed using matrix-catalyzed hydrolysis of tetraethyl orthosilicate, followed by the reduction of HAuCl4. UV–vis absorption of the prepared hybrid particles was obtained at 618 nm, which is a much longer wavelength than that of a nanogel containing only Au nanoparticles (523 nm). High-angle annular dark field images of the prepared particles observed using transmission electron microscopy and energy-dispersive X-ray spectroscopy confirmed the coexistence of Si and Au in the same particle. The presence of Si and Au in the prepared particles was also confirmed by inductively coupled plasma atomic emission spectroscopy. Dynamic light-scattering measurements of the particles in a highly ionic medium showed that they have high stability in both acidic and basic regions.

2013-03-14 08:32:23
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1 0 0 0 OA 高齢者の身体的虚弱化要因を検討するコホート研究

著者: 大藏倫博
巻号頁・発行日: 2012

科学研究費助成事業(科学研究費補助金)研究成果報告書:若手研究(B)2010-2011

2013-03-14 08:32:18
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http://hdl.handle.net/2241/118627

1 0 0 0 OA Adsorption mechanisms of high-levels of ammonium onto natural and NaCl-modified zeolites

著者: Lin Lin Lei Zhongfang Wang Li Liu Xiang Zhang Yi Wan Chunli Lee Duu-Jong Tay Joo Hwa
出版者: Elsevier B.V.
雑誌: Separation and purification technology (ISSN:13835866)
巻号頁・発行日: vol.103, pp.15-20, 2013-01
被引用文献数: 236 19

Zeolites, microporous aluminosilicate minerals, have high affinity to ammonium in water. This study explored the mechanisms of ammonium adsorption onto natural zeolite and NaCl-modified counterpart under different ammonium levels (10–4000 mg-N/L) and initial pH 3.4–11.1. Ion exchange dominated the ammonium adsorption process near neutral pH, with the order of exchange selectivity following Na+ > Ca2+ > K+ > Mg2+. At high ammonium levels, Ca2+ exceeded Na+ as the dominant ions for ammonium adsorption. Conversely, in strong alkaline solutions, molecular adsorption suppressed ion exchange in ammonium adsorption. NaCl modification effectively increased ammonium adsorption capacity by increasing the Na contents in zeolite and by modifying the surface morphology to enhance film mass transfer rate. The modified zeolite presents a potential adsorbent to reduce ammonium concentration in landfill leachates, livestock wastewaters or effluents from anaerobic digestion tanks of livestock manure.

2013-03-14 08:32:12
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1 0 0 0 OA 電子スピン共鳴による有機トランジスタのミクロ評価と電荷トラップ機構の解明

著者: 丸本一弘
巻号頁・発行日: 2012

2013-03-14 08:32:07
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http://hdl.handle.net/2241/118626

1 0 0 0 OA ロラン・バルトの中性概念における二項性と潜在性

著者: 金谷壮太
出版者: 筑波大学比較・理論文学会
雑誌: 文学研究論集 (ISSN:09158944)
巻号頁・発行日: no.31, pp.99-113, 2013-02-28

2013-03-14 08:32:01
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http://hdl.handle.net/2241/118637

1 0 0 0 OA 占領下の映画政策と溝口健二の「女性解放映画三部作」 : 『わが恋は燃えぬ』を中心に

著者: 金普慶
出版者: 筑波大学比較・理論文学会
雑誌: 文学研究論集 (ISSN:09158944)
巻号頁・発行日: no.31, pp.79-97, 2013-02-28

2013-03-14 08:31:56
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http://hdl.handle.net/2241/118636

1 0 0 0 OA 佐藤春夫と周氏兄弟の「相互翻訳」

著者: 李雪
出版者: 筑波大学比較・理論文学会
雑誌: 文学研究論集 (ISSN:09158944)
巻号頁・発行日: no.31, pp.57-78, 2013-02-28

2013-03-14 08:31:51
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http://hdl.handle.net/2241/118635

1 0 0 0 OA 芥川龍之介「母」試論 : 近代中国の都市表象を視座として

著者: 姚紅
出版者: 筑波大学比較・理論文学会
雑誌: 文学研究論集 (ISSN:09158944)
巻号頁・発行日: no.31, pp.35-55, 2013-02-28

2013-03-14 08:31:45
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http://hdl.handle.net/2241/118634

1 0 0 0 OA 被害者か、英雄か : 「唐人お吉」の旅、日本、ヨーロッパ、そして日本へ

著者: 齊藤愛
出版者: 筑波大学比較・理論文学会
雑誌: 文学研究論集 (ISSN:09158944)
巻号頁・発行日: no.31, pp.17-33, 2013-02-28

2013-03-14 08:31:39
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http://hdl.handle.net/2241/118633

1 0 0 0 OA A Facile Synthesis of 1,1-Difluoroallenes from Commercially Available 1,1,1-Trifluoro-2-iodoethane

著者: Oh Ken Fuchibe Kohei Ichikawa Junji
出版者: Georg Thieme Verlag
雑誌: Synthesis (ISSN:00397881)
巻号頁・発行日: vol.2011, no.6, pp.881-886, 2011-03
被引用文献数: 2 5

1,1-Difluoroallenes are synthesized in good yield via zinc-promoted 1,2-elimination of 3,3-difluoro-2-iodoallylic acetates, which are prepared by the reaction of aldehydes or ketones with 1-iodo-2,2-difluorovinyllithium, generated from commercially available 1,1,1-trifluoro-2-iodoethane.Key words