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Direct Observation of Relaxation of Aqueous Shake-Gel Consisting of Silica Nanoparticles and Polyethylene Oxide
http://hdl.handle.net/2241/00160035
bc4d0411-2d4b-458b-acbc-57d90ac94e38
名前 / ファイル | ライセンス | Actions | |
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item type | Journal Article(1) | |||||||||||
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公開日 | 2020-05-18 | |||||||||||
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言語 | en | |||||||||||
タイトル | Direct Observation of Relaxation of Aqueous Shake-Gel Consisting of Silica Nanoparticles and Polyethylene Oxide | |||||||||||
言語 | ||||||||||||
言語 | eng | |||||||||||
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タイプ | journal article | |||||||||||
著者 |
小林, 幹佳
× 小林, 幹佳
WEKO
106753
× Huang, Yi |
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抄録 | ||||||||||||
内容記述 | Controlling the rheological property of suspensions consisting of colloidal particles and polymers is necessary in industry. Especially, gels induced by shear (shake-gel) are interesting phenomena in rheological field. To gain insight into the shake-gel phenomena of the aqueous suspensions of silica nanoparticles and poly(ethylene oxide) (PEO) and its temporal change, we observed the state transition and measured the viscosity of the silica-PEO suspensions. Our results showed that PEO dose, pH, and molecular weight of PEO influence the state of suspension greatly, and revealed the differences of the suspension states, namely, cloudy, permanent gel, shake-gel, and high viscosity sol. We found that the relaxation time from shake-gel to flowable sol increases to the maximum and decreases again with increasing PEO dose. Shake-gels at pH 8.4 relaxed more slowly than at pH 9.4, and shake-gel did not form at pH above 10 in most of cases, indicating high pH inhibits the formation of shake-gels. PEO of molecular weight of 1000 and 4000 kDa easily bonds more silica nanoparticles by bridging and results in the formation of gels with more stable polymer networks. PEO of molecular weight of 1000 and 4000 kDa also led to longer relaxation time of the silica-PEO suspensions from gel to sol. | |||||||||||
書誌情報 |
en : Polymers 巻 12, 号 5, p. 1141, 発行日 2020-05 |
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ISSN | ||||||||||||
収録物識別子 | 2073-4360 | |||||||||||
DOI | ||||||||||||
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関連識別子 | 10.3390/polym12051141 | |||||||||||
権利 | ||||||||||||
権利情報 | © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). | |||||||||||
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値 | publisher | |||||||||||
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出版者 | MDPI |