The Relationship between Gelation Behavior and the Amount of Polymer Dose per Silica Surface Area of “Shake-Gels” Consisting of Silica Nanoparticles and Poly(Ethylene Oxide)
The understanding and control of the rheological behaviors of colloids and polymer mixtures is an important issue for scientific interests and industrial applications. Aqueous mixed suspensions of silica nanoparticles and poly(ethylene oxide) (PEO) under certain conditions are interesting systems ca...
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| Format: | Article |
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MDPI AG
2023-04-01
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| Series: | Molecules |
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| Online Access: | https://www.mdpi.com/1420-3049/28/8/3555 |
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| author | Shunsuke Sato Motoyoshi Kobayashi |
| author_facet | Shunsuke Sato Motoyoshi Kobayashi |
| author_sort | Shunsuke Sato |
| collection | DOAJ |
| description | The understanding and control of the rheological behaviors of colloids and polymer mixtures is an important issue for scientific interests and industrial applications. Aqueous mixed suspensions of silica nanoparticles and poly(ethylene oxide) (PEO) under certain conditions are interesting systems called “shake-gels”, whose states vary reversibly between sol-like and gel-like under repeated shaking and being left to stand. Previous studies have indicated that the amount of PEO dose per silica surface area (<i>C</i><sub>p</sub>) is a crucial parameter for the formation of shake-gels and the relaxation time from gel-like to sol-like states. However, the relationship between the gelation dynamics and the <i>C</i><sub>p</sub> values has not been fully investigated. To determine how the gelation dynamics are affected by the <i>C</i><sub>p</sub>, we measured the time taken for silica and PEO mixtures to gelate from the sol-like to gel-like states as a function of the <i>C</i><sub>p</sub> under different shear rates and flow types. Our results show that the gelation time decreased with increasing shear rates and depended on the <i>C</i><sub>p</sub> values. Moreover, the minimum gelation time was found around a certain <i>C</i><sub>p</sub> (=0.03 mg/m<sup>2</sup>) for the first time. The finding suggests that there is an optimum <i>C</i><sub>p</sub> value at which the bridging of silica nanoparticles using PEO is significant, and thus, the shake-gels and stable gel-like states are most likely to form. |
| first_indexed | 2024-03-11T04:41:42Z |
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| id | doaj.art-9adffaf0c27d4dd7a54eb5d6aee15f01 |
| institution | Directory Open Access Journal |
| issn | 1420-3049 |
| language | English |
| last_indexed | 2024-03-11T04:41:42Z |
| publishDate | 2023-04-01 |
| publisher | MDPI AG |
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| series | Molecules |
| spelling | doaj.art-9adffaf0c27d4dd7a54eb5d6aee15f012023-11-17T20:40:41ZengMDPI AGMolecules1420-30492023-04-01288355510.3390/molecules28083555The Relationship between Gelation Behavior and the Amount of Polymer Dose per Silica Surface Area of “Shake-Gels” Consisting of Silica Nanoparticles and Poly(Ethylene Oxide)Shunsuke Sato0Motoyoshi Kobayashi1Graduate School of Science and Technology, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba 305-8572, JapanFaculty of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennoudai, Tsukuba 305-8572, JapanThe understanding and control of the rheological behaviors of colloids and polymer mixtures is an important issue for scientific interests and industrial applications. Aqueous mixed suspensions of silica nanoparticles and poly(ethylene oxide) (PEO) under certain conditions are interesting systems called “shake-gels”, whose states vary reversibly between sol-like and gel-like under repeated shaking and being left to stand. Previous studies have indicated that the amount of PEO dose per silica surface area (<i>C</i><sub>p</sub>) is a crucial parameter for the formation of shake-gels and the relaxation time from gel-like to sol-like states. However, the relationship between the gelation dynamics and the <i>C</i><sub>p</sub> values has not been fully investigated. To determine how the gelation dynamics are affected by the <i>C</i><sub>p</sub>, we measured the time taken for silica and PEO mixtures to gelate from the sol-like to gel-like states as a function of the <i>C</i><sub>p</sub> under different shear rates and flow types. Our results show that the gelation time decreased with increasing shear rates and depended on the <i>C</i><sub>p</sub> values. Moreover, the minimum gelation time was found around a certain <i>C</i><sub>p</sub> (=0.03 mg/m<sup>2</sup>) for the first time. The finding suggests that there is an optimum <i>C</i><sub>p</sub> value at which the bridging of silica nanoparticles using PEO is significant, and thus, the shake-gels and stable gel-like states are most likely to form.https://www.mdpi.com/1420-3049/28/8/3555shear-induced gelsrheologygelation timeflow typepoly(ethylene glycol) |
| spellingShingle | Shunsuke Sato Motoyoshi Kobayashi The Relationship between Gelation Behavior and the Amount of Polymer Dose per Silica Surface Area of “Shake-Gels” Consisting of Silica Nanoparticles and Poly(Ethylene Oxide) Molecules shear-induced gels rheology gelation time flow type poly(ethylene glycol) |
| title | The Relationship between Gelation Behavior and the Amount of Polymer Dose per Silica Surface Area of “Shake-Gels” Consisting of Silica Nanoparticles and Poly(Ethylene Oxide) |
| title_full | The Relationship between Gelation Behavior and the Amount of Polymer Dose per Silica Surface Area of “Shake-Gels” Consisting of Silica Nanoparticles and Poly(Ethylene Oxide) |
| title_fullStr | The Relationship between Gelation Behavior and the Amount of Polymer Dose per Silica Surface Area of “Shake-Gels” Consisting of Silica Nanoparticles and Poly(Ethylene Oxide) |
| title_full_unstemmed | The Relationship between Gelation Behavior and the Amount of Polymer Dose per Silica Surface Area of “Shake-Gels” Consisting of Silica Nanoparticles and Poly(Ethylene Oxide) |
| title_short | The Relationship between Gelation Behavior and the Amount of Polymer Dose per Silica Surface Area of “Shake-Gels” Consisting of Silica Nanoparticles and Poly(Ethylene Oxide) |
| title_sort | relationship between gelation behavior and the amount of polymer dose per silica surface area of shake gels consisting of silica nanoparticles and poly ethylene oxide |
| topic | shear-induced gels rheology gelation time flow type poly(ethylene glycol) |
| url | https://www.mdpi.com/1420-3049/28/8/3555 |
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