Sedimentation Pattern of Polymer Colloidal Dispersions in the External Fields
| Project/Area Number |
18350057
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Polymer chemistry
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| Research Institution | Yamagata University |
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Principal Investigator |
OKUBO Tsuneo Yamagata University, Graduate School of Sci and Tech, Guest Professor (70026194)
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| Co-Investigator(Kenkyū-buntansha) |
MIYATA Ken Yamagata University, Graduate School of Sci and Tech, Assistant Professor (60333994)
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| Project Period (FY) |
2006 – 2007
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| Project Status |
Completed (Fiscal Year 2007)
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| Budget Amount *help |
¥14,580,000 (Direct Cost: ¥13,500,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2007: ¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2006: ¥9,900,000 (Direct Cost: ¥9,900,000)
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| Keywords | Sedimentation dissipative pattern / Convectional dissipative pattern / Drvine dissinative pattern / Gravitational convection / Maraneoni convection / Colloidal silica spheres / PMMA spheres / 外場応答性 / 電場応答性 / コロイダルシリカ粒子 |
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| Research Abstract |
In this project, the convectional, sedimentation and drying dissipative patterns during the course of drying polymer colloidal dispersions and others were studied intensively Main results obtained are summarized as following:
(1) The broad ring-like sedimentation patterns were formed on a cover glass, a watch glass and a glass dish, which demonstrates the important role of the convectional flow of water and colloidal spheres. The sedimentary spheres changed their semi-equilibrium position floating over the substrates by the balancing between the outside and/or upward convectional flow and inner ward and/or downward sedimentation.
(2) Macroscopic (broad rings and spoke-like lines) and microscopic (fine multiple spoke lines, sting-like, star-like patterns, etc) drying patterns formed.
(3) Convectional patterns of Chinese black ink and aqueous suspensions of poly (methyl methacrylate), PMMA spheres have been studied in detail at the elevated and the room temperatures, respectively. Broad ring, spoke line ("Terada cells") and the circulating cell structures were observed, for the first time, on the substrates.
(4) Patterns in a flow field and theoretical discussion including computational simulation on the convectional, sedimentation and drying dissipative patterns are still open for further study.
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Report
(3 results)
Research Products
(200 results)
