<i>In situ</i> small-angle neutron scattering and rheological measurements of shear-induced gelation
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- Mitsuhiro Shibayama
- The University of Tokyo Institute for Solid State Physics, , Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
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- Hiromitsu Kawada
- Beauty Care Research Laboratories , Kao Co., Ltd., 2-1-3 Bunka, Sumida-ku, Tokyo 131-8501, Japan
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- Takuji Kume
- Beauty Care Research Laboratories , Kao Co., Ltd., 2-1-3 Bunka, Sumida-ku, Tokyo 131-8501, Japan
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- Takuro Matsunaga
- The University of Tokyo Institute for Solid State Physics, , Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
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- Hidetaka Iwai
- Beauty Care Research Laboratories , Kao Co., Ltd., 2-1-3 Bunka, Sumida-ku, Tokyo 131-8501, Japan
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- Tomohiko Sano
- Beauty Care Research Laboratories , Kao Co., Ltd., 2-1-3 Bunka, Sumida-ku, Tokyo 131-8501, Japan
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- Noboru Osaka
- The University of Tokyo Institute for Solid State Physics, , Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
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- Sho Miyazaki
- The University of Tokyo Institute for Solid State Physics, , Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
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- Satoshi Okabe
- The University of Tokyo Institute for Solid State Physics, , Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
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- Hitoshi Endo
- The University of Tokyo Institute for Solid State Physics, , Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
抄録
<jats:p>The microscopic structure of shear-induced gels for a mixed solution of 2-hydroxyethyl cellulose and nanometer-size spherical droplets has been investigated by in situ small-angle neutron scattering (SANS) with a Couette geometry as a function of shear rate γ̇. With increasing γ̇, the viscosity increased rapidly at γ̇≃4.0s−1, followed by a shear thinning. After cessation of shear, the system exhibited an extraordinarily large steady viscosity. This phenomenon was observed as a shear-induced sol-gel transition. Real-time SANS measurements showed an increase in the scattering intensity exclusively at low scattering angle region. However, neither orientation of polymer chains nor droplet deformation was detected and the SANS patterns remained isotropic irrespective of γ̇. It took about a few days for the gel to recover its original sol state. A possible mechanism of gelation is proposed from the viewpoint of shear-induced percolation transition.</jats:p>
収録刊行物
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- The Journal of Chemical Physics
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The Journal of Chemical Physics 127 (14), 144507-, 2007-10-09
AIP Publishing