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논문 기본 정보

자료유형
학술저널
저자정보
Ozel, Burcu Genc (Faculty of Engineering and Natural Sciences, Advanced Composites and Polymer Processing Laboratory [AC2PL], Sabanci University) Orum, Aslihan (Faculty of Engineering and Natural Sciences, Advanced Composites and Polymer Processing Laboratory [AC2PL], Sabanci University) Yildiz, Mehmet (Faculty of Engineering and Natural Sciences, Advanced Composites and Polymer Processing Laboratory [AC2PL], Sabanci University) Menceloglu, Yusuf Z. (Faculty of Engineering and Natural Sciences, Advanced Composites and Polymer Processing Laboratory [AC2PL], Sabanci University)
저널정보
한국유변학회 Korea-Australia rheology journal Korea-Australia rheology journal 제26권 제1호
발행연도
2014.1
수록면
105 - 116 (12page)

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In this work, we have investigated rheological behavior of colloids with a low particle volume fraction, and anisotropic and flocculated microstructures through measuring their viscosity and electrical resistance under varying shear rates together with utilizing several relevant characterization methods (i.e., Dynamic Light Scattering, Transmission Electron Microscopy, Atomic Force Microscopy, and Capacitance and Electrical resistance measurements). The colloids are formed through the suspension of hydrophilic/phobic fumed silica particle with attractive/repulsive interaction in polyethylene glycol and/or ethylene oxide-propylene oxide copolymer. It is observed that studied suspensions display shear thickening/thinning flow behavior depending on their microstructure (the spatial distribution and arrangements of particles in continuous media) and associated changes in cluster sizes, which are controlled by the break down of densified clusters (due to the shear induced mechanical and hydrodynamical forces) and the interaction forces among particle-particle and particles-polymers (owing to physicochemical effects). The detailed evaluation of the experimental results indicates that the shear thickening phenomena in low volume fraction, anisotropic and flocculated systems can be mainly attributed to the increase in the effective volume fraction of particles due to both hydrodynamic and physicochemical forces.

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