Viscoelastic properties of monodisperse spherical silica suspension
Viscoelastic properties of monodisperse spherical silica suspension
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DOI：
10.1007/s11771-007-0140-y
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发表时间：
2007-12
影响因子：
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通讯作者：
Wu Qiumei;Ruan Jian-ming;Huang Bai-yun;Z. Zhong-cheng;Zou Jian-peng
中科院分区：
文献类型：
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作者：
Wu Qiumei;Ruan Jian-ming;Huang Bai-yun;Z. Zhong-cheng;Zou Jian-peng
研究了四乙氧基硅烷在醇溶剂中以氨为催化剂水解制备的单分散球形二氧化硅悬浮液的粘弹性。结果表明：SiO2/PEG悬浮液具有可逆剪切减薄和剪切增稠的特性；在剪切减薄区，损耗模量（G″）基本保持不变，而储存模量（G′）则有所降低。在剪切增厚区，G″和G′增大，形成“团簇”。所研究的所有应力中g″overG '都较大，说明系统主要具有黏性，耗散的能量（Ed）大于存储的能量。在低剪应力下，该悬架的edf与最大应变（γmax）成正比，以1.92的指数上升；而在剪切增厚区，edx与γ的最大值成正比，指数为5.00。
The viscoelastic properties of the suspension of monodisperse spherical silica produced by hydrolysis of tetraethoxysilane in alcohol solvent with ammonia as a catalyst in polyethylene glycol (PEG) were studied. The results show that the SiO2/PEG suspension possesses the reversible shear thinning and shear thickening behaviors. In the shear thinning region, the loss modulus (G″) almost remains unchanged, whereas the storage modulus (G′) decreases. In the shear thickening region,G″ andG′ increase for the formation of the “clusters”. The largerG″ overG′ in all the stress studied shows that the system mainly possesses the viscous property, and that the energy dissipated(Ed) is larger than that stored.Edof this suspension is proportional to the maximum strain (γmax) rising with the exponent of 1.92 under low shear stress; however, in the shear thickening region,Edis proportional toγmaxrising with the exponent of 5.00.