本文研究了以聚乙二醇(PEG400)为分散介质的低固相体积分数(V<10 vol%)纳米SiO2分散体系的稳态和动态的流变性能.在稳态应力实验中,当剪切速率较小时,体系具有剪切变稀现象,而剪切速率(γ·)大于临界剪切速率(γ·c)时,随剪切速率的增大,体系呈现先剪切增稠再剪切变稀的复杂变化.在动态应力实验中,体系的复合粘度随测试频率的增大而减小,并呈现剪切增稠特性.进一步研究了分散体系的pH值和固相体积分数对流变性能的影响.在酸性条件下,体系粘度较小,呈现剪切增稠现象;在中性和碱性条件下,体系粘度增大,并在高剪切应力下剪切变稀.体系的粘度随固相体积含量的增大而上升,并且由牛顿流体转变为具有剪切增稠性质的非牛顿流体.
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