采用水热合成法制备TiO2纳米管(TiNTs)和纳米片(TiNSs),以不同浓度比将两种纳米颗粒分散在水中形成水基混合纳米流体,研究了纳米流体总浓度和两种纳米颗粒浓度比对混合纳米流体稳定性的影响.通过纳米颗粒沉降高度随时间的变化计算了纳米颗粒的相对沉降速率,并用沉降速率评价了纳米流体的稳定性.结果显示,纳米流体总浓度越大,纳米颗粒沉降速率越小,纳米流体越稳定;总浓度相同时,在TiNTs浓度高的情况下,混合纳米流体的稳定性较好且优于单组份TiNTs和TiNSs纳米流体,但在TiNSs浓度高的情况下,混合纳米流体的稳定性较差.测试了不同剪切速率下纳米流体的粘度;从粘度变化的角度解释了纳米流体总浓度与TiNTs和TiNSs浓度比影响纳米颗粒沉降速率的原因.
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