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利用多次还原法制备了不同粒径的金纳米颗粒,SEM和粒度分析表明其平均粒径分别为11nm,35nm和58nm.进一步通过表面活性剂辅助的液相转移法制备出不同粒径的油基金纳米流体,测试了金纳米流体在电场作用下的光学性质.结果表明金纳米流体在电场作用下表现出明显的双折射现象,且随电场强度的变化双折射具有可调节性.金颗粒粒径和浓度对折射率有明显影响,在实验采用的浓度范围内,折射率随金颗粒浓度和粒径的增加而减小.最后,利用电流变液结构转变机理对金纳米流体的电致双折射进行了分析.
The gold nanoparticles with different particle sizes were prepared by multiple reduction method and the average particle sizes were 11 nm, 35 nm and 58 nm respectively by SEM and particle size analysis.Furthermore, surfactant-assisted liquid phase transfer And the optical properties of gold nanofluids under electric field were tested.The results show that the gold nanofluids exhibits obvious birefringence under the action of electric field and the birefringence is adjustable with the change of electric field strength.The results show that gold nanoparticles The refractive index of the gold nanofluid decreases with the increase of gold particle concentration and particle size in the range of concentration used in the experiment.Finally, Refraction was analyzed.