不同颈状层结构无溶剂纳米流体的制备及性能研究

Synthesis and properties of different corona structure Fe_3O_4 solvent-free nanofluids

采用共沉淀法制备纳米Fe3O4和N-三甲氧基硅基丙基-N,N,N-三甲基氯化铵通过氢键结合成为颈状层,脂肪醇聚氧乙烯醚磺酸盐(C9H19)-(C6H4)-(OCH2CH2)20-O(CH2)3-SO3-K+作为反离子,通过静电作用成为纳米粒子的冠状层,制备成无溶剂纳米流体。采用XRD、TEM、FT-IR和TGA对无溶剂纳米流体结构进行表征,采用流变曲线研究不同颈状层结构的无溶剂纳米流体流变性能。结果表明,纳米粒子分散性好,颈状层和冠状层联接到纳米粒子表面,纳米粒子含量为10.42%。随着颈状层分子链变长,无溶剂纳米流体的损耗模量和粘度变小。

Fe3O4 solvent-free nanofluids were prepared,using with N-trimethoxysilylpropyl-N,N,N-trim-ethylammonium chloride as corona and anion C9H19-C6H4-（OCH2CH2）20O（CH2）3SO3-as canopy.Rheometer properties of different corona structure nanofluids were compared.The product was characterized by X-ray diffraction（XRD）,transmission electron microscopy（TEM）,Fourier transform infrared spectrum（FT-IR）,thermogravimetric analysis（TGA） and rheometer.As a result,Fe3O4 nanoparticles possessed good dispersion,and the content of Fe3O4 nanoparticals in the nanofluid proved to be about 10.42%.The loss shear modulus G″of the product was obviously higher than the storage shear modulus G′,this showed that the product which could flow at room temperature had obvious rheological behavior.For the solvent-free nanofluids,the long chain corona has the internal plasticization,which can decrease the loss modulus of system,while the short chain of corona will result in the high viscosity of nanofluids.Long alkyl chains of modifiers lead to lower viscosity and better flowability of nanofluids.