TY - JOUR
T1 - Preparation and characterization of solvent-free Fe 3O 4 nanofluids
AU - Tan, Yu Mo
AU - Zheng, Ya Ping
AU - Lan, Lan
PY - 2012/1
Y1 - 2012/1
N2 - The surfactant was used to functionalize the nanoparticles to prepare solvent-free nanofluids. To prevent Fe 3O 4 nanoparticles from agglomerating and improve the dispersion of Fe 3O 4 nanoparticles, the solvent-free Fe 3O 4 nanofluids were synthesized through surface modification. Magnetic Fe 3O 4 nanoparticles were firstly prepared by chemical co-precipitation method. Then graft the quaternary ammonium salt (CH 3O) 3Si(CH 2) 3 N + (CH 3) 2(C 18H 37) Cl -, which has silanol groups, on Fe 3O 4 nanoparticles with hydroxyl groups. Finally, the chloridion was replaced with the anion C 9H 19-C 6H 4 (OCH 2CH 2) 20O (CH 2) 3 SO 3 through an ion-exchang process. An organic layer was formed on the surface of Fe 3O 4 nanoparticles, and made the Fe 3O 4 nanoparticles from black powder to brown fluid(at room temperature). The solvent-free Fe 3O 4 [KG*3]nanofluids were characterized by X-ray diffraction, Fourier transform infrared spectrum, differential scanning calorimetry, thermogravimetric analysis, transmission electron microscopy and rheometer. The Fe 3O 4 nanoparticles were monodispersed in solvent-free nanofluids, and the content of Fe 3O 4 nanoparticles in the nanofluids proved to be about 12%. The loss shear modulus G″ was higher than the storage shear modulus G'.
AB - The surfactant was used to functionalize the nanoparticles to prepare solvent-free nanofluids. To prevent Fe 3O 4 nanoparticles from agglomerating and improve the dispersion of Fe 3O 4 nanoparticles, the solvent-free Fe 3O 4 nanofluids were synthesized through surface modification. Magnetic Fe 3O 4 nanoparticles were firstly prepared by chemical co-precipitation method. Then graft the quaternary ammonium salt (CH 3O) 3Si(CH 2) 3 N + (CH 3) 2(C 18H 37) Cl -, which has silanol groups, on Fe 3O 4 nanoparticles with hydroxyl groups. Finally, the chloridion was replaced with the anion C 9H 19-C 6H 4 (OCH 2CH 2) 20O (CH 2) 3 SO 3 through an ion-exchang process. An organic layer was formed on the surface of Fe 3O 4 nanoparticles, and made the Fe 3O 4 nanoparticles from black powder to brown fluid(at room temperature). The solvent-free Fe 3O 4 [KG*3]nanofluids were characterized by X-ray diffraction, Fourier transform infrared spectrum, differential scanning calorimetry, thermogravimetric analysis, transmission electron microscopy and rheometer. The Fe 3O 4 nanoparticles were monodispersed in solvent-free nanofluids, and the content of Fe 3O 4 nanoparticles in the nanofluids proved to be about 12%. The loss shear modulus G″ was higher than the storage shear modulus G'.
KW - Fe O nanoparticles
KW - Solvent-free nanofluid
KW - Surface modification
UR - http://www.scopus.com/inward/record.url?scp=84863066064&partnerID=8YFLogxK
U2 - 10.3969/j.issn.0251-0790.2012.01.035
DO - 10.3969/j.issn.0251-0790.2012.01.035
M3 - 文章
AN - SCOPUS:84863066064
SN - 0251-0790
VL - 33
SP - 206
EP - 209
JO - Gaodeng Xuexiao Huaxue Xuebao/Chemical Journal of Chinese Universities
JF - Gaodeng Xuexiao Huaxue Xuebao/Chemical Journal of Chinese Universities
IS - 1
ER -