Development of magnetic fluids using fluorocarbon oils

1. 制备了一些四（氟烷基）钛酸盐和四（氟烷基）硅酸盐，以获得含氟取代烷基的金属醇盐的基本信息。由于许多具有氟碳链的化合物具有拒水性能，因此人们期望这些烷氧化物具有稳定的防潮性能，但得到的产物对湿气很敏感，分解后生成金属氧化物和醇。制备了三种具有碳氟链的钛酸盐（c_4h_90）Ti[OCO(CF_2CF_2)nH]_3 （n=2或3）和（c_4h_90）Ti(OCOC_8F_<17 bbb_3)_3和三种硅酸盐（CH_3O）_2Si- [OCO(CF_2CF_2)_nH]_2 （n= 2,3或4）和（CH_3O）_2Si(OCOC_8F_<17>)_2。3 .制备了在一个分子中具有两个碳氟化合物链的阴离子表面活性剂[C_8F_<17>OCOCH_2CH(SO_3Na)COOC_8F_<17>]。合成了结构为（C_<10>F_<21>CH_2CH_2）（CH_3）Si(OCH_3)_2的偶联剂。Si-C键对水解非常稳定。利用所得产物对磁铁矿颗粒表面的改性能力进行了研究。3种丙烯酸钛和阴离子表面活性剂均具有表面处理能力，但处理后的磁铁矿颗粒不分散到氟碳油中。硅烷偶联剂(C_<10>F_<21>CH_2CH_2)- (CH_3)Si(OCH_3)_2处理后的磁铁矿颗粒分散成C_<10>F_<21>CH=CH_2结构的烯烃，分散状态表现为磁流体性质。

1. Some of the tetrakis(fluoroalkyl) titanates and tetrakis(fluoroalkyl) silicates were prepared to obtain a basic information of the metal alkoxide including fluoro-substituted alkyl groups. These alkoxides were expected to be stable against moisture, because many compounds having the fluorocarbon chain possess the property of water repellency, but the products obtained were sensitive to moisture and decomposed to give metal oxide and alcohol.2. Three titanium acylates having fluorocarbon chains, (C_4H_9O)Ti[OCO(CF_2CF_2)nH]_3 (n = 2 or 3) and (C_4H_9O)Ti(OCOC_8F_<17>)_3, and three silicon acylates, (CH_3O)_2Si- [OCO(CF_2CF_2)_nH]_2 (n=2, 3 or 4) and (CH_3O)_2Si(OCOC_8F_<17>)_2 were prepared.3. The anionic surfactant having two fluorocarbon chains in one molecule [C_8F_<17>OCOCH_2CH(SO_3Na)COOC_8F_<17>] was prepared.4. The coupling agent which structured by (C_<10>F_<21>CH_2CH_2)(CH_3)Si(OCH_3)_2 was synthesized. The Si-C bonding is very stable against hydrolysis.5. The modification ability for the surface of magnetite particles was examined using these products obtained.6. Three titanium acylates and the anionic surfactant had the ability of surface treatment, but the treated magnetite particles did not disperse into fluorocarbon oils.7. The magnetite particles treated with silane coupling agent, (C_<10>F_<21>CH_2CH_2)- (CH_3)Si(OCH_3)_2, were well dispersed into an olefin structured by C_<10>F_<21>CH=CH_2, and the dispersion state showed the property of magnetic fluids.