title: Polyoxometalate-lyotropic liquid crystal hybrid material formed in room-temperature ionic liquids.
abstract: Manganese(II)-substituted polyoxometalate, Na6(NH4)4[(Mn(II)(H2O)3)2(WO2)2(BiW9O33)2] x 37H2O (POM-Mn), was assembled within lyotropic hexagonal liquid crystal (LLC) formed in the room-temperature ionic liquids (RT-ILs), ethylammonium nitrate (EAN), fabricating the POM-LLC inorganic-organic hybrid materials. Polarized optical microscope images combined with small-angle X-ray scattering (SAXS) results indicate that the introduction of POM-Mn does not destroy the structure of hexagonal LLCs. The increase of d spacing demonstrates the integration of POM-Mn within the basic unit of the hexagonal LLCs. The FTIR spectra of the POM-LLC hybrid material show the characteristic absorption peaks of W-O bond. The rheological results indicate POM-LLC hybrid materials are highly viscoelastic and that the apparent viscosity is enhanced due to the introduction of the POM-Mn. The tribological properties were explored to greatly extend the applications of POM-LLC composites in RT-ILs as lubricating materials. The research of magnetic properties indicates the POM-LLC composite is ferromagnetic, therefore illuminating the potential application in the fields of magnetic materials.
authors: Key Laboratory of Colloid and Interface Chemistry, Shandong University, Ministry of Education, Jinan 250100, PR China.
authors: Wenqing
authors: W
authors: Jiang
authors: Liping
authors: L
authors: Liu
authors: Jingcheng
authors: J
authors: Hao
mesh_terms: D003460:Crystallization / Q000379:methods*; D017276:Friction; D052578:Ionic Liquids / Q000737:chemistry*; D050866:Liquid Crystals / Q000737:chemistry*; D008153:Lubrication; D008422:Materials Testing; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D010316:Particle Size; D013696:Temperature; D017973:Tungsten Compounds / Q000737:chemistry*; D000099294:Polyoxometalates
chemical_list: D052578:Ionic Liquids; D017973:Tungsten Compounds; C102296:polyoxometalate I; D000099294:Polyoxometalates