Lyotropic liquid-crystalline phase of oligo(ethylene oxide) surfactant/transition metal salt and the synthesis of mesostructured cadmium sulfide

dc.contributor.authorDag, Ö.en_US
dc.contributor.authorAlayoǧlu, S.en_US
dc.contributor.authorTura, C.en_US
dc.contributor.authorÇelik, Ö.en_US
dc.departmentDepartment of Chemistryen_US
dc.description.abstractLyotropic liquid-crystalline (LLC), transition metal salt: oligo(ethylene oxide) nonionic surfactant (CnH2n+1(CH2CH2O)mOH, denoted as CnEOm), systems have been studied by means of diffraction, microscopy, and spectroscopy to elucidate the structural, thermal, and templating properties. In the system, the lyotropic salts of transition metal aqua complexes, such as chlorides and sulfates, are insoluble and do not form a LC phase in CnEOm-type nonionic surfactants. However, the transition metal aqua complexes of nitrates and perchlorates are soluble and form 2D and 3D hexagonal and cubic mesophases. These phases are stable in a very broad range of salt:surfactant mole ratios (1.0 and 3.6). The nitrate salts form a hexagonal mesophase. However, in high nitrate salt concentrations (above 3.2 salt:surfactant mole ratio), the salt crystals are either insoluble or the salt:surfactant mixtures are in a cubic mesophase. The structure and thermal properties of the new system are determined by the solubility of the transition metal salts, the concentration of the salt, and the surfactant type. The LC [Cd(H2O)4](NO3)2: C12EO10 mesophase has been reacted with H2S gas to produce solid mesostructured CdS (meso-CdS). The meso-CdS particles are spherical in morphology and are made up of hierarchical organization of 2-4-nm CdS particles. The salt:surfactant LLC systems and the solid meso-CdS have been investigated using polarized optical microscopy, X-ray diffraction, Fourier transform infrared, Fourier transform Raman, and UV-vis absorption spectroscopy, scanning electron microscopy, and transmission electron microscopy.en_US
dc.publisherAmerican Chemical Societyen_US
dc.source.titleChemistry of Materialsen_US
dc.subjectTransition metal saltsen_US
dc.subjectFourier transform infrared spectroscopyen_US
dc.subjectOptical microscopyen_US
dc.subjectSurface active agentsen_US
dc.subjectTransition metalsen_US
dc.subjectUltraviolet spectroscopyen_US
dc.subjectX ray diffraction analysisen_US
dc.subjectLiquid crystalsen_US
dc.titleLyotropic liquid-crystalline phase of oligo(ethylene oxide) surfactant/transition metal salt and the synthesis of mesostructured cadmium sulfideen_US
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