Nano titanium oxide organosol: Synthesis, characterization, and application for electrorheological fluid

Abstract

A liquid-liquid phase transfer method was employed to prepare novel nano titanium oxide/silicone oil organosol. First, titanium oxide nanoparticles were synthesized in aqueous phase and then modified with several surfactants. It is found that only sodium dodecyl benzene sulfonate (SDBS) and sodium dodecyl sulphate (SDS) can cap nanoparticles and then nanoparticles could be transferred into organic phase by the phase transfer method. The transfer process was certified by the rapid change of color for the aqueous and organic phase. Other surfactants including hexadecyltrimethyl ammonium bromide (CTAB) and oleic acid were unable to ensure the phase transfer in the organic phase. The procedure was also verified by high-resolution transmission electron microscopy (HRTEM), particle size analyzer, UV-vis, etc. The results also showed the narrow size distribution of the nanoparticles. The mechanism of phase transfer is also discussed for different surfactant. Because of its good antisedimentation and high electrorheological effect, organosol is a novel path for the design and application of electrorheological fluid.

Simultaneous Phase Transfer and Surface Modification of TiO2 Nanoparticles Using Alkylphosphonic Acids: Optimization and Structure of the Organosols

“…16 Zhao et al also used SDBS and sodium dodecyl sulfate (SDS) to transfer TiO 2 NPs from an aqueous phase to a petroleum ether/silicone oil organic phase. 17 In these examples, the transfer mostly results from ionic interactions with the surface, not from the formation of strong, covalent bonds. Among the different types of molecules classically used to modify metal oxide surfaces, 18 alkylphosphonic acids (PAs) appear ideally suited for phase transfer of oxide particles.…”

Electrorheologically intelligent polyaniline and its composites

“…Most ER fluids were initially made of oxides or non-oxide inorganic particulates dispersed in an insulating non-polar liquid. [53][54][55][56][57][58][59] Although these inorganic particulate based ER fluids exhibits superior ER effects, the dispersion stability was very poor due to the high mismatch in density between the dispersed phase and medium oil. So, the focus has been turned to organic materials, and conducting polymers which possess conjugated π 60-62 bonds have been gradually adopted as ER materials because this type of materials possesses the capability of being polarized under an electric field, thus indicating high dielectric constant.…”

Fabrication of electric-stimuli responsive polyaniline/laponite composite and its viscoelastic and dielectric characteristics

“…In addition, robotic elements in biomedical applications have been evaluated [8]. Hence, research on the development of novel ER materials has increased tremendously [9][10][11][12][13][14].…”