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Electrochemical Discrimination of Phthalic Acid amo...
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Simple Synthesis of Water-Dispersible and Photoactive Titanium Dioxide Nanoparticles Using Functionalized Poly(ethylene oxide)s
| Journal | Macromolecular Research |
|---|---|
| Author | Seung-Hoon Bahng, Nan Hyun Kwon, Hyung Cheol Kim, Abu Bakkar Siddique, Ho-Jung Kang, Jae Yeol Lee, Joohoon Kim, Sehoon Kim, Jungahn Kim |
| Citation | 2014, 22(4), 445-456 |
| DOI | http://dx.doi.org/10.1007/s13233-014-2062-5 |
Versatile and direct synthesis of water-dispersible titanium dioxide (TiO2) nanoparticles in the presence of functionalized poly(ethylene oxide)s (PEO) having carboxylic acid groups is presented. The functionalized PEOs, such as PEO-folate conjugate and PEO-b-poly(maleic acid) (PEO-b-PMAc) as polymeric surfactants, were employed for in situ synthesis of TiO2 nanoparticles through hydrolytic sol-gel process of titanium tetrachloride as a precursor in eco-friendly alcoholic media at a relatively low temperature. Both of the two polymers were found to be very effective for stabilizing TiO2 nanocrystals, exhibiting not only fairly good photocatalytic activities but also water-dispersible property. The core TiO2 crystallites in the size range of 8∼11 nm could be readily controlled in ethanol at a relatively low reaction temperature (70 °C), irrespective of the incipient reaction condition, which showed mixed polymorphs. The TiO2 nanoparticles consist of a few percentages (<10%) of brookite and mostly anatase phases. This process provides a simple and useful in situpreparative route to obtain water-dispersible TiO2 nanoparticles.
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