access icon free Preparation of water-dispersible TiO2 nanoparticles

Water-dispersible TiO2 nanoparticles with narrow size distribution and good crystallinity were synthesised in a solvothermal process using lactic acid as the capping agent. X-ray diffraction, transmission electron microscopy and nitrogen adsorption–desorption isotherm were used to characterise the products. Meanwhile, the dispersion behaviour of the as-prepared TiO2 nanoparticles was investigated. The as-prepared powder can be easily redispersed in water to form a stable solution-like suspension with a concentration of 60 mg·ml−1. Moreover, the dispersion mechanism was also preliminarily discussed, suggesting that the excellent dispersibility of the as-prepared TiO2 nanoparticles is probably because of electrostatic repulsion from lactic acid molecules covalently linked to TiO2 nanoparticles.

Inspec keywords: nanoparticles; X-ray diffraction; transmission electron microscopy; adsorption; crystal growth from solution; suspensions; desorption; crystal structure; titanium compounds; nanofabrication; powders

Other keywords: TiO2; dispersibility; electrostatic repulsion; powder; dispersion behaviour; X-ray diffraction; nitrogen adsorption-desorption isotherm; transmission electron microscopy; solution-like suspension; capping agent; narrow size distribution; water-dispersible TiO2 nanoparticles; water redispersion; dispersion mechanism; crystallinity; solvothermal process; lactic acid molecules

Subjects: Crystal structure of specific inorganic compounds; Emulsions and suspensions; Adsorption and desorption kinetics; evaporation and condensation; Methods of nanofabrication and processing; Structure of solid clusters, nanoparticles, nanotubes and nanostructured materials; Crystal growth from solution; Sorption and accommodation coefficients (surface chemistry)

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http://iet.metastore.ingenta.com/content/journals/10.1049/mnl.2014.0305
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