Nanoparticles, conductive titanium dioxide

In the first class of CPs nanocomposites, the oxides considered as secondary component are titanium dioxide (TiO ), zirconium dioxide (ZrOj), silicon dioxide (SiO ), aluminium oxide (Al O ), cadmium oxide (CdO) and zinc oxide (ZnO) [19, 27, 31, 48-52]. Titanium dioxide nanoparticles have excellent properties such as charge carrier, oxidising power, non-toxicity, chemical and photo stability. Conductive PANI/TiO nanocomposites combine the qualities of PANI and nanocrystalline TiO within a single material, thereby developing multifunctional materials with combined properties which have very strong potential applications. 

Another new field related to the use of cellulose for high value-added materials concerns the incorporation of inorganic nanoparticles into a cellulose fibre assembly. Three interesting studies are mentioned hwe in this context, viz. (i) the growth of cadmium sulphide (CdS) semi-conducting nanocrystals on the surface of regenerated cellulose fibres [89] and the study of the photoluminescence of the ensuing composite (ii) the precipitation of titanium dioxide... 

More recently nanoscale fillers such as clay platelets, silica, nano-calcium carbonate, titanium dioxide, and carbon nanotube nanoparticles have been used extensively to achieve reinforcement, improve barrier properties, flame retardancy and thermal stability, as well as synthesize electrically conductive composites. In contrast to micron-size fillers, the desired effects can be usually achieved through addihon of very small amounts (a few weight percent) of nanofillers [4]. For example, it has been reported that the addition of 5 wt% of nanoclays to a thermoplastic matrix provides the same degree of reinforcement as 20 wt% of talc [5]. The dispersion and/or exfoliahon of nanofillers have been identified as a critical factor in order to reach optimum performance. Techniques such as filler modification and matrix functionalization have been employed to facilitate the breakup of filler agglomerates and to improve their interactions with the polymeric matrix. 

This research note focuses on process characteristics of pol5nner solutions, such as viscosity and electrical conductivity, as well as the parameters of electrospinning using poly-3-hydroxybutyrate modified by titanium dioxide nanoparticles, which have been optimized. The structure of materials has been examined by means of X-ray diffraction, differential scanning calorimetry, IR-spectroscopy, and physical-mechanical testing. 

When titanium dioxide nanoparticles and nanocrystallines are irradiated with UV-visible light, this semiconductor can exhibit strong bactericidal activity. For instance, Chang et al. showed that the irradiation of suspensions of Escherichia coli and Ti02 (P-25) with of wavelengths longer than 380 nm led to bactericidal action within minutes [26]. Furthermore, the trends in these simulated laboratory experiments were mimicked in outdoor tests conducted under the summer, noonday sun [27]. Elsewhere, Maness et al. presented the first evidence that Hpid peroxida-... 

Dhawan SK, Singh K, Bakhshi AK, Ohlan A (2009) Conducting polymtn embedded with nanoferrite and titanium dioxide nanoparticles for microwave absorption. Synth Met... 

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