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11.
In this study, the barite nanoparticles were successfully modified with stearate and the influence of stearate addition on
the performance of barite nanoparticles was systematically investigated. The products were characterized by activating factor
analysis, contact angle test, surface energy calculation, sedimentation rate calculation, rheological measurement, and FT-IR
analysis, etc. As the quantity of added stearate increased, both the activating factor and contact angle of barite nanoparticles increased
first then decreased. When the stearate content was 5% of the mass of barite nanoparticles, the activating factor and water
contact angle of modified particles reached maximum value, 97% and 126° respectively. At this time, the sedimentation rate
reached minimum, and so did the surface energy. The rheological test reveals that the viscosity of modified barite nanoparticles/petronol
system decreases greatly, indicating the surface performance of barite nanoparticles has changed from hydrophilicity to lipophilicity
after modification. C=O and COO stretching vibration peaks were found in the FT-IR spectra, which proves that the stearate
has combined onto the surface of barite nanoparticles. Finally, according to the zeta potential result of unmodified barite,
the possible modification mechanism was provided.
Project supported by the International Corporation Project (Grant No.07SU07001), and the Science Foundation of Science and
Technology Commission of Shanghai Municipality (Grant No.0552nm011) 相似文献
12.
A novel nano-TiO2-xNx composite was used as photocatalyst and added to the interior wall paint. The average diameter of nano-TiO2-xNx was about 20 nm. The majority crystal component of the sample was anatase and its optical absorption edge was shifted from 387 nm to 520 nm significantly. Nano-composite paint containing different dosage of nano- TiO2-xNx was investigated to study the properties of formaldehyde decomposition in the air. Testing results show that the formaldehyde decomposition ratio of that nano-paint can almost reach above 80%, especially for that of the paint containing 3% (w/w) nano-TiO2-xNx which exceeded 90%. The primary investigation on the reaction kinetics of photocatalytic formaldehyde decomposition indicated that the experiment data well fit the model of first-order reaction kinetics. 相似文献