Titanium Dioxide Nanopowder, P25 Grade

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Catalog Number
NM-ONMs029
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100 g
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$299
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Catalog Number
NM-ONMs029
Size
500 g
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$699
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Catalog Number

NM-ONMs029

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Titanium Dioxide Nanopowder, P25 Grade

The effect of Titanium Dioxide Nanopowder on the micro -structure of tin lead solder

A schematic of the test set-up for preparing samples. Lin, D. C., et al. Materials Letters 57.21 (2003): 3193-3198.

Add the micro -structure and hardness of the composite welded obtained by the Titanium Dioxide Nanopowder in the traditional solder. By fully mixing the Titanium Dioxide Nanopowder and common crystal welded powder to fully combine the use of water-soluble welding to prepare titanium dioxide nanowe powder to enhance the lead (PB) -s (SN) composite welded. Moisture the mixed welded balm and solidify it in the cricket where the hot plate and keep the constant temperature. Observation of optical microscope shows that when titanium dioxide adds 1 WT.%, The grain size and crystal boundary width decreased. When 2 WT.% titanium dioxide is added, nano powder microphone is observed in the crystal boundary and along the crystal boundary area, and there is a second phase particles at the same time. Micro -hardness measurement shows that the addition of titanium nano powder can help improve the overall strength of common crystal welds.
The quantity of precision weighing SN-PB solder powder and different proportion of Titanium Dioxide Nanopowder. Before adding a water -soluble melting agent to the mixture, the two powders are fully mixed. Stir the income composite mixture for 30 minutes to ensure that the nanow powder is evenly distributed in the composite substrate. Preheat the hot plate to 250 ° C under the gas environment. (2) Use the handle and rod component to push the sample frame into the required position, so that the aluminum plate and the hot plate are directly contacting. (3) Keep the shelf on the hot plate for a few minutes so that there is enough time to heat the composite mixture to the melting point. Take out the curing composite material samples and clean it by immersion in the hydrochloride solution to remove welded, surface oxides and pollutants. Sample was then dried in the temperature environment in the room temperature in isopropanol.

Photocatalytic decolorization of dyes by titanium dioxide nanopowders

Decolorisation efficiency profile for CI Reactive Black 5.Experimental conditions: 125 W UV light, CI Reactive Black 5 concentration = 10 mg ⁄ l and titanium dioxide loading = 5 g ⁄ l. Low, Fiona Chai Foong, et al. Coloration Technology 128.1 (2012): 44-50.

The photocatalytic decolorization of CI Reactive Black 5 using titanium dioxide nanopowder as catalyst was investigated and the results obtained were discussed in terms of decolorization efficiency. All experiments were conducted using a double-walled quartz immersed batch reactor with a natural pH of 5.1 in the form of a slurry of reactants. It was found that the photocatalytic decolorization efficiency obtained using titanium dioxide nanopowders was higher than that of the reference titanium dioxide powder, which required about 8 min to achieve almost complete decolorization of 10 mg ⁄ l CI Reactive Black 5. The rates of CI Reactive Black 5 using titanium dioxide photocatalyst generally followed a first-order reaction and the decolorization kinetics were successfully fitted to a simplified Langmuir-Hinshelwood kinetic model. Furthermore, the effects of light type and intensity, catalyst loading, and initial CI Reactive Black 5 concentration were investigated using titanium dioxide nanopowders as photocatalysts for dye decolorization. This study showed that the recommended parameters for treating 10 mg ⁄ l CI Reactive Black 5 are 125 W (39.3 mW ⁄ cm) of UV power and 0.3 g ⁄ l catalyst loading, based on the experimental setup and operating conditions.
The irradiation experiments were conducted in a large quartz immersion reactor provided by SAIC. The double-walled quartz immersion well was equipped with a mercury lamp that could be replaced based on the experimental requirements. Lamps rated at 16, 70, 125, and 400 W UV and 400 W visible (vis) were used in this study. The 16 W UV lamp emitted primarily UV light at a wavelength of 254 nm, while the 70, 125, and 400 W UV lamps emitted primarily light at a wavelength of 340 nm. The 400 W visible lamp emitted visible light at wavelengths above 380 nm.
As a control, photolysis experiments were performed using TiO2 nanopowder and reference TiO2 powder to determine the decolorization efficiency of 10 mg/l CI Reactive Black 5. All experiments were performed at ambient temperature (23 ± 1 °C) without adjusting the pH of the CI Reactive Black 5 solution (pH 5.1). All experiments were performed in triplicate to demonstrate the reproducibility of the results.

Effect of Titanium Dioxide Nanopowders and Coatings on Planktonic Pseudomonas aeruginosa

Degradation of rhoB in demineralized water solution caused by 3 g/L photoactivated TiO2 and in the control tests. Each value corresponds to the mean of three replicates. Polo, Andrea, et al. Photochemistry and photobiology 87.6 (2011): 1387-1394.

The photocatalytic ability of titanium dioxide nanopowders (TiO2) was exploited as a biofilm control agent. Two photocatalytic systems were investigated: a suspension of 3 g of TiO2 nanopowder in demineralized water and a glass slide coated with a TiO2 thin film achieved by sol-gel deposition. The operating protocol for the photoactivation of TiO2 was established using the dye Rhodamine B. The microorganisms investigated were Pseudomonas stutzeri, Pseudomonas aeruginosa, and a group of Bacillus cereus as planktonic cells. Pseudomonas aeruginosa biofilms were also investigated at solid-liquid and solid-air interfaces. TiO nanopowders resulted in a 1-log reduction of Bacillus. Compared to non-photoactivated TiO2, a 2-log reduction of planktonic cells was achieved within 24 h, a 2-log reduction of P. stutzeri planktonic cells within 30 min, and a 1-log reduction of P. aeruginosa planktonic cells within 2 h. The TiO2 film almost completely eliminated P. aeruginosa planktonic cells (initial concentration 10cells mL) within 24 h, whereas UV-A light alone reduced them by 3 logs. In contrast, photocatalytic treatment with either TiO2 film or TiO2 nanopowder had no effect on P. aeruginosa biofilms at all investigated interfaces.
The samples to be ignited were placed in a noncommercial chamber equipped with an 18 W BLB lamp emitting radiation over 350-410 nm (maximum emission at 370 nm). The dye rhodamine B (rhoB) was present, Bacillus sp. Since P. aeruginosa is more sensitive to UV light (34), the illuminance used was 1200 lW cm for planktonic culture tests and 500 lW cm for biofilm tests. In all cases, the UV-A intensity used was always greater than 1 lW cm, which is sufficient to initiate the photocatalytic reaction. The chamber also housed a platform shaker to keep the TiO2 powder in suspension during testing with dye solutions and planktonic cultures, and pH was measured by a 3210 pH meter (Jenway) before treatment and at multiple testing times. In all experiments, four conditions were tested: (1) the presence of TiO2 and UV-A light (TiO + UV+), (2) the absence of TiO2 and the presence of UV-A light (TiO UV+), (3) the presence of TiO2 in the dark (TiO+ UV), and (4) the absence of TiO2 in the dark (TiO UV+).

In situ measurement of optical properties of titanium dioxide nanopowders

XRD patterns of TiO2 submicro- and nanopowders Mikhailov, M. M., V. V. Neshchimenko, and S. A. Yuryev. Radiation Physics and Chemistry 121 (2016): 10-15.

The reflectance spectra of micron and nanopowder titanium dioxide before and after irradiation with 30 keV electrons were studied in situ and ex situ. The particle size range is 60-240 nm. It was determined that the reduction in particle size leads to an increase in intrinsic defects. Particles with intrinsic defects are transformed into absorption centers during irradiation due to optical degradation of titanium powder. High radiation stability with particle size range of 80-160 nm. The study showed a general pattern of in situ spectral reflectance of titanium dioxide nanoparticles and submicron particles before and under irradiation with 30 keV electrons, with some minor differences observed after 10Torr air reduction irradiation. Reducing particle size and increasing specific surface area leads to an increase in the concentration of intrinsic defects and free electrons on the particle surface. This results in an absorption band rise and a decrease in spectral reflectance. The decrease in reflectance is greater for titanium dioxide powders with a large specific surface area.
The samples were prepared by applying 1 MPa pressure to the powder in a metal cup with a diameter of 28 mm and a depth of 2 mm. The sample has been fixed on the table of the space environment simulator. A high vacuum (5±10Torr) was set in the chamber. The diffuse reflectance spectra were measured in the range of 300-2000 nm by an integrating sphere. Then the sample was irradiated with electrons with an energy of 30 keV and a fluence of 0.5, 1, 2·10 cm. The electron flux during irradiation was 4×10 cms. The electron beam irregularity on the area sample did not exceed 5%. It was determined by the slit aperture method. The 30 keV electron energy was chosen because electrons with an energy of 10-100 keV have the largest flux in orbits such as the geosynchronous equatorial orbit. The main components of the residual gas at this pressure are H, N, CO and Ar. The oxygen partial pressure is about 10Torr. After each radiation exposure, the spectrum was measured in vacuum (in situ). The sample was fixed on a sample stage thermostated at 300 K. Therefore, the temperature of all samples was the same as that during the reflection spectrum measurement and irradiation. Thereafter, the powders were displaced in a residual vacuum of 10Torr for 100 h, and their reflection spectra were then measured.

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Hot Products

Titanium Dioxide Nanopowder, P25 Grade

The effect of Titanium Dioxide Nanopowder on the micro -structure of tin lead solder

Photocatalytic decolorization of dyes by titanium dioxide nanopowders

Effect of Titanium Dioxide Nanopowders and Coatings on Planktonic Pseudomonas aeruginosa

In situ measurement of optical properties of titanium dioxide nanopowders

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