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Synthesis of TiO_2 Nanoparticles in Reverse Microemulsion and Their Photocatalytic Activity
Lee, ManSig,Lee, Gun-Dae,Park, Seong-Soo,Hong, Seong-Soo 한국공업화학회 2003 Journal of Industrial and Engineering Chemistry Vol.9 No.1
TiO₂nanoparticles were prepared using hydrolysis of titanium tetraisopropoxide (TTIP) in W/O microemulsions consisting of water, nonionic surfactant, and cyclohexane. The physical properties of nanosized TiO₂have been investigated by TEM, XRD, FT-lR, TGA and DTA. In addition, the photocatalytic degradation of p-nitrophenol has been studied by using batch reactor in the presence of UV light in order to compare the photocatalytic activity of prepared nanosized titania. TiO₂ particles calcined at 500℃ have a stable anatase phase which has no organic surfactants. Above 300℃, the product completely transforms into the anatase phase and the rutile phase begins to appear at 600℃. The crystallite size and crystallinity increase with an increase of calcination temperature. The particles are shown to have a spherical shape and have an uniform size distribution. In adition, the size of particles increases with an increase of W?? ratio and a decrease of hydrocarbon chain length. In the photocatalytic degradation of p-nitrophenol, the titania calcined at 500℃ shows the highest activity on the photocatalytic degradation of ρ-nitrophenol and the pure anatase structure.
Seong Soo Joo, Da Woom Seo, Hee Jung Kim, Su Kil Jang, Mansig Jun 충북대학교 동물의학연구소 2013 Journal of Biomedical and Translational Research Vol.14 No.2
The aim of the current study was to analyze the active ingredients and to screen the pharmacological properties of freshwater laver, Prasiola japonica, the only species grown in Korea. According to results of gas chromatography-mass spectrometry assay, components from P. japonica were more diverse than those from sea laver. Of particular interest, our results indicated that ethanol extract of P. japonica (PJE) contained loliolide, sorbitol, mannitol, and alverine, which were known to have an anti-oxidant, anti-oral microbial, osmotic diuresis, and smooth muscle relaxant, respectively. In addition, five solvent fractions of PJE (water, butanol, chloroform, ethyl acetate, and hexane) significantly inhibited the production of lipopolysaccharide-induced nitric oxide and a higher amount (>100 μg/mL) of chloroform, ethyl acetate, and hexane fraction were considered to play a specific role in cancer cell death. PJE and its solvent fractions found to be effective scavengers of free radicals, particularly, hydroxyl radicals. Glucose uptake in L6 myoblast cell line that stably expresses the glucose transporter type 4 (GLUT4) proteins was also remarkably enhanced upon treatment with solvent fractions, remarkably chloroform fraction. Taken together, we concluded that P. japonica may have potent pharmacological properties and thus contribute to development of novel natural candidates for various disease targets.