We demonstrated chemical etching of a marine diatom shell with 1 N NaOH for controlling the pore size of nanoporous structures of the shell under various conditions. Scanning electron microscopy (SEM) images clearly revealed that the pore size of the diatom shells was regulated in the case of etching at 25 degrees C. In contrast, fluctuations in the etched structures was relatively high even during short periods degradation at 40, 60, and 90 degrees C; therefore, controlled nanoporous structures could not be fabricated. This is the first example of artificial modification of natural diatom shells at the nanoscale although diatom shells have been widely used in industry. In addition, a backbone-like structure was observed during the etching process. The structure was similar to the intermediate structure observed during the primitive stage of the diatom cell growth. Probably, this information is valuable for studying the mechanism of nanoporous structures of diatoms.
Green of Japanese Jewel beetle: Unexpectecl Vliriability of Color Caused by Structurat Change of Organic Muttilayer C)EikiAduchl Nihon 1'oreal K. K. R&D center Japancse jewel beetle (Chrysochroa futgidissima) is ene ot' beuutiful bcetlc widely 11ving in East Asia, called Yinmuto-tttmamushi in Japanese. The body size is almest 4 cm x l cm and the color is meLal]ie greci; two dark brown strips are on
A successful reduction of p-nitrophenol was carried out on the surface of novel CuFe 2 O 4. Copper ferrite (CuFe 2 O 4) nanoparticles were prepared via simple co-precipitation reaction in presence of a capping agent. The prepared nanoparticles was investigated by DSC (Differential Scanning Calorimeter) and the crystalline structure and size were estimated by XRD (X-Ray diffraction). The experimental results have pointed out the high catalytic activity towards the reduction of p-nitrophenol to p-aminophenol (important intermediate for paracetamol and analgesic drugs) which improved greatly by using polymer as capping agent, where it exhibited several advantages such as low-cost, stability and rapid separation.
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