Publications by authors named "Shozi Mishima"
We report here on the removal of alkylphenols (phenol, 4-n-propylphenol, 4-n-heptylphenol and 4-nonylphenol) dissolved in water using the composite particles of nanocrystalline titania and alkyltrimethylammonium bromide (CnH2n+1N(CH3)3Br, CnTAB; n=12, 14, 16 and 18) (named as TiO2/CnTAB Nanoskeleton) as adsorbents and photocatalysts. In particular, the adsorption of alkylphenols onto TiO2/CnTAB Nanoskeleton in water was investigated in terms of hydrophobic interaction between alkylphenols and CnTAB, surface area, pore structure and crystal size of TiO2/CnTAB Nanoskeleton. We revealed that CnTAB incorporated in the TiO2/CnTAB Nanoskeleton promotes the adsorption of alkylphenols onto TiO2/CnTAB Nanoskeleton due to the hydrophobic interaction between alkylphenols and CnTAB.
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- The study investigates how different segments of poly(ethylene oxide)-containing block copolymers (PEO-BCP) influence the reduction of tetrachloride gold(III), as well as the stability and morphology of formed gold nanoparticles in water.
- The researchers found that the reduction activity of various PEO-BCP types followed a specific order, indicating that the presence of amino groups and specific polymer structures affects how well they can reduce gold ions.
- Among the tested polymers, the amino-terminated variant showed the highest colloidal stability and produced the smaller gold nanoparticles compared to other formulations, highlighting the importance of polymer design in controlling nanoparticle properties.
We report here a facile synthetic method and surface modification of gold nanoparticles using amino-terminated poly(ethylene oxide)-poly(propylene oxide) block copolymers (CH3-[OCH2CH2]x-[OCH2CH(CH3)]y-NH2; EO(x)PO(y)NH2) (SURFONAMINE) as media, reducing agents, stabilizing agents and surface-modifying agents. Gold nanoparticles were synthesized through autoreduction of hydrogen tetrachloroaureate(III) hydrate (HAuCl4 x 3H2O) by SURFONAMINE as media and reducing agents at ambient conditions (approximately 25 degrees C). The AuCl4- reduction and gold nanoparticle formation were promoted by SURFONAMINE with longer PEO segment and heating.
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