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RISS 인기검색어
- 검색키워드
- 저자 : Noriaki Sano (검색결과 4 건)
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Facile strategy for stability control of gold nanoparticles synthesized by aqueous reduction method
Tanyakorn Muangnapoh,Noriaki Sano,Shin-Ichi Yusa,Nawin Viriya-empikul,Tawatchai Charinpanitkul 한국물리학회 2010 Current Applied Physics Vol.10 No.2
A facile strategy for controlling sizes and stabilities of gold nanoparticles synthesized by aqueous reduction method was experimentally examined and reported. When pH of the solution of HAuCl4 and Na3C6H5O7 was controlled by introducing either NaOH or HCl with different concentration, the zeta potential of suspension of gold nanoparticles changed accordingly. With the strategy using a control of pH in a range of 5–9, the zeta potential of synthesized gold nanoparticles was regulated in a range of -60 to -40 mV, resulting in a stable red suspension of gold nanoparticles. Under a condition with pH < 5.0, gold nanoparticles could agglomerate after being kept quiescently for a day due to an adsorption of H+ on their surface, which in turn enhanced the attractive van der Waals interaction. On the other hand, synthesis of gold nanoparticles with pH > 9.1 would provide a lower amount of gold nanoparticles due to the formation of NaAuO2. Based on these results, a potential mechanism of gold nanoparticle synthesis was also discussed.
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Pramote Puengjinda,Noriaki Sano,Wiwut Tanthapanichakoon,Tawatchai Charinpanitkul 한국공업화학회 2009 Journal of Industrial and Engineering Chemistry Vol.15 No.3
Selective synthesis of well aligned multi-walled carbon nanotubes (MW-CNT) and multi-shelled carbon nanocapsule (MS-CNC) using pyrolysis of naphthalene with the presence of ferrocene was experimentally examined. With higher mole fraction of naphthalene to ferrocene, more MW-CNTs could be synthesized due to higher concentration of carbonaceous precursors emerging from the decomposed naphthalene. Based on kinetic analysis, at lower temperature, MW-CNTs could preferably be synthesized due to the controlled supply of carbonaceous clusters to get onto the surface of Fe clusters. On the other hand, at temperature higher than 900℃ the Fe clusters become more active to catalyze carbonaceous precursors to undergo self assembling process of MS-CNCs. With cheaper cost of naphthalene compared with other high-value hydrocarbons, usage of naphthalene would provide an advantage of reasonably economical synthesis of MW-CNT or MS-CNC.
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Hydrothermal synthesis of titanate nanostructures with high UV absorption characteristics
Nawin Viriya-Empikul,Noriaki Sano,Takeyuki Kikuchi,Sareeya Bureekaew,Wiwut Tanthapanichakoon,Tawatchai Charinpanitkul 한국공업화학회 2010 Journal of Industrial and Engineering Chemistry Vol.16 No.1
The titanate nanostructures with high UV absorption characteristics could be fabricated by hydrothermal method within a temperature range of 90–150 8C. TEM, XRD, BET analyses, and UV–vis spectroscopy were employed to elucidate the synthesized titanate nanostructure characteristics which were microstructure, phase transformation, specific surface area, and band gap energy, respectively. With an increase in the hydrothermal treating temperature from 90 to 120 8C, the specific surface area of titanate nanostructures was increased from 83 to 258 m2/g,while the band gap energy of titanate nanostructures was increased from 3.44 to 3.84 eV and then slightly decreased to 3.81 eV at 150 8C. The fabricated titanate nanostructures could exhibit higher UV adsorption capability but lower photocatalytic activity when compared with that of commercial TiO2 powders.
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Takahiro Utsumi,Mineo Iwatate,Wataru Sano,Hironori Sunakawa,Santa Hattori,Noriaki Hasuike,Yasushi Sano 대한소화기내시경학회 2015 Clinical Endoscopy Vol.48 No.6
Narrow-band imaging (NBI) is a new imaging technology that was developed in 2006 and has since spread worldwide. Because of its convenience, NBI has been replacing the role of chromoendoscopy. Here we review the efficacy of NBI with/without magnification for detection, characterization, and management of colorectal polyps, and future perspectives for the technology, including education. Recent studies have shown that the next-generation NBI system can detect significantly more colonic polyps than white light imaging, suggesting that NBI may become the modality of choice from the beginning of screening. The capillary pattern revealed by NBI, and the NBI International Colorectal Endoscopic classification are helpful for prediction of histology and for estimating the depth of invasion of colorectal cancer. However, NBI with magnifying colonoscopy is not superior to magnifying chromoendoscopy for estimation of invasion depth. Currently, therefore, chromoendoscopy should also be performed additionally if deep submucosal invasive cancer is suspected. If endoscopists become able to accurately estimate colorectal polyp pathology using NBI, this will allow adenomatous polyps to be resected and discarded; thus, reducing both the risk of polypectomy and costs. In order to achieve this goal, a suitable system for education and training in in vivo diagnostics will be necessary.
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