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Visible-photoresponsive Nitrogen-Doped Mesoporous TiO2 Films for Photoelectrochemical Cells
배재영,Tae Kwan Yun,안광순,김재홍 대한화학회 2010 Bulletin of the Korean Chemical Society Vol.31 No.4
Nitrogen-doped TiO2 (TiO2:N) nano-particles with a pure anatase crystalline structure were successfully synthesized through the hydrolysis of TiCl4 in an ammonia aqueous solution. The samples were characterized using X-ray diffraction (XRD), transmission electron microscopy (TEM), N2-sorption, and UV-vis diffuse reflectance spectra (UV-vis DRS)techniques. The absorption edge of nitrogen-doped TiO2 shifted into the visible wavelength region. The photoelectrochemical (PEC) performances were investigated for the TiO2 mesoporous electrodes doped with different nitrogen concentrations. The TiO2:N electrodes exhibited much higher PEC responses compared to the pure TiO2 electrode because of the significantly enhanced visible-photoresponsibility of the TiO2:N electrodes.
Preparation and Optical Characterization of Mesoporous Silica Films with Different Pore Sizes
배재영,최석호,배병수 대한화학회 2006 Bulletin of the Korean Chemical Society Vol.27 No.10
Mesoporous silica films with three different pore sizes were prepared by using cationic surfactant, non-ionic surfactant, or triblock copolymer as structure directing agents with tetramethylorthosilicate as silica source in order to control the pore size and wall thickness. They were synthesized by an evaporation-induced self-assembly process and spin-coated on Si wafer. Mesoporous silica films with three different pore sizes of 2.9, 4.6, and 6.6 nm and wall thickness ranging from ~1 to ~3 nm were prepared by using three different surfactants. These materials were optically transparent mesoporous silica films and crack free when thickness was less than 1 m m. The photoluminescence spectra found in the visible range were peaked at higher energy for smaller pore and thinner wall sized materials, consistent with the quantum confinement effect within the nano-sized walls of the silica pores.
Unique Fluid Ensemble including Silicone Oil for the Application of Optical Liquid Lens
배재영,박성수,김재홍,박진호,Young Chul Choi,Ha Yong Jung 대한화학회 2008 Bulletin of the Korean Chemical Society Vol.29 No.4
The fluid ensemble in the liquid lens, which is composed of electrolyte and silicone oil, is the key material system to vary the focal length processing of the electrochemical desorption. In order to characterize the capability of the liquid lens according to response time and optical range, we prepared a fluid ensemble comprising the electrolyte and oil. To elucidate the physical mechanism of the effective response time, we examined the viscosity dependency while satisfying the requirements for the density and refractive index of the electrolyte and oil, respectively. The characterization results indicated that the response time (up and down) is influenced by the viscosity of the electrolyte and oil. On this basis, we prepared a fluid ensemble capable of reversibly adjusting for the focal length of the liquid lens, as well as the response time. The ensemble is applicable to various systems such as micro-lens and optical sensors.
황산 마그네슘의 주입이 복강경하 위절제술 중 혈역학적 안정을 위한 remifentanil 요구량에 미치는 영향
배재영,김동영,김정호,이수일,이종환,이승철,최소론,이지현,박상융 대한마취통증의학회 2015 Anesthesia and pain medicine Vol.10 No.2
Background: Magnesium is known to reduce the requirement of analgesic agents by blocking calcium channels that exist at the neuronal and neuromuscular junctions. However, former studies have shown inconsistent results regarding this concept. Therefore, we investigated the effects of magnesium on remifentanil requirements for achieving hemodynamic stabilization in patients undergoing laparoscopic gastrectomy. Methods: Laparoscopic gastrectomy patients (n = 30) were randomly divided into two groups. Group M received 50 mg/kg of magnesium sulfate for 15 minutes prior to the induction of anesthesia. Then, 20 mg/kg/h of magnesium was administered during the operation time. Group N was administered the same amount of saline. Anesthesia was maintained with intravenous propofol and remifentanil injection. Vecuronium (0.1 mg/kg) was administered before intubation, and an additional 0.02 mg/kg was administered if a T1 twitch response was observed during surgery. Anesthetic time was standardized to provide an appropriate comparison of all patients. During 100 minutes, total anesthetic requirements and anesthetic requirements at every 10 minutes were analyzed. Postoperative pain was controlled with a patient controlled analgesia device. Results: The remifentanil and vecuronium requirements during 100 minutes were significantly lower in Group M. There was no significant difference in propofol requirements between the two groups. No significant difference was observed in mean arterial pressure and heart rate. Postoperative VAS, PONV, or shivering also did not show any difference between the two groups. Conclusions: Magnesium reduced remifentanil and vecuronium requirements but not propofol requirements. Magnesium seems to have antinociceptic properties and reduces remifentanil requirements.