다중혈관 관상동맥 환자에서 y-문합을 이용하여 양쪽 내흉동맥만을 사용한 우회술의 조기 성적

[신간의 별자리x] 우리/미술, 그리고 ‘슬픔의 박물관’

Fujishima and Honda (1972) demonstrated the potential of titanium dioxide (TiO2) semiconductor materials to split water into hydrogen and oxygen in a photo-electrochemical cell. Their work triggered the development of semiconductor photocatalysis for a wide range of environmental and energy applications. One of the most significant scientific and commercial advances to date has been the development of visible light active (VLA) TiO2 photocatalytic materials. In this review, a background on TiO2 structure, properties and electronic properties in photocatalysis is presented. The development of different strategies to modify TiO2 for the utilization of visible light, including non metal and/or metal doping, dye sensitization and coupling semiconductors are discussed. Emphasis is given to the origin of visible light absorption and the reactive oxygen species generated, deduced by physicochemical and photoelectrochemical methods. Various applications of VLA TiO2, in terms of environmental remediation and in particular water treatment, disinfection and air purification, are illustrated. Comprehensive studies on the photocatalytic degradation of contaminants of emerging concern, including endocrine disrupting compounds, pharmaceuticals, pesticides, cyanotoxins and volatile organic compounds, with VLA TiO2 are discussed and compared to conventional UV-activated TiO2 nanomaterials. Recent advances in bacterial disinfection using VLA TiO2 are also reviewed. Issues concerning test protocols for real visible light activity and photocatalytic efficiencies with different light sources have been highlighted.

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A review on the visible light active titanium dioxide photocatalysts for environmental applications

The science and technology of ultracapacitors are reviewed for a number of electrode materials, including carbon, mixed metal oxides, and conducting polymers. More work has been done using microporous carbons than with the other materials and most of the commercially available devices use carbon electrodes and an organic electrolytes. The energy density of these devices is 3¯5 Wh/kg with a power density of 300¯500 W/kg for high efficiency (90¯95%) charge/discharges. Projections of future developments using carbon indicate that energy densities of 10 Wh/kg or higher are likely with power densities of 1¯2 kW/kg. A key problem in the fabrication of these advanced devices is the bonding of the thin electrodes to a current collector such the contact resistance is less than 0.1 cm2. Special attention is given in the paper to comparing the power density characteristics of ultracapacitors and batteries. The comparisons should be made at the same charge/discharge efficiency.

Ultracapacitors: Why, How, and Where is the Technology

This review paper encompasses a detailed study of semiconductor metal oxide (SMO) gas sensors. It provides for a detailed comparison of SMO gas sensors with other gas sensors, especially for ammonia gas sensing. Different parameters which affect the performance (sensitivity, selectivity and stability) of SMO gas sensors are discussed here under. This paper also gives an insight about the dopant or impurity induced variations in the SMO materials used for gas sensing. It is concluded that dopants enhance the properties of SMOs for gas sensing applications by changing their microstructure and morphology, activation energy, electronic structure or band gap of the metal oxides. In some cases, dopants create defects in SMOs by generating oxygen vacancy or by forming solid solutions. These defects enhance the gas sensing properties. Different nanostructures (nanowires, nanotubes, heterojunctions), other than nanopowders have also been studied in this review. At the end, examples of SMOs are given to illustrate the potential use of different SMO materials for gas sensing.

Semiconductor metal oxide gas sensors: A review

Correction for 'Comparative study on formic acid sensing properties of flame-made Zn2SnO4 nanoparticles and its parent metal oxides' by Matawee Punginsang et al., Phys. Chem. Chem. Phys., 2023, 25, 15407-15421, https://doi.org/10.1039/D3CP00845B.

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Correction: Comparative study on formic acid sensing properties of flame-made Zn2SnO4 nanoparticles and its parent metal oxides.

In this work, thermal chemical vapor deposition with gravity effect and water-assisted selective etching have been employed to synthesize vertically aligned carbon nanotubes (CNTs) with high aspect ratio and low defect density. CNTs were grown by placing the substrate upside down along gravitational field and the periodic introduction of acetylene and low concentration water vapor through argon. The water vapor concentration and its introduction time are optimized for stackless growth of catalyst-removed CNTs. The water vapor concentration of 300 ppm and introduction time of 3 minutes was found to be an optimum condition. Vertically aligned CNTs of 8-15 nm in diameter and nearly 90 mum long are achieved. Characterization of CNTs by transmission electron microscope (TEM) confirms that the CNTs are of good quality with low defects and almost catalyst-free. Moreover, the fabricated CNTs have been characterized for electron field emission applications. The high aspect ratio CNTs exhibits reproducible low field emission with turn-on electric field of ~3 V/mum.

Characterization of stackless vertically aligned carbon nanotube synthesized by thermal CVD with gravity effect and water-assisted etching

Reverse transcription loop-mediated isothermal amplification (RT-LAMP) assay is a novel method of gene amplification that amplifies nucleic acid, which can be applied for disease diagnosis in shrimp aquaculture. During the LAMP reaction, the white precipitate of magnesium pyrophosphate (Mg 2 P 2 O 7 ) is formed correlates with the amount of synthesized DNA. So, the turbidity can be measured. In this study, a portable turbidimeter has been developed for field to detection of Taura Syndrome Virus (TSV) that causes large economic losses to most major shrimp-producing countries including Thailand. The device could maintain an optimal temperature (63 °C) for 25 µl of LAMP sample solution contained in a 0.2 ml commercial PCR tube. We also applied the spectroscopic measurement technique to monitor a by-product of LAMP reaction, light emitting diode (LED) was used as a light source. Light dependent resistance (LDR) was used as detector. The results obtained from turbidity measurement revealed the same detection limit to those from agarose gel electrophoresis method.

Turbidity detection of shrimp Taura Syndrome Virus by loop-mediated isothermal amplification reaction

Rapid Fabrication of Close-Typed Electrowetting on Dielectric Devices

Plasma surface modification of two-component composite scaffolds consisting of 3D-printed and electrospun fiber components from biodegradable PLGA and PLCL

Adisorn Tuantranont

Papers

Correction: Comparative study on formic acid sensing properties of flame-made Zn2SnO4 nanoparticles and its parent metal oxides.

Characterization of stackless vertically aligned carbon nanotube synthesized by thermal CVD with gravity effect and water-assisted etching

Turbidity detection of shrimp Taura Syndrome Virus by loop-mediated isothermal amplification reaction

Rapid Fabrication of Close-Typed Electrowetting on Dielectric Devices

Plasma surface modification of two-component composite scaffolds consisting of 3D-printed and electrospun fiber components from biodegradable PLGA and PLCL