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Emission of Submicron Aerosol Particles in Operating a Laser Beam Printer
김상윤,김용,변정훈,이대영,황정호 한국정밀공학회 2009 International Journal of Precision Engineering and Vol.10 No.5
Laser beam printers can be substantial sources of submicron particles in the indoor environment. The present work investigated particle emissions from a commercial laser beam printer (LBP), which was one of single component, non-magnetic, non-contact mode type LBPs, in various operating conditions. Size distribution and number concentration of particles were measured by a scanning mobility particle sizer (SMPS). The size distribution of particles generated from the printer was 20-200 nm in equivalent mobility diameter, regardless of the operating condition. When the fuser system was operated by fuser controller without development and the temperature of the heating roller was 190°C, particles were detected and their peak concentration was about 103 particles/cm3. Zero percent coverage white papers and five percent coverage black papers, were used, the peak concentrations were 1.5×105 particles/cm3 and 3.3× 105 particles/cm3, respectively. These results suggest that the sources of submicron particle generation were rubber of heating roller, paper, and toner.
Chen, Guanliang,Lin, Xiujuan,Li, Jianan,Fisher, John G.,Zhang, Yan,Huang, Shifeng,Cheng, Xin Elsevier 2018 CERAMICS INTERNATIONAL Vol.44 No.13
<P><B>Abstract</B></P> <P>Flexible dielectric composite films are highly desirable materials with potential application in capacitors due to their high energy density and discharged efficiency. However, agglomeration induced by the large surface energy of nanoparticles and their large dielectric losses are unfavorable to the improvement of energy density. Submicron lead zirconate titanate (PZT) particles have shown great potential as filler in achieving a high energy storage capacity because of their excellent dielectric properties and good dispersion. In this work, calcined PZT particles were used to prepare PZT/polyvinylidene fluoride (PVDF) composite films. The results showed that composite films of high quality could be obtained even with high contents of submicron PZT particles. The introduction of PZT particles significantly improved the dielectric performance of composite films compared with that of the pristine PVDF film. The discharged energy density of composite films with 10 vol% PZT particles achieved 6.41 J/cm<SUP>3</SUP> at 250 kV/mm. A high efficiency of 87.25% was obtained at 50 kV/mm. These findings confirm the feasibility of PZT particles as inorganic filler in composite films for energy storage applications.</P>
Jianping Zhang,Xiaolei Lu,Dawen Zhao,Pengju Zhang,Jun Hu,Zhiwei Zhang,Baodong Ren 대한환경공학회 2023 Environmental Engineering Research Vol.28 No.4
Aiming at improving the capture performance of inner vortex electrostatic cyclone (ESC), which is widely used in the field of flue gas purification, magnetic field is introduced to remove submicron particles. The theoretical and physical models of electromagnetic dust removal were established, and the dust-removal efficiency of submicron particles under different temperatures and magnetic fields was numerically simulated by FLUENT. The results show that a rise in temperature leads to a reduction in the grade efficiency of submicron particles of ESC, a decrease in the number of escaped particles at lower temperature, and the differences of the rising amplitude in overall efficiency corresponding to the traditional cyclone, which were 36.7%, 34.8%, 33.8%, and 31.9% at four temperatures. The contribution of temperature to the capture of submicron particles decreases continuously with the increasing temperature, but that of magnetic field progressively increases at this time. The magnetic field environment is conducive to the capture of submicron particles, the removal effect is more obvious with the increase of magnetic flux density, but the ascended ranges of magnetic field and temperature both decrease when it reaches 0.5 T. These results can provide a theoretical basis and a technical reference for the design of ESC.
Park, Il-Woo,Park, Chang-Kyun,Lee, Deok-Jin,Yoo, Jea-Soo The Korean Institute of Electrical and Electronic 2003 Transactions on Electrical and Electronic Material Vol.4 No.1
Europium doped yttrium oxide submicron-sized particles were prepared by ultrasonic aerosol pyrolysis. To examine the size effect of submicron-sized-particle, the photoluminescence of the particles was investigated. The particle size was controlled by pH, reaction temperature, molar concentration of yttrium in precursor solution. The PL intensity of submicron-sized particles was decreased with particles size. When the particle size is above about 150 times of Bohr radius of Y$_2$O$_3$, the optical property of the particles shows the bulk characteristics.
IlWooPark,ChangKyunChoi,DaokJinLee,JaeSooYoo 한국전기전자재료학회 2003 Transactions on Electrical and Electronic Material Vol.4 No.1
Europium doped yttrium oxide submicron-sized particles were prepared by ultrasonic aerosol pyrolysis. To examine the size effect of submicron-sized-particle, the photoluminescence of the particles was investigated. The particle size was controlled by pH, reaction temperature, molar concentration of yttrium in precursor solution. The PL intensity of submicron-sized particles was decreased with particles size. When the particle size is above about 150 times of Bohr radius of Y2O3, the optical property of the particles shows the bulk characteristics.
Optical Properties of ZnO Submicron Particles Grown by Using Vapor Phase Transport
김민수,임광국,이동율,김진수,김종수,임재영 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.58 No.4
Metal-catalyst-free ZnO submicron particles were prepared by using vapor phase transport (VPT). Sol-gel spin-coated ZnO seed layers were employed instead of metal catalysts. Temperaturedependent photoluminescence (PL) was carried out to investigate the optical properties of the ZnO submicron particles. The diameter of the hexahedral- and the spherical-shaped ZnO submicron particles was scattered in the range of 100 to 500 nm. Five peaks, at 3.379, 3.364, 3.333, 3.245, and 3.151 eV, corresponding to free exciton (FX), neutral donor bound exciton (D˚X), and first-order longitudinal optical phonon replicas of free excitons (FX-1LO), FX-2LO, and FX-3LO emissions, are obtained at low temperature (10 K). The intensities of these peaks decreased and their position red-shifted with increasing temperature. The thermal activation energy for the exciton with increasing temperature in the ZnO submicron particles was found to be about 53.8 meV, and the values of the fitting parameters for Varshni’s empirical equation were α = 7.4 × 10^(−4) eV/K, β = 680 K, and E_g(0) = 3.380 eV.
Lee, Kyung‐,Ae,Ryu, Min‐,Ju,Kim, Moo‐,Sung,Kang, Wie‐,Soo,Ko, Sanghoon,Shin, Malshick,Chung, Ha‐,Sook Blackwell Publishing Ltd 2011 International journal of food science & technology Vol.46 No.2
<P><B>Summary</B></P><P>Hydrolysis and absorption properties of submicron‐ (below 1 μm) and micron‐sized (over 100 μm) powders of raw rice, heat‐gelatinized rice, fermented rice and wheat were investigated <I>in vitro</I> and <I>in vivo</I>. Nutrient content such as protein, carbohydrate or vitamin C in the samples was not different significantly between submicron‐ and micron‐sized powders, but it showed difference according to processed type of the powders. Submicron‐sized powders were hydrolyzed more easily than micron‐sized powders by α‐amylases such as industrial, human salivary and porcine pancreatic α‐amylase but not by α‐glucosidase in all the tested samples. Patterns of blood glucose change were investigated in rats. The highest glucose levels were obtained at 30 min after oral administration in both submicron‐and micron‐sized powders, but the levels were decreased drastically in groups administered submicron‐sized powders, while they were slow and gradual in groups administered micron‐sized powders. On the contrary, the body weight gained and food efficiency ratios showed a tendency to be decreased slightly in mice fed with submicron‐sized rice powders compared to those with micron‐sized rice powder.</P>
Agglomeration of particles during coal combustion in multistage spouted fluidized tower
Jia-Xun Liu,Jian-Min Gao,Xiao-Feng Wang,Shao-Hua Wu,Ji-Hui Gao 한국화학공학회 2009 Korean Journal of Chemical Engineering Vol.26 No.3
An experimental platform of spray agglomeration has been designed and built for removing small fly ash particles (PM10) from coal combustion. Systematic experiments were conducted in a multistage spouted tower using kinds of agglomerant solutions. The particle concentration increases greatly from the first stage to the second stage of the tower. With the increase of flue gas flow rate the oscillation of impulse signal response curves increases and the internal circulation of the tower intensifies. The influencing factors such as the surfactant, PH value, flow rate of the agglomerant solutions and inlet flue gas temperature were analyzed. SEM was used to analyze the microstructure of the particles. Final results indicate that the special shape of a multistage spouted fluidized tower has significant influences on the effect of agglomeration. The findings from this work will be helpful to form the basis, and provide guidance for, further studies on the control of fine particles such as PM2.5 or even smaller.
Application of magnetic field to iron contained dust capture
Shan Huang,Hae-Woo Park,Young-Min Jo,Young-Koo Park,Youn-Che Kim 한국유화학회 2014 한국응용과학기술학회지 Vol.31 No.1
Indoor air quality including metro subway is of recent interests in large cities. Inflow air to the inside of the train and circulating air flow through MVAC of stations contain large amount of iron based fine particles. This paper evaluated the collection of such a dust by magnetic filters as comparing to conventional particle capturing mechanisms such as inertia, direct impaction and diffusion. It was found that filtration velocity, magnetic field intensity, and fiber size were the most important parameters for magnetic filtration. Application of magnetic force obviously enhances the collection efficiency particularly in fine modes smaller than 10 mm. However, its effect was found greater in 2.5 mm than submicron particles.
Application of magnetic field to iron contained dust capture
Huang, Shan,Park, Hae-Woo,Jo, Young-Min,Park, Young-Koo,Kim, Youn-Che The Korean Society of Applied Science and Technolo 2014 한국응용과학기술학회지 Vol.31 No.1
Indoor air quality including metro subway is of recent interests in large cities. Inflow air to the inside of the train and circulating air flow through MVAC of stations contain large amount of iron based fine particles. This paper evaluated the collection of such a dust by magnetic filters as comparing to conventional particle capturing mechanisms such as inertia, direct impaction and diffusion. It was found that filtration velocity, magnetic field intensity, and fiber size were the most important parameters for magnetic filtration. Application of magnetic force obviously enhances the collection efficiency particularly in fine modes smaller than 10 mm. However, its effect was found greater in 2.5 mm than submicron particles.