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Fine and ultrafine particle- and gas-polycyclic aromatic hydrocarbons affecting southern Thailand air quality during transboundary haze and potential health effects

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Journal of Environmental Sciences 2023年第2期124卷 253-267页

作者： Napawan Mahasakpan Phatsarakorn Chaisongkaew Muanfun Inerb Nobchonnee Nim Worradorn Phairuang Surajit Tekasakul Masami Furuuchi Mitsuhiko Hata Thaniya Kaosol Perapong Tekasakul Racha Dejchanchaiwong Air Pollution and Health Effect Research Center Prince of Songkla UniversityHat YaiSongkhla 90110Thailand Energy Technology Program Faculty of EngineeringPrince of Songkla UniversityHat YaiSongkhla 90110Thailand Faculty of Environmental Management Prince of Songkla UniversityHat YaiSongkhla 90110Thailand Department of Geography Faculty of Social SciencesChiang Mai UniversityMuangChiang Mai 50200Thailand Department of Chemistry Faculty of SciencePrince of Songkla UniversityHat YaiSongkhla 90110Thailand Faculty of Geoscience and Civil Engineering Institute of Science and EngineeringKanazawa UniversityKakuma-machiKanazawaIshikawa 920-1192Japan Department of Civil and Environmental Engineering Faculty of EngineeringPrince of Songkla UniversityHat YaiSongkhla 90110Thailand Department of Mechanical and Mechatronics Engineering Faculty of EngineeringPrince of Songkla UniversityHat YaiSongkhla 90110Thailand Department of Chemical Engineering Faculty of EngineeringPrince of Songkla UniversityHat YaiSongkhla 90110Thailand

Distribution of PM_(0.1),PM_(1) and PM_(2.5) particle-and gas-polycyclic aromatic hydrocarbons(PAHs)during the 2019 normal,partial and strong haze periods at a background location in southern Thailand were investigated to understand the behaviors and carcinogenic ***1 was the predominant component,during partial and strong haze periods,accounting for 45.1% and 52.9% of total suspended particulate matter,respectively,while during normal period the contribution was only 34.0%.PM_(0.1) concentrations,during the strong haze period,were approximately 2 times higher than those during the normal *** increased levels of particle-PAHs for PM_(0.1),PM_(1) and PM_(2.5) were observed during strong haze period,about 3,5 and 6 times higher than those during normal ***-PAH concentrations were 10 to 36 times higher than those of particle-PAHs for PM_(2.5).Average total Benzo[a]Pyrene Toxic Equivalency Quotients(BaP-TEQ)in PM_(0.1),PM_(1) and PM_(2.5) during haze periodswere about 2–6 times higher than in the normal *** total accumulated Incremental Lifetime Cancer Risks(ILCRs)in PM_(0.1),PM_(1) and PM_(2.5) for all the age-specific groups during the haze effected scenario were approximately 1.5 times higher than those in nonhaze scenario,indicating a higher potential carcinogenic *** observations suggest PM_(0.1),PM_(1) and PM_(2.5) were the significant sources of carcinogenic aerosols and were significantly affected by transboundary haze from peatland *** leads to an increase in the volume of smoke aerosol,exerting a significant impact on air quality in southern Thailand,as well as many other countries in lower southeast Asia.

关键词： particle-PAH Gas-PAH ultrafine particle Health risk Source identification

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Specific Property of ultrafine particle Classification

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Journal of Wuhan University of Technology(Materials Science) 2003年第2期18卷 82-84页

作者：黎国华 Wuhan University of Technology

In the process of ultrafine particle classification,the separation curve,which reflects the characteristics of separating process,is frequently influenced by the characteristics of separation flow field and operating parameters,*** paper introduces the concept of system deviation and deduces the calculating method of the separation ***,it analyses the influences of classification flow field's specific properties and some operating parameters on the separation *** results show that,in the process of ultrafine particle classification,the local vortex in the separation field improves the separation efficiency to a certain degree,but the accuracy will decrease;the coacervation action of particles will seriously influence the classification accuracy.

关键词： ultrafine particle classification separation curve system deviation

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Preparation and Characterization of CeO_2-ZrO_2 Solid Solution ultrafine particles Using Reversed Microemulsion

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Journal of Rare Earths 2005年第4期23卷 416-419页

作者：安源李丽王军沈美庆 Key Laboratoryfor Green Chemical TechnologyofState Education Ministry School of Chemical Engineering &Technology Tianjin University Tianjin 30007 China State Key Laboratory ofEngines Tianjin UniversityTianjin 300072 China

Ce0.6Zr0.4O2 solid solution ultrafine particle was prepared in the cyclohexane/water/OP-10/n-hexanol reversed microemulsion. The quasi-ternary phase diagram investigations showed that the system has narrow W/O type microemulison region, so it is the proper system to prepare Ce0.6Zr0.4O2 solid solution ultrafine particle. Some physical-chemical techniques such as TG/DTA, XRD, BET, and HRTEM are used to characterize the resultant powders. The results show that the fluorite cubic Ce0.6Zr0.4O2 solid solution is obtained at 400 ℃. The surface area is （146.7 m^2·g^-1）, which is higher than the surface area for sol-gel prepared sample （59.5m^2·g^-1）. HRTEM images indicated that the Ce0.6Zr0.4O2 solid solution ultrafine particle is well-crystallized, narrow size distribution, less agglomeration, within mean size of 5 -7 nm.

关键词： reverse microemulsion CeO2-ZrO2 solid solution ultrafine particle rare earths

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Characterization of ultrafine particles from hardfacing coated brake rotors

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Friction 2023年第1期11卷 125-140页

作者： Yezhe LYU Ankur SINHA Ulf OLOFSSON Stefano GIALANELLA Jens WAHLSTRÖM Department of Mechanical Engineering Sciences Lund UniversityLund SE-22100Sweden Department of Machine Design KTH Royal Institute of TechnologyStockholm SE-10044Sweden Department of Industrial Engineering University of TrentoTrento 38123Italy

Automotive brake rotors are commonly made from gray cast iron(GCI).During usage,brake rotors are gradually worn off and periodically ***,replaced brake rotors are mostly remelted to produce brand-new cast iron products,resulting in a relatively high energy consumption and carbon footprint into the *** addition,automotive brakes emit airborne *** of the emitted particles are categorized as ultrafine,which are sized below 100 nm,leading to a series of health and environmental *** this study,two surface treatment techniques are applied,ie.,high-velocity oxygen fuel(HVOF)and laser cladding(LC),to overlay wear-resistant coatings on conventional GCI brake rotors in order to refurbish the replaced GCI brake rotor and to avoid the remelting *** two coating materials are evaluated in terms of their coefficient of friction(CoF),wear,and ultrafine particle emissions,by comparing them with a typical GCI brake *** results show that the CoF of the HVOF disc is higher than those of the GCI and LC ***,HVOF disc has the lowest wear rate but results in the highest wear rate on the mating brake pad *** LC disc yields a similar wear rate as the GCI *** ultrafine particles from the GCI and LC discs appeared primarily in round,chunky,and flake *** HVOF disc emits unique needle-shaped *** the ultrafine particle range,the GCI and HVOF discs generate particles that are primarily below 100 nm in the running-in period and 200 nm in the steady ***,the LC disc emitted particles that are primarily~200 nm in the entire test run.

关键词： ultrafine particle high-velocity oxygen fuel laser cladding brake particle size distribution particle morphology

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Improving flow and fluidization quality of fine and ultrafine particles via nanoparticle modulation

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Nano Research 2023年第10期16卷 12013-12025页

作者： Jiaying Wang Yuanyuan Shao Jesse Zhu Department of Chemical and Biochemical Engineering The University of Western OntarioLondonOntario N6A 3K7Canada School of Chemical Engineering and Technology Tianjin UniversityTianjin 300072China Beacons of Excellence Research and Innovation Institute University of NottinghamNingbo 315100China

Fine and ultrafine particles possess great potential for industrial applications ascribed from their huge specific surface area and ability to provide good gas–solid ***,these powders are inherently cohesive,making it challenging to achieve smooth flow and *** challenge can be well-resolved by nanoparticle modulation(nano-modulation),where a small amount of nanoparticles is uniformly mixed with the cohesive fine/ultrafine *** nano-modulation,the fluidization system of cohesive powders exhibits distinguishable minimum fluidization velocity,enlarged bed expansion ratio(particularly the dense phase expansion),and scarcer,smaller,and slower moving bubbles,indicating improved flow and fluidization *** purpose of the current work is to systematically summarize the state-of-the-art progress in the fluidization and utilization of fine and ultrafine particles via the nanoparticle modulation ***,a broader audience can be enlightened regarding this promising fine/ultrafine particle fluidization technology,so as to provoke their attention and encourage interdisciplinary integration and industry-academia collaborative research.

关键词： fine particle ultrafine particle cohesive powder flowability fluidization nanoparticle modulation

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Fluidization in combined acoustic-magnetic field for mixtures of ultrafine particles

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China Particuology 2007年第1期5卷 111-115页

作者： Huie Liu Qingiie Guo State Key Laboratory of Heavy Oil Processing College of Chemistry and Chemical Engineering China University of Petroleum Dongying 257061 Shandong China

Four kinds of SiO2 （5-10 nm）＋ Fe3O4 （44.8 μm） particle were fluidized in a sole acoustic field, a sole magnetic field and a combined acousticmagnetic field. Introduction of a single field, 100 dB/40-60 Hz acoustic or 10 mT magnetic, could suppress plugging and channeling and reduce the superficial minimum fluidization gas velocities, Umf. Combination of both acoustic and magnetic fields demonstrated even more promising results, especially more significant reduction of Umf.

关键词： ultrafine particle Combined acoustic-magnetic field Acoustic field Magnetic field

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ultrafine particles produced by evaporating FeB and Fe Si alloys

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西南师范大学学报(自然科学版) 1999年第5期 551-555页

作者： Li\ Jian,Qiu Xiaoyan,Zhao Baogang,Liu Cunye,Lin Yueqiang Department of Physics,Southwest China Normal University,Chongqing 400715

ultrafine particles were produced by evaporating Fe 90 B 10 in Ar or N 2 atmosphere and Fe 2%Si in N 2 atmosphere(at 133 3 Pa Pressure ) respectively. The phases,sizes,morphologies, magnetism and iron contents of the ultrafine particles were investigated and analyzed by means of transmission electron microscope (TEM),X ray diffraction (XRD) and vibrating samples magnetometer (VSM) at room temperature and chemical *** particles prepared from Fe 90 B 10 in Ar and taking the size of 6 nm,are poor *** particles prepared in N 2 taking the size of 8 nm are non crystal. The morphology of the Fe B particles is identically spherical *** size of Fe Si particles, whose contents are main α Fe and a few Fe 3Si,is about 20 *** magnetic measurement shows that all of the three kinds of particles are ferromagnetic,but the specific saturation magnetization and the maximum coercivity H c at room temperature are very different from iron *** the properties of the particles produced from same Fe based material but in different atmosphere (Ar or N 2) are different from that of particles produced from different Fe based material but in same N 2 *** may be connected with the activity of melting iron before evaporating out.

关键词： ultrafine particle Fe B alloy Fe Si alloy evaporating method

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Studies on the Lanthanum-Modified Lead Titanate ultrafine particles by Raman Spectroscopy

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Chemical Research in Chinese Universities 1998年第2期14卷 76-79页

作者： CUI Ai-li GE Xu-dong HU Yong-qi JIN Yong WANG Xiao-hui Department of Chemical Engineering Tsinghua UniversityBeijing100084 Department of Material Science Tsinghua UniversityBeijing 100084)

Lanthanummodified lead titanate(PLT14) ultrafine particles were synthesized by means of stearic acid gel method. The structure of the samples was characterized using Xray diffraction(XRD) and TEM. The crystal graphic parameters of the samples were calculated. The Raman spectra of PLT14 powders at a high pressure as well as a high temperature reveal that the phase transition pressure or temperature shifts to a lower pressure or temperature with the decrease of grain size.

关键词： Raman spectrum PLT ultrafine particle Size effect

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Formation and growth mechanisms of ultrafine particles in sludge-incineration flue gas

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Waste Disposal and Sustainable Energy 2019年第2期1卷 143-150页

作者： Yanlong Li Jiaqi Man Zhengquan Fang Yunbin Zhao Feng Wang Rundong Li Key Laboratory of Clean Energy College of Energy and EnvironmentShenyang Aerospace UniversityNo.37 Daoyi South AvenueDaoyi Development DistrictShenyang 110136LiaoningPeople’s Republic of China

Atmospheric particulate matter with diameter<2.5μm now makes up much of the air pollution in China,but it is the ultrafine particles(UFPs)with diameter<90 nm that are of particular *** is because UFPs are strongly li... 详细信息

Atmospheric particulate matter with diameterultrafine particles(UFPs)with diameterultrafine particles and to follow the evolution of particle surface elemental composition with increasing particle ***,a comparison of the characteristic time for nucleation,condensation and coagulation was done to estimate the dominant *** results show that the UFPs have generally irregular shapes(cotton-like,irregular balls,sheets,etc.)and that they usually aggregate to form a *** increase in the size of a UFP,the mass fraction of the elements presents clearly changed:Na,K and Fe gradually decreased;while Ca,Si and Al,as well as the heavy metals Cu,Zn and Ni *** time estimation is a convenient and effective tool for identifying the predominant mechanisms during *** this study,calculations of characteristic time were used to reveal a mechanism of vaporization,nucleation,condensation and coagulation,which drives the formation and growth of ultrafine particles.

关键词： ultrafine particle Characteristic time Nucleation Condensation Coagulation

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Effect of ultrafine particles on Flow Field and Transport Properties near the Interface Around a Moving Bubble

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Transactions of Tianjin University 2004年第1期10卷 1-4页

作者：马友光徐世昌冯惠生余国琮 State Key Laboratory of Chemical Engineering School of Chemical Engineering and TechnologyTianjin University

Laser Doppler Anemometer has been used to measure the flow field characteristics near the interface around a moving bubble in the presence of ultrafine particles. In order to model a moving bubble, the bubble was fixed into the counter flow liquid by a metal mesh. Experimental materials are air and water, and the particles are complex oxidate powder. Experiments were carried out under the operating conditions: the liquid flow velocity u 0 is 12.6 cm/s, the equivalent diameter d e is 0.6 cm, the mass concentration of particle is 0.2 0 0 ,the average particle diameter is about 10 nm and the density is 2 g/cm 3. The velocity profiles of both frontal and tail vortex areas were measured respectively. The experimental results show that the velocity fields are obviously changed in the existence of particles. In the frontal area of the bubble, both tangential and normal velocities decrease due to the presence of particles, but in tail vortex area, the tangential velocities increase remarkably, and normal velocities rise gradually from the center towards the fringe in the opposite tendency to that of no particles. The influences of flow field change in the presence of particles on gas liquid mass transfer are analyzed and discussed.

关键词： Laser Doppler Anemometer ultrafine particle moving bubble flow field velocity distribution

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