Article
Thermodynamics
B. Rossomando, E. Meloni, G. De Falco, M. Sirignano, I Arsie, V Palma
Summary: A detailed experimental characterization of the particle emissions of a EURO 5 light-duty Diesel engine equipped with a wall flow Diesel Particulate Filter (DPF) showed that the DPF has a high removal efficiency for particles, especially in the range of 10-40 nm. Engine operating conditions do not have a significant impact on particle emissions, while particle emissions during the regeneration phase are strongly dependent on DPF temperature.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2021)
Article
Thermodynamics
Christian Axt, Anna Massmeyer, Stefan Pielsticker, Reinhold Kneer
Summary: The formation of inhalable fine particles is a harmful side effect of solid fuel combustion processes, and understanding this process is crucial for environmental protection. Previous studies focused on simplified laminar combustion conditions, while the behavior of turbulent flame structures in real industrial applications remains poorly understood. This study developed a test rig to investigate particulate matter formation and found that local differences play a significant role in particulate matter formation.
COMBUSTION AND FLAME
(2022)
Article
Environmental Sciences
Dexian Chen, Cuizhi Sun, Jun Zhao
Summary: In this study, a new de-smearing method is proposed to reduce the complexity of SMPS data inversion. An analytical formula is derived and included in a full SMPS data inversion scheme. The smearing effect of an SMPS is characterized through voltage step change experiment. The effectiveness and robustness of the de-smearing approach are demonstrated using experimental data.
ATMOSPHERIC ENVIRONMENT
(2024)
Article
Environmental Sciences
Yue Lin, Liem Pham, Xiaoliang Wang, Roya Bahreini, Heejung S. Jung
Summary: The study compared the Fast Mobility Particle Sizer (FMPS) with different inversion matrices to the Scanning Mobility Particle Sizer (SMPS), showing best agreement in specific size ranges but with size-dependent discrepancies in others, highlighting challenges in measurements.
AEROSOL AND AIR QUALITY RESEARCH
(2021)
Article
Engineering, Chemical
Yiliang Liu, Michel Attoui, Yueyang Li, Jianmin Chen, Qing Li, Lin Wang
Summary: The butanol-based Fast CPC was characterized in this study using three types of monodisperse particles. Results showed that both multiple charges and chemical composition affected particle activation, with the effects being more significant under factory temperature settings. The Fast CPC was capable of detecting sub-3 nm particles under boosted temperature settings and can be used for measuring rapidly varying concentrations of small particles.
JOURNAL OF AEROSOL SCIENCE
(2021)
Article
Engineering, Chemical
Jae-Wan Jeon, Seong-Jae Yoo, Yong-Jun Kim
Summary: In this study, a compact and low-cost measurement system was developed to measure the real-time number concentration of airborne ultrafine particles. The system counts particles based on their electrostatic properties using the condensation nucleation method, overcoming the limitations of complex optical systems.
JOURNAL OF AEROSOL SCIENCE
(2022)
Article
Thermodynamics
Gianluigi De Falco, Ingrid El Helou, Pedro M. de Oliveira, Mariano Sirignano, Ruoyang Yuan, Andrea D'Anna, Epaminondas Mastorakos
Summary: It is necessary to better understand particle size distributions (PSDs) from turbulent flames from a theoretical, practical and even regulatory perspective. Experimental results show that dilution air injection significantly affects particle size distributions and black carbon volume fractions in turbulent flames, leading to a reduction in black carbon volume fractions downstream of the dilution jets.
PROCEEDINGS OF THE COMBUSTION INSTITUTE
(2021)
Article
Engineering, Chemical
Yiliang Liu, Michel Attoui, Jianmin Chen, Qing Li, Lin Wang
Summary: This study highlights the importance of neutralizers in achieving charge equilibrium for small particles in high humidity environments, as well as the potential overestimation of particle concentrations by SMPSs under high humidity conditions. Further understanding of the bipolar charging processes under high humidity conditions is needed.
JOURNAL OF AEROSOL SCIENCE
(2021)
Article
Engineering, Chemical
Seong-Jae Yoo, Jae-Wan Jeon, Yong-Jun Kim
Summary: We have developed a water harvesting condensation particle counter (WHCPC) using lab-on-printed circuit board (PCB) technology. Our method provides an inexpensive, compact, and highly accurate system for the ubiquitous monitoring of airborne ultrafine particles (UFPs). The proposed system is able to monitor harmless UFPs using water as the working fluid, without the need for water replenishment using a moderated water condensation method.
JOURNAL OF AEROSOL SCIENCE
(2022)
Article
Engineering, Chemical
Eungchul Kim, Jaewon Lee, Younghun Park, Cheolmin Shin, Jichul Yang, Taesung Kim
Summary: The shape of fumed silica aggregates has an impact on CMP performance, with different proportions of linear and spheroidal aggregates affecting the outcome. The distribution and quantity of contact bumps from bumpy abrasives can explain the results of CMP, and a mixture of spherical and non-spherical abrasives in specific ratios can improve CMP performance.
Article
Engineering, Environmental
Xiaochen Tang, Clement Gambier, Nicolas Lopez-Galvez, Samuel Padilla, Vi H. Rapp, Marion L. Russell, Liana M. Klivansky, Raphael Mayorga, Charles Perrino, Lara A. Gundel, Eunha Hoh, Nathan G. Dodder, S. Katharine Hammond, Haofei Zhang, George E. Matt, Penelope J. E. Quintana, Hugo Destaillats
Summary: Indoor carpets act as a sink and long-term source of thirdhand tobacco smoke contaminants, limiting the effectiveness of remediation strategies. Ozonation was evaluated as an indoor remediation strategy for carpets, but it was found that ozone primarily reacted with carpet fibers rather than eliminating tobacco smoke contaminants. This study highlights the importance of finding alternative methods to effectively remove tobacco smoke contaminants from indoor environments.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Analytical
Maik Bertke, Ina Kirsch, Erik Uhde, Erwin Peiner
Summary: A single-chip differential mobility particle sizer based on resonant micro cantilevers and defined micro-fluidic channels is developed for monitoring airborne nano-sized particles. The instrument can clean polluted cantilevers without disassembling the sensor chip and demonstrates high accuracy in mass concentration measurement.
Article
Engineering, Chemical
K. Lehtipalo, L. R. Ahonen, R. Baalbaki, J. Sulo, T. Chan, T. Laurila, L. Dada, J. Duplissy, E. Miettinen, J. Vanhanen, J. Kangasluoma, M. Kulmala, T. Petaja, T. Jokinen
Summary: Numerous research groups conduct measurements of aerosol particles and clusters smaller than 3 nm in diameter using tools like the Airmodus nano-Condensation Nucleus Counter. By changing the supersaturation of the working fluid, size analysis can provide accurate data for atmospheric field measurements of sub-3 nm clusters and particles.
JOURNAL OF AEROSOL SCIENCE
(2022)
Article
Engineering, Environmental
Zongying Gao, Chunliu Zhu, Lei Yang, Huanyu Liang, Weiqian Tian, Jing Shi, Jingyi Wu, Jingwei Chen, Minghua Huang, Huanlei Wang
Summary: Through the nanoconfinement strategy and electrospinning technique, ultrafine carbon nanofiber-supported Co9S8/WS2@C particles are obtained, leading to exceptional rate performance and stable structural stability. The introduction of β-cyclodextrin during the synthesis process plays a crucial role in the confinement of nanoparticles and the generation of porous structure. The large surface area, ultrafine particles, and rich heterointerfaces in Co9S8/WS2@C@CNF contribute to reducing the diffusion length of Na+ and promoting reaction kinetics. The electrode also demonstrates an ultra-long lifespan in full-cell Na-ion batteries.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Chemical
Francisco J. Higuera, Juan Fernandez de la Mora
Summary: This study investigates a particle condensation device that uses cold and warm humid air streams to achieve water vapor condensation. Compared to existing water condensation particle counters, this configuration offers advantages such as variable saturation ratio, accelerated penetration of water vapor, and a relatively uniform saturation field.
JOURNAL OF AEROSOL SCIENCE
(2024)
Article
Environmental Sciences
U. M. Sofowote, R. M. Healy, Y. Su, J. Debosz, M. Noble, A. Munoz, C. -H. Jeong, J. M. Wang, N. Hilker, G. J. Evans, P. K. Hopke
ATMOSPHERIC ENVIRONMENT
(2018)
Article
Environmental Sciences
Kerolyn K. Shairsingh, Cheol-Heon Jeong, Jonathan M. Wang, Greg J. Evans
ATMOSPHERIC ENVIRONMENT
(2018)
Article
Environmental Sciences
Jonathan M. Wang, Cheol-Heon Jeong, Naomi Zimmerman, Robert M. Healy, Greg J. Evans
ATMOSPHERIC ENVIRONMENT
(2018)
Article
Meteorology & Atmospheric Sciences
P. Joe, S. Belair, N. B. Bernier, V. Bouchet, J. R. Brook, D. Brunet, W. Burrowsws, J. -P. Charlandnd, A. Dehghan, N. Driedger, C. Duhaime, G. Evansns, A. -B. Filion, R. Frenette, J. de Grandpndpndpre, I. Gultepe, D. Hendnderson, A. Herdt, N. Hilker, L. Huang, E. Hung, G. Isaac, C. -H. Jeong, D. Johnsnston, J. Klaassssen, S. Leroyer, H. Lin, M. MacDonald, J. MacPhee, Z. Mariani, T. Munoz, J. Reid, A. Robichaud, Y. Rochon, K. Shairsingh, D. Sills, L. Spacek, C. Stroud, Y. Su, N. Taylor, J. Vanos, J. Voogt, J. M. Wang, T. Wiechers, S. Wren, H. Yang, T. Yip
BULLETIN OF THE AMERICAN METEOROLOGICAL SOCIETY
(2018)
Article
Environmental Sciences
Kerolyn K. Shairsingh, Cheol-Heon Jeong, Jonathan M. Wang, Jeffrey R. Brook, Greg J. Evans
ATMOSPHERIC ENVIRONMENT
(2019)
Article
Environmental Sciences
Cheol-Heon Jeong, Jon M. Wang, Nathan Hilker, Jerzy Debosz, Uwayemi Sofowote, Yushan Su, Michael Noble, Robert M. Healy, Tony Munoz, Ewa Dabek-Zlotorzynska, Valbona Celo, Luc White, Celine Audette, Dennis Herod, Greg J. Evans
ATMOSPHERIC ENVIRONMENT
(2019)
Article
Environmental Sciences
Naomi Zimmerman, Khaled Rais, Cheol-Heon Jeong, Pallavi Pant, Juana Mari Delgado-Saborit, James S. Wallace, Greg J. Evans, Jeffrey R. Brook, Krystal J. Godri Pollitt
SCIENCE OF THE TOTAL ENVIRONMENT
(2019)
Article
Environmental Sciences
Kerolyn K. Shairsingh, Cheol-Heon Jeong, Greg J. Evans
SCIENCE OF THE TOTAL ENVIRONMENT
(2019)
Article
Engineering, Environmental
Eftade O. Gaga, Tom Harner, Ewa Dabek-Zlotorzynska, Valbona Celo, Greg Evans, Cheol-Heon Jeong, Sabina Halappanavar, Narumol Jariyasopit, Yushan Su
ENVIRONMENTAL SCIENCE & TECHNOLOGY LETTERS
(2019)
Article
Environmental Sciences
Robert M. Healy, Jonathan M. Wang, Uwayemi Sofowote, Yushan Su, Jerzy Debosz, Michael Noble, Anthony Munoz, Cheol-Heon Jeong, Nathan Hilker, Greg J. Evans, Geoff Doerksen
ATMOSPHERIC ENVIRONMENT
(2019)
Article
Environmental Sciences
Cheol-Heon Jeong, Sepehr Salehi, Joyce Wu, Michelle L. North, Jong Sung Kim, Chung-Wai Chow, Greg J. Evans
SCIENCE OF THE TOTAL ENVIRONMENT
(2019)
Article
Environmental Sciences
Ewa Dabek-Zlotorzynska, Valbona Celo, Luyi Ding, Dennis Herod, Cheol-Heon Jeong, Greg Evans, Nathan Hilker
ATMOSPHERIC ENVIRONMENT
(2019)
Article
Environmental Sciences
Cheol-Heon Jeong, Alison Traub, Angela Huang, Nathan Hilker, Jonathan M. Wang, Dennis Herod, Ewa Dabek-Zlotorzynska, Valbona Celo, Greg J. Evans
ENVIRONMENTAL POLLUTION
(2020)
Article
Environmental Sciences
Cheol-Heon Jeong, Meguel Yousif, Greg J. Evans
Summary: Lockdown measures due to COVID-19 substantially affected air quality in many cities, with a 58% reduction in traffic volume but only a 4% decrease in PM2.5 relative to baselines. Major chemical components of PM2.5 showed seasonal changes, and reductions were observed in cooking emissions and non-tailpipe emissions. Tailpipe emissions dropped by approximately 54% and were associated with a reduced number of trucks.
ENVIRONMENTAL POLLUTION
(2022)
Article
Meteorology & Atmospheric Sciences
Nathan Hilker, Jonathan M. Wang, Cheol-Heon Jeong, Robert M. Healy, Uwayemi Sofowote, Jerzy Debosz, Yushan Su, Michael Noble, Anthony Munoz, Geoff Doerksen, Luc White, Celine Audette, Dennis Herod, Jeffrey R. Brook, Greg J. Evans
ATMOSPHERIC MEASUREMENT TECHNIQUES
(2019)