Article
Chemistry, Multidisciplinary
Vinzent Olszok, Malte Bierwirth, Alfred P. Weber
Summary: This study investigates the relationship between nanoparticle morphology and gas interactions in aerosol processes, demonstrating structural changes in platinum particles when exposed to hydrogen gas. The results show differences in particle morphology under different atmospheres, highlighting the significance for understanding agglomerate formation in aerosol processes.
Article
Engineering, Chemical
Jie Luo, Qixing Zhang, Chenchong Zhang, Yongming Zhang, Rajan K. Chakrabarty
Summary: The study found that the ideal fractal law can only fit the coated soot particles when the gyration radius of the coated soot is the same as that of the core. Results also show that the fractal parameters of coated soot at different size scales can vary, and the effective fractal dimension may increase for unevenly coated soot.
JOURNAL OF AEROSOL SCIENCE
(2021)
Article
Chemistry, Physical
Bhanu Priya, Priya Jasrotia, Indra Sulania, Raj Kumar, Jyoti, Ratnesh K. Pandey, Tanuj Kumar
Summary: The wettability of the surface of an active material affects its interaction with the electrolyte and electrode in electrochemical applications. This study evaluated the wettability of V2O5 by examining its surface properties. V2O5 thin films were grown on different substrates after N+ ion implantation, and the growth dynamics were analyzed in terms of surface morphology and fractal parameters. The results showed that the surface morphology and wettability of V2O5 are substrate-dependent and can be controlled using fractal parameters.
APPLIED SURFACE SCIENCE
(2023)
Article
Engineering, Chemical
Hendrix Abdul Ajiz, Kenny Santoso, Jason Aditya Purnama, Widiyastuti Widiyastuti, Tantular Nurtono, Heru Setyawan
Summary: The photoluminescence characteristics of ZnO/SiO2 composite particles were investigated by using the consecutive sol-gel spray drying method. The addition of sodium lauryl sulfate (SLS) as a particle morphology control agent could reduce the particle diameter and increase the particle uniformity. Increasing the excitation wavelength and adding silica to the composite particles could enhance the photoluminescence emission intensity without causing a shift in the emission peaks.
ADVANCED POWDER TECHNOLOGY
(2023)
Article
Engineering, Multidisciplinary
Ke Gui, Huizheng Che, Lei Li, Yu Zheng, Lei Zhang, Hujia Zhao, Junting Zhong, Wenrui Yao, Yuanxin Liang, Yaqiang Wang, Xiaoye Zhang
Summary: This study investigates the optical and microphysical properties of aerosols over land using data from the Multi-angle Imaging SpectroRadiometer. The results show that small-sized and spherical aerosols composed of sulfate, organic matter, and black carbon play a dominant role in determining the interannual variability in land total aerosol optical depth.
Article
Geochemistry & Geophysics
E. Schaefer, C. W. Hamilton, C. D. Neish, M. M. Sori, A. M. Bramson, S. P. Beard
Summary: The study evaluates the use of fractal analysis for classifying lava flows, finding that the current framework's assumptions are invalid at meter scales. A new framework is proposed to leverage the potential of the underlying fractal technique while acknowledging these complexities.
JOURNAL OF GEOPHYSICAL RESEARCH-SOLID EARTH
(2021)
Article
Environmental Sciences
Vojislav Mitic, Cristina Serpa, Ivana Ilic, Markus Mohr, Hans-Jorg Fecht
Summary: Materials science plays a crucial role in space exploration and energy production, particularly in designing, improving, and predicting advanced material properties. This study utilized fractal analysis techniques to analyze microstructures of samples solidified in space and on Earth, establishing new frontiers in advanced structure prediction.
Article
Thermodynamics
Jiawen Cai, Zhaoyang Yu, Shengqiang Yang, Jingxia Tang, Zhenqian Ma, Xionggang Xie, Xincheng Hu
Summary: Pore structure and surface morphology are important factors in coal spontaneous combustion, but little research has quantitatively described them. In this study, the evolution of the surface physical structure of different metamorphic coal during low-temperature oxidation was investigated using specific surface area analyzer and atomic force microscopy. The results showed that the average pore size of coal decreased with increasing temperature, particularly for low-metamorphic coal. On the other hand, the specific surface area increased gradually with temperature, especially for lignite. The surface morphology changed from fluctuation to a flat surface with fewer high peaks as the temperature increased, and the fractal dimension also increased, indicating a more complex pore structure and surface morphology during coal oxidation, particularly for lignite. The effect of coal surface structure on oxidizability was explained by pore connectivity and oxygen adsorption on the surface during the coal oxygen compound reaction.
Article
Engineering, Chemical
Hongyuan Qi, Juan Hu, Yiyi Ju, Huayi Jiang, Mei Liu
Summary: This study comprehensively and quantitatively describes the surface morphology of X80 steel with hydrophilic underwater oleophobic characteristic by combining fractal dimension and multifractal. A chemical etching method was used to construct X80 steel with hydrophilic underwater oleophobic surface properties. The relationship between the surface fractal dimension of X80 and the stability of the water ring in the core annular flow was investigated using contact angle, rolling angle, and adhesion work as wettability parameters.
Article
Mathematics, Interdisciplinary Applications
Erveton Pinheiro Pinto, Robert S. S. Matos, Marcelo A. A. Pires, Lucas dos Santos Lima, Stefan Talu, Henrique Duarte da Fonseca Filho, Shikhgasan Ramazanov, Shahram Solaymani, Claudio Larosa
Summary: In this study, morphological, fractal, and multifractal analysis were used to differentiate surface patterns on zirconia-based ceramics after laser treatments. Two new approaches, the Moran correlogram and the Otsu binarization algorithm, were introduced for ceramic surface analysis. The results showed that laser treatments significantly affected the surface features of the zirconia disc and reduced its isotropy. Moran's correlograms revealed a decrease in short-range correlation, while Minkowski functionals indicated a reduction in the amount of matter in the peaks. The estimated fractal dimension suggested a decrease in surface complexity, and multifractal behavior was detected in all samples, with the highest degree in the CO2 laser treated samples.
FRACTAL AND FRACTIONAL
(2023)
Article
Mathematics, Interdisciplinary Applications
Rou Chen, Ying Zhou, Weiwei Yan, Hua Li
Summary: Due to the high mortality rate of lung cancer patients, there is a critical demand for early-stage diagnostic/monitoring techniques. This study explores a new diagnostic technique using aerosol fingerprints in the breath test based on computational fluid dynamics (CFD) modeling and fractal analysis. The results show that the coupled CFD modeling and fractal analysis method is reliable for quantifying and differentiating exhaled aerosol patterns. The abnormal respiration and location of lung cancer can be judged by analyzing the aerosol fingerprints and fractal dimensions.
FRACTALS-COMPLEX GEOMETRY PATTERNS AND SCALING IN NATURE AND SOCIETY
(2023)
Article
Chemistry, Multidisciplinary
Yonny Romaguera-Barcelay, Stefan Talu, Robert Saraiva Matos, Rosane Maria Pessoa Betanio Oliveira, Joaquim Agostinho Moreira, Javier Perez de Cruz, Henrique Duarte da Fonseca Filho
Summary: The study focuses on the stereometric and fractal analysis of GaMnO3 thin films to understand the correlation between physical parameters and spatial patterns. Results show that sintering temperature greatly influences the structure and topography of the films. The combination of stereometric and fractal measurements can be useful in optimizing the fabrication process.
APPLIED SCIENCES-BASEL
(2021)
Article
Engineering, Multidisciplinary
William Silva da Conceicao, Robert Saraiva Matos, Lina Bufalino, Glenda Quaresma Ramos, Fidel Guereiro Zayas, Henrique Duarte da Fonseca Filho
Summary: The study utilized AFM images, mathematical tools, and advanced fractal parameters to analyze the microtexture of Dinizia excelsa Ducke wood surfaces. Various surface characteristics, including fractal dimensions, succolarity, lacunarity, and entropy, were investigated. The results indicated that different wood surfaces exhibit unique morphologies and roughness, while maintaining similar microtextures and topographic uniformity.
Article
Engineering, Mechanical
Abir Abdessalem, Sahbi Tamboura, Joseph Fitoussi, Hachmi Ben Daly, Abbas Tcharkhtchi, Fodil Meraghni
Summary: This study investigated the effects of hydrothermal aging on Sheet Molding Compound (SMC) composite through X-ray micro computed tomography and microscopic study techniques. The results showed that damage increases continuously with time and temperature, primarily located in voids within the matrix and at fiber interfaces.
ENGINEERING FAILURE ANALYSIS
(2021)
Article
Engineering, Chemical
Xin Jiang, Baojiang Sun, Zhiyuan Wang, Wantian Zhou, Jiakai Ji, Litao Chen
Summary: The growth of hydrate crystals on the surface of methane bubble in pure water was studied using a high-pressure visible microscope. It was found that the hydrate film is porous and the crystal morphology and growth rate are affected by subcooling and methane concentration difference.
CHINESE JOURNAL OF CHEMICAL ENGINEERING
(2022)
Article
Engineering, Environmental
Rongjie Zhang, Hong-Bin Xie, Fangfang Ma, Jingwen Chen, Siddharth Iyer, Mario Simon, Martin Heinritzi, Jiali Shen, Yee Jun Tham, Theo Kurten, Douglas R. Worsnop, Jasper Kirkby, Joachim Curtius, Mikko Sipila, Markku Kulmala, Xu-Cheng He
Summary: Nucleation of neutral iodine particles involves iodic acid (HIO3) and iodous acid (HIO2). The role of HIO2 in iodine oxoacid nucleation is still unclear. This study investigates the role of HIO2 in cluster formation mechanisms and kinetics and finds that HIO2 binds more strongly with HIO3 and HIO2. Mixed HIO3-HIO2 clusters have the fastest nucleation rate. The study suggests that HIO2 could facilitate the nucleation of other acids in regions with scarce base vapors.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Engineering, Environmental
Arthur J. Sedlacek III, Ernie R. Lewis, Timothy B. Onasch, Paquita Zuidema, Jens Redemann, Daniel Jaffe, Lawrence I. Kleinman
Summary: The lifecycle of black carbon (BC)-containing particles from biomass burns is primarily influenced by changes in particle coating, with the coating mass increasing rapidly, then remaining relatively constant for a period before slowly decreasing. The initial increase in coating mass can be used to determine the formation rates of secondary organic aerosol (SOA).
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Engineering, Environmental
Mihnea Surdu, Houssni Lamkaddam, Dongyu S. Wang, David M. Bell, Mao Xiao, Chuan Ping Lee, Dandan Li, Lucia Caudillo, Guillaume Marie, Wiebke Scholz, Mingyi Wang, Brandon Lopez, Ana A. . Piedehierro, Farnoush Ataei, Rima Baalbaki, Barbara Bertozzi, Pia Bogert, Zoe Brasseur, Lubna Dada, Jonathan Duplissy, Henning Finkenzeller, Xu-Cheng He, Kristina Hohler, Kimmo Korhonen, Jordan E. Krechmer, Katrianne Lehtipalo, Naser G. A. . Mahfouz, Hanna E. Manninen, Ruby Marten, Dario Massabo, Roy Mauldin, Tuukka Petaja, Joschka Pfeifer, Maxim Philippov, Birte Rorup, Mario Simon, Jiali Shen, Nsikanabasi Silas Umo, Franziska Vogel, Stefan K. . Weber, Marcel Zauner-Wieczorek, Rainer Volkamer, Harald Saathoff, Ottmar Moehler, Jasper Kirkby, Douglas R. Worsnop, Markku Kulmala, Frank Stratmann, Armin Hansel, Joachim Curtius, Andre Welti, Matthieu Riva, Neil M. Donahue, Urs Baltensperger, Imad El Haddad
Summary: This study investigates the effect of high relative humidity (RH) on the gas-particle partitioning of biogenic oxidized organic molecules at low temperatures. The results demonstrate that high RH increases the partitioning of semivolatile compounds and leads to a shift in the chemical composition and volatility distribution of organic aerosols towards less oxygenated and more volatile species.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Chemistry, Multidisciplinary
Henning Finkenzeller, Siddharth Iyer, Xu-Cheng He, Mario Simon, Theodore K. Koenig, Christopher F. Lee, Rashid Valiev, Victoria Hofbauer, Antonio Amorim, Rima Baalbaki, Andrea Baccarini, Lisa Beck, David M. Bell, Lucia Caudillo, Dexian Chen, Randall Chiu, Biwu Chu, Lubna Dada, Jonathan Duplissy, Martin Heinritzi, Deniz Kemppainen, Changhyuk Kim, Jordan Krechmer, Andreas Kurten, Alexandr Kvashnin, Houssni Lamkaddam, Chuan Ping Lee, Katrianne Lehtipalo, Zijun Li, Vladimir Makhmutov, Hanna E. Manninen, Guillaume Marie, Ruby Marten, Roy L. Mauldin, Bernhard Mentler, Tatjana Muller, Tuukka Petaja, Maxim Philippov, Ananth Ranjithkumar, Birte Rorup, Jiali Shen, Dominik Stolzenburg, Christian Tauber, Yee Jun Tham, Antonio Tome, Miguel Vazquez-Pufleau, Andrea C. Wagner, Dongyu S. Wang, Mingyi Wang, Yonghong Wang, Stefan K. Weber, Wei Nie, Yusheng Wu, Mao Xiao, Qing Ye, Marcel Zauner-Wieczorek, Armin Hansel, Urs Baltensperger, Jerome Brioude, Joachim Curtius, Neil M. Donahue, Imad El Haddad, Richard C. Flagan, Markku Kulmala, Jasper Kirkby, Mikko Sipila, Douglas R. Worsnop, Theo Kurten, Matti Rissanen, Rainer Volkamer
Summary: Iodine is an active trace element in atmospheric chemistry that can destroy ozone and form particles. Its emissions have increased threefold since 1950 and are expected to continue rising. In laboratory experiments, iodooxy hypoiodite (IOIO) was shown to efficiently convert into iodic acid (HIO3) via reactions IOIO + O-3 -> IOIO4 and IOIO4 + H2O -> HIO3 + HOI + O-(1)(2). This laboratory-derived mechanism explains field observations of daytime HIO3 in the remote lower free troposphere and suggests a catalytic role of iodine in aerosol formation.
Article
Environmental Sciences
Roberto Casotto, Alicja Skiba, Martin Rauber, Jan Strahl, Anna Tobler, Deepika Bhattu, Houssni Lamkaddam, Manousos Manousakas, Gary Salazar, Tianqu Cui, Francesco Canonaco, Lucyna Samek, Anna Rys, Imad El Haddad, Anne Kasper-Giebl, Urs Baltensperger, Jaroslaw Necki, Sonke Szidat, Katarzyna Styszko, Jay G. Slowik, Andre S. H. Prevot, Kaspar R. Daellenbach
Summary: Krakow is a pollution hot-spot in Europe, mainly due to the high use of coal combustion. The study found that secondary organic aerosol (SOA) from residential heating was the main contributor to winter organic aerosol (OA), composed of both fossil and non-fossil emissions. Additionally, fresh solid fuel combustion from residential heating also contributed to OA during winter. In contrast, spring and summer had more soluble organic carbon, mainly from biogenic sources. These findings provide information for evaluating the success of efforts to improve air quality in Krakow.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Meteorology & Atmospheric Sciences
Mohammad R. Sadrian, Wendy M. Calvin, Johann P. Engelbrecht, Hans Moosmuller
Summary: We investigated the mineralogy of global surface soils, which are likely similar to atmospheric dust aerosols, using reflectance and transmission measurements in visible, shortwave, and longwave infrared regions. Spectroscopy proved to be complementary to other techniques and exhibited better identification of specific minerals in these samples. Our findings can contribute to the enhancement of global soil atlases and the interpretation of data obtained from remote sensing instruments.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2023)
Article
Engineering, Chemical
Kurt Ehlers, Hans Moosmueller
Summary: The aerosol single scattering asymmetry parameter g is an important particle parameter that determines aerosol direct radiative forcing and radiation pressure. The value of g depends on the size parameter x, the complex refractive index m, and the particle's shape. In the small particle regime, g is proportional to x^2 and the proportionality factor depends on the complex refractive index m. In the large particle regime, g converges to a constant value that is determined by the particle's refractive index.
AEROSOL SCIENCE AND TECHNOLOGY
(2023)
Article
Engineering, Environmental
Penggang Zheng, Yi Chen, Zhe Wang, Yuliang Liu, Wei Pu, Chuan Yu, Men Xia, Yang Xu, Jia Guo, Yishuo Guo, Linhui Tian, Xiaohui Qiao, Dan Dan Huang, Chao Yan, Wei Nie, Douglas R. Worsnop, Shuncheng Lee, Tao Wang
Summary: This study conducted ambient measurements of OOMs at a regional background site in South China. It revealed that nitrogen-containing products were dominant, and different factors influenced the composition and oxidation state of OOMs. The results demonstrated the significant role of OOMs in sub-100 nm particle growth and SOA formation.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Environmental Sciences
Mohammad R. Sadrian, Wendy M. Calvin, Andrew E. Perrin, Johann P. Engelbrecht, Hans Moosmueller
Summary: This study explores the spectral diversity of infrared (IR) imaginary (k) and real (n) indices of refraction for soils from global dust entrainment regions. The optical constants obtained through the KBr technique are comparable to previous studies, suggesting the reliability of the SKK method. The spectral variability observed in these soils is attributed to combinations of silicates rather than a single mineral.
Article
Environmental Sciences
Marshall Liddle, Hans Moosmuller, John Lewis
Summary: This study estimated the predictability limits for the Rex block by using 38 years of reanalysis data and associated 90-day winters. The unique aspect of this research lies in determining the predictability limits as a function of geopotential wave structure found through Fourier decomposition.
Article
Ecology
Vera Samburova, Eric Schneider, Christopher P. Rueger, Shelby Inouye, Brad Sion, Kevin Axelrod, Palina Bahdanovich, Lukas Friederici, Yasaman Raeofy, Markus Berli, Alexandra Lutz, Ralf Zimmermann, Hans Moosmueller
Summary: In the past decade, wildfires in the western USA, particularly recent megafires in California, have increased in number, size, and intensity. These wildfires have led to changes in soil chemical composition, resulting in an increase in soil water repellency. Field tests have shown a significant increase in water drop penetration time (WDPT) in post-fire soils. Chemical analysis of burned soils revealed an increase in hydrophobic organics and a correlation between certain chemical ratios and soil water repellency. These changes in soil water repellency can trigger hydrological effects such as landslides, flooding, and debris flows.
Article
Environmental Sciences
Lucia Caudillo, Mihnea Surdu, Brandon Lopez, Mingyi Wang, Markus Thoma, Steffen Brakling, Angela Buchholz, Mario Simon, Andrea C. Wagner, Tatjana Mueller, Manuel Granzin, Martin Heinritzi, Antonio Amorim, David M. Bell, Zoe Brasseur, Lubna Dada, Jonathan Duplissy, Henning Finkenzeller, Xu-Cheng He, Houssni Lamkaddam, Naser G. A. Mahfouz, Vladimir Makhmutov, Hanna E. Manninen, Guillaume Marie, Ruby Marten, Roy L. Mauldin, Bernhard Mentler, Antti Onnela, Tuukka Petaja, Joschka Pfeifer, Maxim Philippov, Ana A. Piedehierro, Birte Rorup, Wiebke Scholz, Jiali Shen, Dominik Stolzenburg, Christian Tauber, Ping Tian, Antonio Tome, Nsikanabasi Silas Umo, Dongyu S. Wang, Yonghong Wang, Stefan K. Weber, Andre Welti, Marcel Zauner-Wieczorek, Urs Baltensperger, Richard C. Flagan, Armin Hansel, Jasper Kirkby, Markku Kulmala, Katrianne Lehtipalo, Douglas R. Worsnop, Imad El Haddad, Neil M. Donahue, Alexander L. Vogel, Andreas Kuerten, Joachim Curtius
Summary: The complete chemical characterization of nanoparticles is challenging due to their abundance but negligible mass. This study compares different techniques for the chemical composition analysis of secondary organic aerosol nanoparticles. The experiments were conducted at the CLOUD chamber, and simultaneous measurements were performed using four different techniques. The results generally agree on the important compounds found in the nanoparticles, but each technique captures different parts of the organic spectrum, potentially due to factors such as thermal decomposition or sampling artifacts.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2023)
Article
Environmental Sciences
Daniel John Katz, Aroob Abdelhamid, Harald Stark, Manjula R. Canagaratna, Douglas R. Worsnop, Eleanor C. Browne
Summary: Measurements of ambient ion chemical composition provide direct insight into the most acidic and basic trace gases and their ion-molecule clusters. The use of the atmospheric pressure interface time-of-flight mass spectrometer (APi-ToF) combined with binPMF analysis allows for the temporal evolution of compounds important for new particle formation and growth to be studied. The results showed that negative ions consist of strong acids, organosulfates, and clusters derived from monoterpene and sesquiterpene oxidation, while positive ions consist of alkyl pyridines and amines.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2023)
Article
Environmental Sciences
Jian Zhao, Ella Hakkinen, Frans Graeffe, Jordan E. Krechmer, Manjula R. Canagaratna, Douglas R. Worsnop, Juha Kangasluoma, Mikael Ehn
Summary: Highly oxygenated organic molecules (HOMs) are crucial for the formation of secondary organic aerosol (SOA), but the lack of suitable analytical techniques has limited our understanding of particle-phase HOM speciation and its relationship with gas-phase HOM formation. This study used a novel VIA-NO3-CIMS system to investigate the gas- and particle-phase HOM products of a-pinene ozonolysis. The results showed that gas-phase dimer formation was suppressed with the addition of CO or NO, but particle-phase dimers still constituted a considerable fraction of the observed SOA. Overall, the VIA-NO3-CIMS system showed promise for combined online gas- and particle-phase HOM measurements.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2023)
Article
Environmental Sciences
David M. Bell, Veronika Pospisilova, Felipe Lopez-Hilfiker, Amelie Bertrand, Mao Xiao, Xueqin Zhou, Wei Huang, Dongyu S. Wang, Chuan Ping Lee, Josef Dommen, Urs Baltensperger, Andre S. H. Prevot, Imad El Haddad, Jay G. Slowik
Summary: This study provides a detailed molecular characterization of secondary organic aerosol (SOA) produced with different OH scavengers. The use of OH scavengers has significant effects on the composition of SOA, including inclusions of scavenger molecules in SOA, the promotion of fragmentation reactions, and depletion of dimers formed via RO2-RO2 reactions.
ENVIRONMENTAL SCIENCE-ATMOSPHERES
(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
Engineering, Chemical
Brijal Prajapati, Vishal Dharaiya, Manoranjan Sahu, Chandra Venkatraman, Pratim Biswas, Kajal Yadav, Delwin Pullokaran, Ramya Sunder Raman, Ruqia Bhat, Tanveer Ahmad Najar, Arshid Jehangir
Summary: This study evaluated the performance of a low-cost particulate matter sensor and proposed a physics-based calibration method. The results showed that the physics-based calibration approach performed better compared to statistical models at both observation sites.
JOURNAL OF AEROSOL SCIENCE
(2024)
Correction
Engineering, Chemical
N. Searle, K. Kaur, K. Kelly
JOURNAL OF AEROSOL SCIENCE
(2024)
Article
Engineering, Chemical
Tianyu Cen, Laura Torrent, Andrea Testino, Christian Ludwig
Summary: In this study, a hyphenated setup consisting of a rotating disk diluter (RDD) with spICP-MS (RDDspICP-MS) was used for online sampling and characterization of metallic nanoparticles (NPs) in ambient pressure aerosols. The RDD allowed for constant flow rate sampling of aerosols and adjusting the dilution ratio for different particle number concentrations (PNCs). The feasibility of this setup was tested with different sizes of AuNPs in argon-based and air-based aerosols, and the results showed a lower limit of detection for number concentration. The capability of the setup to accurately investigate multi-modal samples and the interference of ionic species was also demonstrated.
JOURNAL OF AEROSOL SCIENCE
(2024)
Article
Engineering, Chemical
A. Valenzuela, E. Bazo, R. A. Rica, L. Alados-Arboledas, F. J. Olmo-Reyes
Summary: This article introduces a method to measure the extinction cross section of levitated particles using an electrodynamic trap and double-cavity ring down spectroscopy technique, and demonstrates the potential of this method in 1,2,6-hexanetriol particles through simulations and experiments. Unlike traditional methods, this technique provides crucial information about the extinction cross section of sodium chloride particles during dehydration and hydration processes.
JOURNAL OF AEROSOL SCIENCE
(2024)
Article
Engineering, Chemical
Shadi Yaqoubi, Mohaddese Sokuti, Sahand Mazloum-Ravasan, Kofi Asare-Addo, Hamed Hamishehkar, Ali Nokhodchi
Summary: In this study, a modified version of ultrasonic spray pyrolysis was used to prepare salbutamol sulfate dry powder. The engineered particles showed suitable characteristics for effective drug delivery to the lungs and demonstrated acceptable aerosolization performance. This newly introduced method appears to be capable of producing dry powder formulations of different drugs without the need for surfactants or stabilizers.
JOURNAL OF AEROSOL SCIENCE
(2024)
Article
Engineering, Chemical
Ashley L. Nord, Patrice Dosset, Pierre Slangen, Manouk Abkarian
Summary: Phonation has been found to be a potent transmission route for the COVID-19 virus. To control transmission, it is important to measure the amount of aerosols produced by speech. Researchers used digital in-line holography to overcome experimental challenges and successfully imaged the formation and deformation of saliva filaments in the mouth during speech, as well as the resulting aerosolized droplets.
JOURNAL OF AEROSOL SCIENCE
(2024)
Article
Engineering, Chemical
Yating Wang, Yiyang Zhang, Zhu Fang, Xinxin Wu
Summary: The research investigates the energy dissipation in particle-wall collision with roughness using the finite element method. The results show that the presence of surface roughness leads to lower viscoelastic dissipation and higher restitution coefficient compared to a smooth surface. The collision time is identified as a key factor in predicting the energy dissipation.
JOURNAL OF AEROSOL SCIENCE
(2024)
Article
Engineering, Chemical
Shaamrit Balendra, Akshay Kale, Julie Pongetti, Mohsen Kazemimanesh, Molly Haugen, Lee Weller, Adam Boies
Summary: The measurement of airborne particles is important for detecting and characterising air pollution, emissions, fire detection, occupational and climate impacts. However, current optical particle counters (OPCs) cannot measure ultrafine particles. This study explores the limitations of miniaturising a condensation particle counter (CPC) growth chamber and provides a toolkit for optimising the design of miniaturised CPC-GCs.
JOURNAL OF AEROSOL SCIENCE
(2024)
Article
Engineering, Chemical
Markus Snellman, Namsoon Eom, Maria E. Messing, Knut Deppert, Chris Hogan
Summary: Segregated bimetallic nanoparticles, such as core-shell nanoparticles, have attracted widespread interest in various fields like biomedicine, catalysis, and optoelectronics. Aerosol technology provides an optimal platform for controlling the size, structure, and composition of nanoparticles, which are crucial parameters for tuning the material performance for specific applications. In this study, researchers developed a novel evaporator design that allows on-line coating of core particles with a shell directly in the gas phase. By utilizing a local heater, the researchers were able to decouple the heating process of the evaporating material from the aerosol particles, thereby limiting core-shell alloying. The resulting core-shell particle formation with controllable shell thickness was demonstrated using evaporation of zinc onto core particles of gold, tin, and bismuth. Simple models were also discussed to explain the observed growth process inside the evaporator and the formation of the shell.
JOURNAL OF AEROSOL SCIENCE
(2024)
Article
Engineering, Chemical
Kentaro Misawa, Yuto Kasai
Summary: In this study, the laser-induced fluorescence technique was used to observe scattered and fluorescent signals from fluorescent polystyrene latex particles. The ratio of fluorescence to scattered signal intensities was found to be almost equal for particles of the same size, allowing for the separate observation of mixed-size fluorescent particles. Relative fluorescence intensities were obtained by incorporating ratios of fluorescence to scattered signal and relative scattered signal intensities.
JOURNAL OF AEROSOL SCIENCE
(2024)
Article
Engineering, Chemical
Sripriya Nannu Shankar, William B. Vass, John A. Lednicky, Tracey Logan, Rebeccah L. Messcher, Arantzazu Eiguren-Fernandez, Stavros Amanatidis, Tara Sabo-Attwood, Chang-Yu Wu
Summary: This study introduces a testing system that allows for direct exposure of aerosolized viruses onto host cells. By collecting particles of different sizes and analyzing them, researchers obtained information on the concentration and viability of the virus at different particle sizes.
JOURNAL OF AEROSOL SCIENCE
(2024)
