Article
Optics
Jin Zeng, Ang Bian, Ang Chen, Wenbo Xu, Wenqing Cheng, Shu Yan, Shu Wang, Tian Deng
Summary: A new optical aerosol sensing method based on light-scattering angular spectrum (LSAS) is introduced in this study, which provides high-resolution and accurate measurement of particle size distribution (PSD). With a compact LSAS sampling module and non-negative regularization inversion algorithm, high-resolution PSD is predicted. The performance of our sensor is validated through tests on monodisperse aerosol samples and smoldering smoke.
OPTICS AND LASERS IN ENGINEERING
(2023)
Article
Engineering, Chemical
Adrian Roth, David Frantz, Mehdi Stiti, Edouard Berrocal
Summary: The COVID-19 pandemic has highlighted the lack of understanding regarding the airborne transmission pathway of diseases. This study presents a new method using high-speed scattered light imaging to measure the size of liquid particles (droplets) in respiratory events, providing valuable data to improve the understanding of airborne transmission pathway.
JOURNAL OF AEROSOL SCIENCE
(2023)
Article
Engineering, Chemical
W. F. Camargo, P. Q. Mantas, A. M. Segadaes, R. C. D. Cruz
Summary: A sub-micron quartz powder was used to explore the information contained in the particle size distribution curves obtained by electro-acoustic spectroscopy and dynamic light scattering. Area and number-based representations were found to be more sensitive to the presence of finer particles, supporting the use of complementary techniques for a reliable description of powder particle size.
Article
Optics
Andrey Romanov, Maxim A. Yurkin
Summary: This study provides a rigorous theoretical justification for the measurement of particle size using the Fourier spectrum of its angle-resolved light-scattering pattern (LSP). The results show that the LSP spectrum accurately reflects the particle diameter, and the measurement method is applicable in various approximation scenarios.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Acoustics
Kana Kitao, Tomohisa Norisuye
Summary: In this study, high-speed and high-precision nanoparticle measurement was achieved by using a high-energy focused transducer, a high-frequency sensor enhancing scattering performance, and a short pulse repetition time. By observing diffusive motion, the motion of nanoparticles could be directly tracked and particle size analysis could be conducted.
Review
Optics
Andrey Romanov, Maxim A. Yurkin
Summary: The field of light-scattering characterization of single particles has grown rapidly in the past 30 years due to advancements in measurement and simulation capabilities. Various methods have been developed to characterize particles with high geometric resolution, but development has been fragmented and specific to experimental setups. Existing methods are categorized into model-driven, model-free, and data-driven methods, with a focus on algorithms and experimental aspects.
LASER & PHOTONICS REVIEWS
(2021)
Article
Optics
Fabio J. W. A. Martins, Andreas Kronenburg, Frank Beyrau
Summary: The study extended the two-dimensional multi-angle light scattering technique for single-shot size measurements of soot aggregates in flames, demonstrating its applicability to weakly unsteady combustion processes.
APPLIED PHYSICS B-LASERS AND OPTICS
(2021)
Article
Engineering, Multidisciplinary
Ang Chen, Shu Wang, Xiaoyi Jiang, Shu Yan, Ang Bian, Wenbo Xu, Jin Zeng, Tian Deng
Summary: This study introduced a new method for aerosol sizing using light scattering intensity field and deep learning, which can measure particle size distribution effectively even without prior knowledge of refractive index. The experiment results demonstrated the high accuracy and efficiency of this method in particle size measurement.
Article
Chemistry, Analytical
Yi-Yan Bai, Zhi-Tao Feng, Yan-Ju Yang, Xiao-Yan Yang, Zhi-Ling Zhang
Summary: This study utilized current lifetime as a dynamic parameter to distinguish differently sized nanoparticles successfully. By considering current lifetime instead of current intensity, more accurate evaluation of nanoparticle sizes can be achieved.
ANALYTICAL CHEMISTRY
(2022)
Article
Engineering, Chemical
Tomonari Misawa, Yoshiki Yonamoto
Summary: Particle-processing industries require accurate and reliable monitoring techniques for particle-size distribution. An imaging-based monitoring system is proposed to extend the detectable particle size range towards the submicron level by combining particle-shade and scattered-light imaging. The system consists of newly developed optics and an analysis algorithm.
Article
Optics
Saowaros Dawprateep, Joewono Widjaja
Summary: This study proposes a method for measuring the size of rod-shaped particles from inline holograms using Wigner-Ville distribution (WVD) coefficients. The method eliminates the need for iterative and time-consuming particle depth searches, providing a faster response and higher sizing accuracy compared to conventional numerical reconstructions. The proposed method is experimentally validated using microtube objects of varying diameters.
OPTICS AND LASERS IN ENGINEERING
(2021)
Article
Optics
Yan Han, Lei Ding, Yingping Wang, Haiyang Zheng, Li Fang
Summary: By combining the polarized light illuminated scattering characteristics of single airborne particle with aerodynamic size information, we demonstrated a new method for rapidly distinguishing different shapes of aerosol particles. The results show that the method can effectively differentiate spherical and elongated particles within a certain range.
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2021)
Article
Chemistry, Physical
Jaeran Lee, Ji Won Ha
Summary: This study investigated the hot electron-mediated photoreduction of silver ions on gold nanorods under white light irradiation without a reducing agent, leading to the formation of core@shell structures. The deposition of silver on the nanorods resulted in increased scattering intensity and blue shifted localized surface plasmon resonance peak. The study also explored the effect of different light-on/off cycle conditions and silver nitrate concentration on the spectral changes.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Nanoscience & Nanotechnology
Hankyul Lee, Hyung Jun Park, Gyu Jin Yeon, Zee Hwan Kim
Summary: In this study, a method to fully recover the scattering amplitude and phase from iSCAT is reported. By scanning the objective lens vertically along the z-axis, interference between scattered light and reflected light is achieved, providing highly accurate scattering amplitude and phase. This method can be used for spectral analysis of single nanoparticles and extraction of parameters of plasmon resonance.
Article
Chemistry, Analytical
Dan Chicea, Aleksandr S. Doroshkevich, Andriy Lyubchyk
Summary: This paper presents an alternative approach for processing Dynamic Light Scattering (DLS) time series using spectral entropy computation and Artificial Neural Networks. The proposed method was evaluated through error analysis and results on simulated and experimental DLS time series are provided. The findings demonstrate the potential of designing an advanced sensor capable of detecting particles larger than a certain threshold using this alternative approach for DLS time series processing.
Correction
Optics
Nobuhiro Moteki
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2021)
Article
Optics
Nobuhiro Moteki
Summary: This study presents a theoretical and experimental basis for measuring the complex forward-scattering amplitude of single particles through self-reference interferometry. The proposed CAS-v1 protocol aims to utilize self-reference interferometry effectively for inline measurements of single sub- and super-micron particles, facilitating real-time particle measurements in various scientific fields.
Article
Ecology
M. Koike, K. Goto-Azuma, Y. Kondo, H. Matsui, T. Mori, N. Moteki, S. Ohata, H. Okamoto, N. Oshima, K. Sato, T. Takano, Y. Tobo, J. Ukita, A. Yoshida
Summary: This paper reviews studies of aerosols and clouds performed during the Arctic Challenge for Sustainability (ArCS) project carried out by the National Institute of Polar Research (NIPR) in Japan and collaborating institutions. The research focused on black carbon aerosols, ice nucleating particles, and cloud measurements, emphasizing the importance of accurate measurements and models in understanding the impacts of aerosols and clouds on Arctic climate.
Article
Meteorology & Atmospheric Sciences
Tatsuhiro Mori, Yutaka Kondo, Sho Ohata, Kumiko Goto-Azuma, Kaori Fukuda, Yoshimi Ogawa-Tsukagawa, Nobuhiro Moteki, Atsushi Yoshida, Makoto Koike, P. R. Sinha, Naga Oshima, Hitoshi Matsui, Yutaka Tobo, Masanori Yabuki, Wenche Aas
Summary: The study shows that black carbon aerosols deposited in Arctic snow affect the absorption of solar radiation and snowmelt, with the concentration of black carbon in the atmosphere and snow playing a key role, influenced by wet deposition. Measurements conducted in Ny-angstrom lesund, Svalbard from 2012 to 2019 indicated seasonal variations in black carbon concentrations. Comparisons with observations in Barrow, Alaska revealed similarities in near-surface black carbon concentrations but differences in wet deposition and concentrations in hydrometeors, with implications for understanding black carbon dynamics in the Arctic.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2021)
Article
Engineering, Chemical
Atsushi Yoshida, Nobuhiro Moteki, Kouji Adachi
Summary: Accurate observational data on the size-resolved concentration of mineral dust particles is crucial for studying the impact of dust on climate. However, automated measurements of dust particles are challenging due to their complex physicochemical properties and difficulties in distinguishing dust from other particulate components. This study proposes the use of complex forward-scattering amplitude data obtained by the single particle extinction and scattering method as an optical approach for identifying and quantifying silicate particles, the major component of desert dust.
AEROSOL SCIENCE AND TECHNOLOGY
(2022)
Article
Engineering, Chemical
Tatsuhiro Mori, Yutaka Kondo, Kumiko Goto-Azuma, Nobuhiro Moteki, Atsushi Yoshida, Kaori Fukuda, Yoshimi Ogawa-Tsukagawa, Sho Ohata, Makoto Koike
Summary: In this study, a modified single-particle soot photometer (SP2) and a concentric pneumatic nebulizer were used to measure the size-resolved number and mass concentrations of light-absorbing iron oxide aerosols in liquid water. The accuracy and uncertainty of the measurements were evaluated, and it was found that the system provided high accuracy in measuring the iron oxide particles, which can help improve our understanding of the wet deposition of iron oxide and provide more accurate estimates of its effects on snow surface albedo.
AEROSOL SCIENCE AND TECHNOLOGY
(2022)
Article
Engineering, Chemical
Nobuhiro Moteki, Sho Ohata, Atsushi Yoshida, Kouji Adachi
Summary: Black carbon is a significant contributor to global aerosol's shortwave absorption in the atmosphere, acting as a positive climate forcer. The accurate refractive index of atmospheric black carbon material has been difficult to determine due to its irregularity and variability in shape, size distribution, and mixing with other aerosol compounds. This study presents a method that uses the observed distribution of the complex forward-scattering amplitude to constrain a plausible domain for the refractive index of black carbon. By collecting atmospheric aerosols into water and measuring the single particle forward-scattering amplitude in a water medium, the authors obtain the distribution of the forward-scattering amplitude for black carbon. Using this method, they recommend a refractive index value of 1.95 + 0.96i for uncoated black carbon at visible wavelengths, which is higher than the widely used value in current aerosol-climate models. This suggests that current climate simulations may underestimate the shortwave absorption by black carbon aerosols by approximately 16%.
AEROSOL SCIENCE AND TECHNOLOGY
(2023)
Article
Engineering, Chemical
Sho Ohata, Nobuhiro Moteki, Hikaru Kawanago, Yutaka Tobo, Kouji Adachi, Michihiro Mochida
Summary: A new method for measuring the number concentrations of submicron water-insoluble aerosol particles (WIAPs) was evaluated based on atmospheric aerosol measurements in Nagoya, Japan. This method collects and disperses aerosol particles on a filter and measures the complex forward-scattering amplitudes to characterize their physical properties. WIAPs were classified into black carbon-like, dust-like, and primary biological aerosol particle-like categories. Black carbon-like and dust-like particles were found to dominate the submicron WIAP population, as confirmed by electron microscopy and Wideband Integrated Bioaerosol Sensor observations. The method shows potential for quantifying the spatio-temporal distributions of WIAPs.
AEROSOL SCIENCE AND TECHNOLOGY
(2023)
Correction
Geosciences, Multidisciplinary
Nobuhiro Moteki
PROGRESS IN EARTH AND PLANETARY SCIENCE
(2023)
Review
Geosciences, Multidisciplinary
Nobuhiro Moteki
Summary: Light-absorbing aerosols, especially black carbon, have significant impacts on atmospheric radiation, dynamics, and precipitations. In situ measurements play a crucial role in testing assumptions in climate models and updating remote sensing data. This review article discusses the historical background, recent advances, and observational findings in in situ measurements of black carbon, providing insights into its lifecycle and climate effects.
PROGRESS IN EARTH AND PLANETARY SCIENCE
(2023)
Article
Environmental Sciences
Hitoshi Matsui, Tatsuhiro Mori, Sho Ohata, Nobuhiro Moteki, Naga Oshima, Kumiko Goto-Azuma, Makoto Koike, Yutaka Kondo
Summary: Source contributions of black carbon (BC) in the Arctic vary greatly for different variables, with Siberia contributing the most to near-surface concentration, deposition, and snow radiative effects, Asia contributing the most to vertically integrated concentration and top of the atmosphere radiative effects, and biomass burning sources having varying contributions depending on the season.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2022)
Article
Environmental Sciences
Kouji Adachi, Naga Oshima, Nobuyuki Takegawa, Nobuhiro Moteki, Makoto Koike
Summary: This study provides unique observational evidence for the linkage between extraplanetary materials and tropospheric aerosols. Stratospheric meteorite dust particles can be entrained into the upper troposphere by tropopause folding, where the particles may affect cloud formation, according to electron microscopy of extraplanetary materials found within tropospheric sulfate aerosol particles.
COMMUNICATIONS EARTH & ENVIRONMENT
(2022)
Article
Environmental Sciences
Sho Ohata, Makoto Koike, Atsushi Yoshida, Nobuhiro Moteki, Kouji Adachi, Naga Oshima, Hitoshi Matsui, Oliver Eppers, Heiko Bozem, Marco Zanatta, Andreas B. Herber
Summary: Vertical profiles of black carbon (BC) mass concentration were measured up to 5 km altitude during the 2018 PAMARCMiP aircraft-based field experiment in the Arctic region, showing lower BC concentrations compared to previous observations. Year-to-year variations were attributed to biomass burning activities in northern midlatitudes, with model simulations underestimating BC values in some experiments. These findings suggest biomass burning contributions may have been underestimated in previous studies.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2021)
Article
Meteorology & Atmospheric Sciences
Sho Ohata, Tatsuhiro Mori, Yutaka Kondo, Sangeeta Sharma, Antti Hyvarinen, Elisabeth Andrews, Peter Tunved, Eija Asmi, John Backman, Henri Servomaa, Daniel Veber, Makoto Koike, Yugo Kanaya, Atsushi Yoshida, Nobuhiro Moteki, Yongjing Zhao, Junji Matsushita, Naga Oshima, Konstantinos Eleftheriadis, Stergios Vratolis, Radovan Krejci, Paul Zieger, Yutaka Tobo
Summary: Long-term measurements of atmospheric black carbon (BC) mass concentrations are essential for studying its emission, transport, and deposition. Instruments measuring aerosol absorption coefficient (b(abs)) in the Arctic have shown high correlations with independent BC mass concentrations, leading to the derivation of mass absorption cross section values for accurate estimation of BC mass concentrations.
ATMOSPHERIC MEASUREMENT TECHNIQUES
(2021)
Article
Environmental Sciences
Kouji Adachi, Naga Oshima, Sho Ohata, Atsushi Yoshida, Nobuhiro Moteki, Makoto Koike
Summary: Aerosol particles collected in the Arctic at different altitudes showed variations in composition, size, and sources. Mineral-dust and sea-salt particles decreased in number fraction with increasing altitude, while K-bearing particles increased within a biomass burning plume originating from Siberia. Chlorine in sea-salt particles was replaced with sulfate at high altitudes.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2021)
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)