Article
Chemistry, Multidisciplinary
Anubhav Kumar, Supratim Mondal, Shibdas Banerjee
Summary: The study demonstrates the effective capture and detection of short-lived carbocations using water microdroplets, outperforming organic microdroplets. By utilizing desorption electrospray ionization mass spectrometry, various carbocations obtained from different reactions were analyzed.
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
(2021)
Article
Chemistry, Multidisciplinary
Pallab Basuri, Amrita Chakraborty, Tripti Ahuja, Biswajit Mondal, Jenifer Shantha Kumar, Thalappil Pradeep
Summary: Imprinted charged aqueous droplets of micrometer dimensions containing spherical gold and silver nanoparticles, gold nanorods, proteins and simple molecules were visualized using dark-field and transmission electron microscopies. With such studies, we hoped to understand the unusual chemistry exhibited by microdroplets.
Article
Chemistry, Multidisciplinary
Alexander M. Prophet, Kritanjan Polley, Gary J. Van Berkel, David T. Limmer, Kevin R. Wilson
Summary: The oxidation kinetics of iodide by ozone at the air-water interface is studied in single microdroplets. Molecular simulations and kinetic modeling are used to understand the underlying multiphase mechanism.
Article
Chemistry, Physical
Pyeongeun Kim, Christian Boothby, Vicki H. Grassian, Robert E. Continetti
Summary: Energy transfer mechanisms initiated by light-absorbing organic molecules may play a significant role in the photochemistry of nitrate ions (NO3-) in water.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Chemistry, Physical
Xinbo Jing, Zhe Chen, Xue Cao, Qishen Huang, Pai Liu, Yun-hong Zhang
Summary: Sulfate formation from SO2 during urban haze events in China is a complex process with the important contributions of regionally transported sea spray aerosols (SSAs) and transition-metal ions (TMI)-catalyzed reactions. The reaction kinetics of Mn2+-catalyzed SO2 oxidation in NaCl microdroplets were investigated, revealing a linear correlation between reaction rate and droplet radius. The saturation concentration for both Mn2+ and SO2 implied an upper limit for the SO2 uptake coefficient, which increased with high ionic strength but was constant at pH levels of 5 to 8. The uptake coefficient was significantly higher than that of the uncatalyzed autoxidation of SO2 and other mineral dust oxidation pathways.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Chemistry, Analytical
Mao Fukuyama, Lin Zhou, Tetsuo Okada, Kristina Simonova, Mikhail Proskurnin, Akihide Hibara
Summary: The technique of deterministically enriching substances in droplets by controlling water transport has the potential to be a powerful pretreatment method for bioassays in droplet microfluidics.
ANALYTICA CHIMICA ACTA
(2021)
Article
Chemistry, Physical
Yun Ju, Hong Zhang, Xiaofei Wang, Yaqi Liu, Yali Yang, Guangfeng Kan, Kai Yu, Jie Jiang
Summary: This study reports the abiotic synthesis of lysophosphatidic acids (LPAs) using prebiotically plausible reactants in aqueous microdroplets under ambient conditions. The formation of LPAs occurred near or at the microdroplet surface and showed chemoselectivity towards the chain-length of fatty acids. The results also suggest that pyrophosphate served as both catalyst and precursor in prebiotic LPAs synthesis.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Chemistry, Multidisciplinary
Zuoxuan Gao, Jinghui Yan, Lihong Shi, Xiaohu Liu, Mengtong Wang, Chenyu Li, Zechao Huai, Cheng Wang, Xuan Wang, Lina Zhang, Wenbo Yan
Summary: This study proposes a surfactant-mediated photovoltaic manipulation method for stable and fast manipulation of femtoliter-scale aqueous microdroplets. By adjusting the intensity and position of laser illumination, the merging, touching, and detaching of microdroplets can be controlled. The study also demonstrates cascading biochemical operations and microreactions of microdroplets, as well as in-situ adjustment of droplet size and fluorescent solute.
ADVANCED MATERIALS
(2023)
Article
Chemistry, Analytical
Benjamin J. Burris, Abraham K. Badu-Tawiah
Summary: Enzyme-catalyzed hydrolysis of lipids was monitored directly in immiscible microdroplet environments using contained-electrospray mass spectrometry. Different lipid types were utilized to identify possible mechanisms for lipase reactivity in aerosols, showing enhancement factors favoring the droplet experiment.
ANALYTICAL CHEMISTRY
(2021)
Article
Engineering, Environmental
Alan Y. Gu, Charles Musgrave, William A. Goddard, Michael R. Hoffmann, Agustin J. Colussi
Summary: The study reveals that Fenton chemistry proceeds at a rate approximately 10^4 times faster on aqueous microdroplets than in bulk-phase water. The dominant intermediate under all conditions is found to be (FeO2+)-O-IV. Organic ligands also have an impact on the reaction kinetics.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Article
Chemistry, Analytical
Qian He, Ningxin Zhang, Yifan Qiao, Chenchen Li, Jing Zhang
Summary: Pneumatic nebulization technology allows for the spontaneous conversion of mercury ions into volatile elemental mercury through aqueous microdroplets without the need for added redox agents, electricity, or radiation. This innovative and low-energy method has the potential to contribute to green chemistry and the global atmospheric mercury cycle.
JOURNAL OF ANALYTICAL ATOMIC SPECTROMETRY
(2022)
Article
Chemistry, Multidisciplinary
Jason Kuang, Shan Yan, Lisa M. Housel, Steven N. Ehrlich, Lu Ma, Kenneth J. Takeuchi, Esther S. Takeuchi, Amy C. Marschilok, Lei Wang
Summary: In this study, manganese molybdate (MnMoO4) was utilized as a cathode material for aqueous rechargeable Zn-ion batteries. The impact of different anions (sulfate and chloride) on its performance was investigated. Both manganese and molybdate metal centers were found to be redox active, with preference for different anions and reaction rates. Mn redox was demonstrated to be the more stable mechanism over prolonged cycling.
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
(2022)
Article
Engineering, Chemical
Dong Li, Hedong Zhong, Zhengyao Li, Wanzhong Yin, Jue Kou, Chunbao Sun
Summary: The study investigated the dissolution of siderite and its effects on the interaction with quartz particles using real-time particle characterization tools and theoretical calculations. The results showed that siderite dissolution at pH 5.0 weakened the electrostatic attraction energies between siderite and quartz, resulting in the suppression of hetero-aggregation.
Article
Chemistry, Multidisciplinary
Zhipeng Zheng, Youge Pu, Javier Adrio, Patrick J. Walsh
Summary: This study reports a synthetic method for trans-aziridines using imines and benzylic or alkyl halides with sulfenate anions (PhSO-) as catalysts. The method shows broad applicability and good diastereoselectivity, and can be used with substrates bearing heterocyclic aromatic groups, alkyl, and electron-rich and electron-poor aryl groups. Ring-opening reactions further allow functionalization of aziridines containing cyclopropyl or cyclobutyl groups.
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
(2023)
Article
Chemistry, Physical
Xiong Wang, Xiao Yan, Jiayu Du, Bingqiang Ji, Mohammad Jalal Inanlu, Qi Min, Nenad Miljkovic
Summary: The spreading behavior of microdroplets differs from larger droplets due to the influence of size and surface tension. Experiments showed that the initial spreading of smaller droplets is shorter with reduced oscillation damping compared to millimeter-scale droplets. The coupling between spreading velocity and dynamic contact angle may have applications in microscale heat transfer, advanced manufacturing, and aerosol transmission studies.
JOURNAL OF COLLOID AND INTERFACE SCIENCE
(2023)
Article
Engineering, Environmental
Yu Xu, Yuzo Miyazaki, Eri Tachibana, Kei Sato, Sathiyamurthi Ramasamy, Tomoki Mochizuki, Yasuhiro Sadanaga, Yoshihiro Nakashima, Yosuke Sakamoto, Kazuhide Matsuda, Yoshizumi Kajii
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2020)
Article
Environmental Sciences
Bich-Thuy Ly, Yoshizumi Kajii, Thi-Yen-Lien Nguyen, Koki Shoji, Dieu-Anh Van, Thi-Nhu-Ngoc Do, Trung-Dung Nghiem, Yosuke Sakamoto
Article
Environmental Sciences
Jiaru Li, Yosuke Sakamoto, Nanase Kohno, Tomihide Fujii, Kohei Matsuoka, Marina Takemura, Jun Zhou, Maho Nakagawa, Kentaro Murano, Yasuhiro Sadanaga, Yoshihiro Nakashima, Kei Sato, Akinori Takami, Ayako Yoshino, Tomoki Nakayama, Shungo Kato, Yoshizumi Kajii
SCIENCE OF THE TOTAL ENVIRONMENT
(2020)
Article
Chemistry, Physical
Nanase Kohno, Jiaru Li, Yosuke Sakamoto, Yoshizumi Kajii
Summary: The study successfully detected Peroxy (RO2) radicals derived from short-chain alkanes using an improved technique, validating the system's effectiveness. Additionally, global fitting analysis was employed to determine rate constants for different reaction pathways, with results consistent with previous estimates.
INTERNATIONAL JOURNAL OF CHEMICAL KINETICS
(2021)
Article
Environmental Sciences
Srinivas Bikkina, Kimitaka Kawamura, Yosuke Sakamoto, Jun Hirokawa
Summary: Oxidation of isoprene can lead to the production of oxalic acid, with methylglyoxal identified as an important intermediate. The relative abundances of methylglyoxal and oxalic acid fluctuate significantly during the reaction, suggesting a complex pathway of oxalic acid formation under dry conditions. The study proposes new reaction schemes for interpreting the ambient SOA composition and highlights the stable character of C-2 towards oxidation by hydroxyl radicals.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Environmental Sciences
Yosuke Sakamoto, Nanase Kohno, Sathiyamurthi Ramasamy, Kei Sato, Yu Morino, Yoshizumi Kajii
Summary: The present study investigated the change in OH-reactivity during the OH-initiated photo-oxidation of isoprene, alpha-pinene and m-xylene under high NOx conditions. The results showed that vapor wall loss and aerosol formation strongly affected the OH reactivity when multiple oxidations were involved.
ATMOSPHERIC ENVIRONMENT
(2022)
Article
Environmental Sciences
Jiaru Li, Nanase Kohno, Yosuke Sakamoto, Yukiko Fukusaki, Yuka Kousa, Yasuhiro Sadanaga, Yoshihiro Nakashima, Kei Sato, Sathiyamurthi Ramasamy, Akinori Takami, Ayako Yoshino, Tomoki Nakayama, Shungo Kato, Natsuki Ono, Jun Zhou, Yu Bai, Yoshizumi Kajii
Summary: Field measurements in the Keihin coastal industrial area during summer 2019 characterized air quality and ozone production potential with moderate OH reactivity and minimal missing OH reactivity compared to other campaigns. Oceanic air masses may influence coastal industrial areas, while ozone production rate shows a positive correlation with the reactivity ratio between VOCs and NOx.
ATMOSPHERIC ENVIRONMENT
(2021)
Article
Environmental Sciences
Alimata Sidibe, Yosuke Sakamoto, Kentaro Murano, Ousmane A. Koita, Ibrahim Traore, Yacouba Dansoko, Yoshizumi Kajii
Summary: This study aimed to characterize personal exposure to PM2.5 in the city of Bamako, Mali. The findings revealed that different daily activities and microenvironments had an impact on PM2.5 concentrations, with insecticides, incense, traffic, and cooking identified as the main sources of exposure. The study also found that office workers and students had the lowest levels of exposure, while drivers and cooks had the highest levels. These concentrations exceeded the recommended exposure levels by the World Health Organization, highlighting the need for measures to improve air quality and protect public health.
INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH
(2022)
Article
Environmental Sciences
Nanase Kohno, Jun Zhou, Jiaru Li, Marina Takemura, Natsuki Ono, Yasuhiro Sadanaga, Yoshihiro Nakashima, Kei Sato, Shungo Kato, Yosuke Sakamoto, Yoshizumi Kajii
Summary: This study evaluates the impact of missing OH reactivity and heterogeneous loss of HO2 on the photochemical ozone production potential and regime analysis. It finds that these factors affect the ozone production potential and relative sensitivity, especially during the NOx-limited regime. Furthermore, the effect of aerosol uptake on ozone production is anti-correlated with NO concentration, peaking at minimum NO concentration.
ATMOSPHERIC ENVIRONMENT
(2022)
Article
Environmental Sciences
Alimata Sidibe, Yosuke Sakamoto, Kentaro Murano, Keiichi Sato, Akie Yuba, Mari Futami, Ousmane A. Koita, Ibrahim Traore, Yoshizumi Kajii
Summary: Household particulate matter (PM) is a major health concern in developing regions. This study characterized the chemical composition of PM in Bamako, Mali and found that it varied with emission source and combustion conditions. The results showed that the health risk from PM emissions exceeded recommended limits and effective air pollution mitigation strategies are needed.
Article
Engineering, Environmental
Jiaru Li, Nanase Kohno, Yosuke Sakamoto, Huy Gia Pham, Kentaro Murano, Kei Sato, Tomoki Nakayama, Yoshizumi Kajii
Summary: This study presents data on total OH reactivity, ancillary trace species, HO2 reactivity, and complex isoprene-derived RO2 reactivity due to ambient aerosols measured during the AQUAS-Kyoto campaign in September 2020. The study reveals that missing OH reactivity may originate from natural-emission areas and measures the real-time loss rates of HO2 and RO2 onto ambient aerosols continuously and alternately for the first time. The study also finds that missing OH reactivity can enhance ozone production potential and the uptake of radicals by aerosols can significantly suppress ozone production.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2022)
Article
Energy & Fuels
Muxi Wang, Akira Matsugi, Yoshinori Kondo, Yosuke Sakamoto, Yoshizumi Kajii
Summary: Hydrogen addition affects the composition of exhaust gases in vehicles. The study investigated the effects of hydrogen addition on fuel consumption and exhaust gas components in a truck with a direct-injection diesel engine. The results showed a linear dependence between the reduction in diesel consumption and the increase in hydrogen energy share. However, there was an increase in NOx emissions when hydrogen was added.
Article
Chemistry, Physical
Yasuyuki Endo, Yosuke Sakamoto, Yoshizumi Kajii, Shinichi Enami
Summary: This study investigates the liquid-phase decomposition kinetics of multifunctionalized alpha-alkoxyalkyl-hydroperoxides (alpha-AHs). The results reveal that hemiacetal species are the main decomposition products and the reaction rate is influenced by pH and temperature.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2022)
Article
Environmental Sciences
Jun Zhou, Kei Sato, Yu Bai, Yukiko Fukusaki, Yuka Kousa, Sathiyamurthi Ramasamy, Akinori Takami, Ayako Yoshino, Tomoki Nakayama, Yasuhiro Sadanaga, Yoshihiro Nakashima, Jiaru Li, Kentaro Murano, Nanase Kohno, Yosuke Sakamoto, Yoshizumi Kajii
Summary: The HO2 uptake kinetics onto ambient aerosols are crucial in tropospheric chemistry, yet not fully understood. Due to the low reactivity of ambient aerosols, traditional analytical techniques are unable to achieve the necessary precision. This study developed an online approach to investigate the lower-limit values of HO2 reactivities and HO2 uptake coefficients onto ambient aerosols, revealing the key role of transition metals in these processes.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2021)
Article
Environmental Sciences
Jun Zhou, Kentaro Murano, Nanase Kohno, Yosuke Sakamoto, Yoshizumi Kajii
ATMOSPHERIC ENVIRONMENT
(2020)