Article
Environmental Sciences
Alexander J. Johnson, Cliff I. Davidson
Summary: The dry deposition rate of chemical species can be estimated by measuring its concentration in surface runoff and fresh rain during a sufficiently long period of dry weather. Experiments conducted in Syracuse, New York show that this method is feasible for estimating dry deposition of aerosols. The results suggest the importance of having antecedent dry periods and indicate that wet deposition and contaminants in fresh rain can significantly affect the estimation.
ATMOSPHERIC ENVIRONMENT
(2023)
Article
Chemistry, Physical
Anand B. Puthirath, Eliezer F. Oliveira, Guanhui Gao, Nithya Chakingal, Harikishan Kannan, Chenxi Li, Xiang Zhang, Abhijit Biswas, Mahesh R. Neupane, Bradford B. Pate, Dmitry A. Ruzmetov, A. Glen Birdwell, Tony G. Ivanov, Douglas S. Galvao, Robert Vajtai, Pulickel M. Ajayan
Summary: The study found that Hummer's method is very effective in oxidizing pristine diamond surfaces, especially in the presence of strong oxidizing agents. Microcrystalline diamond powder is more prone to oxidation to polycrystalline diamond wafers.
CHEMISTRY OF MATERIALS
(2021)
Article
Multidisciplinary Sciences
Hongmiao Tian, Duorui Wang, Yahui Zhang, Yuanze Jiang, Tianci Liu, Xiangming Li, Chunhui Wang, Xiaoliang Chen, Jinyou Shao
Summary: This study proposes a core-shell adhesive structure obtained through a growth strategy, which exhibits excellent adhesion on rough surfaces ranging from the nanoscale to the microscale.
NATURE COMMUNICATIONS
(2022)
Article
Energy & Fuels
Amene Rahbar, Naeimeh Bahri-Laleh, Mehdi Nekoomanesh-Haghighi
Summary: The research aims to investigate the synthesis process and characteristics of PAO4 and PAO6 using the AlCl3/solvent system, with results showing that the presence of an optimized amount of xylene allows for the production of PAO with comparable properties to commercial grades.
Article
Engineering, Chemical
Sergio M. Vilas-Boas, Mariana C. da Costa, Joao A. P. Coutinho, Olga Ferreira, Simao P. Pinho
Summary: Terpenes and terpenoids are extensively used secondary metabolites in the cosmetic, pharmaceutical, and food industrial areas. This study investigated the water solubility and octanol-water partition coefficients of various monoterpenoids, and assessed their distribution in different environmental compartments using a chemical space diagram.
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
(2022)
Article
Nanoscience & Nanotechnology
Sangho Lee, Wonmoo Lee, Hee-Tae Jung, Caroline A. Ross
Summary: Block copolymer self-assembly can produce surfaces with chemical and topographical patterns, guiding the formation of Cu nanostructures by exploiting differences in the mobility of vapor-deposited species on each microdomain. This process provides a route for fabricating heterogeneous metallic nanostructures.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Chemistry, Physical
Ruifan Tan, Ping Wang, Luyao Guo, Zupeng Chen, Ronghe Lin, Xiaoling Mou, Yunjie Ding
Summary: The shape of the carriers plays a significant role in the catalytic performance of metal-supported catalysts. This study investigates the impact of different shapes of ZrO2 (nanorods-like, spherical, and irregular nanoparticles) on the catalytic performance in methane dry reforming by dispersing Ni species. Various characterization techniques are used to analyze the fresh and spent catalysts. The reducibility of NiO species is found to follow the order of Ni/RZ.
Article
Chemistry, Applied
Piyush Ingale, Chengyue Guan, Ralph Kraehnert, Raoul Naumann d'Alnoncourt, Arne Thomas, Frank Rosowski
Summary: The study utilizes a molecular layer deposition method to stabilize DRM catalysts, effectively preventing deactivation and showing better performance compared to traditional atomic layer deposition.
Article
Chemistry, Multidisciplinary
Joseph M. Prisaznuk, Peter Huang, Xin Yong, Paul R. Chiarot
Summary: By using surface energy patterning and electrospray atomization, we created nonspherical droplets and observed the assembly of microparticles at the liquid-air interface. We found that the underlying surface energy pattern played a significant role in the colloidal assembly, driving particles towards the center of the droplet. The particles formed a single, non-close-packed cluster with local hexagonal ordering, but left a clear region with very few particles near the contact line, which was attributed to long-range electrostatic repulsion from the photoresist used to create the surface energy pattern.
Article
Materials Science, Multidisciplinary
Justin K. George, Nishith Verma, Bhaskar Bhaduri
Summary: The study describes the synthesis of carbon nanofibers (CNFs) over the graphitic carbon nitride (g-C3N4) using copper (Cu) as the catalyst, resulting in a porous and hydrophilic composite material. The composite demonstrated efficient adsorption of aqueous methylene blue (MB) due to its negatively electrostatic surface charge, hydrophilic characteristics, and high BET surface area. The data suggests the synthesized material is an efficient adsorbent for removing cationic molecules from wastewater.
Review
Chemistry, Multidisciplinary
Zahid Hassan, Divya Varadharajan, Christoph Zippel, Salma Begum, Joerg Lahann, Stefan Braese
Summary: This article summarizes the structurally controlled polymer surfaces and their post-synthetic modulation, which have tremendous potential for application in molecular engineering and interfacial science. Innovative approaches for the templated synthesis of shape-controlled polymers and the design strategies for multifunctional polymer surfaces are also discussed.
ADVANCED MATERIALS
(2022)
Article
Engineering, Chemical
Han Feng, Yen Nan Liang, Chun Po Hu, Xiao Hu
Summary: In this study, two-dimensional ultrathin InVO4 nanoribbons with high adsorption capacity and ease of regeneration were synthesized. The material exhibited impressive selective adsorption capabilities towards cationic dyes, with strong electrostatic attraction identified as the predominant adsorption mechanism. Additionally, the adsorbents showed remarkable resilience to pH variation and could be rapidly and efficiently regenerated.
SEPARATION AND PURIFICATION TECHNOLOGY
(2022)
Article
Pharmacology & Pharmacy
Jiayi Li, Sibo Ma, Ying Sun, Ruxiao Song, Baoli Cai, Hao Li, Ying Chen, Xin Zhang, Jian Guan, Shirui Mao
Summary: Rheological properties are an effective tool for predicting the deposition behavior of dry powder inhalers (DPIs) in both single and combined systems.
EUROPEAN JOURNAL OF PHARMACEUTICS AND BIOPHARMACEUTICS
(2022)
Article
Chemistry, Physical
Amel Taha
Summary: This research reported the biogenic synthesis of CuO nanoplates using Saussurea costus root extract. The phytochemical contents in the root extract act as the reducing and capping agents for the nanoparticles. The biosynthesized CuO nanoplates exhibited a plate-like shape with a mean size of 29 nm and showed high catalytic activity for the reduction of 4-nitrophenol.
Article
Polymer Science
Noureddine Akartasse, Khalil Azzaoui, Elmiloud Mejdoubi, Belkheir Hammouti, Lhaj Lahcen Elansari, Mohamed Abou-salama, Mohamed Aaddouz, Rachid Sabbahi, Larbi Rhazi, Mohamed Siaj
Summary: This study developed a new natural-based adsorbent for the removal of cationic dye methylene blue. The nanocomposite based on hydroxyapatite and hydroxypropyl methylcellulose showed high adsorption efficiency and compatibility. The adsorption process followed the Langmuir isotherm model and pseudo-second-order kinetics.
Article
Engineering, Environmental
Junting Qiu, Kenichi Tonokura, Shinichi Enami
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2020)
Article
Chemistry, Physical
Ryuichi Wada, Kenichi Tonokura, Shohei Koba, Tomonobu Imamura, Kosuke Nakai, Hiroshi Ushiyama, Koichi Yamashita, Yutaka Matsumi, Shinichi Enami, Paul W. Seakins
Summary: The equilibrium geometries and enthalpies of adduct formations between alkyl iodides and chlorine atoms were studied. It was found that the enthalpies decreased as the number of alkyl substituents on the carbon atom bonded to the iodine increased. This suggests that the charge transfer from the alkyl group to I-Cl increases with the number of substituents, leading to adduct stabilization. Charge density distribution between the Cl and H atoms also plays a role in stabilizing the adducts.
CHEMICAL PHYSICS LETTERS
(2021)
Article
Chemistry, Physical
Shinichi Enami
Summary: Understanding the fate of organic hydroperoxides (ROOHs) in atmospheric condensed phases is crucial for assessing the oxidative and toxicological potentials of particulate matter. Recent studies have shown that liquid-phase alpha-hydroxyalkyl hydroperoxides can decompose to geminal diols and H2O2 depending sensitively on water content, pH, and temperature, with H+-catalyzed conversion playing a key role in the process.
JOURNAL OF PHYSICAL CHEMISTRY A
(2021)
Article
Engineering, Environmental
Mingxi Hu, Kenichi Tonokura, Yu Morino, Kei Sato, Shinichi Enami
Summary: In this study, the effects of atmospherically relevant metal ions on the decomposition of alpha-hydroxyalkyl-hydroperoxides derived from the ozonolysis of alpha-terpineol in aqueous solutions were investigated using mass spectrometry. It was found that in acidic aqueous media, the reaction of alpha-HHs with Fe2+ is outcompeted by H+-catalyzed decomposition of alpha-HHs, producing aldehydes and H2O2 which can in turn react with Fe2+ to form hydroxyl radicals.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2021)
Article
Chemistry, Multidisciplinary
Agustin J. Colussi, Shinichi Enami, Shinnosuke Ishizuka
Summary: It has been found that atmospheric cloud, fog, and aerosol microdroplets are more acidic than previously assumed, with sharp changes in acidity across interfacial layers. Surface-specific experiments show significant differences in protonation of gas-phase molecules at the outermost layer of aqueous microdroplets compared to deeper layers.
ACS EARTH AND SPACE CHEMISTRY
(2021)
Article
Chemistry, Physical
Junting Qiu, Michiya Fujita, Kenichi Tonokura, Shinichi Enami
Summary: Secondary ozonides (SOZs), key products of the ozonolysis of biogenic terpenoids, have been found to persist in atmospheric condensed phases until they are delivered to the epithelial lining fluid of the pulmonary alveoli via inhaled particulate matter, potentially exerting previously unrecognized adverse health effects.
JOURNAL OF PHYSICAL CHEMISTRY A
(2022)
Editorial Material
Chemistry, Physical
Agustin J. Colussi, Shinichi Enami
Summary: A recent paper reported that photoelectron spectroscopy could not detect any products on the surface of aqueous Fe2+ jets dosed with gaseous hydrogen peroxide. However, the conclusion drawn in this paper is untenable because undetected species cannot be asserted.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Shinichi Enami
Summary: Organic hydroperoxides play important roles in atmospheric, environmental, and biological chemistry, and their H+ catalyzed decomposition can generate H2O2 and multifunctionalized compounds.
ACS EARTH AND SPACE CHEMISTRY
(2022)
Article
Chemistry, Physical
Naoki Numadate, Shota Saito, Yuki Nojima, Taka-aki Ishibashi, Shinichi Enami, Tetsuya Hama
Summary: Ultraviolet photolysis of fatty acid surfactants can generate hydroxyl radicals, but the dimerization structure of nonanoic acid's surface inhibits its photochemical reactivity.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Physical
Shinichi Enami, Yu Morino, Kei Sato
Summary: This study reports the oxidation of Levoglucosan (Levo) in aqueous solutions using Fenton's reagent. The major products were oxygen-atom incorporated species. The results indicate that hydroxyl radicals (OH) preferentially abstract H atoms from carbon atoms with attached hydroxyl groups (-OH), followed by the formation of carbonyl groups (-C=O).
JOURNAL OF PHYSICAL CHEMISTRY A
(2023)
Article
Environmental Sciences
Mingxi Hu, Kunpeng Chen, Junting Qiu, Ying-Hsuan Lin, Kenichi Tonokura, Shinichi Enami
Summary: Organic hydroperoxides play important roles in the atmosphere, but the decomposition mechanisms in the liquid phase are not well understood. In this study, the decomposition of alpha-alkoxyalkyl-hydroperoxides derived from the ozonolysis of alpha-terpineol was investigated. Experimental and theoretical analysis revealed that a proton-catalyzed mechanism plays a central role in the decomposition, with water molecules also affecting the kinetics. These findings provide insights into the formation and transformation processes of organic hydroperoxides in the atmosphere.
ENVIRONMENTAL SCIENCE-ATMOSPHERES
(2022)
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
Yange Deng, Satoshi Inomata, Kei Sato, Sathiyamurthi Ramasamy, Yu Morino, Shinichi Enami, Hiroshi Tanimoto
Summary: This study systematically investigated the temperature and acidity dependence of SOA yields and chemical components from alpha-pinene ozonolysis. It found that under acidic seed conditions, the formation of multiple oligomers was greatly enhanced.
ATMOSPHERIC CHEMISTRY AND PHYSICS
(2021)
Article
Chemistry, Physical
Mingxi Hu, Junting Qiu, Kenichi Tonokura, Shinichi Enami
Summary: The study investigated the aqueous-phase fates of alpha-AHs derived from the ozonolysis of alpha-terpineol in the presence of various alcohols. The decomposition of alpha-AHs was found to be catalyzed by H+ in acidic conditions, leading to the formation of multifunctional species such as hemiacetals and lactols. This H+-catalyzed decomposition process may be faster than other degradation processes in the atmosphere.
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
(2021)
Article
Environmental Sciences
Sathiyamurthi Ramasamy, Tomoki Nakayama, Yu Morino, Takashi Imamura, Yoshizumi Kajii, Shinichi Enami, Kei Sato
Summary: The study demonstrates that aging processes initiated by different oxidants result in changes in the composition and distribution of downstream products from limonene ozonolysis, but the total yields of secondary organic aerosol (SOA) produced are similar.
ATMOSPHERIC ENVIRONMENT-X
(2021)