1
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Freedman MA, Huang Q, Pitta KR. Phase Transitions in Organic and Organic/Inorganic Aerosol Particles. Annu Rev Phys Chem 2024; 75:257-281. [PMID: 38382569 DOI: 10.1146/annurev-physchem-083122-115909] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/23/2024]
Abstract
The phase state of aerosol particles can impact numerous atmospheric processes, including new particle growth, heterogeneous chemistry, cloud condensation nucleus formation, and ice nucleation. In this article, the phase transitions of inorganic, organic, and organic/inorganic aerosol particles are discussed, with particular focus on liquid-liquid phase separation (LLPS). The physical chemistry that determines whether LLPS occurs, at what relative humidity it occurs, and the resultant particle morphology is explained using both theoretical and experimental methods. The known impacts of LLPS on aerosol processes in the atmosphere are discussed. Finally, potential evidence for LLPS from field and chamber studies is presented. By understanding the physical chemistry of the phase transitions of aerosol particles, we will acquire a better understanding of aerosol processes, which in turn impact human health and climate.
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Affiliation(s)
- Miriam Arak Freedman
- Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania, USA; ,
- Department of Meteorology and Atmospheric Science, The Pennsylvania State University, University Park, Pennsylvania, USA
| | - Qishen Huang
- Institute of Chemical Physics, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing, China;
| | - Kiran R Pitta
- Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania, USA; ,
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2
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Şengül SN, Ozturk S, Ulubayram K, Pekel Bayramgil N, Kucukkaya Eren S. Effect of final irrigation protocols with chitosan nanoparticle and genipin on dentine against collagenase degradation: An ex-vivo study. Int Endod J 2024; 57:477-489. [PMID: 38240378 DOI: 10.1111/iej.14027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2023] [Revised: 12/03/2023] [Accepted: 01/10/2024] [Indexed: 03/07/2024]
Abstract
AIM Endodontic irrigants may affect the mechanical and chemical properties of dentine. This study evaluated the effects of various final irrigation protocols including the use of chitosan nanoparticle (CSnp) and cross-linking with genipin on the (1) mechanical and (2) chemical properties of dentine against enzymatic degradation. METHODOLOGY CSnp was synthesized and characterized considering physiochemical parameters and stability. The root canals of 90 single-rooted teeth were prepared and irrigated with NaOCl. Dentine discs were obtained and divided into groups according to the following irrigation protocols: Group NaOCl+EDTA, Group NaOCl+CSnp, Group NaOCl+EDTA+CSnp, Group NaOCl+CSnp+Genipin, Group NaOCl+EDTA+CSnp+Genipin and Group distilled water. (1) Mechanical changes were determined by microhardness analysis using Vickers-tester. (2) Chemical changes were determined by evaluating molecular and elemental compositions of dentine using Fourier transform infrared spectroscopy (FTIR) analysis and scanning electron microscope (SEM)/energy dispersive X-ray spectroscopy (EDS) analysis, respectively. All analyses were repeated after the discs were kept in collagenase for 24 h. Data were analysed with repeated measures analysis of variance and Bonferroni correction for microhardness analysis, and Kruskal-Wallis and Wilcoxon tests for FTIR and SEM/EDS analyses (p = .05). RESULTS (1) Collagenase application did not have a negative effect on microhardness only in Group NaOCl+EDTA+CSnp+Genipin when compared with the post-irrigation values (p > .05). Post-collagenase microhardness of Group NaOCl+EDTA+CSnp and Group NaOCl+CSnp+Genipin was similar to the initial microhardness (p > .05). (2) After collagenase, Amide III/PO 4 3 - ratio presented no change in Group NaOCl+EDTA+CSnp, Group NaOCl+CSnp+Genipin and Group NaOCl+EDTA+CSnp+Genipin (p > .05), while decreased in other groups (p < .05). Collagenase did not affectCO 3 2 - /PO 4 3 - ratio in the groups (p > .05). There were no changes in the groups in terms of elemental level before and after collagenase application (p > .05). CONCLUSIONS CSnp and genipin positively affected the microhardness and molecular composition of dentine. This effect was more pronounced when CSnp was used after EDTA.
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Affiliation(s)
- S N Şengül
- Department of Endodontics, Faculty of Dentistry, Hacettepe University, Ankara, Turkey
| | - S Ozturk
- Department of Basic Pharmaceutical Sciences, Faculty of Pharmacy, Hacettepe University, Ankara, Turkey
| | - K Ulubayram
- Department of Basic Pharmaceutical Sciences, Faculty of Pharmacy, Hacettepe University, Ankara, Turkey
| | - N Pekel Bayramgil
- Department of Chemistry, Faculty of Science, Hacettepe University, Ankara, Turkey
| | - S Kucukkaya Eren
- Department of Endodontics, Faculty of Dentistry, Hacettepe University, Ankara, Turkey
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3
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El Hajj O, Hartness SW, Vandergrift GW, Park Y, Glenn CK, Anosike A, Webb AR, Dewey NS, Doner AC, Cheng Z, Jatana GS, Moses-DeBusk M, China S, Rotavera B, Saleh R. Alkylperoxy radicals are responsible for the formation of oxygenated primary organic aerosol. SCIENCE ADVANCES 2023; 9:eadj2832. [PMID: 37976350 PMCID: PMC10656070 DOI: 10.1126/sciadv.adj2832] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/16/2023] [Accepted: 10/18/2023] [Indexed: 11/19/2023]
Abstract
Organic aerosol (OA) is an air pollutant ubiquitous in urban atmospheres. Urban OA is usually apportioned into primary OA (POA), mostly emitted by mobile sources, and secondary OA (SOA), which forms in the atmosphere due to oxidation of gas-phase precursors from anthropogenic and biogenic sources. By performing coordinated measurements in the particle phase and the gas phase, we show that the alkylperoxy radical chemistry that is responsible for low-temperature ignition also leads to the formation of oxygenated POA (OxyPOA). OxyPOA is distinct from POA emitted during high-temperature ignition and is chemically similar to SOA. We present evidence for the prevalence of OxyPOA in emissions of a spark-ignition engine and a next-generation advanced compression-ignition engine, highlighting the importance of understanding OxyPOA for predicting urban air pollution patterns in current and future atmospheres.
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Affiliation(s)
- Omar El Hajj
- School of Environmental, Civil, Agricultural, and Mechanical Engineering, University of Georgia, Athens, GA 30602, USA
| | - Samuel W. Hartness
- School of Environmental, Civil, Agricultural, and Mechanical Engineering, University of Georgia, Athens, GA 30602, USA
| | | | - Yensil Park
- Energy and Transportation Science Division, Oak Ridge National Laboratory. Oak Ridge, TN 37831, USA
| | - Chase K. Glenn
- School of Environmental, Civil, Agricultural, and Mechanical Engineering, University of Georgia, Athens, GA 30602, USA
| | - Anita Anosike
- School of Environmental, Civil, Agricultural, and Mechanical Engineering, University of Georgia, Athens, GA 30602, USA
| | - Annabelle R. Webb
- Department of Chemistry, University of Georgia, Athens, GA 30602, USA
| | - Nicholas S. Dewey
- Department of Chemistry, University of Georgia, Athens, GA 30602, USA
| | - Anna C. Doner
- Department of Chemistry, University of Georgia, Athens, GA 30602, USA
| | - Zezhen Cheng
- Pacific Northwest National Laboratory, Richland, WA 99352, USA
| | - Gurneesh S. Jatana
- Energy and Transportation Science Division, Oak Ridge National Laboratory. Oak Ridge, TN 37831, USA
| | - Melanie Moses-DeBusk
- Energy and Transportation Science Division, Oak Ridge National Laboratory. Oak Ridge, TN 37831, USA
| | - Swarup China
- Pacific Northwest National Laboratory, Richland, WA 99352, USA
| | - Brandon Rotavera
- School of Environmental, Civil, Agricultural, and Mechanical Engineering, University of Georgia, Athens, GA 30602, USA
- Department of Chemistry, University of Georgia, Athens, GA 30602, USA
| | - Rawad Saleh
- School of Environmental, Civil, Agricultural, and Mechanical Engineering, University of Georgia, Athens, GA 30602, USA
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4
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Gregson FKA, Gerrebos NGA, Schervish M, Nikkho S, Schnitzler EG, Schwartz C, Carlsten C, Abbatt JPD, Kamal S, Shiraiwa M, Bertram AK. Phase Behavior and Viscosity in Biomass Burning Organic Aerosol and Climatic Impacts. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2023; 57:14548-14557. [PMID: 37729583 DOI: 10.1021/acs.est.3c03231] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/22/2023]
Abstract
Smoke particles generated by burning biomass consist mainly of organic aerosol termed biomass burning organic aerosol (BBOA). BBOA influences the climate by scattering and absorbing solar radiation or acting as nuclei for cloud formation. The viscosity and the phase behavior (i.e., the number and type of phases present in a particle) are properties of BBOA that are expected to impact several climate-relevant processes but remain highly uncertain. We studied the phase behavior of BBOA using fluorescence microscopy and showed that BBOA particles comprise two organic phases (a hydrophobic and a hydrophilic phase) across a wide range of atmospheric relative humidity (RH). We determined the viscosity of the two phases at room temperature using a photobleaching method and showed that the two phases possess different RH-dependent viscosities. The viscosity of the hydrophobic phase is largely independent of the RH from 0 to 95%. We use the Vogel-Fulcher-Tamman equation to extrapolate our results to colder and warmer temperatures, and based on the extrapolation, the hydrophobic phase is predicted to be glassy (viscosity >1012 Pa s) for temperatures less than 230 K and RHs below 95%, with possible implications for heterogeneous reaction kinetics and cloud formation in the atmosphere. Using a kinetic multilayer model (KM-GAP), we investigated the effect of two phases on the atmospheric lifetime of brown carbon within BBOA, which is a climate-warming agent. We showed that the presence of two phases can increase the lifetime of brown carbon in the planetary boundary layer and polar regions compared to previous modeling studies. Hence, the presence of two phases can lead to an increase in the predicted warming effect of BBOA on the climate.
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Affiliation(s)
- Florence K A Gregson
- Department of Chemistry, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
| | - Nealan G A Gerrebos
- Department of Chemistry, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
| | - Meredith Schervish
- Department of Chemistry, University of California, Irvine, Irvine, California 92697, United States
| | - Sepehr Nikkho
- Department of Chemistry, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
| | - Elijah G Schnitzler
- Department of Chemistry, Oklahoma State University, Stillwater, Oklahoma 74078, United States
| | - Carley Schwartz
- Department of Medicine, Division of Respiratory Medicine, University of British Columbia, Vancouver, British Columbia V5Z 1M9, Canada
| | - Christopher Carlsten
- Department of Medicine, Division of Respiratory Medicine, University of British Columbia, Vancouver, British Columbia V5Z 1M9, Canada
| | - Jonathan P D Abbatt
- Department of Chemistry, University of Toronto, Toronto, Ontario M5S 3H6, Canada
| | - Saeid Kamal
- Department of Chemistry, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
| | - Manabu Shiraiwa
- Department of Chemistry, University of California, Irvine, Irvine, California 92697, United States
| | - Allan K Bertram
- Department of Chemistry, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
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5
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Lee WC, Liu P, Han Y, Martin ST, Kuwata M. Accounting for Cloud Nucleation Activation Mechanism of Secondary Organic Matter from α-Pinene Oxidation Using Experimentally Retrieved Water Solubility Distributions. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2023; 57:13439-13448. [PMID: 37647587 DOI: 10.1021/acs.est.3c03039] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/01/2023]
Abstract
Activation of cloud droplets of aerosol particles from biogenic precursors plays a critical role in Earth's climate system. However, the molecular-level understanding of the cloud condensation nuclei (CCN) activation process for secondary organic matter (SOM) is still lacking. Here, we reduced the gap by segregating SOM from α-pinene based on water solubility. The chemical composition and CCN activity of the solubility-segregated fractions of SOM were measured. The results demonstrated for the first time by laboratory experiment that highly oxygenated compounds such as hydroperoxides and highly oxygenated organic molecules are important contributors for the CCN activity of α-pinene SOM. Meanwhile, relatively less water-soluble species were also abundant. Analysis based on the Köhler theory demonstrated that less water-soluble compounds in SOM remain undissolved during the cloud activation process, suggesting that the traditional single-parameter parameterization for CCN activation would not be sufficient for representing the process. In combination with the recent developments in SOM formation chemistry, the present study helps in understanding the interactions between the biosphere and climate.
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Affiliation(s)
- Wen-Chien Lee
- Department of Atmospheric and Oceanic Sciences, Laboratory for Climate and Ocean-Atmosphere Studies, Peking University, Beijing 100871, China
- Beijing Innovation Center for Engineering Science and Advanced Technology (BIC-ESAT), Peking University, Beijing 100871, China
- Division of Chemistry and Biochemistry, Nanyang Technological University, Singapore 639798, Singapore
- Earth Observatory of Singapore, Nanyang Technological University, Singapore 639798, Singapore
- John A. Paulson School of Environment and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, United States
| | - Pengfei Liu
- John A. Paulson School of Environment and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, United States
| | - Yuemei Han
- John A. Paulson School of Environment and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, United States
| | - Scot T Martin
- John A. Paulson School of Environment and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, United States
- Department of Earth and Planetary Sciences, Harvard University, Cambridge, Massachusetts 02138, United States
| | - Mikinori Kuwata
- Department of Atmospheric and Oceanic Sciences, Laboratory for Climate and Ocean-Atmosphere Studies, Peking University, Beijing 100871, China
- Beijing Innovation Center for Engineering Science and Advanced Technology (BIC-ESAT), Peking University, Beijing 100871, China
- Division of Chemistry and Biochemistry, Nanyang Technological University, Singapore 639798, Singapore
- Earth Observatory of Singapore, Nanyang Technological University, Singapore 639798, Singapore
- Campus for Research Excellence and Technological Enterprise (CREATE) Programme, Singapore 138602, Singapore
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6
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Mahrt F, Huang Y, Zaks J, Devi A, Peng L, Ohno PE, Qin YM, Martin ST, Ammann M, Bertram AK. Phase Behavior of Internal Mixtures of Hydrocarbon-like Primary Organic Aerosol and Secondary Aerosol Based on Their Differences in Oxygen-to-Carbon Ratios. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2022; 56:3960-3973. [PMID: 35294833 PMCID: PMC8988305 DOI: 10.1021/acs.est.1c07691] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/16/2023]
Abstract
The phase behavior, the number and type of phases, in atmospheric particles containing mixtures of hydrocarbon-like organic aerosol (HOA) and secondary organic aerosol (SOA) is important for predicting their impacts on air pollution, human health, and climate. Using a solvatochromic dye and fluorescence microscopy, we determined the phase behavior of 11 HOA proxies (O/C = 0-0.29) each mixed with 7 different SOA materials generated in environmental chambers (O/C 0.4-1.08), where O/C represents the average oxygen-to-carbon atomic ratio. Out of the 77 different HOA + SOA mixtures studied, we observed two phases in 88% of the cases. The phase behavior was independent of relative humidity over the range between 90% and <5%. A clear trend was observed between the number of phases and the difference between the average O/C ratios of the HOA and SOA components (ΔO/C). Using a threshold ΔO/C of 0.265, we were able to predict the phase behavior of 92% of the HOA + SOA mixtures studied here, with one-phase particles predicted for ΔO/C < 0.265 and two-phase particles predicted for ΔO/C ≥ 0.265. The threshold ΔO/C value provides a relatively simple and computationally inexpensive framework for predicting the number of phases in internal SOA and HOA mixtures in atmospheric models.
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Affiliation(s)
- Fabian Mahrt
- Department
of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia V6T1Z1, Canada
- Laboratory
of Environmental Chemistry, Paul Scherrer
Institute, 5232 Villigen, Switzerland
| | - Yuanzhou Huang
- Department
of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia V6T1Z1, Canada
| | - Julia Zaks
- Department
of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia V6T1Z1, Canada
| | - Annesha Devi
- Department
of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia V6T1Z1, Canada
| | - Long Peng
- Department
of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia V6T1Z1, Canada
- Institute
for Environmental and Climate Research, Jinan University, Guangzhou 511443, China
| | - Paul E. Ohno
- John
A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, United States
- Center
for the Environment, Harvard University, Cambridge, Massachusetts 02138, United States
| | - Yi Ming Qin
- John
A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, United States
| | - Scot T. Martin
- John
A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, United States
- Department
of Earth and Planetary Sciences, Harvard
University, Cambridge, Massachusetts 02138, United States
| | - Markus Ammann
- Laboratory
of Environmental Chemistry, Paul Scherrer
Institute, 5232 Villigen, Switzerland
| | - Allan K. Bertram
- Department
of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia V6T1Z1, Canada
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