Maxim Philippov
A5090585494- Atmospheric chemistry and aerosols
- Atmospheric Ozone and Climate
- Astrophysics and Cosmic Phenomena
- Atmospheric aerosols and clouds
- Solar and Space Plasma Dynamics
- Earthquake Detection and Analysis
- Air Quality and Health Impacts
- Heat Transfer Mechanisms
- Atmospheric and Environmental Gas Dynamics
- Fluid Dynamics and Turbulent Flows
- Ionosphere and magnetosphere dynamics
- Combustion and flame dynamics
- Dark Matter and Cosmic Phenomena
- Calibration and Measurement Techniques
- Radioactivity and Radon Measurements
- Nuclear Physics and Applications
- Radiation Detection and Scintillator Technologies
- Optical Coatings and Gratings
- Radiation Therapy and Dosimetry
- Heat transfer and supercritical fluids
- Particle Dynamics in Fluid Flows
- nanoparticles nucleation surface interactions
- Lightning and Electromagnetic Phenomena
- Atomic and Subatomic Physics Research
- Nuclear Engineering Thermal-Hydraulics
P.N. Lebedev Physical Institute of the Russian Academy of Sciences
2015-2024
Russian Academy of Sciences
2021-2023
Institute of Thermophysics
2020-2023
Fédération française de cardiologie
2021
Novosibirsk State University
2019-2020
A list of authors and their affiliations appears at the end paper New-particle formation is a major contributor to urban smog1,2, but how it occurs in cities often puzzling3. If growth rates particles are similar those found cleaner environments (1-10 nanometres per hour), then existing understanding suggests that new should be rapidly scavenged by high concentration pre-existing particles. Here we show, through experiments performed under atmospheric conditions CLOUD chamber CERN, below...
Faster than expected Iodine species are one of only a handful atmospheric vapors known to make new aerosol particles, which play central role in controlling the radiative forcing climate. He et al. report experimental evidence from CERN Cosmics Leaving Outdoor Droplets, or CLOUD, chamber demonstrating that iodic acid and iodous rapidly form particles can compete with sulfuric pristine regions. Science , this issue p. 589
The mechanistic pathway by which high relative humidity (RH) affects gas–particle partitioning remains poorly understood, although many studies report increased secondary organic aerosol (SOA) yields at RH. Here, we use real-time, molecular measurements of both the gas and particle phase to provide a understanding effect RH on biogenic oxidized molecules (from α-pinene isoprene) low temperatures (243 263 K) CLOUD chamber CERN. We observe increases in SOA mass 45 85% with increasing from...
Abstract. Highly oxygenated organic molecules (HOMs) contribute substantially to the formation and growth of atmospheric aerosol particles, which affect air quality, human health Earth's climate. HOMs are formed by rapid, gas-phase autoxidation volatile compounds (VOCs) such as α-pinene, most abundant monoterpene in atmosphere. Due their abundance low volatility, can play an important role new-particle (NPF) early aerosols, even without any further assistance other low-volatility sulfuric...
Abstract. In the present-day atmosphere, sulfuric acid is most important vapour for aerosol particle formation and initial growth. However, growth rates of nanoparticles (<10 nm) from remain poorly measured. Therefore, effect stabilizing bases, contribution ions impact attractive forces on molecular collisions are under debate. Here, we present precise rate measurements uncharged particles 1.8 to 10 nm, performed atmospheric conditions in CERN (European Organization Nuclear Research)...
Abstract New particle formation in the upper free troposphere is a major global source of cloud condensation nuclei (CCN) 1–4 . However, precursor vapours that drive process are not well understood. With experiments performed under tropospheric conditions CERN CLOUD chamber, we show nitric acid, sulfuric acid and ammonia form particles synergistically, at rates orders magnitude faster than those from any two three components. The importance this mechanism depends on availability ammonia,...
Dimethyl sulfide (DMS) influences climate via cloud condensation nuclei (CCN) formation resulting from its oxidation products (mainly methanesulfonic acid, MSA, and sulfuric H2SO4). Despite their importance, accurate prediction of MSA H2SO4 DMS remains challenging. With comprehensive experiments carried out in the Cosmics Leaving Outdoor Droplets (CLOUD) chamber at CERN, we show that decreasing temperature +25 to −10 °C enhances gas-phase production by an order magnitude OH-initiated...
The main nucleating vapor in the atmosphere is thought to be sulfuric acid (H2SO4), stabilized by ammonia (NH3). However, marine and polar regions, NH3 generally low, H2SO4 frequently found together with iodine oxoacids [HIOx, i.e., iodic (HIO3) iodous (HIO2)]. In experiments performed CERN CLOUD (Cosmics Leaving OUtdoor Droplets) chamber, we investigated interplay of HIOx during atmospheric particle nucleation. We that greatly enhances H2SO4(-NH3) nucleation through two different...
Abstract Iodine is a reactive trace element in atmospheric chemistry that destroys ozone and nucleates particles. emissions have tripled since 1950 are projected to keep increasing with rising O 3 surface concentrations. Although iodic acid (HIO ) widespread forms particles more efficiently than sulfuric acid, its gas-phase formation mechanism remains unresolved. Here, CLOUD simulation chamber experiments generate iodine radicals at atmospherically relevant rates, we show iodooxy hypoiodite,...
Abstract. Biogenic organic precursors play an important role in atmospheric new particle formation (NPF). One of the major precursor species is α-pinene, which upon oxidation can form a suite products covering wide range volatilities. Highly oxygenated molecules (HOMs) comprise fraction formed. While it known that HOMs contribute to secondary aerosol (SOA) formation, including NPF, they have not been well studied newly formed particles due their very low mass concentrations. Here we present...
Inhomogeneities in temperature and ammonia concentrations can cause rapid growth of nanoparticles polluted environments.
Illustration of how ammonium nitrate formation can cause rapid growth nucleating particles, increasing survival particles in polluted conditions.
Raising the ionisation rate (IR) increases ion concentration, but also amplifies losses due to ion–ion recombination, consequently diminishing formation of charged clusters at low HIO 3 concentrations.
The experimental results of film cooling effectiveness a wall gas jet injected through inclined cylindrical holes into transverse trench are presented. Measurements were carried out using IR thermography. embedded compared with the traditional well-known method injecting without trench. thermal efficiency is much higher when than corresponding value fed (the maximal more 3 times higher). particular advantage this coolant supply achieved at high injection parameters. our measurements and...
Highly oxygenated organic molecules (HOMs) are a major source of new particles that affect the Earth's climate. HOM production from oxidation volatile compounds (VOCs) occurs during both day and night can lead to particle formation (NPF). However, NPF involving vapors has been reported much more often daytime than nighttime. Here, we show nitrate radicals (NO3), which arise predominantly at night, inhibit monoterpenes based on three lines observational evidence: experiments in CLOUD (Cosmics...
Abstract. In the present-day atmosphere, sulfuric acid is most important vapour for aerosol particle formation and initial growth. However, growth rates of nanoparticles (
Abstract Highly oxygenated organic molecules (HOMs) are a major source of new particles affecting Earth’s climate 1,2 . HOM production from the oxidation volatile compounds (VOCs) occurs during both day and night, can lead to particle formation (NPF) 3,4 However, NPF involving vapors has been reported much more often daytime 3-6 than nighttime 7,8 Here, we show that nitrate radicals (NO 3 ) - which arise predominantly at night – inhibit monoterpenes based on three lines observational...
Abstract. Aerosol particles have an important role in Earth's radiation balance and climate, both directly indirectly through aerosol–cloud interactions. Most aerosol the atmosphere are weakly charged, affecting their collision rates with ions neutral molecules, as well by which they scavenged other cloud droplets. The rate coefficients between since determine growth lifetimes of charged particles, so may influence microphysics, dynamics, processing. However, despite importance, very few...
The future space experiment «Sun-Terahertz» is aimed at studying the Sun in unexplored terahertz range, obtaining new data on radiation of Sun, solar active regions and flares. scientific equipment being developed a set eight detectors sensitive to various frequencies range 0.4–12.0 THz. Golay cell optoacoustic receiver was used as element detectors. This paper examines problem changing sensitivity receivers this type when their own temperature changes (temperature effect). Using test bench...