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Measurements Of The Chemical Physical And Optical Properties Of Single Aerosol Particles
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Book Synopsis Measurements of the Chemical, Physical, and Optical Properties of Single Aerosol Particles by : Ryan Christopher Moffet
Download or read book Measurements of the Chemical, Physical, and Optical Properties of Single Aerosol Particles written by Ryan Christopher Moffet and published by . This book was released on 2007 with total page 340 pages. Available in PDF, EPUB and Kindle. Book excerpt: Knowledge of aerosol physical, chemical, optical properties is essential for judging the effect that particulates have on human health, climate and visibility. The aerosol time-of-flight mass spectrometer (ATOFMS) is capable of measuring, in real-time, the size and chemical composition of atmospheric aerosols. This was exemplified by the recent deployments of the ATOFMS to Mexico City and Riverside. The ATOFMS provided rapid information about the major particle types present in the atmosphere. Industrial sources of particles, such as fine mode particles containing lead, zinc and chloride were detected in Mexico City. The rapid time response of the ATOFMS was also exploited to characterize a coarse particle concentrator used in human health effects studies. The ATOFMS showed the ability to detect changes in particle composition with a time resolution of 15 min during short 2 hour human exposure studies.
Author :Alexander A. Kokhanovsky Publisher :Springer Science & Business Media ISBN 13 :3540499091 Total Pages :154 pages Book Rating :4.5/5 (44 download)
Book Synopsis Aerosol Optics by : Alexander A. Kokhanovsky
Download or read book Aerosol Optics written by Alexander A. Kokhanovsky and published by Springer Science & Business Media. This book was released on 2008-03-18 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt: This new text offers experienced students a comprehensive review of available techniques for the remote sensing of aerosols. These small particles influence both atmospheric visibility and the thermodynamics of the atmosphere. They are also of great importance in any consideration of climate change problems. Aerosols may also be responsible for the loss of harvests, human health problems and ecological disasters. Thus, this detailed study of aerosol properties on a global scale could not be more timely.
Book Synopsis Optical Properties of Mineral Dust Aerosol Including Analysis of Particle Size, Composition, and Shape Effects, and the Impact of Physical and Chemical Processing by : Jennifer Mary Alexander
Download or read book Optical Properties of Mineral Dust Aerosol Including Analysis of Particle Size, Composition, and Shape Effects, and the Impact of Physical and Chemical Processing written by Jennifer Mary Alexander and published by . This book was released on 2015 with total page 195 pages. Available in PDF, EPUB and Kindle. Book excerpt: Atmospheric mineral dust has a large impact on the earth's radiation balance and climate. The radiative effects of mineral dust depend on factors including, particle size, shape, and composition which can all be extremely complex. Mineral dust particles are typically irregular in shape and can include sharp edges, voids, and fine scale surface roughness. Particle shape can also depend on the type of mineral and can vary as a function of particle size. In addition, atmospheric mineral dust is a complex mixture of different minerals as well as other, possibly organic, components that have been mixed in while these particles are suspended in the atmosphere. Aerosol optical properties are investigated in this work, including studies of the effect of particle size, shape, and composition on the infrared (IR) extinction and visible scattering properties in order to achieve more accurate modeling methods. Studies of particle shape effects on dust optical properties for single component mineral samples of silicate clay and diatomaceous earth are carried out here first. Experimental measurements are modeled using T-matrix theory in a uniform spheroid approximation. Previous efforts to simulate the measured optical properties of silicate clay, using models that assumed particle shape was independent of particle size, have achieved only limited success. However, a model which accounts for a correlation between particle size and shape for the silicate clays offers a large improvement over earlier modeling approaches. Diatomaceous earth is also studied as an example of a single component mineral dust aerosol with extreme particle shapes. A particle shape distribution, determined by fitting the experimental IR extinction data, used as a basis for modeling the visible light scattering properties.
Book Synopsis Physical and Chemical Properties of Aerosols by : Ian Colbeck
Download or read book Physical and Chemical Properties of Aerosols written by Ian Colbeck and published by Springer. This book was released on 1998 with total page 488 pages. Available in PDF, EPUB and Kindle. Book excerpt: An aerosol is a suspension of fine particles in a gas, usually air, and is generally taken to include both solid and liquid particles with dimensions ranging from a few nanometres up to around 100 micrometres in diameter. Aerosol sicence is the study of the physics and chemistry of aerosol behaviour and this includes techniques of generating particles of nanometre and micrometre dimensions: size classification and measurement, transport and deposition properties: chemical properties of aerosols in the atmosphere and in industry, as well as health effects from inhalation and industrial gas cleaning technology. Aerosols have important commercial implications, e.g. pressure-packaged `aerosol' products, agricultural sprays, atmospheric visibility and high technology materials and knowledge of aerosol properties is important in a wide range of disciplines, including industrial hygiene, air pollution, medicine, agriculture, meteorology and geochemistry. Written by an international team of contributors, this book forms a timely, concise and accessible overview of aerosol science and technology. Chemists, technologists and engineers new to aerosol science will find this book an essential companion in their studies of the subject. Those more familiar with aerosols will use it as an essential source of reference.
Book Synopsis Characterization of the Physical, Chemical, and Optical Properties of Atmospheric Aerosol Particles in New Hampshire by : John F. Slater
Download or read book Characterization of the Physical, Chemical, and Optical Properties of Atmospheric Aerosol Particles in New Hampshire written by John F. Slater and published by . This book was released on 2002 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Fundamentals and Applications in Aerosol Spectroscopy by : Ruth Signorell
Download or read book Fundamentals and Applications in Aerosol Spectroscopy written by Ruth Signorell and published by CRC Press. This book was released on 2010-12-20 with total page 513 pages. Available in PDF, EPUB and Kindle. Book excerpt: Helping you better understand the processes, instruments, and methods of aerosol spectroscopy, Fundamentals and Applications in Aerosol Spectroscopy provides an overview of the state of the art in this rapidly developing field. It covers fundamental aspects of aerosol spectroscopy, applications to atmospherically and astronomically relevant problem
Book Synopsis Optical Effects Associated with Small Particles by : Peter W. Barber
Download or read book Optical Effects Associated with Small Particles written by Peter W. Barber and published by World Scientific. This book was released on 1988 with total page 362 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume is a collection of review articles by scientists who have pioneered many of the recent advances in studies of the optical effects of small particles. The book begins with a review of the multitude of sharp dielectric resonances which exist in all optical spectra as a result of particle size and shape. Latest advances in absorption and fluorescence spectroscopy of a single particle and/or an ensemble of particles are also discussed, as well as advances in the energy transfer mechanisms for molecules embedded in the particle. The effects of laser-induced heating on a single particle are reviewed in terms of the hydrodynamics and thermodynamics of the liquid droplet and its ambient gas surrounding. The limits of applying bulk optical constants to small particles which lie between the bulk substance and the quantum-sized substance are also presented.
Book Synopsis Atmospheric Aerosols: Their Optical Properties and Effects by :
Download or read book Atmospheric Aerosols: Their Optical Properties and Effects written by and published by . This book was released on 1976 with total page 348 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Investigation of Aerosol Optical and Chemical Properties Using Humidity Controlled Cavity Ring-Down Spectroscopy by :
Download or read book Investigation of Aerosol Optical and Chemical Properties Using Humidity Controlled Cavity Ring-Down Spectroscopy written by and published by . This book was released on 2017 with total page 113 pages. Available in PDF, EPUB and Kindle. Book excerpt: Scientists have been observing a change in the climate since the beginning of the 20th century that cannot be attributed to any of the natural influences of the past. Natural and anthropogenic substances and processes perturb the Earth's energy budget, contributing to climate change. In particular, aerosols (particles suspended in air) have long been recognized to be important in processes throughout the atmosphere that affect climate. They directly influence the radiative balance of the Earth's atmosphere, affect cloud formation and properties, and are also key air pollutants that contribute to a variety of respiratory and cardiovascular diseases. Despite their importance, aerosol particles are less well-characterized than greenhouse gases with respect to their sources, temporal and spatial concentration distribution, and physical and chemical properties. This uncertainty is mainly caused by the variable and insufficiently understood sources, formation and transformation processes, and complex composition of atmospheric particles. Instruments that can precisely and accurately measure and characterize the aerosol physical and chemical properties are in great demand. Atmospheric relative humidity (RH) has a crucial impact on the particles' optical properties; the RH dependence of the particle extinction coefficient is an important parameter for radiative forcing and thus climate change modeling. In this work a Humidity-Controlled Cavity Ring-Down (HC-CRD) aerosol optical instrument is described and its ability to measure RH dependent extinction coefficients and related hygroscopicity parameters is characterized.
Book Synopsis Aerosol Technology by : William C. Hinds
Download or read book Aerosol Technology written by William C. Hinds and published by . This book was released on 1982-07-27 with total page 458 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aerosol Technology, Second Edition also features dozens of new, fully worked examples drawn from a wide range of industrial and research settings, plus new chapter-end practice problems to help readers master the material quickly.
Book Synopsis Aerosol Optical Properties by : Mariya M. Shcherbyna
Download or read book Aerosol Optical Properties written by Mariya M. Shcherbyna and published by . This book was released on 2006 with total page 350 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Refractive Index of Single Aerosol Particles by : Alison Bain
Download or read book The Refractive Index of Single Aerosol Particles written by Alison Bain and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "Aerosol is ubiquitous in our atmosphere, yet still poses great uncertainty to climate models. Central to accurate predictions of aerosol radiative forcing is an accurate description of the scattering and absorption of solar radiation by aerosol, which can be described by the complex refractive index (RI). The RI of aerosol depends on the wavelength of incident light and the temperature as well as its chemical composition. In the atmosphere, aerosol may contain a number of different organic and inorganic components. Furthermore, as aerosol is transported though the atmosphere and encounters air of varying relative humidity its water content will change to remain at equilibrium with its surroundings. All of these factors must be taken into consideration in order to accurately determine the RI of atmospheric aerosol.The RI of single, optically trapped particles can be determined through the collection and fitting of Mie scattered light. By monitoring optically trapped particles it is possible to mimic atmospheric conditions. Importantly for investigating the RI of aerosol, single particle experiments allow for the characterization of supersaturated states not accessible through bulk measurements. Throughout this thesis, the refractive indices of various aerosol types are determined using optical trapping methods.First, in order to find the most accurate method of determining the RI of aerosol, retrieval using the morphology-dependent resonances (MDRs) in the Mie scattering spectrum is compared to phase function fitting. Using the MDRs is found to be more accurate and less computationally demanding than phase function fitting. MDRs and the Mie scattering spectrum are then used throughout the rest of this thesis to determine the optical properties of aerosol.Next, the optical properties of absorbing particles are investigated. Single, absorbing particles are held in a photophoretic trap, illuminated with a broadband light source and the broadband Mie scattering spectrum is collected. Here, the full Mie scattering spectrum is fit using Lorentzian oscillators to describe the absorption features observed as scattering minima in the spectra. Using the causal relationship between the real and imaginary parts of the RI described by the Kramers-Kronig relation, the wavelength-dependent complex RI is determined for these particles.The complex RI of weakly absorbing particles is then considered. Using cavity-enhanced Raman spectroscopy, while slowly heating the particle by increasing the trapping beam power, both the real and imaginary parts of the RI of several aqueous solutions whose optical properties are relevant to aqueous sea-salt particles and aqueous organic aerosol are measured. The far-UV transitions that give rise to the RI in the visible region for weak absorbers is modeled with an effective Lorentzian oscillator. The effective oscillator model accurately describes both the real and imaginary parts of the RI of aqueous solutions across a wide range of water activities and optical wavelengths. It is shown that mixing rule calculations utilizing oscillator parameters from solutions containing a single solute and water can be used to predict the optical properties of aqueous solutions containing multiple solutes.Finally, this model is extended to consider the contributions of individual ions to theRI of aerosol. Since the absorption of weakly absorbing aerosol is small and is often neglected, broadband scattering is utilized to determine only the real part of the refractiveindex. The oscillator parameters determined for ions accurately predict the RI as a function of both water content and wavelength for aqueous salts and strong acids.Furthermore, the RI of ternary organic-inorganic mixtures using these oscillatorparameters agree with experimentally determined refractive indices. In addition, the effectof temperature on RI within the framework of the effective oscillator modelis also explored"--
Book Synopsis Aerosol Measurement by : Pramod Kulkarni
Download or read book Aerosol Measurement written by Pramod Kulkarni and published by John Wiley & Sons. This book was released on 2011-09-09 with total page 1497 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aerosol Measurement: Principles, Techniques, and Applications Third Edition is the most detailed treatment available of the latest aerosol measurement methods. Drawing on the know-how of numerous expert contributors; it provides a solid grasp of measurement fundamentals and practices a wide variety of aerosol applications. This new edition is updated to address new and developing applications of aerosol measurement, including applications in environmental health, atmospheric science, climate change, air pollution, public health, nanotechnology, particle and powder technology, pharmaceutical research and development, clean room technology (integrated circuit manufacture), and nuclear waste management.
Book Synopsis Aerosol Technology by : William C. Hinds
Download or read book Aerosol Technology written by William C. Hinds and published by John Wiley & Sons. This book was released on 2012-12-06 with total page 411 pages. Available in PDF, EPUB and Kindle. Book excerpt: The #1 guide to aerosol science and technology -now better than ever Since 1982, Aerosol Technology has been the text of choice among students and professionals who need to acquire a thorough working knowledge of modern aerosol theory and applications. Now revised to reflect the considerable advances that have been made over the past seventeen years across a broad spectrum of aerosol-related application areas - from occupational hygiene and biomedical technology to microelectronics and pollution control -this new edition includes: * A chapter on bioaerosols * New sections on resuspension, transport losses, respiratory deposition models, and fractal characterization of particles * Expanded coverage of atmospheric aerosols, including background aerosols and urban aerosols * A section on the impact of aerosols on global warming and ozone depletion. Aerosol Technology, Second Edition also features dozens of new, fully worked examples drawn from a wide range of industrial and research settings, plus new chapter-end practice problems to help readers master the material quickly.
Book Synopsis Aerosol Hygroscopic Properties by : Danielle El Hajj
Download or read book Aerosol Hygroscopic Properties written by Danielle El Hajj and published by . This book was released on 2019 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Aerosols play vital roles in energy balance of the Earth and also have a significant impact on human health. The last assessment report by the Intergovernmental Panel on Climate Change (IPCC), states that the uncertainty in the total radiative forcing is mainly dominated by the high uncertainty in the aerosol radiative forcing. This is mainly caused by the poorly understood and quantified aerosol effects. Indeed, high relative humidity (RH), promotes water uptake by atmospheric aerosol particles, which modifies their size, morphology and chemical composition and therefore their optical properties. In-situ measurements of aerosols properties (scattering and absorption coefficients, size distribution) are usually performed at dry conditions (RH
Book Synopsis In-Situ Measurements of Optical Properties of Atmospheric Aerosol Particles Using the Georgia Tech Laser Polar Nephelometer by : Gerald William Grams
Download or read book In-Situ Measurements of Optical Properties of Atmospheric Aerosol Particles Using the Georgia Tech Laser Polar Nephelometer written by Gerald William Grams and published by . This book was released on 1979 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Measurement of Quantitative IR Properties of Single Aerosol Particles With Emphasis on Biological and Chemical Stimulants by :
Download or read book Measurement of Quantitative IR Properties of Single Aerosol Particles With Emphasis on Biological and Chemical Stimulants written by and published by . This book was released on 2004 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: The angular scattering pattern of theta and Phi is sensitive to a particle's morphology (size, shape, refractive index, and surface structure). We have demonstrated that the angular pattern of the scattered light is also dependent on the absorptive pan of the particle. Using numerical simulations, based on Mie's theory, we found that absorption leads to an increase in the peak-to-valley ratio in the angular scattering pattern.
