نتایج جستجو برای: Hygroscopicity

تعداد نتایج: 787  

2016
Baha I. Elzaki Yue Jun Zhang

Using ammonium nitrate (AN) as a propellant oxidizer is limited due to its hygroscopicity. This review consolidated the available information of various issues pertaining to the coating methods of the surface modification of ammonium nitrate for reducing its hygroscopicity. Moreover this review summarizes the recent advances and issues involved in ammonium nitrate surface modification by physic...

2006
S. M. Kreidenweis M. D. Petters

Introduction Conclusions References Tables Figures Back Close Full Screen / Esc Abstract Introduction Conclusions References Tables Figures Back Close Full Screen / Esc Printer-friendly Version Interactive Discussion EGU Abstract We present a method to describe the relationship between dry particle diameter and cloud condensation nuclei (CCN) activity using a single hygroscopicity parameter. Va...

2010
H. Su D. Rose Y. F. Cheng S. S. Gunthe

This paper presents a general concept and mathematical framework of particle hygroscopicity distribution for the analysis and modeling of aerosol hygroscopic growth and cloud condensation nucleus (CCN) activity. The cumulative distribution function of particle hygroscopicity, H(κ,Dd) is defined as the number fraction of particles with a given dry diameter, Dd, and with an effective hygroscopici...

2007
M. D. Petters

We present a method to describe the relationship between particle dry diameter and cloud condensation nuclei (CCN) activity using a single hygroscopicity parameter κ . Values of the hygroscopicity parameter are between 0.5 and 1.4 for highly-CCN-active salts such as sodium chloride, between 0.01 and 0.5 for slightly to very hygroscopic organic species, and 0 for nonhygroscopic components. Obser...

2015
K. M. Cerully A. Bougiatioti J. R. Hite H. Guo L. Xu N. L. Ng R. Weber A. Nenes

The formation of secondary organic aerosols (SOAs) combined with the partitioning of semivolatile organic components can impact numerous aerosol properties including cloud condensation nuclei (CCN) activity, hygroscopicity, and volatility. During the summer 2013 Southern Oxidant and Aerosol Study (SOAS) field campaign in a rural site in the southeastern United States, a suite of instruments inc...

2011
A. Bougiatioti A. Nenes C. Fountoukis N. Kalivitis S. N. Pandis N. Mihalopoulos

We present size-segregated measurements of cloud condensation nucleus (CCN) activity of aged aerosol sampled at Finokalia, Crete, during the Finokalia Aerosol Measurement Experiment of summer 2007 (FAME07). From analysis of the data, hygroscopicity and activation kinetics distributions are derived. The CCN are found to be highly hygroscopic, (expressed by a sizeand timeaveraged hygroscopicity p...

Journal: :Environmental science & technology 2009
Kihong Park Jae-Seok Kim Seung Ho Park

The tandem differential mobility analyzer (TDMA) technique was applied to determine the hygroscopicity and volatility of atmospheric ultrafine particles in three sites of urban Gwangju, industrial Yeosu, and coastal Taean in South Korea. A database for the hygroscopicity and volatility of the known compositions and sizes of the laboratory-generated particles wasfirst constructed for comparison ...

Journal: :Applied optics 2009
Jegathisvaran Balakrishnan Bernd M Fischer Derek Abbott

We present the hygroscopicity of polymer and copolymer materials in the low terahertz (THz) frequency range using a linear absorption model. We identify COC 6013 and COC 5013 as optimal THz window materials, possessing both low hygroscopicity and high transmission in the THz regime. The correct choice of window material is of significance for transmission THz spectroscopy and of particular inte...

2014

This paper presents measurements of size resolved and total CCN concentrations as well as aerosol composition and hygroscopicity from the high-alpine site Jungfraujoch. The authors do a good job of presenting the measurements and results and their data should contribute to the growing understanding of global aerosol hygroscopicity. However, there are a few changes which would improve the paper ...

2008
A. A. Zardini S. Sjogren C. Marcolli U. K. Krieger M. Gysel E. Weingartner U. Baltensperger

Atmospheric aerosols are often mixtures of inorganic and organic material. Organics can represent a large fraction of the total aerosol mass and are comprised of water-soluble and insoluble compounds. Increasing attention was paid in the last decade to the capability of mixed inorganic/organic aerosol particles to take up water (hygroscopicity). We performed hygroscopicity measurements of inter...

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