Aerosol size standards in the nanometer size range II. Narrow size distributions of polystyrene 3-11 nm in diameter

被引:16
作者
Ude, S
de la Mora, JF
Alexander, JN
Saucy, DA
机构
[1] Yale Univ, Mech Dept, New Haven, CT 06520 USA
[2] Yale Univ, Dept Chem Engn, New Haven, CT 06520 USA
[3] Rohm & Haas Co, Spring House, PA 19477 USA
关键词
standard; mass spectrometry; electrical mobility; spherical; aerosol; nanoparticle;
D O I
10.1016/j.jcis.2005.06.052
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
A technique for generating charged aerosols of polystyrene (pSty) with narrow size distributions has been developed. It is based on electrospraying commercial narrow mass standards of pSty dissolved in 1-methyl-2-pyrrolidone (NMP) seeded with the newly synthesized salt dimethyl ammonium formate. This salt imparts a much larger electrical conductivity than previously known NMP electrolytes, leading to higher quality sprays with greatly reduced attachment of impurities. Controlling the solute concentration enables forming polystyrene particles containing from one up to more than ten single polystyrene molecules, whereby 4 mass standards with molecular weights from 9200 up to 96,000 g/mol yield particles covering densely the diameter range from 3 to 11 nm. Combined mobility and mass measurement with a differential mobility analyzer and a mass spectrometer in tandem are carried out with a pSty sample 9200 amu in molecular weight. They fix directly the mass versus mobility relation near 9200 amu, and indirectly for the other standards and their clusters. The apparent particle density resulting from mobility versus mass data agrees with the bulk density of the polymer, indicating that the particles are dense and spherical. Although these standards have been studied only in gaseous suspension, their injection in liquids such as water where pSty is insoluble should keep them spherical. (c) 2005 Elsevier Inc. All rights reserved.
引用
收藏
页码:384 / 393
页数:10
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