Heterogeneous Freezing of Carbon Nanotubes: A Model System for Pore Condensation and Freezing in the Atmosphere

被引：10

作者：

Alstadt, Valerie J. ^{[1
,2
]}

Dawson, Joseph Nelson ^{[1
]}

Losey, Delanie J. ^{[1
]}

Sihvonen, Sarah K. ^{[1
,3
]}

Freedman, Miriam Arak ^{[1
]}

机构：

[1] Penn State Univ, Dept Chem, University Pk, PA 16802 USA

[2] US Army, Edgewood Chem & Biol Ctr, Aberdeen Proving Ground, MD 21005 USA

[3] Syngenta, Greensboro, NC 27419 USA

来源：

JOURNAL OF PHYSICAL CHEMISTRY A | 2017年 / 121卷 / 42期

关键词：

ICE NUCLEATION; MINERAL DUST; WATER; SOOT; PARTICLES; AEROSOL; SITES;

D O I：

10.1021/acs.jpca.7b06359

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：

Heterogeneous ice nucleation is an important mechanism for cloud formation in the upper troposphere. Recently, pores on atmospheric particles have been proposed to play a significant role in ice nucleation. To understand how ice nucleation occurs in idealized pores, we characterized the immersion freezing activity of various sizes of carbon nanotubes. Carbon nanotubes are used both as a model for pores and proxy for soot particles. We determined that carbon nanotubes with inner diameters between 2 and 3 nm exhibit the highest ice nucleation activity. Implications for the freezing behavior of porous materials and nucleation on soot particles will be discussed.

引用

页码：8166 / 8175

页数：10

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