Contact efflorescence as a pathway for crystallization of atmospherically relevant particles
Contact efflorescence as a pathway for crystallization of atmospherically relevant particles
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DOI：
10.1073/pnas.1522860113
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发表时间：
2015-12-29
影响因子：
11.1
通讯作者：
Tolbert, Margaret A.
中科院分区：
文献类型：
--
作者：
Davis, Ryan D.;Lance, Sara;Tolbert, Margaret A.
对大气颗粒物相态的了解不足是全球气候和空气质量模型不确定性的一个来源。吸湿性水性无机颗粒通常被认为在其整个大气寿命期间保持液体，或者由于风化的动力学限制（盐晶体从水溶液成核和生长）而仅在低相对湿度（RH）下（再）结晶。在这里，我们提出了一个以前未探索的异相成核途径，我们称之为“接触风化”，它描述了风化开始由一个外部定位的固体颗粒与表面接触的亚稳态水微滴。这项研究表明，在一个单一的碰撞，接触风化是一个途径，结晶大气相关的含水颗粒在高环境相对湿度（
Inadequate knowledge of the phase state of atmospheric particles represents a source of uncertainty in global climate and air quality models. Hygroscopic aqueous inorganic particles are often assumed to remain liquid throughout their atmospheric lifetime or only (re) crystallize at low relative humidity (RH) due to the kinetic limitations of efflorescence (salt crystal nucleation and growth from an aqueous solution). Here we present experimental observations of a previously unexplored heterogeneous nucleation pathway that we have termed "contact efflorescence," which describes efflorescence initiated by an externally located solid particle coming into contact with the surface of a metastable aqueous microdroplet. This study demonstrates that upon a single collision, contact efflorescence is a pathway for crystallization of atmospherically relevant aqueous particles at high ambient RH (