English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

The ability of sub-micron-sized organic acid particles to act as cloud condensation nuclei(CCN) has been examined at room temperature using a newly constructed continuous-flow, thermal-gradientdiffusion chamber (TGDC).  The organic acids studied were: oxalic, malonic, glutaric, oleic andstearic. The CCN properties of the highly soluble acids - oxalic, malonic and glutaric- match very closely Köhler theory predictions which assume full dissolution of the dry particle and a surfacetension of the growing droplet equal to that of water.  In particular, for supersaturations between 0.3and 0.6, agreement between the dry particle diameter which gives 50% activation and that calculatedfrom Köhler theory is to within 3nm on average.  In the course of the experiments, considerableinstability of glutaric acid particles was observed as a function of time and there is evidence that theyfragment to some degree to smaller particles. Stearic acid and oleic acid, which are both highlyinsoluble in water, did not activate at supersaturations of 0.6% with dry diameters up to140nm. Finally, to validate the performance of the TGDC, we present results for the activation of ammoniumsulfate particles that demonstrate good agreement with Köhler theory if solution non-ideality isconsidered.  Our findings support earlier studies in the literature that showed highly soluble organics tobe CCN active but insoluble species to be largely inactive

Organic acids as cloud condensation nuclei: Laboratory studies of highly soluble and insoluble species