Issue 46, 2011

Neutron diffraction study of water freezing on aircraft engine combustor soot

Abstract

The study of the formation of condensation trails and cirrus clouds on aircraft emitted soot particles is important because of its possible effects on climate. In the present work we studied the freezing of water on aircraft engine combustor (AEC) soot particles under conditions of pressure and temperature similar to the upper troposphere. The microstructure of the AEC soot was found to be heterogeneous containing both primary particles of soot and metallic impurities (Fe, Cu, and Al). We also observed various surface functional groups such as oxygen-containing groups, including sulfate ions, that can act as active sites for water adsorption. Here we studied the formation of ice on the AEC soot particles by using neutron diffraction. We found that for low amount of adsorbed water, cooling even up to 215 K did not lead to the formation of hexagonal ice. Whereas, larger amount of adsorbed water led to the coexistence of liquid water (or amorphous ice) and hexagonal ice (Ih); 60% of the adsorbed water was in the form of ice Ih at 255 K. Annealing of the system led to the improvement of the crystal quality of hexagonal ice crystals as demonstrated from neutron diffraction.

Graphical abstract: Neutron diffraction study of water freezing on aircraft engine combustor soot

Article information

Article type
Paper
Submitted
08 Apr 2011
Accepted
19 Sep 2011
First published
14 Oct 2011

Phys. Chem. Chem. Phys., 2011,13, 20729-20735

Neutron diffraction study of water freezing on aircraft engine combustor soot

V. Tishkova, B. Demirdjian, D. Ferry and M. Johnson, Phys. Chem. Chem. Phys., 2011, 13, 20729 DOI: 10.1039/C1CP21109A

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements