Unexpected concentration dependence of the mass accommodation coefficient of water on aqueous triethylene glycol droplets.

The mass accommodation coefficient αM of water on aqueous triethylene glycol droplets was determined for water mole fractions in the range xmol = 0.1-0.93 and temperatures between 21 and 26 °C from modulated Mie scattering measurement on single optically-trapped droplets in combination with a kinetic multilayer model. αM reaches minimum values around 0.005 at a critical water concentration of xmol = 0.38, and increases with decreasing water content to a value of ≈0.1 for almost pure triethylene glycol droplets, essentially independent of the temperature. Above xmol = 0.38, αM first increases with increasing water content and then stabilises at a value of ≈0.1 at the lowest temperatures, while at the highest temperature its value remains around 0.005. We analysed the unexpected concentration and temperature dependence with a previously proposed two-step model for mass accommodation which provides concentration and temperature-dependent activation enthalpies and entropies. We suggest that the unexpected minimum in αM at intermediate water concentrations might arise from a more or less saturated hydrogen-bond network that forms at the droplet surface.

Women in Natural Sciences (WiNS) at ETH Zurich Celebrates its 10th Anniversary - A Retrospective and Outlook.

For this CHIMIA special issue on the United Nations Sustainable Development Goals (SDGs) and the coincidental 10th anniversary of the association of Women in Natural Sciences (WiNS) at ETH Zurich, there is no better opportunity to share what we have achieved in the last decade. WiNS was originally founded by female PhD students and PostDocs at the Department of Chemistry and Applied Biosciences (D-CHAB) and has expanded to include three additional departments at ETH Zurich. Join us in celebrating our anniversary, reflecting on what we and other associations with the same mission have done to promote gender equality and reduced inequalities for all. We invite you to reflect on what yet has to be done to enact a systemic change towards achieving equal opportunities for all, rather than simply accommodating the female perspective to Switzerland's predominantly masculine working culture.