Description
Poster and Dinner and Drinks
Dr
Sylvain PICAUD
(Institut UTINAM - UMR 6213 CNRS/Univ Franche Comte)
10/01/2018, 18:10
Poster
The adsorption of all the fluorinated and chlorinated methane derivatives at the surface of Ih ice is studied by grand canonical Monte Carlo simulations at 200 K.
The adsorption isotherms are simulated and their shape is discussed in terms of the interplay of adhesive and cohesive interactions. It is found that in cases when the adhesive interaction is
clearly the stronger one, multilayer...
Thorsten Bartels-Rausch
(Paul Scherrer Institut)
10/01/2018, 18:10
Poster
Tropospheric ozone depletion events (ODEs) via halogen activation are observed in both cold and warm climates [1-3]. Very recently, it was suggested that this multiphase halogen activation chemistry is the dominates in the tropical and subtropical upper troposphere. These occurrences beg the question of temperature dependence of halogen activation in sea-salt aerosol, which are often mixtures...
Thorsten Bartels-Rausch
(Paul Scherrer Institut)
10/01/2018, 18:10
Poster
The pre-melting at the surface of ice crystals in surface snow or ice clouds has been proposed to explain a number of large-scale environmental effects ranging from electrification of thunder clouds and the scavenging of atmospheric trace gases to the flow of glaciers1. There is now general agreement on the appearance of this quasi-liquid layer (QLL) when temperatures approach the melting...
Dr
KITAE KIM
(Korea Polar Research institute(KOPRI))
10/01/2018, 18:10
Poster
Ice is one of the simplest crystalline materials on earth and plays various important roles on earth environmental system. Although enormous progress has been made in understanding on physics and chemistry of ice, we have still a large number of mysterious features on ice. In most cases, chemical reactions take place slowly when temperature drops according to Arrhenius Equation. However,...
Mr
Jialu Chen
(Institute of Low Temperature Science, Hokkaido University)
10/01/2018, 18:10
PICO talk
Surface melting of ice occurs below 0°C, and then ice surfaces are covered with quasi-liquid layers (QLLs). Our previous studies revealed that QLLs are formed kinetically on ice single crystals only in the temperature range higher than -2°C [1, 2]. However, other studies reported the appearances of QLLs even below -10°C [3]. To clarify the cause for this big discrepancy, in this study we...
Prof.
Yoshimichi Hagiwara
(Kyoto Institute of Technology)
10/01/2018, 18:10
Poster
The growth of frost crystals and frost layers on solid surfaces causes serious troubles, such as poor visibility through automobile windshields and a deterioration of the performance of heat exchanger in the air. Thus, the growth controls of frost crystals and frost layers are very important for reducing these troubles. Many experiments for these controls have been conducted using grooved...
Mr
Dae Wi Min
(POSTECH)
10/01/2018, 18:10
Poster
Understanding the chemical nature of humic substances is very important but the origin of humic substances in nature is not well known. Therefore, elucidating the mechanisms leading to the generation of humic substances in nature is of great interests. It is believed that humic substances are produced from the transformation of natural organic matters, like lignin, by biological pathways....
Dr
Hailong Li
(Max Planck Institute for Polymer Research)
10/01/2018, 18:10
Poster
Material properties of ground ice and permafrost strongly depend on the molecular scale structure and dynamics of the quasi-liquid premelting layer (qll) formed at ice/solid interfaces. Already in 1859, Faraday proposed the existence of a qll at ice surfaces. However, despite the extensive amount of research devoted to the understanding of interfacial ice melting, the structure of the qll...
Mr
Johannes Kirschner
(AMOLF)
10/01/2018, 18:10
Poster
The properties of small organic molecules at the ice/air interface are crucial for the understanding of fundamental processes in fields spanning from molecular physics to chemistry in the stratosphere. Here we use surface-specific heterodyne-detected vibrational sum-frequency generation spectroscopy (HD-VSFG) to investigate the molecular properties of ethanol at the air-water and the...
Ms
Carolyn Moll
(AMOLF)
10/01/2018, 18:10
Poster
Antifreeze proteins (AFPs) and Antifreeze Glycoproteins (AFGPs) collectively abbreviated as AF(G)Ps are a unique class of proteins that modify ice crystal growth and enable the survival of organism in freezing and subfreezing habitats. The molecular working mechanism behind AF(G)Ps freezing inhibition is not well understood, because, as yet, there are few experimental techniques that allow...
Mr
Norifumi Hara
(Department of Applied Chemistry, Meiji University, Japan)
10/01/2018, 18:10
Poster
In interstellar molecular clouds, various molecules (for instance, H2O, NH3, CO, CO2, and so on) are formed from elements such as H, C, O, and N [1]. Most of H2O exists as a thin shell of amorphous ice around dust grain. The molecules undergo chemical evolutions to organic molecules through various processes on the surface of amorphous ice [2]. Thus, the surface structure of amorphous ice is...
Dr
Michel J. ROSSI
(Paul Scherrer Institute (PSI))
10/01/2018, 18:10
Poster
Experiments have been performed using a multidiagnostic stirred-flow reactor (SFR) in which the gas- as well as the condensed phase have been simultaneously investigated under stratospheric temperatures in the range 175-200 K. Wall interactions of the title compounds have been taken into account using Langmuir adsorption isotherms in order to close the mass balance between deposited and...
Mr
Tadashi Kaijima
(Kyoto Institute of Technology)
10/01/2018, 18:10
Poster
The inhibition of ice growth is an important issue in various fields, such as the maintenance of the quality of food texture in food preservation, and cryosurgery. Antifreeze protein (AFP) and antifreeze glycoprotein (AFGP) have been investigated in relation to the inhibition of ice growth. This is because the AF(G)P solutions have the following properties: (a) the freezing point drops...
Prof.
Cheol Ho Choi
(Kyungpook National University)
10/01/2018, 18:10
Poster
With the help of our QM/EFP scheme, the adsorptions of Na+, F-, Br- and Cl- ions on Ih ice surface were theoretically studied. Drastically different adsorption behaviors depending on ion signs and surface heterogeneity were observed. The positive Na+ ion forms 4 ~ 5 Na+-O interfacial bondings regardless of the numbers of hydrogen dangling bonds (HDB), yielding consistent adsorptions with large...
Dr
Alexei Kiselev
(Karlsruhe Institute of Technology, Institute of Meteorology and Climate Research)
10/01/2018, 18:10
Poster
We report measurements of growth rates of ice crystals that were nucleating on feldspar mineral substrates in the environmental scanning electron microscope (ESEM) filled with the mixture of nitrogen and water vapor [3]. The linear growth velocity of prismatic and basal faces of ice crystals has been estimated from the sequence of individual ESEM frames recorded every second. Using the...
Dr
Jenee Cyran
(Max Planck Institute for Polymer Research)
10/01/2018, 18:10
Poster
Ice has significant effects on the climate and biogeochemical systems and plays a role in reactions known to contribute to ozone depletion and atmospheric pollution. Long range transport of hazardous pollutants, such as polycyclic aromatic hydrocarbons (PAHs), on ice contributes to the disruption of these biogeochemical systems. PAHs and their derivatives from photolysis are known to be...
Mr
Masahiro Inomata
(Institute of Low Temperature Science, Hokkaido University)
10/01/2018, 18:10
PICO talk
Ice is one of the most abundant materials on the earth. Hence, crystal growth of ice governs a wide variety of phenomena in nature. For example, most rains fallen outside tropical regions are formed by the melting of ice crystals (snowflakes) that were grown in the sky and then descended to the ground [1]. Therefore, to understand the growth kinetics of ice crystals is extremely important....
Dr
Jennie Thomas
(LATMOS/UCLA)
10/01/2018, 18:10
Poster
The cold regions on Earth are undergoing significant climate change. Yet many underlying chemical, biological, and physical processes and feedbacks are still poorly understood strongly motivating continued research in cold regions. Such research inherently requires cooperation among researchers and programs across national boundaries to achieve science objectives. CATCH is an emerging activity...
Dr
Ian Baker
(Dartmouth College)
10/01/2018, 18:10
Poster
It is well established that the Earth’s large continental ice sheets contain a variety of naturally occurring impurities, both soluble and insoluble. Understanding how these impurities affect the rheology, intrinsic thermodynamic properties, and fate of these ice sheets is much less understood. To investigate the effects that trace amounts of H2SO4 have on the flow and ductility of...
Mr
Mario Nachbar
(Institute of Environmental Physics, University of Heidelberg)
10/01/2018, 18:10
Poster
Heterogeneous H2O nucleation studies below 150K are rare, but important to understand the formation of cold ice clouds in terrestrial atmospheres, e.g. polar mesospheric clouds on Earth or water ice clouds on Mars. We use a time-of-flight mass spectrometer to study H2O adsorption, critical saturation and subsequent growth on sub 4nm iron oxide and silica particles levitated in a modified ion...
Dr
Denis Duft
(Institute for Meteorology and Climate Research, Karlsruhe Institute of Technology, Karlsruhe, Germany)
10/01/2018, 18:10
Poster
It is known that at ambient pressure the crystallization of amorphous ices proceeds via the formation of nano-crystallites. This fact, however, is not considered in many studies on amorphous and crystalline ices formed from the amorphous phase even though it has important implications on various ice properties. As an example, we show in this contribution, that the saturation vapor pressure...
156.
Towards the surface science of ice nucleation on aqueous organic solutions and solid substrates
Mr
HUANYU YANG
(Paul Scherrer Institut)
10/01/2018, 18:10
Poster
The nucleation of ice is an important process in chemistry, physics and atmospheric science. Although ice nucleation has been studied since long, our understanding of ice nucleation is still far from complete, particularly from a molecular point of view. The hydrogen bonding structure of H2O ice can be significantly different between liquid water to ice, which is responsible for most of the...
Dr
Sønke Maus
(Norwegian University of Science and Technology (NTNU))
10/01/2018, 18:10
Poster
Percolation theory describes the properties of a large number of objects related to their connectivity. The spreading of fluid through a porous medium is, among other applications, a percolation process that was first described by Broadbent and Hammersley (1) in terms of percolation theory. During the past decades this theory has been formulated and many different applications, like forest...
Ms
Prerna Sudera
(PhD student)
10/01/2018, 18:10
Poster
The surface of ice is relevant for various important phenomena including glacier sliding, and (photo-) chemical conversion of molecules on that surface.
For chemical reactions occurring on the ice surface, the dynamics of the surface water molecules and energy flow pathways play an important role: following a chemical reaction, the rate of excess energy dissipation determines the...
