ISAC

ISAC is a medium sized indoor simulation chamber which has been developed specifically to investigate interfaces processes such as air-water-air, air-sol,…, interfaces. It is made of a 2m³ Teflon envelop embedded in a structure containing the irradiation system UV and visible light sources. On the floor of the chamber sits a tank which can be filled with any liquid/material/chemicals. The liquid filling and emptying can be done without opening the chamber. The cuboid shape of the chamber allows people to enter by a door to manually scrub the walls and the tank allowing to minimize the memory effects of the chamber. 
Samples can be taken at 2 different heights to measure concentration gradients in the chamber. The analytical devices permanently connected to the chamber are gas phase monitors (O₃, CO, NO_x at pptv level), particle size distribution measured by SMPS and SRI-TOF-MS for VOC analysis. 
Water from the tank can be analysed by UPLC-HR-MS and by Ion Chromatography. A more advanced characterization of the particulate matter can be achieved online with AMS or offline by sampling and chemical analysis by UPLC-HR-MS and TEM/EDX measurements. 
Even more advanced analysis on particles can be conducted on the Ly-EtTEM microscope which allows to work under a controlled atmosphere until 20 mbar. 

The chamber now well characterized allows the study of interfacial processes and especially liquid/gas interactions. It is equipped with the most advanced analytical equipment to investigate both gas and liquid phases. Morphological characterisation of the particulate matter formed in the chamber and its behaviour when exposed to gases can be studied with Environmental TEM. This instrument is quasi unique in Europe as it allows precise determination of exchanges at macroscopic interfaces.
The research engineer will teach how to use the chamber and will ensure that the experiments are run in an optimal way.

5 days allows to run a blank experiment, a “real” experiment and the collection of the particulate matter samples. These 5 days of experiment include half a day of work on the E-TEM. A study with variable parameters will require 4 weeks of experiments

Users from academic sector (expert and young researchers), SMEs

Sébastien Perrier, research engineer, sebastien.perrier@ircelyon.univ-lyon1.fr

ISAC is a parallelepiped rectangle teflon chamber. The temperature is not controlled but regulated by the air of the laboratory which is air conditioned.

S/V ratio:  5m-1
dimensions: 1x1x2 m
Temperature range: 20-25 °C
Pressure range: atmospheric pressure
RH range: 0-90%
Projected surface area: 48 m²

1m side length and 2m height. Volume is 2 m3.

Alpert P, Ciuraru R, Rossignol S, Passananti M, Tinel L, Perrier S, Dupart Y, Steimer S, Ammann M, Donaldson D, George C : Fatty Acid Surfactant Photochemistry Results in New Particle Formation. Scientific reports 2017 n°7. DOI ref : 10.1038/s41598-017-12601-2. Hal ref : hal-01625639