CO2 snow with 1.5% H2O ice | GhoSST

Sample

Name: CO2 snow with 1.5% H2O ice

Owner of sample

Database

GhoSST

Experimentalists

Origin of sample

Date: 2015-01-01
Provider: IPAG

Image

sample of

C O_{2}

$CO_2$ snow mixed with 1.5%

H_{2} O

$H_2O$ ice (initial state t1) [Philippe 1996]

Physical characteristics

Thickness: 60.5 $\pm$ 2.5 $mm$
Diameter: 80.0 $mm$
Volume: 312000.0 $mm^3$
Sample changes: $CO_2$ sublimation: initial sample
Substrate material: cooper
Substrate comments: cylindrical 80mm diameter, 60mm deep
Comments: the CO2+H2O mixture is deposited over 5mm of martian analogue dust

Sample environment: Temperature

Temperature: 148.15 $\pm$ 0.5 $K$

Sample environment: Fluid

Type

molecular gas

Fluids

$CO_2$ 100.0 %

Fluid temperature

148.15

\pm

$\pm$ 0.5

K

$K$

Fluid pressure

6.47

\pm

$\pm$ 0.03

m b a r

$mbar$

Documentation and publication

Publications

Philippe, 2016, 1 - 379

Layers in sample

Number

Arrangement

CO2+H2O snow mixture deposited over a 5 mm thick flat layer of martian analogue dust

Layers

H2O ice , 0.5 $mm$
CO2 snow with 1.5% H2O ice , 55.0 $mm$
Volcanic tuff , 5.0 $mm$

Sample processings

Title

preparation of a mixture of H2O ice and CO2 snow

Precursors

Matters

Produced sample

Sample

CO2 snow with 0.10% of a PAH mix

Processing steps

Step	Chronology	Date	Type	Process	Changes
#1	before layer formation	2015-01-01	mechanical	grinding a monocrystal of H2O ice in cold chamber (-4°C)	powdered H2O ice
#2	before layer formation	2015-01-01	mechanical	sieving powdered H2O ice between 250 and 280µm sieves in cold chamber (-4°C)	250-280µm powdered H2O ice
#3	before layer formation	2015-01-01	fluid physical	solidification of liquid CO2 droplets by decompression from a CO2 bottle with plunger within the SnowPack (R) device	formation of a dense pellet (312.5 cm3) of $CO_2$ snow
#4	before layer formation	2015-01-01	mechanical	grinding CO2 snow	150µm powdered $CO_2$ snow (contain minor amount of H2O frost: ~0.03%)
#5	before layer formation	2015-01-01	mixing	mixing a weighted amount of sieved H2O ice with CO2 snow	mixture of CO2 snow and H2O ice (weighted to determine the H2O mass fraction: 1.5%)
#6	during layer formation	2015-01-01	layer formation	filling the CarboN-IR cell at -125°C with 5mm of volcanic tuff plus some manual surface flattening	flat homogeneous 5mm thick volcanic tuff layer (grains <25µm)
#7	during layer formation	2015-01-01	layer formation	filling the CarboN-IR cell at -125°C with 55mm of CO2 snow + H2O ice mixture plus some manual surface flattening	flat 55mm thick homogeneous CO2 snow + H2O ice mixture layer over 5mm thick volcanic tuff layer
#8	after layer formation	2015-01-01	pressure	pumping air from the CarboN-IR cell at -125°C	CO2 snow + H2O ice sample in thermodynamical equilibrium with CO2 gas

Comments

some very thin and very fine grained layer of water ice may condense on the sample during closure of the cryogenic cell