Matter
Name
Mg-exchanged smectite SWa-1 size-fraction <1 µm
Family
Family
mineral
Database
Experimentalists
Parent matter
Ferruginous smectite SWa-1
Origins
natural terrestrial
Provider
Clay Minerals Laboratory, Institute of Geological Sciences, Polish Academy of Sciences
Local reference code
MgSWa1_LSD
Body name
Earth
Preparation
extracted components
Method
Monominerallic sample extracted by removal of carbonates and organics by a sequence of acetic acetate buffer and hydrogen peroxide, followed by washing in deionized water, size separation by centrifugation, ionic exchange by five washings with 0.5 M MgCl2 and subsequent dialysis in deionized water and drying at 60C. Sample was stored at room temperature and relative humidity
Phase type
solid
Component type (group)
mineral (silicate mineral)
Texture
aggregated grains
Type of porosity
particulate
Texture
clay-like
Grain sizes
Grains Size min Size max Size median Size width Size mass fraction Grain shape
#1 1.0 ${\mu}m$ 1.0 $\pm$ 0.05 platy
Size method
size-fraction was separated in a centrifuge (Stoke's Law) but not verified
Number
1
Mode of mixing
single material
Materials
  Name Arrangement Mass (g) Mass fraction Abundance comments
Mg-exchanged smectite SWa-1 size-fraction <1 µm 1.0 $\pm$ 0.01
Title
Purification, size separation, and cation exchange

Precursors

Matters
Materials

Produced matter

Matter
Mg-exchanged smectite SWa-1 size-fraction <1 µm (this matter)
Processing steps
Step Date Type Process Changes
#1 2013-03-01 mechanical Dry sieving at 400µm mesh Removal of coarse fraction (above 0.4 mm
#2 2013-03-01 chemical Reaction of 30 g of a sample with 150 ml of hydrogen peroxide for 30 min at 40C. Repeated 3 times. Removal of organic matter
#3 2013-03-02 chemical Reaction with 200 ml of Na-acetate buffer (ph 4.5 to 5.5) at 90C for 30 min Removal of carbonates
#4 2013-03-04 fluid physical Washing with deionized water Removal of excess adsorbed cations and anions
#5 2013-03-05 mechanical centrifugagion in deionized water Separation of <2 micron fraction according to Stoke's Law
#6 2013-03-06 chemical Reaction with 100 ml of 0.5 M MgCl2 repeated five times Exchange of exchangeable cations for Mg
#7 2013-03-07 fluid physical Dialysis in deionized water. Water was changed until conductivity of water dropped below 1 microsiemens Removal of excess adsorbed cations and anions
#8 2013-03-11 thermal Drying in an oven at 60C Drying of a sample
#9 2013-03-12 mechanical Crushing in an agate mortar Disintegration of a sample in order to create powder
Publications