Chapter 37 – SANS FROM POLYMER SOLUTIONS
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Chapter 37 – SANS FROM POLYMER SOLUTIONS. 37:9. THE ZERO AVERAGE CONTRAST METHOD. 4 % hPEO/D 2 O. 4 % hPEO/H 2 O. average contrast match line. 50 % dPEO / 50 % hPEO. 17.2 % D 2 O / 82.8 % H 2 O. 63.5 % D 2 O / 66.5 % H 2 O. 4 % dPEO/D 2 O. 4 % dPEO/H 2 O.

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Chapter 37 – SANS FROM POLYMER SOLUTIONS

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Chapter 37 sans from polymer solutions

Chapter 37 – SANS FROM POLYMER SOLUTIONS

37:9. THE ZERO AVERAGE CONTRAST METHOD


Chapter 37 sans from polymer solutions

4 % hPEO/D2O

4 % hPEO/H2O

average contrast

match line

50 % dPEO /

50 % hPEO

17.2 % D2O /

82.8 % H2O

63.5 % D2O /

66.5 % H2O

4 % dPEO/D2O

4 % dPEO/H2O

37:9. THE ZERO AVERAGE CONTRAST METHOD

Recall:


Chapter 37 sans from polymer solutions

COMPARE SANS DATA FROM TWO SAMPLES


Chapter 37 sans from polymer solutions

COMMENTS

-- The zero contrast method consists in mixing deuterated and hydrogenated solvents with deuterated and hydrogenated polymers in order for the contrast factor to be equal to zero.

-- The total polymer volume fraction is kept constant.

-- In the zero contrast method, the cross section is proportional to the single-chain form factor (with no inter-chain contributions).


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