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Chapter 37 – SANS FROM POLYMER SOLUTIONS

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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  1. Chapter 37 – SANS FROM POLYMER SOLUTIONS 37:9. THE ZERO AVERAGE CONTRAST METHOD

  2. 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:

  3. COMPARE SANS DATA FROM TWO SAMPLES

  4. 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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