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Zero Contrast Method in Polymer Solutions

Learn about the zero average contrast method for comparing SANS data from two samples. This method involves mixing deuterated and hydrogenated solvents with polymers to achieve a contrast factor of zero. Understand its significance and how it affects the single-chain form factor in polymer solutions.

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Zero Contrast Method in 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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