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Chapter 44 – SANS FROM A PLURONIC

Chapter 44 – SANS FROM A PLURONIC . 44:3. THE CORE-SHELL PARTICLE MODEL. 44:4. CONCENTRATION EFFECTS. 44:5. FIT RESULTS. 44:7. RESULTS FOR THE 10 % P85 IN D2O AT 40 o C. R A. A. R B. B. 44:3. THE CORE-SHELL PARTICLE MODEL. Single-particle:. Spherical Bessel function:.

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Chapter 44 – SANS FROM A PLURONIC

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  1. Chapter 44 – SANS FROM A PLURONIC 44:3. THE CORE-SHELL PARTICLE MODEL 44:4. CONCENTRATION EFFECTS 44:5. FIT RESULTS 44:7. RESULTS FOR THE 10 % P85 IN D2O AT 40 oC

  2. RA A RB B 44:3. THE CORE-SHELL PARTICLE MODEL Single-particle: Spherical Bessel function:

  3. 44:4. CONCENTRATION EFFECTS Structure factor: Hard sphere interactions (Percus-Yevick): Where: Cross section:

  4. 44:5. FIT RESULTS

  5. solvent region C shell region B In the core: 2,392 PO monomers 1,648 EO monomers 1,213 D2O molecules core region A In the shell: 1,462 EO monomers 38,642 D2O molecules = 6.400*10-6 Å-2 = 5.940*10-6 Å-2 = 7.563*10-7 Å-2 RA = 43.96 Å RB = 72.91 Å 44:7. RESULTS FOR THE 10 % P85 IN D2O AT 40 oC

  6. COMMENTS -- P85 Pluronic is formed of a triblock PEO-PPO-PEO. -- P85 Pluronic forms micelles above the Critical Micelle Temperature (CMT). -- Spherical micelles contain PPO core (hydrophobic) and PEO shell (hydrophilic). -- Core-shell form factor and hard-core interaction potential yield model for the cross section. -- Material balance equation gives detailed results about the spherical micelles.

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