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Volume phase transition kinetics of smart N-n-propylacrylamide microgels studied[...]
Figure 9 Pneumatic and hydraulic circuit diagram, showing how the pressure inside[...]
Pressure jump experiments.
Figure 1 Hydrodynamic radius Rh as a function of temperature T for poly(NNPAM) microgel solutions at ambient pressure in H2O and D2O and at 300 bar in D2O.
Particle characterization by PCS, HIM and SANS.
Figure 2 HIM secondary electron image of NNPAM based microgels (a) with the radii distribution (red line) (b), obtained by analyzing the HIM image.
Figure 3 Static SANS data for poly(NNPAM) microgels at ambient pressure and various temperatures.
Figure 4 Static SANS data for poly(NNPAM) microgels at a temperature of T = 22.
Table 1 Parameters obtained from fitting the static SANS scattering curves shown in Fig.
Kinetic measurements via time-resolved small angle neutron scattering.
Figure 5 Time resolved small angle neutron scattering data of the pressure jump experiments done between 40 and 200 bar with a resolution of 5 ms for poly(NNPAM) microgels at 22.
Figure 6 Four typical small angle neutron scattering curves obtained from the pressure jump experiments done between 40 and 200 bar for poly(NNPAM) microgels at 22.
Discussion
Figure 7 Particle radius RSANS and respective pressure p against cycle time t for the pressure jump experiments done between 40 and 200 bar at 22.
Materials and Methods
N-n-propylacrylamide synthesis.
Microgel synthesis.
Small angle neutron scattering experiments.
Figure 8 Technical drawing (left) and photograph (right) of the hollow metal bellow57,58.
Stroboscopic high pressure SANS cell.
Figure 9 Pneumatic and hydraulic circuit diagram, showing how the pressure inside the cell is controlled58.
Pressure jump experiments.
Figure 10 Mechanical cross section (left) and 3D-rendered cross section (right) through the SHP-SANS cell57,58.
Helium Ion Microscopy (HIM).
Figure 11 Cross-section through the high pressure photon correlation spectroscopy setup.
Photon Correlation Spectroscopy (PCS).
Acknowledgements
Aufsatz in einer Zeitschrift
Volume phase transition kinetics of smart N-n-propylacrylamide microgels studied by time-resolved pressure jump small angle neutron scattering
Entstehung
2018
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