Radius of pNIPAM-AAc microgels in as a function of (a) temperature and (b) hydrostatic pressure measured by DLS. The particles deswell in both cases with increasing or .
Experimental profiles for four different temperatures and their corresponding fits according to Eq. (8): (◻) and , , , , ; (○) and , , , , ; (△) and , , , , ; and (▽) and , , , , ; The data are vertically shifted by a factor of 10 with increasing temperature.
Experimental profiles for different hydrostatic pressure: (◻) , (◼) , (○) , (●) , (△) , (▲) , (▽) , and (▼) . The data are vertically shifted by a factor of 10 with increasing hydrostatic pressure. The lines represent the expected form factor for hard spheres with radii of (lower line) and (upper line).
Intensity profile for and . The two fits to the data are essentially inappreciable and result in identical values for the parameters shown in Table I.
as a function of and for the sample at and .
Analogy between temperature and hydrostatic pressure: (a) (○) , (◻) ; (b) (○) , (◻) ; (c) (○) , (◻) ; and (d) (○) , (◻) .
(a) vs hydrostatic pressure. (b) as a function of polymer volume fraction .
Values of the free parameters obtained from the fits shown in Fig. 4. is the radius of the core, is the width of the fuzzy region of the particle, , is the particle radius as determined by DLS, is the core polydispersity, is the amplitude of the polymer chain correlations at zero , and is the correlation length or mesh size of the network.
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