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Structural changes of poly(-isopropylacrylamide)-based microgels induced by hydrostatic pressure and temperature studied by small angle neutron scattering
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10.1063/1.3447386
/content/aip/journal/jcp/133/3/10.1063/1.3447386
http://aip.metastore.ingenta.com/content/aip/journal/jcp/133/3/10.1063/1.3447386

Figures

Image of FIG. 1.
FIG. 1.

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 .

Image of FIG. 2.
FIG. 2.

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.

Image of FIG. 3.
FIG. 3.

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).

Image of FIG. 4.
FIG. 4.

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.

Image of FIG. 5.
FIG. 5.

as a function of and for the sample at and .

Image of FIG. 6.
FIG. 6.

Analogy between temperature and hydrostatic pressure: (a) (○) , (◻) ; (b) (○) , (◻) ; (c) (○) , (◻) ; and (d) (○) , (◻) .

Image of FIG. 7.
FIG. 7.

(a) vs hydrostatic pressure. (b) as a function of polymer volume fraction .

Tables

Generic image for table
Table I.

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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/content/aip/journal/jcp/133/3/10.1063/1.3447386
2010-07-15
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Structural changes of poly(N-isopropylacrylamide)-based microgels induced by hydrostatic pressure and temperature studied by small angle neutron scattering
http://aip.metastore.ingenta.com/content/aip/journal/jcp/133/3/10.1063/1.3447386
10.1063/1.3447386
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